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Chemical Engineering Basics MCQ Questions & Answers

Chemical Engineering Basics MCQs : This section focuses on the "Chemical Engineering Basics". These Multiple Choice Questions (MCQs) should be practiced to improve the Chemical Engineering Basics skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

Question 1

The forms in which various metals and non metals occur in nature are called minerals. Which of the following is not a metallic ferrous mineral?

A. Cassiterite
B. Sphalerite
C. Chalcopyrite
D. Calcite

Question 2

Unit of viscosity in CGS system is

A. Gm .cm⁻¹ sec⁻¹
B. Gm . cm² . sec⁻²
C. Gm .cm⁻², sec⁻¹
D. Gm . cm . sec⁻¹

Question 3

In case of water (Prandtl number ≈ 6) flowing over a flat plate heated over the entire length, the thermal boundary layer thickness as compared to hydrodynamic boundary layer thickness is

A. Less
B. More
C. Equal
D. Unpredictable

Question 4

Transformation range for ferrous material is the temperature interval during which __________ is formed during its heating.

A. cementite
B. austenite
C. martensite
D. pearlite

Question 5

Pick the odd man out.

A. Austempering
B. Martempering
C. Cyniding
D. Parkerizing

Question 6

Galvanic corrosion

A. Occurs in a bimetal couple
B. Occurs in highly stressed metallic parts only
C. Is exemplified by caustic embrittlement of boiler tubes
D. Is also called dezincification

Question 7

For a thermodynamic system undergoing a process, which of the following pairs best expresses the relationship similar to that expressed by the pressure volume plot ?

A. Temperature - entropy
B. Temperature - pressure
C. Enthalpy - entropy
D. Enthalpy-pressure

Question 8

Improvement in mechanical properties of metals in its hot working is due to the grains

A. Recrystallisation
B. Refinement
C. Growth
D. Recovery

Question 9

Hydrocyclone is a

A. Crusher
B. Wet classifier
C. Dry classifier
D. Magnetic separator

Question 10

Spark plug is provided in a/an

A. Engine having carburettor
B. Diesel engine
C. Compression ignition engine
D. Both(b) & (c)

Question 11

Device used as a standard for the calibration of pressure gauges is a

A. Bellow
B. Diaphragm
C. Dead weight pressure tester
D. Mercury manometer

Question 12

Alloys having more than 80% copper are generally more

A. Abrasion resistant
B. Corrosion resistant
C. Prone to season cracking
D. Machinable

Question 13

Stainless steel is welded using

A. Oxy-acetylene flame
B. Oxy-hydrogen flame
C. Arc welding
D. Inert gas arc welding

Question 14

Dry saturated steam can be converted into superheated steam by

A. Increasing its cross-sectional area of flow
B. Passing it through a pressure reducing valve
C. Forcing it downwards through a vertical tube
D. None of these

Question 15

The __________ of a double acting reciprocating pump as compared to the single acting pump will be almost double.

A. Flow output
B. Head developed
C. Overall efficiency
D. Weight

Question 16

Which of the following is termed as the boiler mounting ?

A. Superheater
B. Economiser
C. Blow off cock
D. Feed pump

Question 17

Electrolytes conduct electric current by

A. The movement of ions
B. The movement of molecules
C. Allowing electrons to flow through them from cathode to anode
D. Movement of electric charge through them

Question 18

Draught produced by a tall chimney due to density difference between hot flue gas inside the Chimney and atmospheric air outside the chimney is more appropriately known as the __________ draught.

A. Natural
B. Induced
C. Forced
D. Chimney

Question 19

If a nuclear reactor produces more fissile nuclear fuel than it consumes, then it is called a __________ reactor.

A. critical
B. breeder
C. fertile
D. heterogenous

Question 20

Lead is poured into the joint between two- __________ pipes.

A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement

Question 21

The weight of a body at the centre of the earth is

A. Infinite
B. Zero
C. Same as on the surface of the earth
D. None of these

Question 22

The most important consideration in value engineering is the

A. Profit maximisation
B. Customer satisfaction
C. Cost reduction
D. Process improvement

Question 23

The efficiency of a Carnot heat engine operating between absolute temperatures T₁ and T₂ (when, T₁ > T₂) is given by (T₁ - T₂)/T₁. The co-efficient of performance (CO.P.) of a Carnot heat pump operating between T₁ and T₂ is given by

A. T₁/(T₁-T₂)
B. T₂/(T₁-T₂)
C. T₁/T₂
D. T₂/T₁

Question 24

Which of the following is an inedible oil ?

A. Corn oil
B. Tallow oil
C. Olive oil
D. Cotton seed oil

Question 25

Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.

A. Joule
B. Carnot
C. Rankine
D. Brayton

Question 26

Primary designation of steel is based on its

A. Hardness & tensile strength
B. Carbon content
C. Iron content
D. Alloying elements content

Question 27

Surface tension of a liquid

A. Is due to intermolecular forces of cohesion
B. Decreases with rise in temperature
C. Is responsible for the spherical shape of an isolated liquid drop
D. All of the above

Question 28

Brinell Hardness Number (BHN) for talc is approximately in the range of

A. 1-5
B. 20-30
C. 100-150
D. 200-250

Question 29

Earing is a defect found in steels after the following metal working operation (s).

A. Deep drawing
B. Rolling
C. Extrusion
D. Wire drawing

Question 30

Normal dosage of chlorine in public water supply scheme ranges from __________ ppm.

A. 0.5 to 1
B. 10 to 15
C. 300 to 500
D. 1000 to 1500

Question 31

Wrought iron is not

A. Uctile & resistant to corrosion/rusting
B. Weldable easily
C. Having uniform strength in all directions
D. Having maximum tensile strength along the lines of slag distribution

Question 32

Out of the following, maximum temperature drop for a given heat flow & for the same thickness will be in the case of

A. Steel
B. Glass wood
C. Copper
D. Fireclay bricks

Question 33

The magnitude of water hammer caused in pipe flow is independent of the

A. Pipe length
B. Fluid flow stoppage rate
C. Fluid temperature
D. Time of valve closure

Question 34

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A. Compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller
B. Maintaining vacuum on tube side is more difficult than that on the shell side
C. Water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam
D. Condenser can act as a storage unit for condensed steam

Question 35

Sulphur is melted in the sulphuric acid plant most commonly by employing

A. Electrical heater
B. Steam heater
C. Direct fuel oil fired heater
D. Gas fired furnace

Question 36

Springs are not made of

A. Phospher bronze
B. Nickel steel
C. Monel
D. Carbon steel (c ≤ 0.5%)

Question 37

Which of the following low melting alloy containing bismuth and lead is used for electric fuse ?

A. Wood's metal
B. Babbit metal
C. Monel metal
D. Duralumin

Question 38

Which of the following pairs is not correctly matched?

A. Uranium - 233 : Fertile material
B. Bindingenergy : Mass defect
C. Scattering : Absorption cross-section
D. Number of nucleons : Mass number

Question 39

Hardness & tensile strength of austenitic stainless steel can be increased by

A. Martempering
B. Cold working
C. Normalising
D. Hardening

Question 40

The type of water filter normally employed/ preferred for treating small quantities of water in railway stations and individual industries is the __________ filter.

A. Rapid sand
B. Pressure
C. Gravity
D. Slow sand

Question 41

Pick out the wrong statement

A. Processing of themosetting plastics is ideally done by injection moulding
B. Processing of thermoplastics is ideally done by compression moulding
C. Mass production of seamless pipes are done by electrical resistance welding (ERW)
D. Stretch forming is a process of cold drawing

Question 42

Metalloids

A. Are good conductor of heat & electricity
B. Act as electron donors with metals & as electron acceptor with non-metals
C. Are not necessarily solids at room temperature
D. Are compounds that exhibit both metallic & non-metallic properties to some extent and are exemplified by elements like germanium, silicon & boron

Question 43

A polymer is termed as an 'elastomer', if its percentage elongation is more than 100%. An elastomer is termed as 'rubber' if its percentage elongation is more than __________ percent.

A. 150
B. 200
C. 300
D. 400

Question 44

Hydrogen in liquid steels is dissolved

A. As tiny gas bubbles
B. In the atomic form
C. In the ionic form
D. In the molecular form

Question 45

Melting point & boiling points of liquid oxygen are respectively - 218.8°C & - 183°C, while the same for liquid nitrogen is - 210°C & - 195.8°C respectively. The difference in melting points of liquid oxygen & liquid nitrogen is not equal to 8.8

A. °C
B. °F
C. °K
D. °R

Question 46

Cast iron has the unique property of high

A. Ductility
B. Damping characteristics
C. Hardness
D. Malleability

Question 47

Two stroke engine compared to a four stroke engine has

A. Higher efficiency
B. Less fuel consumption
C. Higher power to weight ratio
D. Lower initial cost

Question 48

Lead percentage in pure galena is about

A. 8.6
B. 86.6
C. 35.8
D. 61.4

Question 49

Which of the following has the highest modulus of elasticity (about 7 x 10⁶ kg/cm²) ?

A. High speed steel
B. Stainless steel
C. Tungsten carbide
D. Superalloys

Question 50

Materials having __________ lattice structure are usually the most ductile.

A. Body centred cubic (bcc)
B. Hexagonal close packed (hcp)
C. Face centred cubic (fcc)
D. None of these

Question 51

Out of the following, the best material capable of withstanding shock & vibration without the danger of cracking is

A. Malleable iron
B. Grey cast iron
C. Chilled cast iron
D. White cast iron

Question 52

Fibrous fracture is normally encountered in the __________ materials.

A. Hard
B. Elastic
C. Ductile
D. Brittle

Question 53

Material of construction of foundary crucible is

A. Lead
B. Stainless steel
C. Graphite
D. Cast iron

Question 54

Window panes of aeroplanes are normally made of

A. Perspex (PMMA)
B. Teflon (PTFE)
C. Bakelite (phenol formaldehyde)
D. Polystyrene

Question 55

Material having negative co-efficient of linear expansion is

A. Copper
B. Aluminium
C. Rubber
D. Nickel

Question 56

Thermal shock produced by cooling is more dengerous/deleterious than that produced by heating a surface, because of the reason that

A. Cooling produces tension on the surface
B. Cooling produces compression on the surface
C. Heating does not produces any thermal stress
D. Heating produces compression on the surface

Question 57

Encyclopaedia of Chemical Technology has been

A. Authored by Kirk Othmer
B. Edited by Perry and Chilton
C. Edited by Kirk Othmer
D. Authored by Perry and Chilton

Question 58

If Reynolds number is greater than 1, then the

A. Viscous force is larger than the inertia force
B. Inertia force is larger than the viscous force
C. Inertia force is larger than the surface tension force
D. Inertia force is larger than the gravitational force

Question 59

Which of the following varies as the square root of oil pressure during atomisation of fuel oil through a pressure jet burner?

A. Output & fineness
B. Velocity
C. Both A & B
D. None of these

Question 60

Milk is fat dispersed in water. It is an example of

A. Suspension
B. Emulsion
C. Gel
D. Solution

Question 61

Surface finish of casting does not depend upon the

A. Sand fineness
B. Pattern finish
C. Mould dressings
D. Metal temperature

Question 62

The mechanism which changes the value of manipulated variable in response to the output signal from the control unit is called the

A. Final control element
B. On-off control
C. Floating control action
D. None of these

Question 63

Regeneration of molecular seive requires it to be heated to a temperature of about __________ °C.

A. 80-120
B. 200-300
C. 600-800
D. 1000-1100

Question 64

Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.

A. 300
B. 800
C. 1400
D. 2000

Question 65

Main constituent of bone ash is

A. Ammonium phosphate
B. Calcium phosphate
C. Animal charcoal
D. Ammonium sulphate

Question 66

Shrinkage allowance on pattern is provided to compensate for shrinkage when the

A. Metal changes from liquid state to solid state at freezing temperature
B. Solid phase temperature drops from freezing temperature to the room temperature
C. Liquid metal temperature drops from pouring temperature to room temperature
D. Liquid metal temperature drops from pouring temperature to freezing temperature

Question 67

An alloy of Fe - 0.4 % C is

A. Cast iron
B. Hypo-eutectoid steel
C. Hyper-eutectoid steel
D. Eutectoid steel

Question 68

In the formation of cermets, the ratio of ceramic material to metallic material is usually 80:20. Which of the following is a cermet?

A. Zirconia
B. Alumina
C. Bakelite
D. Tungsten carbide

Question 69

Laser is a device to produce

A. Gamma rays
B. Microwaves
C. A beam of white light
D. A beam of coherent light

Question 70

Co-efficient of performance of a Carnot cycle refrigerator operating between - 23°C and + 27°C is

A. 3
B. 5
C. 0.5
D. 1.5

Question 71

The moment of inertia of a body comes into play in __________ motion.

A. Curvilinear
B. Linear
C. Rotational
D. None of these

Question 72

Hydrogen can be

A. Used in I.C. engines as fuel
B. Liquefied & stored under cryogenic conditions
C. Produced by electrolysis of water
D. All of the above

Question 73

Bad odour in sanitary latrines is reduced by periodically sprinkling

A. Bleaching powder
B. Lime powder
C. Aluminium sulphate
D. None of these

Question 74

Deformation band is absent in materials having __________ lattice crystal structure.

A. Fcc
B. Bcc
C. Hcp
D. None of these

Question 75

__________ joint is usually used for joining cast iron pipes mostly used for temporary pipelines, where it may be necessary to dismantle & reassemble the pipeline very frequently.

A. Collar
B. Flanged
C. Bell and Spigot
D. Expansion

Question 76

Rankine cycle comprises of two isothermal and two __________ processes.

A. Isobaric
B. Polytropic
C. Isentropic
D. None of these

Question 77

The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe)

A. A
B. D
C. 1/A
D. 1/A²

Question 78

Which of the following is not a cupro-nick-el alloy?

A. German silver
B. Monel metal
C. Muntz metal
D. None of these

Question 79

Fire in fuel gas pipelines is extinguished most effectively by

A. Spraying water
B. Blanketting the area with nitrogen atmosphere
C. Fire fighting foam
D. None of these

Question 80

Out of the following, __________ waves have the largest wavelength.

A. Radio
B. Light
C. X-ray
D. Gamma-ray

Question 81

Nuclear fission of one atom of uranium⁻²35 produces the energy equivalent to about __________ MeV.

A. 20
B. 200
C. 500
D. 1000

Question 82

Resilience of a bolt can be increased by increasing its

A. Length
B. Shank diameter
C. Head diameter
D. None of these

Question 83

Probability of cavitation occuring becomes very high, when the local __________ resulting in water bubbles formation, which on rupture cause cavitation

A. Pressure falls below the vapour pressure
B. Pressure becomes very high
C. Temperature becomes low
D. All of the above

Question 84

A material expanding freely due to heating will develop __________ stress.

A. No
B. Compressive
C. Tensile
D. Thermal

Question 85

Pick out the correct statement about the condensation.

A. Filmwise condensation gives a lower heat transfer rate than the dropwise condensation
B. Suitable coating or vapour additive is used to promote film wise condensation
C. If a condensing liquid does not wet the surface dropwise, even then condensation will take place on it
D. Reynolds number of condensing liquid is based on its mass flow rate

Question 86

Hot extrusion process is not used for making

A. Cast iron pipe for domestic water supply
B. Aluminium curtain rods
C. Stainless steel tubes used in furnitures
D. Any of these

Question 87

Consider an ideal solution of components A and B. The entropy of mixing per mole of an alloy containing 50 wt% B is

A. R ln 2
B. -R ln 2
C. 3 R ln 2
D. -3R ln 2

Question 88

Which of the following mainly decides the current to be employed is arc welding?

A. Electrode size
B. Plate thickness
C. Voltage across the arc
D. Welded portion length

Question 89

Maxwell's thermodynamic relations applies to the

A. Chemical systems in equilibrium
B. Mechanical systems in equilibrium
C. Irreversible thermodynamic processes
D. Reversible thermodynamic processes

Question 90

Most of the phosphorous present in the blast furnace burden enters into

A. Hot metal
B. Flue gases
C. Slag
D. Refractory lining

Question 91

Machinability of hard alloys and tool steels is improved by

A. spherodising
B. annealing
C. tempering
D. normalising

Question 92

Catalyst used in the 'catalytic converter' employed in automobile exhaust line for complete combustion/oxidation of carbon monoxide, nitrogen oxides and hydrocarbons is

A. Alumina
B. Platinum
C. Vanadium pentoxide
D. Iron oxide

Question 93

Which of the following is prone to cup and cone fracture?

A. Cast iron
B. Soft brass
C. Round specimen of ductile metal
D. Flat tensile specimen of ductile metal

Question 94

Austempering of steel requires.it to be heated to 875°C followed by sudden cooling to 250-525°C, thereby changing austenite to

A. Sorbite
B. Bainite
C. Martensite
D. Troostite

Question 95

Difference at any instant between the value of the controlled variable and the set point is called the

A. Deviation
B. Derivative time
C. Error ratio
D. Differential gap

Question 96

Percentage of differential pressure lost in a venturimeter with a tapering of 15° may be about

A. 1
B. 10
C. 25
D. 50

Question 97

Which of the following is an example of cathodic protection of metals against corrosion ?

A. Painted steel
B. Galvanised iron
C. Case hardened steel
D. Lead lined reactor

Question 98

Heat transfer by radiation from a hot body will be most rapid, if its surface is __________ because of its higher emissivity.

A. White & rough
B. Black & rough
C. White & polished
D. Black & polished

Question 99

Maximum hardenability of steel depends upon its

A. Chemical composition
B. Carbon content
C. Grain size
D. Alloying elements content

Question 100

Which one can be directly solidified from gaseous state wihtout entering into liquid state?

A. Helium
B. Oxygen
C. Carbon dioxide
D. None of these

Question 101

__________ welding will be the most suitable for butt welding two 20 cms thick boiler drum mild steel plates.

A. Electrical resistance
B. Electroslag
C. Plasma torch
D. Submerged arc

Question 102

The most important consideration, while designing the refrigeration system of an aircraft is that the refrigeration system

A. Is as light as possible
B. Has very high C.O.P
C. Employs minimum quantity of refrigerant
D. Consumer minimum horse power

Question 103

All the atoms of the world comprise of electrons, proton & neutron except that of __________ atom in which neutron is absent.

A. Deuterium
B. Hydrogen
C. Neon
D. Helium

Question 104

The activity co-efficient of the solute in a dilute solution

A. Decreases with the increase of concentration of the solute
B. Increases with the increase of concentration of the solute
C. Remains constant
D. Is unity at infinite dilution

Question 105

Pick out the wrong statement.

A. Lead can creep under its own weight at room temperature
B. The electrical conductivity of gold is considerably reduced by alloying additions due to the decrease in electron movement
C. Recrystallisation temperature decreases with decrease in strain in a cold worked metal
D. With increase in temperature, the electrical conductivity of intrinsic semi-conductor will increase

Question 106

Normalising does not __________ of a metal.

A. Improve machinability & tensile strength
B. Remove internal stresses
C. Refine the structure
D. Remove strains caused by cold working

Question 107

Which of the following is resistant to the action of both heat & chemicals?

A. Boro silicate glass
B. Silica glass
C. Soda lime glass
D. None of these

Question 108

The cost of providing service in a queing system decreases with the

A. Increased mean time in the queue
B. Increased arrival rate
C. Decreased mean time in the queue
D. Decreased arrival rate

Question 109

Water flow in the river during flood can be categorised as the __________ flow.

A. Unsteady uniform
B. Unsteady non-uniform
C. Steady uniform
D. Steady non-uniform

Question 110

__________ flux is used for the extraction of metal from its self fluxing ores.

A. No
B. Acid
C. Basic
D. Neutral

Question 111

Wood is a/an __________ material.

A. Amorphous
B. Cellular
C. Homogeneous
D. Grannular

Question 112

In case of compression of one kg of air, the work done will be the least, when the value of polytropic index 'n' is

A. 1
B. 1.4
C. 1.5
D. Y = Cp/Cv

Question 113

Corrosion is

A. A physical phenomenon
B. A chemical phenomenon
C. Same as erosion
D. An uncontrollable phenomenon

Question 114

Castability of aluminium is increased by the addition of __________ in it.

A. Silicon
B. Manganese
C. Bismuth
D. Lead

Question 115

Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)

A. A
B. L
C. A²
D. Both A & B

Question 116

A compact estimate about the amount of materials handling between various work stations is obtained from the

A. Gantt chart
B. Bin chart
C. String diagram
D. Travel chart

Question 117

Three elastic constants for a completely anisotropic elastic material which follows the Hooke's law are young's modulus, elastic limit stress and yield stress. Which of the following properties is most sensitive to increase in strain rate ?

A. Tensile strength
B. Elastic limit
C. Proportional limit
D. Yield strength

Question 118

Which of the following equipments is used for liquid dispersion?

A. Packed column
B. Venturi scrubber
C. Bubble cap plate column
D. Wetted wall column

Question 119

Pick out the wrong statement.

A. A soft magnetic material should have high permeability and small area of hysterisis loop
B. Poisson's ratio of high melting point metals is more than unity
C. Solders generally melt at less than 185°C
D. Steel produced by B.O.F process is ideally suited for manufacturing flat product

Question 120

Fine grained steels have

A. High brittleness
B. Higher tendency to distort
C. High ductility
D. None of these

Question 121

Flare tower' used in industry is meant for

A. Venting off (after burning) the excess inflammable/toxic gases at high pressure
B. Absorbing the pollutant gases from the furnace exhaust
C. Cooling of furnace exhaust gases
D. None of these

Question 122

Ester is formed, when an alcohol reacts with

A. Carboxylic acid
B. Aldehyde
C. Ketone
D. Ether

Question 123

Flywheel is provided in a machine to

A. Provide structural strength to the shaft
B. Smoothen the power impluses
C. Help in quick starting of the machine
D. None of these

Question 124

__________ wire is never used for making the heating element.

A. Nichrome
B. Kanthal
C. Invar
D. None of these

Question 125

Swaging is a/an __________ operation.

A. Piercing
B. Forging
C. Extrusion
D. Drawing

Question 126

End cooler' or 'after cooler' is employed in air compressor mainly to

A. Remove oil vapour or moisture from air
B. Cool the dry air before use
C. Reduce the volumetric capacity of receiver
D. None of these

Question 127

Which of the following is an ore dressing operation?

A. Classification
B. Smelting
C. Roasting
D. None of these

Question 128

Which of the following metals can not be extracted by pyrometallurgical process from its sulphide ore?

A. Copper
B. Mercury
C. Lead
D. None of these

Question 129

Catalyst used in the catalytic converter employed in automobiles to convert CO into CO and for complete oxidation of un-burnt hydrocarbons is

A. Nickel
B. Cobalt
C. Vanadium
D. Platinum

Question 130

The same volume of all gases is representative of their

A. Specific gravities
B. Densities
C. Gas characteristic constants
D. Molecular weights

Question 131

For which pair of the fuel gases, calorific value (C.V.) of one fuel is almost double that of the other on volume basis (i.e., kcal/Nm³) while the C.V. is same on weight basis (i.e., kcal/kg) ?

A. Propane and acetylene
B. Propane and LPG
C. Sewage gas and gobar gas
D. B.F gas and coke oven gas

Question 132

Which is the only metal that exists in liquid state at room temperature?

A. Sodium
B. Mercury
C. Lithium
D. Strontium

Question 133

Wavelength of radiation emitted by a body depends on the __________ of its surface.

A. Temperature
B. Area
C. Nature
D. All of the above

Question 134

Which one of the following is incombustible ?

A. H₂
B. CCl₄
C. C₂H₂
D. S

Question 135

Coke is added in the blast furnace to

A. Reduce & melt the iron ore
B. Increase the fluidity of slag
C. Remove sulphur & phosphorus from molten metal
D. None of these

Question 136

Nitrogen compounds are not used in the manufacture of

A. Fertilisers
B. Gun powder
C. Tip of match sticks
D. Explosive

Question 137

When the wavelength of incident X-rays increases, the angle of diffraction

A. Decreases
B. Increases
C. Remains constant
D. Shows no systematic variation

Question 138

Pick out the wrong statement.

A. For a pressure vessel to be classified as 'thin vessel', the ratio of wall thickness to mean radius is less than 0.1
B. For calculating forces and efficiency of rivetted joint, either rivet diameter or rivet hole diameter is used in case of pressure vessel and in structural work
C. Longitudinal joint is normally made butt joint to maintain the circularity of the vessel
D. Maximum diameter of the opening provided in a pressure vessel, which does not require any compensation is 200 mm

Question 139

Endurance is a measure of fatigue limit of a metal. Fatigue crack in nitrided machine parts originates

A. At the surface
B. Within the core
C. Just below the surface
D. Anywhere on the surface

Question 140

Electrometallurgy is not involved in the extraction of __________ from its ore.

A. Aluminium
B. Tin
C. Lead
D. Both B & C

Question 141

Current asset of a factory includes the

A. Goodwill of the company
B. Common stocks held by the company
C. Manufacturing plant & equipment
D. Inventory

Question 142

Factor of safety is the ratio of the __________ stress to the working stress.

A. Tensile
B. Compressive
C. Yield
D. Bearing

Question 143

Hollow shafts can be made as strong as solid shafts by making the twisting moments of both the shafts same. Shafts made by __________ have residual stresses.

A. Forging
B. Cold rolling
C. Hot rolling
D. Casting

Question 144

The refractory lining of the bottom in a basic electric arc furnace is made of

A. Silica
B. Alumina
C. Magnesia
D. Fireclay

Question 145

Minimum number of members required to form a Public Limited Joint Stock Company is

A. 7
B. 10
C. 12
D. 17

Question 146

In BOF, desiliconisation is a first order reaction. So the silicon content of the metal decreases

A. Linearly with time
B. Exponentially with time
C. Logarithmically with time
D. In proportion to the square root of time

Question 147

Out of the following, the joint produced by __________ has the lowest strength.

A. Soldering
B. Welding
C. Brazing
D. Rivetting

Question 148

Pick out the wrong statement.

A. Annealing twins are not observed in pure aluminium, because it has higher strain energy
B. Load during cold rolling can be lowered by the application of front tension
C. Very fine grain structure is desirable for high temperature creep application of materials
D. Soft magnetic materials are those which have less area within the hysterisis loop

Question 149

Cascade control is

A. The continuous adjustment of the set point index of an automatic control loop by a primary (master) controller
B. Used when changes in process conditions cause serious upsets in the controlled variable
C. Useful to control flow from temperature
D. All of the above

Question 150

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number.
B. Grashoff number & Reynolds number.
C. Reynolds number.
D. Grashoff number & Prandtl number.

Question 151

Ice point' is designated on Farenhite temperature scale by

A. 0°
B. 32°
C. 62°
D. 212°

Question 152

The conventional mechnical transducer, which converts pressure signal to displacement signal is

A. Spring
B. Manometer
C. Strain gauge
D. None of these

Question 153

Wrought iron is never shaped by

A. casting
B. cold working
C. forging
D. welding

Question 154

In a titration involving weak acid and strong base, the preferred indicator is

A. Methyl orange
B. Phenolphthalein
C. Ethyl orange
D. Fehling's solution

Question 155

Rate of chemical reaction is not much affected, if the reactants are in __________ form.

A. Solids
B. Liquids
C. Either A or B
D. Gaseous

Question 156

Transformer cores are normally made from

A. Soft ferrites
B. High purity iron
C. Grain oriented Fe-Si alloy
D. Al-Ni-Co alloy

Question 157

Basic open hearth furnace (BOF) is not used for producing __________ steel.

A. Killed
B. Rimming
C. High alloy
D. None of these

Question 158

Ferrites are __________ magnetic.

A. Anti
B. Para
C. Ferri
D. Ferro

Question 159

Galena is an ore of

A. Iron
B. Copper
C. Lead
D. Aluminium

Question 160

Coating provided on the electrodes used in the arc welding is not expected to

A. Add alloying elements
B. Prevent electrode from contamination
C. Stabilise the arc
D. Provide protective atmosphere to weld

Question 161

Which of the following approaches the ideal gas behaviour most closely?

A. Wet steam
B. Saturated steam
C. Superheated steam
D. Saturated water

Question 162

In case of brasses, with decreasing zinc percentage and increasing copper percentage, its __________ increases.

A. Percentage elongation
B. Brinell hardness
C. Tensile strength
D. All of the above

Question 163

Milligram of KOH required to saponify 1 gm of oil is called its __________ number.

A. Saponification
B. Acid
C. Precipitation
D. Emulsion

Question 164

Pearlite comprises of

A. 87% cementite & 13% Fe
B. 87% ferrite & 13% cementite
C. 93.33% ferrite & 6.67% C
D. 87% ferrite & 13% C

Question 165

Which of the following metals reacts violently with water ?

A. Mercury
B. Sodium
C. Calcium
D. Magnesium

Question 166

The 'transition temperature' for ductile to brittle behaviour of steel increases with increase in the __________ content in steel.

A. Carbon
B. Manganese
C. Both A & B
D. Neither A nor B

Question 167

The order of a chemical reaction

A. Can be determined only experimentally
B. Can be determined from the stoichiometry of the reaction
C. Can not be zero
D. Can be fractional

Question 168

Filler material used in welding should have __________ as compared to the parent metal to be welded.

A. Lower melting temperature
B. Same melting temperature
C. Same composition
D. Both B & C

Question 169

Lead pencil contains

A. Graphite
B. Lead sulphide
C. Lead
D. Both B & C

Question 170

Fatigue strength of a material can not be increased by

A. Cold working
B. Hot working
C. Shot peening
D. Any of these

Question 171

Chromium molybdenum steel can not be welded using __________ welding.

A. thermit
B. electrical resistance
C. oxy-acetylene
D. any of these

Question 172

Addition of __________ to steel does not help in improving its machinability.

A. Sulphur
B. Silicon
C. Lead
D. Phosphorous

Question 173

Heat required to raise the temperature of a body by 1 °C is called its

A. Heat capacity
B. Specific heat capacity
C. Thermal conductivity
D. Water equivalent

Question 174

A jig is used while __________ a hole.

A. Boring
B. Counter boring
C. Drilling
D. Enlarging

Question 175

Addition of silicon to aluminium improves its

A. Corrosion resistance
B. Machinability
C. Castability
D. None of these

Question 176

The bank of tubes located at the back of the domestic refrigerators are the __________ tubes.

A. Refrigerant cooling
B. Evaporator
C. Condenser
D. Throttling

Question 177

A hot short metal is

A. Hard when hot
B. Brittle when cold
C. Brittle when hot
D. Brittle under all conditions

Question 178

While the recrystallisation temperature for pure metals is 0.3 Tm, the same for alloys is equal to __________ x Tm (where, Tm Melting temperature).

A. 0.25
B. 0.45
C. 0.7
D. 0.95

Question 179

Pick out the correct statement.

A. Hot worked materials are subjected to annealing to remove internal stresses
B. Annealing of steel hardens it slightly
C. Normalising of a material induces stresses
D. Tempering of a material improves ductility & toughness but reducess hardness & brittlenes

Question 180

Oxygen cylinders used for autogenous (cutting/welding) purposes are

A. Seamless & made of steel
B. Heat treated before use
C. Made by sand casting
D. Welded steel cylinders

Question 181

Which of the following materials has the maximum shrinkage allowance ?

A. Brass
B. Cast iron
C. Lead
D. Aluminium alloy

Question 182

The dimensions of Planck's constant is the same as that of the

A. Kinetic energy
B. Momentum
C. Electrostatic potential
D. None of these

Question 183

RADAR is

A. Acronym for Radio Detection and Ranging
B. Name of technique for locating distant objects
C. Name of instrument for locating distant objects
D. All of the above

Question 184

Out of the following __________ iron has the best capability to bear sudden & excessive shocks.

A. White
B. Cast
C. Wrought
D. Pig

Question 185

Magnetic permeability of iron is increased by its

A. Decarburising
B. Alloying with cobalt
C. Purification
D. Alternate heating & cooling

Question 186

Which of the following exemplifies resemblence with the extrusion process ?

A. Pneumatic ejection of abrasive solid particles through a nozzle
B. Toothpaste pouring out of the tube
C. Ejection of abrasive slurry through an opening
D. Viscous lubricant pouring out through its container's mouth

Question 187

Which of the following is a permanent fastening?

A. Rivets
B. Bolts
C. Screws
D. Keys

Question 188

Wrought iron does not have the

A. Uniform strength in all directions
B. Ability to hold protective coating
C. High ductility & corrosion resistance
D. Easily weldable characteristics

Question 189

Circulation of liquid metal (i.e. molten sodium) in a liquid metal cooled nuclear reactor is done by a/an __________ pump.

A. Electromagnetic
B. Axial flow
C. Diaphragm
D. Reciprocating

Question 190

A metalloid possesses the characteristics of both the metals and non-metals. Which of the following is not a metalloid?

A. Arsenic
B. Antimony
C. Lead
D. None of these

Question 191

The noble metals

A. Are exemplified by Na, K and Li
B. Do not resist corrosion very strongly
C. Are the lowermost in the electro-chemical series of metals
D. None of these

Question 192

Working of linear variable differential transducer (LVDT) is based on the principle of variable

A. Capacitance
B. Resistance
C. Mutual inductance
D. None of these

Question 193

A 2 kg object weighs 1.8 kgf on a spring balance. The value of 'g' at that location in m/seC₂ is

A. 8.82
B. 9.81
C. 10.88
D. 0.95

Question 194

Colour comparator is used to measure the

A. PH value
B. Electrode potential
C. Colour intensity
D. None of these

Question 195

Normalising of a casting does not

A. Induce stresses in it
B. Refine its grain structure
C. Reduce seggregation
D. Improve its mechanical properties

Question 196

Damage to metal surface by mechanical action is called

A. Pitting
B. Corrosion
C. Erosion
D. None of these

Question 197

Which of the following is not an ore of aluminium?

A. Troosite
B. Kaolin
C. Alunite
D. Cryolite

Question 198

Out of the following, the highest emf for a given temperature is generated by the __________ thermocouple.

A. Chromel - alumel
B. Iron - constantan
C. Platinum - platinum + rhodium
D. Copper-constantan

Question 199

Air/fuel ratio on molar (volume) basis for combustion of methane with theoretical quantity of air with be

A. 9.5:1
B. 12.5:1
C. 15.5 :1
D. 18.5 : 1

Question 200

Which of the following is not a ferromagnetic material?

A. Nickel
B. Cobalt
C. Aluminium
D. Iron

Question 201

The passage between the nozzle and the __________ is called 'sprue' in case of injection moulding.

A. Runner
B. Cylinder
C. Mold
D. None of these

Question 202

The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.

A. 768
B. 1127
C. 1359
D. 1480

Question 203

Metal cutting by oxy-acetylene flame is accomplished by the __________ of the metal.

A. Burning
B. Intensive oxidation
C. Evaporation
D. None of these

Question 204

Dielectric

A. Is an electrical insulating material
B. Of low resistivity is preferred
C. Should have high thermal conductivity
D. Need not defy the corrosive action of chemicals

Question 205

Diffusion co-efficient of a metal in a solid solution depends upon its

A. Composition
B. Temperature
C. Both A & B
D. Neither A nor B

Question 206

First empirical temperature scale conceived is the __________ temperature scale.

A. Absolute
B. Reaumer
C. Farenhite
D. Celcius

Question 207

Minimum thermal efficiency of a steam boiler may be around __________ percent

A. 25
B. 45
C. 65
D. 20

Question 208

Lead is poured into the joints between two __________ pipes.

A. Cast iron
B. Steel
C. Concrete
D. Plastic

Question 209

The preferred alloying element for low temperature applications of steel is

A. Cr
B. N
C. Mo
D. Ni

Question 210

A jet engine turbine blade is normally manufactured by

A. Forging
B. Shell moulding
C. Investment casting
D. Pressure die casting

Question 211

With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.

A. Supercharging
B. Wall temperature
C. Compression ratio
D. Engine speed

Question 212

Pick out the wrong statement.

A. Seam welding, projection welding & spot welding are the classification of electrical resistance welding
B. Electrode tip in spot welding is of copper and the tip diameter should be equal to t (where, t = plate thickness to be welded)
C. In spot welding, two pieces to be joined are overlapped and placed between two electrodes
D. Mild steel sheet can not be spot welded

Question 213

Blast furnace is a

A. Counter current reactor
B. Co-current reactor
C. Cross-current reactor
D. Combination of all the three

Question 214

Preheating prior to welding is done for the purpose of

A. Decreasing cooling rate
B. Facilitating fusion of high melting metals
C. Preventing hot cracking
D. Ensuring full penetration

Question 215

In connection with corrosion of metals, passivation is the process that

A. Intensifies deterioration
B. Changes the composition of the metal
C. Inhibits further deterioration
D. None of these

Question 216

In case of simple harmonic motion, displacement is proportional to the

A. Velocity
B. Acceleration
C. Both A & B
D. Neither A nor B

Question 217

The behaviour of a metal specimen, which when plastically strained in tension reduces its yield stress in compression and vice versa; is termed as the

A. Work hardening
B. Bauschinger effect
C. Creeping effect
D. Stress recovery effect

Question 218

A machine having assumed life of 20 years is purchased for Rs 32000/-. Its scrap value at the end of its life is Rs 8000/-. If the depreciation is calculated by diminishing balance method, then percentage reduction in its value at the end of first year is __________ percent.

A. 6.7
B. 7.6
C. 10.3
D. 15.2

Question 219

The product of a commercial direct reduction process is

A. Liquid iron
B. Solid iron
C. Sponge iron
D. Iron saturated with carbon

Question 220

__________ can replace tungsten in high speed steel.

A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum

Question 221

Puddling process is used for converting pig iron into

A. Cast iron
B. Wrought iron
C. Mild steel
D. Semi-steel

Question 222

Depreciation of machines fails under the indirect expenses head. As per income tax regulations, it is calculated by the __________ method.

A. Diminishing balance
B. Sinking fund
C. Multiple straight line
D. Sum of the years digit

Question 223

The delivery pressure of boiler feed water pump compared to the boiler steam pressure is

A. Same
B. Slightly less
C. Slightly more
D. Much more

Question 224

The thickness of oxide film is y at time t. If K₁, K₂ and K₃ are the temperature dependent constants, the parabolic law of oxidation is given by

A. y² = 2k₁t + k₂
B. y = k₁ ln (k₂t + k₃)
C. y = k₁ t + k₂
D. y = k₁t³ + k₂

Question 225

__________ is the hardest material out of the following.

A. Boron carbide
B. Tungsten carbide
C. Hardened steel
D. Silicon carbide

Question 226

Function of fusible plug in a boiler is to

A. Drain out water and sludge from the boiler during repair
B. Put off fire in the furnace when water level in the boiler falls to unsafe limit
C. Guard the boiler in case of abnormal rise in steam pressure
D. All of the above

Question 227

Lead is poured into the joint between two __________ pipes.

A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement

Question 228

The highest stress that a material can withstand for a specified length of time without excessive deformation is called the __________ strength.

A. Creep
B. Endurance
C. Fatigue
D. None of these

Question 229

Overheating of satellites during re-entry to earth is controlled by

A. Thick insulation
B. Ceramic lining
C. Cooling by flow of air over the surface
D. None of these

Question 230

Closeness of packing is maximum in case of __________ crystal lattice.

A. Face centred
B. Simple cubic
C. Body centred
D. None of these

Question 231

__________ remains constant during the adiabatic cooling of moist air.

A. Wet bulb temperature
B. Dry bulb temperature
C. Relative humidity
D. Specific humidity

Question 232

__________ iron is produced by the annealing of white cast iron.

A. Malleable
B. Nodular
C. Ductile
D. Grey

Question 233

Preheating before welding is done to

A. Make the plate softer
B. Burn oil & grease sticking to plate surfaces
C. Avoid plate distortion
D. Prevent cold cracks

Question 234

Sterilised zone' around a hazardous chemical industry is an area with __________ km radius around it, in which the total population/inhabitants should be less than 20000 preferably in the upwind direction.

A. 0.5
B. 5
C. 25
D. 50

Question 235

__________ of test specimens is not involved in any hardness testing method.

A. Fracture
B. Indentation
C. Wear
D. Scratch

Question 236

During brazing, if the fluxes are entrapped, it results in the

A. Distortion of brazed joints
B. Cracking of joints
C. Presence of gas pockets
D. Corrosion

Question 237

The kinematic viscosity (in stoke) and the absolute/dynamic viscosity (in poise) are the same for __________ at room temperature.

A. Air
B. Water
C. Mercury
D. Alcohol

Question 238

Case hardening is not done by

A. Nitriding
B. Hot dipping
C. Electroplating
D. Both B & C

Question 239

The suction and delivery pressure for a two stage compressor are 1 and 25 atm respectively. The intermediate stage pressure would be around __________ atm.

A. 5
B. 10
C. 15
D. 20

Question 240

Increase in the entropy of a system represents the

A. Degradation of energy
B. Decrease in system pressure
C. Increase in the availability of energy
D. Increase in the temperature

Question 241

The size of the tetrahedral void in the closest packing of atoms is __________ that of the octahedral void.

A. Equal to
B. Greater than
C. Less than
D. Either A, B or C; depends on the size of atom

Question 242

A spark ignition petrol engine has

A. Throttle valve
B. Carburettor
C. Both A & B
D. Neither A nor B

Question 243

Cast iron compared to steel is better in

A. Ductility
B. Strength
C. Malleability
D. Fluidity & castability

Question 244

X-rays do not exhibit the property of

A. Reflection
B. Scattering
C. Diffraction
D. Dispersion

Question 245

A floating body oscillates about its __________ when it is displaced slightly.

A. Centre of gravity
B. Metacentre
C. Centre of buoyancy
D. Centre of pressure

Question 246

Cathodic protection is widely used in controlling corrosion in

A. High pressure vessels
B. Marine structure & underground pipelines
C. Overhead fuel gas pipelines
D. Overhead water pipelines

Question 247

A cylinderical rod subjected to a tensile strain within the elastic limit undergoes a volume change. If the volume strain is equal to half the tensile strain, then the Poisson's ratio of the rod is

A. 0
B. 0.33
C. 0.44
D. 0.25

Question 248

In practice, the compression ratio of compression-ignition (CI) engine ranges from

A. 15 to 25
B. 5 to 10
C. 40 to 55
D. 60 to 70

Question 249

To improve the machinability of steel, it is generally subjected to

A. Spherodising
B. Tempering
C. Normalising
D. Annealing

Question 250

Potable water means the water used for

A. Fire-fighting
B. Cooling
C. Drinking
D. Evaporation to produce steam

Question 251

The maximum axial compression stress during cold upsetting of a cylinderical rod of radius (r) occurs at

A. The outer edge of the rod
B. R/3 from the centre
C. R/2 from the centre
D. The centre

Question 252

Fire refining process is employed in case of

A. Tin
B. Copper
C. Zinc
D. Aluminium

Question 253

The most detrimental impurity in high pressure boiler feed water is

A. Suspended salt
B. Dissolved salt
C. Silica
D. Turbidity

Question 254

Holes for rivetting purposes should be preferably made by

A. Cutting torch
B. Drilling
C. Punching
D. None of these

Question 255

__________ is the most suitable lubricant for drawing mild steel wires?

A. Kerosene
B. Water
C. Sodium stearate
D. Lime water

Question 256

Production of a hollow product by inflation of a tube or parison is called the __________ process.

A. Blow moulding
B. Calendering
C. Extrusion
D. Injection

Question 257

Use of flux during soldering is done to

A. Increase flidity of solder by lowering its melting temperature
B. Prevent oxide formation
C. Wash away surplus solder
D. Full up the joint gap

Question 258

Which of the following hardness tests uses the depth of penetration caused by the indentor as the parameter for arriving at the hardness value of a material ?

A. Shore sceleroscope test
B. Vicker's hardness test
C. Brinell hardness test
D. Rockwell hardness test

Question 259

Out of the following, the most melleable material is

A. Copper
B. Aluminium
C. Wrought iron
D. Lead

Question 260

Force between the molecules of the same substance is called __________ force.

A. Adhesive
B. Cohesive
C. Molecular
D. Vander Walls

Question 261

Though tin occurs lower than iron in the electrochemical series, yet it is coated on steel for corrosion protection, because of its

A. Lower cost
B. Abundant availability
C. Resistance to vegetable acids as the tin plate are commercially used in 'canning' industry
D. None of these

Question 262

Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.

A. Wrought
B. Tool
C. Alloy
D. Plain carbon

Question 263

Main alloying element in Elinvar used in precision instruments, hair springs for watches etc. is

A. Chromium
B. Nickel
C. Zinc
D. Aluminium

Question 264

Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as

A. Gr0.25, Gr
B. Gr0.25, Gr0.33
C. Gr, Gr0.25
D. Gr0.33, Gr0.25

Question 265

Viscoelastic behaviour is observed in __________ materials.

A. Non-crystalline organic polymeric
B. Ceramic
C. All crystalline
D. All of the above

Question 266

Isotropic materials have the same __________ in all directions.

A. Induced stresses
B. Density
C. Elastic properties
D. Thermal properties

Question 267

Two wires of the same radius & material having length in the ratio of 1 : 2 are stretched by the same force. The strain produced in the two wires will be in the ratio of

A. 1:1
B. 1:2
C. 2:1
D. 1:4

Question 268

Ultimate strength in tension as compared to that in shear for steel is

A. Half
B. One third
C. One and half times
D. One fourth

Question 269

Which of the following is not an ore of zinc?

A. Cerrusite
B. Franklinite
C. Calamine
D. Troosite

Question 270

Which of the following fastening devices has its both ends threaded?

A. Bolt
B. Stud
C. Set screw
D. Split nut

Question 271

Light year is the unit of

A. Distance
B. Time
C. Intensity of light
D. None of these

Question 272

Adhesives

A. Can't be used in the form of pressure sensitive tapes
B. Can't join two dissimilar metals
C. Cure instantaneously after application on a surface
D. None of these

Question 273

Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the

A. Length of the pipe
B. Diameter of the pipe
C. Density of the fluid
D. Velocity of the fluid

Question 274

The leaching solvent used in Baeyer's process for the purification of bauxite is

A. Ammonium hydroxide
B. Sodium carbonate
C. Sodium hydroxide
D. Ammonium carbonate

Question 275

Baffles provided on the shell side of a shell and tube heat exchanger are meant for

A. Providing support for the tubes
B. Improving heat transfer
C. Both A & B
D. Preventing the fouling of tubes & stagnation of shell side fluid

Question 276

A static fluid can not have

A. Zero shear stress
B. Positive normal stress
C. Non-zero shear stress
D. None of these

Question 277

Lead is most readily dissolved in

A. Acetic acid
B. Hydrochloric acid
C. Nitric acid
D. Sulphuric acid

Question 278

Which of the following does not lower the surface tension of liquids ?

A. Fat
B. Soap
C. Detergent
D. Surfactant

Question 279

Production of one ton of steel plate in a modern integrated steel plant in India consumes about __________ kWh of electricity.

A. 50
B. 250
C. 450
D. 850

Question 280

__________ test determines the yield strength, Young's modulus of elasticity, percentage reduction in area & percentage elongation of a material.

A. Tensile
B. Fatigue
C. Impact
D. None of these

Question 281

Ceramic compounds as compared to metallic compounds

A. Crystallise faster
B. Resist greater tensile stress at room temperature
C. Have higher melting temperature
D. Are better conductor of electricity at higher temperature

Question 282

The dimensional formula of bulk modulus of elasticity is same as that of the

A. Pressure
B. Density
C. Force
D. None of these

Question 283

The ratio of coil diameter to wire diameter of a spring is called the spring

A. Index
B. Deflection
C. Form co-efficient
D. None of these

Question 284

Matte smelting is used in the extraction of

A. Lead
B. Zinc
C. Aluminium
D. Copper

Question 285

Ignition of fuel in a diesel engine is by

A. Spark
B. Hot compressed air
C. Fuel injection
D. None of these

Question 286

Which of the following hardness tests does not measure the indentation hardness of metals and alloys ?

A. Vicker's hardness test
B. Shore sceleroscope test
C. Brinell hardness test
D. Rockwell hardness test

Question 287

High relative humidity decreases the evaporative process and as the temperature is increased, the relative humidity decreases. The comfort range for human body is the ambient temperature of 22 to 27°C with relative humidity ranging from __________ percent.

A. 5 to 10
B. 15 to 25
C. 45 to 50
D. 75 to 80

Question 288

Material having maximum density is

A. Plutonium
B. Osmium
C. Titanium
D. Uranium

Question 289

Carbon percentage in high speed steel tool material is 0.6 to 1.0. The hardness of carbon tool steels is increased, when it is alloyed with

A. Vanadium & chromium
B. Silicon
C. Tungsten
D. Manganese

Question 290

__________ of air does not increase with increase in temperature.

A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity

Question 291

Out of the following materials, the one which generally exhibits an yield point is

A. Hard bronze
B. Soft brass
C. Cold rolled mild steel
D. Hot rolled mild steel

Question 292

The instrument based on the following principle is used for the measurement of oxygen only in the flue gases.

A. Chemical absorption
B. Thermal conductivity
C. Infrared absorption
D. Paramagnetism

Question 293

The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm mole, its fugacity at 300 K would be

A. 3171Pa
B. 3567Pa
C. 1.01 x 10⁵Pa
D. 5000Pa

Question 294

The bulk modulus of a material with Poisson's ratio of 0.5 is equal to

A. 3 x Young's modulus
B. Young's modulus
C. Infinity
D. Zero

Question 295

__________ addition increases the depth of hardness of steel.

A. Chromium
B. Nickel
C. Tungsten
D. Vanadium

Question 296

With increase in carbon percentage in steel, its

A. Yield stress decreases
B. Elongation percent increases
C. Tensile strength increases
D. Impact strength increases

Question 297

Heat release during phase change is observed in case of a/an

A. Boiler
B. Condenser
C. Evaporator
D. All of the above

Question 298

Otto cycle used in spark ignition petrol engines is also known as the constant __________ cycle.

A. Volume
B. Pressure
C. Heat
D. None of these

Question 299

Electrolytic reduction cell used for conversion of calcined Al2O₃ to Al is a carbon lined furnace operating at 800-900 °C. The purpose of electric current supplied to the furnace is to

A. Achieve very high purity of aluminium (99.9%)
B. Keep the electrolyte in liquid condition by the generation of heat
C. Electrolytically dissociate alumina
D. Both(b) & (c)

Question 300

Pig iron is

A. Made from cast iron
B. Made from wrought iron
C. The one, which comes out of the blast furnace
D. Free from impurities

Question 301

Hot & cold working of material causes its __________ deformation.

A. Visco-elastic
B. Isotropic
C. Elastic
D. Plastic

Question 302

Drills are usually made of

A. Cermets
B. High speed steel
C. Alloy steel
D. Tungsten carbide

Question 303

Brass parts with high residual tensile stress at the surface are susceptible to season cracking (i.e. spontaneous cracking occuring on exposure to atmospheric corrosion), if its zinc percentage is more than

A. 5
B. 10
C. 20
D. 35

Question 304

Steel rods are normally used for concrete reinforcement because concrete and steel have almost equal

A. Tensile strength
B. Compressive strength
C. Young's modulus
D. Thermal co-efficient of expansion

Question 305

The most serious manufacturing defect from fracture toughness point of view is

A. Surface roughness
B. Pores
C. Spherical inclusion
D. Crack

Question 306

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs?

A. Enthalpy
B. Relative humidity
C. Wet bulb temperature
D. Dew point temperature

Question 307

Powder metallurgy process does not make metal powder by

A. atomisation
B. grinding/milling
C. hammering
D. electrolytic deposition

Question 308

Alumina, silica, lime and iron oxide are the basic raw material for the manufacture of portland cement. The component of Portland cement which first hardens is

A. 5CaO . 3 Al2O₃
B. 3CaO . Al2O₃
C. 3CaO . SiO₂
D. 2CaO . SiO₂

Question 309

Steel & cast iron pipes are produced by __________ casting.

A. Slush
B. Die
C. Investment
D. True centrifugal

Question 310

The most suitable material for a sewer for carrying storm water is

A. Asbestos cement
B. Cast iron
C. Mild steel
D. Cement concrete

Question 311

The routing function in a production system design is concerned with the

A. Material flow optimisation through the plant
B. Machine utilisation
C. Quality control of the product
D. Manpower utilisation

Question 312

The yield point in fatigue loading compared to that in static loading is less. The ratio of ultimate tensile strength to endurance limit of a material subjected to fatigue loading is

A. 0.5
B. 1
C. 1.5
D. 2

Question 313

The heat of neutralisation remains constant, when there is a reaction between dilute solutions of strong

A. Base and strong acid
B. Base and weak acid
C. Acid and weak base
D. None of these

Question 314

The machanism involved in the removal of metal in drilling operation is by

A. Compression
B. Extrusion
C. Shearing
D. Both A & C

Question 315

Which of the following is not a characteristic observed in material failure by fatigue fracture ?

A. Plastic deformation of material does not occur
B. Initiation of crack from below the surface does not occur
C. Initation of crack occurs on the surface of the machine part
D. Presence of both rough & smooth zone with conchoidal markings in smooth zone of the surface

Question 316

The property of material, by which a given amount of energy is absorbed by it, without plastic deformation is called

A. Resilience
B. Toughness
C. Ductility
D. Impact strength

Question 317

Which drug is made from vegetables ?

A. Pencilin
B. Aspirin
C. Quinine
D. Insulin

Question 318

Which of the following is the most wear resistant grade of carbide used for the cutting tools?

A. Aluminium carbide
B. Tungsten carbide
C. Nickel carbide
D. Iron carbide

Question 319

Minimum safe distance between two liquid fuel storage tanks is equal to (where, H = height of the tank)

A. H
B. H/2
C. H/4
D. H/6

Question 320

Which of the following is a boiler accessory i.e., not a boiler mounting ?

A. Blow off cock
B. Feed check valve
C. Feed water pump
D. Stop valve

Question 321

Energy of the sun arises mainly from __________ reactions.

A. fusion
B. fission
C. combustion
D. none of these

Question 322

Work done by a/an __________ process is determined by ∫p.dV.

A. Adiabatic
B. Quasi-static
C. Isothermal
D. Isentropic

Question 323

Blast furnace slag is mainly molten

A. Sand
B. Magnesium silicate
C. Calcium silicate
D. Iron pyrite

Question 324

Cold chiesel & hammers are made of

A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel

Question 325

Which of the following forces does not act on a fluid at rest?

A. Viscous force
B. Gravity force
C. Hydrostatic force
D. Surface tension force

Question 326

Property of a material to resist a tensile force without giving away is a measure of its

A. Stiffness
B. Toughness
C. Resilience
D. Tenacity

Question 327

At the point of boundary layer separation in fluid flow, the

A. Shear stress is maximum
B. Velocity gradient is flat
C. Density variation is maximum
D. Shear stress is zero

Question 328

Large diameter shafts are manufactured by

A. Hot rolling
B. Cold drawing
C. Casting and turning to size
D. Forging and turning to size

Question 329

One of the methods of purification of leach liquor is ion exchange, which involves

A. Exchange between two liquid phases
B. Exchange between a gaseous phase and a liquid phase
C. Exchange between a liquid phase and an organic resin phase
D. Exchange between a solid phase and a gas phase

Question 330

In an eutectic system, two elements are completely

A. Soluble in solid state
B. Insoluble in liquid state
C. Insoluble in both solid & liquid state
D. Soluble in liquid state

Question 331

Which of the following welding processes employs the highest welding temperature ?

A. Arc welding
B. Gas welding
C. Thermit welding
D. Resistance welding

Question 332

Brazing is the joining of metals

A. Without melting the base metal
B. With a non-ferrous filler
C. Both A & B
D. Neither A nor B

Question 333

Fluorine is not a constituent of

A. Freon
B. Chloroform
C. Teflon
D. Fluorocarbons

Question 334

Secondary hardening in steels arises out of the

A. Precipitation of fine alloy carbides at high temperatures
B. Refinement of ferrite grain size by working
C. Decomposition of retained austenite upon heat treatment
D. Precipitation of complex inter-metal-lics upon heat treatment

Question 335

In a casting, cold shut defect is caused by

A. Low pounhg temperature
B. Melt-mould reactions
C. Faulty gating system
D. Very low mould permeability

Question 336

Carburettor in a spark ignition engine is used to

A. Mix air-fuel in the desired ratio
B. Maintain a constant speed at varying loads
C. Adjust the stroke length
D. Increase the compression ratio

Question 337

Shaft/rotor speed is most accurately measured by a

A. Frequency counter
B. Tachometer
C. Strobometer
D. Speedometer

Question 338

Out of the following, __________ pipe is the least corrosion resistant.

A. Mild steel
B. Copper
C. Wrought iron
D. Stainless steel

Question 339

Unit of surface tension in S.I. unit is

A. Watt/m
B. Joule/m²
C. Newton/m²
D. Joule/m

Question 340

Source of heat supply in a cupola is

A. Coke
B. Charcoal
C. Lumpy coal
D. Pulverised coal

Question 341

During sensible cooling of air, its wet bulb temperature

A. Decreases but dew point remains constant
B. Increases but dew point remains constant
C. Increases & the dew point decreases
D. Decreases & the dew point increases

Question 342

An "orange peel" effect is observed

A. As a defect during metal casting/ welding
B. During deep drawing of metallic sheet having large grain size
C. During faulty heat treatment of steel
D. During extrusion of metal through a die

Question 343

__________ property of a material is determined by the Herbert Pendulum device.

A. Hardness
B. Tensile
C. Toughness
D. Compressive

Question 344

Tungsten in high speed steel is responsible for its

A. Toughness & wear resistance
B. Cold hardness
C. Hot hardness
D. Sharp cutting edge

Question 345

Plastics as a material of construction suffer from the drawback of low

A. Machinability
B. Density
C. Strength
D. Plastic deformation

Question 346

Load cells used for the measurement of weight has

A. Compact & rugged construction with an accuracy of 0.1 to 1%
B. No moving parts and incurs negligible deflection under load
C. Provision of thermal compensation and is hermetically sealed
D. All of the above

Question 347

Safety matches is produced using

A. Red phosphorus
B. Yellow phosphorus
C. Black phosphorus
D. Elemental sulphur

Question 348

When the weight of a ball inside the ball mill is just balanced by the centrifugal force,

A. The ball abandons its circular path for a parabolic path
B. The ball abandans its parabolic path for a circular path
C. The ball continues to move on a circular path
D. The ball continues to move on a parabolic path

Question 349

Suitability of steel for its use in cable is judged by its strength in

A. Tension
B. Compression
C. Torsion
D. Shear

Question 350

Pick out the wrong statement.

A. In Parke's process, zinc is added to remove silver from lead
B. In the Pidgeon process of producing magnesium, powdered ferro-silcon is used as the reducing agent
C. Molten lead is used for shock cooling of the zinc vapours in the zinc blast furnace
D. Pure copper electrodes are used as anode for electro-refinning of copper

Question 351

Material of construction of foundary crucible is

A. Graphite
B. Lead
C. Porcelain
D. Stainless steel

Question 352

Euler number is defined as the ratio of inertia force to __________ force.

A. Pressure
B. Elastic
C. Gravity
D. Viscous

Question 353

Lime contains about 90% CaO. Percentage CaO present in limestone is about

A. 25
B. 50
C. 70
D. 80

Question 354

Neutrons are present in all atoms except that of

A. He
B. C
C. H
D. Ar

Question 355

Function of feed check valve in a boiler is to

A. Facilitate circulation of high pressure feed water
B. Check the water level in the boiler drum
C. Prevent the back flow of water
D. Regulate the water flow to boiler

Question 356

__________ has a negative co-efficient of linear expansion.

A. Iron
B. Copper
C. Rubber
D. Nickel

Question 357

Old cycle handles are coated with nickel using

A. Cementation
B. Spray coating
C. Galvanising process
D. Tinning process

Question 358

L.D. converters are generally lined with

A. Magnesite
B. Fireclay
C. Chrome magnesite
D. Silica

Question 359

For the running of power generating turbines, the steam used should be

A. Wet
B. Superheated
C. At ordinary pressure
D. None of these

Question 360

Alloying elements present in Hayness stel-lite, which has superior performance than high speed steel, are

A. Nickel, cobalt & chromium
B. Tungsten, chromium & cobalt
C. Manganese, chromium & cobalt
D. Tungsten, molybdenum & nickel

Question 361

In case of fluid moving machineries, the relationship between saturation temperature and pressure decides the process of

A. Water hammer
B. Cavitation
C. Flow separation
D. Turbulent mixing

Question 362

Killed steels

A. Are free from oxygen
B. Contain not even traces of sulphur & phosphorous
C. Are produced by L.D. process only
D. Contain minimum impurity level

Question 363

Which one is neutral in character ?

A. N₂O₄
B. N₂O
C. N₂O₅
D. N₂O₃

Question 364

The yield point phenomenon observed in annealed low carbon steel is due to the presence of the following element.

A. Silicon
B. Carbon
C. Phosphorous
D. Chromium

Question 365

Titanium alloys are welded using the Following process:

A. TIG welding.
B. Submerged arc welding.
C. Butt welding.
D. Electron beam welding.

Question 366

The standard instrument used for calibrating the load applied by universal testing machine is called

A. Extensometer
B. Spring balace
C. Dynamometer
D. None of these

Question 367

Magnesium is present in

A. Haemoglobin
B. Chlorophyll
C. Hypo solution
D. None of these

Question 368

Change in volume of metals from absolute zero temperature to their melting points is

A. Almost same for all metals
B. Different for different metals
C. Less for low melting point metals
D. Less for high melting point metals

Question 369

In continuous casting of liquid steel, the mould is made of

A. Water cooled steel
B. Water cooled copper
C. Refractory oxide
D. Silicon carbide

Question 370

__________ property of steel increases by addition of large amount of silicon in it.

A. Mechanical
B. Machining
C. Magnetic
D. Refractory

Question 371

Which of the following is a commonly used manometric liquid for low pressure range?

A. Ethyl alcohol
B. Carbon tetrachloride
C. Glycerol
D. Ethylene glycol

Question 372

__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

A. Packed
B. Bubble
C. Spray
D. Tray

Question 373

Ingrannular corrosion occurs __________ stainless steel.

A. In all types of steels except
B. At the surface of
C. Along grain boundaries of
D. In the core of

Question 374

Spherical shape of mercury droplets is due to its

A. High viscosity
B. Low surface tension
C. High density
D. High surface tension

Question 375

Lubricants can be used to

A. Transmit power hydraulically
B. Form a seal in compressors
C. Remove contaminants by flushing and to insulate transformers, switchgears etc
D. All of the above

Question 376

__________ the exhaust gas is an indication of the incomplete combustion of fuel.

A. Low temperature of
B. High temperature of
C. High % of CO in
D. High % of CO₂ in

Question 377

Fatigue limit improvement by over stressing the metal by successively increasing the load is called coaxing. In fatigue failure, the material fails

A. Below the yield point
B. Above the yield point
C. Below the elastic limit
D. At the elastic limit

Question 378

Which set of materials is used as a moderator in nuclear reactor?

A. Zircalloy & berrylium
B. Zircalloy & heavy water
C. Zirconium & berrylium
D. Heavy water & berrelium

Question 379

The most suitable material for die casting is

A. Iron
B. Copper
C. Steel
D. Nickel

Question 380

What is the range of tempering temperature (°C) for most of the materials ?

A. 75-100
B. 200-300
C. 350-450
D. 500-600

Question 381

Maraging steels derive their strength from the following mechanism:

A. A fine, highly dislocated and strong martensite
B. Fine dispersions of intermetallics of Fe, Ni, Ti etc
C. Fine dispersions of alloy carbides in a ferrite matrix
D. Fine dispersions of Fe₃ C nucleated on dislocations in austenite

Question 382

Which of the following is an undesirable property of slag produced during the pyrometallurgical method of metal extraction from its ore?

A. High fusibility & fluidity
B. High thermal conductivity
C. Low density
D. High chemical activity

Question 383

Alloy powder manufactured by the following process have spherical shapes.

A. Electrochemical deposition
B. Gaseous reduction
C. Atomisation
D. Mechanical attrition

Question 384

Styrofoam is the commercial name of

A. Polyurathene
B. Polystyrene
C. Polyacrylonitrile
D. Polybutadiene

Question 385

Which of the following is an unconventional source of energy ?

A. Thermal power
B. Hydroelectric power
C. Nuclear-fusion power
D. Solar power

Question 386

Which is the most suitable joint for the pipes, with are laid submerged under water, where the bottom of the river bed is uneven?

A. Collar joint
B. Flexible joint
C. Flanged joint
D. Expansion joint

Question 387

For hardening high alloy steel, it is to be heated slowly and uniformly to avoid

A. Local hardening
B. Scale formation
C. Segregation
D. Warpage

Question 388

Large scale fire on fuel gas line is normally extinguished by

A. Water
B. Steam
C. Foam
D. Nitrogen

Question 389

Floating control action

A. Moves the final control element at constant speed in either direction in response to an error signal
B. Changes the position of the final control element from on to off
C. Is used to counteract rapid load changes
D. None of these

Question 390

Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature.

A. Steel
B. Lignite
C. Water
D. Lime stone

Question 391

__________ furnace is generally used in the non-ferrous foundaries.

A. Direct arc
B. Indirect arc
C. Resistance
D. Induction

Question 392

Frother is added in the froth floatation cell used in ore beneficiation to stabilise the air bubbles (i.e., froth), which will hold the ore particles, but it does not affect the floatability of minerals. Which of the following is not used as a frother?

A. Cresylic acid
B. Xanthaies
C. Pine oil
D. All of the above

Question 393

In extrusion of metals, which of the following statement is true ?

A. Speed of the extruded material is same as that of ram speed
B. Redundant work is a function of the die angle
C. Relative motion between the billet surface and the container wall is always present
D. Hollow ram is used for indirect extrusion

Question 394

Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.

A. Fracture
B. Dislocation
C. Slip
D. Twinning

Question 395

Heat treatment of steel is done to mainly change its __________ properties.

A. Physical
B. Chemical
C. Mechanical
D. Surface

Question 396

At room temperature, F.C.C. crystal structure is observed in

A. Lead
B. Cupro-nickel
C. Titanium
D. Tungsten

Question 397

For separating small pieces of metal from engine oil of a car, the best separating technique is the

A. Chromatography
B. Evaporation
C. Filtration
D. Fractional distillation

Question 398

Out of the following, the __________ pipe has the least corrosion resistance.

A. Mild steel
B. Copper
C. Cast iron
D. Wrought iron

Question 399

A fluid is termed as the Newtonion fluid, when the shear stress is __________ the velocity gradient.

A. Independent of
B. Inversely proportional to
C. Directly proportional to
D. None of these

Question 400

Moist climate is the most favourable factor in the site selection far a

A. Steel plant
B. Textile factory
C. Petroleum refinery
D. Coke oven battery

Question 401

Glycerene is used as a coolant in cooling of some engines instead of water, because

A. Its higher boiling point (290°C) increases its heat carrying capacity
B. Compartively less weight of coolant is required
C. Smaller radiator can be used
D. All of the above

Question 402

Sudden immersion/dipping of red hot steel bar in water makes it

A. Malleable & tough
B. Ductile & soft
C. Brittle & hard
D. None of these

Question 403

The hardenability of steel decreases with

A. Decrease in dislocation density
B. Increase in solutionising temperature
C. Increase in strength
D. Decrease in grain size

Question 404

Which of the following is not categorised as the ore agglomeration process?

A. Nodulising
B. Pelletising
C. Balling
D. Briquetting

Question 405

The material used for coating the welding electrode is termed as the

A. Flux
B. Slag
C. Protective layer
D. Binder

Question 406

Which of the following properties of a solid is not dependent on crystal imperfection ?

A. Ductility
B. Semiconductiyity
C. Melting point
D. Yield stress

Question 407

Air-petrol ratio for maximum power generation in spark ignition engine is about

A. 6:1
B. 12 : 1
C. 18 : 1
D. 24 : 1

Question 408

The effect of friction on the flow of steam through a nozzle is to decrease the __________ of steam.

A. Wetness
B. Mass flow rate
C. Both A & B
D. Neither A nor B

Question 409

Pick out the wrong statement.

A. Molecules with symmetrical arrangements (.e.g. CH₄ or CCl₄) are nonpolar
B. Generally, nonpolar compounds are chemically inactive, conduct electricity poorly and do not ionise
C. Most of the hydrocarbons are nonpolar
D. None of these

Question 410

A simple closed grinding circuit may consist of

A. A ball mill and a classifier
B. A rod mill and a hydrocyclone
C. A jaw crusher and a hydrocyclone
D. A ball mill and a froth floatation cell

Question 411

Compression ratio of an I.C. engine is the ratio of the

A. Clearance volume to the volume swept by piston per stroke
B. Volume of air in cylinder before compression to that after compression
C. Pressure after compression to that before compression
D. None of these

Question 412

Calorific value of __________ are almost same.

A. Lignite & anthracite coal
B. Lignite & coal gas
C. Petrol & diesel
D. Coal gas & natural gas

Question 413

The burnout heat flux in the nucleate boiling regime is not a function of the

A. Liquid density
B. Vapour density
C. Temperature difference
D. Heat of evaporation

Question 414

In the Bayer's process, bauxite is digested under pressure using

A. H₂SO₄
B. NaOH
C. NH₃
D. HCl

Question 415

Which of the following is not an ore of copper?

A. Cryolite
B. Azurite
C. Chalcopyrite
D. Malachite

Question 416

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

A. Is trebled
B. Remains unchanged
C. Decreases by a factor of √3
D. Decreases by a factor of 1/3

Question 417

CANDU type nuclear reactor using natural uranium as fuel is the extensively used nuclear reactor because of the fact that the

A. Specific fuel consumption is very low due to the use of heavy water
B. Fuel cost is much lower than that used in pressurised water or boiling water reactor
C. Heavy water is used both as coolant as well as moderator
D. Both B and C

Question 418

__________ of austenite decreases the hardenability in steel.

A. Fine grains
B. Coarse grains
C. Homogeneity
D. Dissolved elements (except cobalt)

Question 419

__________ is the most important element, which controls the physical properties of steel.

A. Manganese
B. Silicon
C. Carbon
D. Vanadium

Question 420

Nickel and __________ are the alloying element added in steel to increase its toughness.

A. Molybdenum
B. Chromium
C. Vanadium
D. Silicon

Question 421

Brittleness induced due to the presence of sulphur in steel can be reduced by adding

A. Manganese
B. Magnesium
C. Vanadium
D. Copper

Question 422

Limestone addition in the blast furnace is done to flux __________ present in the raw materials.

A. SiO₂
B. Al2O₃
C. MnO₂
D. P

Question 423

Gage pressure within a spherical droplet of a fluid is 'p'. What will be gage pressure within a bubble of the same size & of the same fluid ?

A. p
B. 2 p
C. 0.5 p
D. 0.25 p

Question 424

Which of the following relatively employs the highest heat transfer surface area in a high pressure boiler ?

A. Airpreheater
B. Economiser
C. Steam superheater
D. Furnace water wall

Question 425

L.D. (Linz-Donawitz) converter is used in the production of

A. Copper
B. Steel
C. Zinc
D. Aluminium

Question 426

Insulation of liquid surface can be achieved by __________ on top of its surface.

A. Floating hollow polypropylene spheres
B. Spraying alumina powder
C. Putting cement
D. None of these

Question 427

The starting of a car takes time in winter, because the

A. Octane number of fuel is decreased
B. Fuel supply for ignition is not sufficient
C. Vaporisation of the fuel is decreased
D. Pour point of fuel decreases

Question 428

The following is a typical anionic collector used in flotation.

A. Ethyl dixanthogen
B. Trimethyl cetyl ammonium bromide
C. Potassium ethyl xanthate
D. LAuryl amine hydrochloride

Question 429

The units of the rate constant for a second order reaction are

A. Sec⁻¹. mole°
B. Moles¹. sec⁻¹
C. Moles⁻¹. sec¹
D. Moles¹. sec¹

Question 430

At absolute zero temperature, for any reaction involving condensed phases

A. Δ G° = 0 , Δ H° = 0
B. Δ H° = 0 , Δ S° = 0
C. Δ S° = 0 , Δ E° = 0
D. Δ S° = 0 , Δ Cp° = 0

Question 431

A common disinfectant used in village wells for disinfection of water is

A. Free chlorine
B. Bromine
C. Iodine
D. Potassium permanganate

Question 432

The approximate height of a blast furnace having a useful volume of 2000 m³ is about __________ metres

A. 25
B. 35
C. 55
D. 75

Question 433

Screws are specified by their __________ diameters.

A. Minor
B. Major
C. Pitch
D. None of these

Question 434

Corrosion of metals can not be prevented by its

A. tempering
B. chromising
C. aluminising
D. alloying

Question 435

The quantity of electricity required to deposit one gm equivalent of any substance is one

A. Ampere
B. Coulomb
C. Microfaraday
D. Faraday

Question 436

Pressure exerted by a liquid depends upon its

A. Surface tension
B. Density
C. Viscosity
D. Buoyancy

Question 437

In extrusion of metals, which of the following statement is true ?

A. speed of the extruded material is same as that of ram speed.
B. Redundant work is a function of the die angle.
C. Relative motion between the billet surface and the container wall is always present.
D. Hollow ram is used for indirect extrusion.

Question 438

On increasing the yield strength of a steel from 450 to 650 MPa, its __________ will increase.

A. Ultimate tensile strength (UTS)
B. Modulus of toughness
C. Percent elongation
D. Modulus of resilience

Question 439

Faraday's law of electrolysis is related to the

A. Cation speed
B. Atomic number of the cation
C. Equivalent mass of the electrolyte
D. None of these

Question 440

__________ is the process used for setting up compressive stresses in the surface of a metal to improve its fatigue strength.

A. Lancing
B. Shot peening
C. Slugging
D. Spinning

Question 441

Laser welding is widely employed in the __________ industries.

A. Electronic
B. Structural
C. Process
D. Heavy

Question 442

Young's modulus of elasticity of a material is the slope of the initial linear portion of the stress-strain curve. It decreases ap-preciablyby

A. Alloying additions
B. Heat treatment
C. Cold work
D. Increasing temperature

Question 443

Value of a material is usually considered as a relationship between

A. Cost and profit
B. Utility and appearance
C. Utility and cost
D. Reliability and utility

Question 444

Thermal expansion of solid is employed in the temperature measurement by a

A. Bimetallic thermometer
B. Thermocouple
C. Mercury thermometer
D. Resistance thermometer

Question 445

Holes in a plate for rivetted joints is preferably made by

A. Drilling
B. Tapping
C. Reaming
D. Punching

Question 446

__________ cycle is the most efficient thermodynamic cycle.

A. Diesel
B. Otto
C. Rankine
D. Carnot

Question 447

Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching.

A. Grey
B. Red
C. Orange
D. Violet

Question 448

Dryness fraction of dry steam is

A. 0
B. ?
C. 1
D. 0.5

Question 449

Acetylene should never be conveyed through __________ pipe, as it forms an unstable compound that dissociates violently at the slightest shock.

A. Stainless steel
B. Copper
C. Aluminium
D. Brass

Question 450

In an amorphous material, atoms defy any definite atomic structure and exist in random pattern just like in liquid. Which of the following is an amorphous material?

A. Tin
B. Lead
C. Zinc
D. Glass

Question 451

Energy to be supplied to the radioactive nucleus for the emission of a neutron is __________ MeV.

A. 0.8
B. 7.8
C. 200
D. 10000

Question 452

Out of the following, the most ductile material is

A. Mild steel
B. Copper
C. Nickel
D. Aluminium

Question 453

Air standard Otto cycle is more efficient than the diesel cycle for the same

A. Heat addition & compression ratio
B. Heat addition & pressure
C. Compression ratio & pressure
D. Cylinder dimension & rpm

Question 454

Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.

A. 597
B. 959
C. 1147
D. 1493

Question 455

Pick out the correct statement.

A. Materials exhibiting high elasticity obey Hooke's law
B. The elastic behaviour of rubber under compression is the same as its behaviour under tension
C. The damping capacity of a material is due to its plastic deformation
D. The stress required to cause plastic flow in polycrystalline material is higher as compared to monocrystalline materials due to the presence of grains of different orientations

Question 456

__________ is not used as a material of construction in thermocouples.

A. Alumel
B. Rhodium
C. Constantan
D. Duralumin

Question 457

Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as

A. Re0.5, Re0.8
B. Re0.8, Re-0.5
C. Re0.8, Re0.5
D. Re-0.8, Re0.5

Question 458

At 100% relative humidity, the dew point temperature of moist air is

A. Less than the wet bulb temperature
B. More than the wet bulb temperature
C. Equal to the wet bulb temperature
D. Equal to the ambient temperature

Question 459

The most commonly used moderator in nuclear power plant is

A. Graphite
B. Light water
C. Heavy water
D. Berellium

Question 460

Fatigue life is expected to increase by

A. Increasing the size of the sample
B. Smooth polishing of the surface of the sample
C. Having compressive residual stresses at the surface
D. Having tensile residual stresses at the surface

Question 461

Machinability of hard alloys & tool steels is improved by

A. Spherodising
B. Annealing
C. Tempering
D. Normalising

Question 462

The taper provided on pattern for its easy & clean withdrawal from the mould is termed as the __________ allowance.

A. Casting
B. Pattern
C. Draft
D. Distoration

Question 463

The cathode in an electrochemical cell always carries

A. Negative charge
B. Positive charge
C. Zero charge
D. Positive or negative charge depending upon the nature of the cell

Question 464

A gas which is collected over water becomes moistened due to water vapor, exerts its own partial pressure at the gas temperature, which is termed as its

A. Aqueous tension
B. Saturated humidity
C. Vapor pressure
D. Absolute humidity

Question 465

__________ has the highest melting point out of the following.

A. Tungsten
B. Zirconium
C. Molybdenum
D. Tantalum

Question 466

Quartz is a __________ material.

A. Diamagnetic
B. Ferromagnetic
C. Ferroelectric
D. Piezoelectric

Question 467

For dynamic strain measurement, the wheatstone bridge used is of __________ type.

A. Voltage sensitive null
B. Voltage sensitive deflected
C. Current sensitive deflected
D. None of these

Question 468

A balanced draught boiler furnace employs __________ draught fan.

A. Induced
B. Forced
C. Both A & B
D. Neither A nor B

Question 469

Oxyacetylene reducing flame is used while carrying out welding on

A. Alloy steel
B. Grey cast iron
C. Mild steel
D. High carbon steel

Question 470

Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.

A. Slip
B. Fracture
C. Winning
D. Dislocation

Question 471

The Al2 O₃ content of cryolite in Hall-Heroult's cell is maintained between __________ percent.

A. 2-5
B. 18-20
C. 12-15
D. 6-12

Question 472

LASER

A. Stands for Light Amplification by Stimulated Emission of Radiation
B. Has the same intensity as visible light
C. Can't be used for cutting metals
D. None of these

Question 473

Which of the following does not discharge the dust collected as a dry solid?

A. Electrostatic precipitator
B. Wet scrubber
C. Bag filter
D. Gravity settling chamber

Question 474

Sudden fall of atmospheric pressure by a large amount is an indication of the

A. rain
B. cold wave
C. storm
D. fair weather

Question 475

Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.

A. -30.5
B. -78.5
C. -183.5
D. -10.5

Question 476

Which of the following pairs regarding the effect of alloying elements in steels are not matched correctly?

A. Cobalt: It contributes to rerl hardness by hardening ferrite
B. Molybdenum: It forms abrasion resisting particles
C. Phosphorous: It improves machinability in free cutting steels
D. Silicon: It reduces oxidation resistance

Question 477

Which of the following test is used for distinguishing among dry oils, semi-drying oils and non drying oils?

A. Elaiden test
B. Reichart-Meissl value test
C. Henter value test
D. Iodine value test

Question 478

Failure of a material is attributed to __________ if it fails below its yield point.

A. Impact loading
B. Fatigue
C. Creep
D. Straining

Question 479

Direct conversion of thermal energy to electrical energy is facilitated by the

A. Fuel cells
B. Photo voltaic cell
C. Magneto hydrodynamic generator
D. None of these

Question 480

In sheet metal forming, stretcher strains occur in

A. Duralumin sheets
B. Low carbon steel sheets
C. Austenitic stainless steel sheets
D. Ni-base alloy sheets

Question 481

Volume of blast furnace slag is about __________ times the volume of hot metal (pig iron) of the same weight

A. 1.5
B. 3
C. 5
D. 7

Question 482

Volumetric composition of flue gas analysed with the Orsat apparatus is : CO₂ = 12%, O₂ = 8%, CO = nil, N₂ = 80%. This flue gas composition indicates that

A. Pure oxygen has been used for combustion
B. Nitrogen percentage in the fuel is very high
C. Excess air has been used for combustion
D. Hydrogen is not present in the fuel

Question 483

Hardening of steel is not possible, unless it is heated __________ critical point.

A. Above the highest
B. Above the lowest
C. Between the first & second
D. Between the second & third

Question 484

Venturimeter is used to measure the flow rate of fluids in pipes, when the pipe is in __________ position.

A. Horizontal
B. Vertical
C. Inclined
D. Any

Question 485

The refractory brick which has good thermal shock resistance at high temperature but cracks on cooling below 400°C is

A. Magnesite
B. Chrome
C. Silica
D. Fireclay

Question 486

The single most imortant requirement for a turbine blade material is

A. Damping
B. Resilience
C. Creep resistaned
D. DBTT

Question 487

A thin, flat & square plate measuring 2 m x 2 m is freely hanging in ambient air at 25°C. It is exposed to the solar radiation falling on one side of the plate at the rate of 500 W/m ². The plate temperature will remain constant at 30°C, if the convective heat transfer co-efficient is __________ W/m² °C.

A. 50
B. 100
C. 150
D. 200

Question 488

Dialysis is the process of separating substances in the

A. Colloidal state from those present in the true solutions
B. Colloidal state from those present in the suspensions
C. Suspension from those present in the solutions
D. None of these

Question 489

Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.

A. Ideal
B. Uniform
C. Steady
D. None of these

Question 490

Kinematic viscosity of water as compared to that of air is

A. More
B. Same
C. 15% more
D. 15% less

Question 491

The speed of sound will be maximum in

A. Vacuum
B. Metal
C. Air
D. Water

Question 492

__________ are normally subjected to sub-zero treatment.

A. Highly stressed parts
B. Gauges or precision parts
C. Cold rolled sheets
D. Non machinable materials

Question 493

Feed check valve is used in steam boilers to

A. Check the water level in the boiler
B. Check the feed water flow rate
C. Feed high pressure water to boiler and guard against its backflow through it
D. None of these

Question 494

Pick out the wrong statement.

A. The equivalent stiffness of two springs (of equal stiffness
B. For a helical spring, deflection is proportional to D³ (D = mean coil diameter) or d⁴ (d = wire diameter)
C. Crushing load or columns is less than the buckling load
D. Modulus of resilience is proportional to ( stress at elastic limit)2

Question 495

Which of the following manufacturing processes produces the strongest components ?

A. Forging
B. Cold rolling
C. Hot rolling
D. Die casting

Question 496

A material is capable of resisting softening at high temperature, because of its property termed as

A. Hot temper
B. Hot hardness
C. Fatigue
D. Creep

Question 497

A material having good damping property is likely to have

A. Greater defect density
B. Fine grained structure
C. Lesser defect density
D. High tensile strength

Question 498

Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.

A. 723
B. 959
C. 1147
D. 1493

Question 499

Which of the following is not a charge material for cupola ?

A. Limestone
B. Iron scrap
C. Iron ore
D. Pig iron

Question 500

Amortization' in respect of financial obligation of a company means the

A. Liquidation of financial obligations on instalment basis
B. Commitment of financial obligation on priority
C. Liquidation of all the obsolete equipments of the company
D. Modernisation of the plant equipments

Question 501

When an isolated thermodynamic system executes a process,

A. Work is done
B. Heat transfer takes place
C. Mass flow occurs across the boundary of the system
D. No chemical reaction takes place within the system

Question 502

__________ test can be termed as the semi-distructive test.

A. Impact
B. Torsion
C. Hardness
D. Charpy

Question 503

Which of the following is normally not found in both the S.I. (petrol) & C.I. (diesel) engines?

A. Air filter
B. Fuel injector
C. Exhaust silencer
D. Battery

Question 504

In radiative heat transfer, a grey surface is the one, which has

A. Emissivity independent of wavelength
B. Grey appearance to the eye
C. Zero reflectivity
D. Equal brightness in all directions

Question 505

Silicon percentage in the silicon steel used for electrical appliances/equipments is

A. 0.3-0.4
B. 12-14
C. 3-4
D. 20-25

Question 506

__________ is used for tying the steel coloumns to concrete foundation.

A. Grouting
B. Eyebolt
C. Anchor bolts
D. Refractory castables

Question 507

Freezing of 35% oleum during its shipment in winter is avoided by the addition of small amount of

A. Hydrochloric acid
B. Methyl alcohol
C. Formic acid
D. Nitric acid

Question 508

The emf of a Deniell cell Zn | Zn²⁺ || Cu²⁺ | Cu can be increased by

A. Decreasing the surface area of the electrodes
B. Increasing the concentration of zinc sulphate solution
C. Increasing the surface area of the electrodes
D. Increasing the concentration of copper sulphate solution

Question 509

Fibre reinforced plastic (FRP) are

A. Made of glass fibre and thermoplastic resins
B. Anisotropic
C. Made of thermosetting resin and glass fibre
D. Both B and C

Question 510

Heat treatment of steel is done mainly to change its

A. Mechanical properties
B. Physical properties
C. Chemical composition
D. All of the above

Question 511

The bolt is subjected to __________ when the nut is tightened by putting the washer beneath it.

A. Tension
B. Shear
C. Compression
D. Bending & tension

Question 512

On decreasing the grain size of a polycrys-talline material, the property most likely to deteriorate is

A. Creep
B. Toughness
C. Tensile strength
D. Fatigue

Question 513

Needles are produced by

A. Forging
B. Swaging
C. Extrusion
D. Machining

Question 514

Pig iron is a product of

A. Electric arc furnace
B. Cupola
C. Blast furnace
D. Open hearth furnace

Question 515

A dummy activity is used in PERT network to describe the

A. Precedence relationship
B. Resource idleness
C. Resource restriction
D. Necessary time delay

Question 516

The heat treatment to which the steel wire containing > 0.25% carbon is subjected to is

A. Full annealing
B. Bright annealing
C. Patenting
D. None of these

Question 517

A material being tested for endurance strength is subjected to the __________ load.

A. Impact
B. Completely reversed
C. Dynamic
D. Static & dynamic

Question 518

On an average __________ fast neutrons are produced by nuclear fission of each atom of uranium⁻²35.

A. 1
B. 2.5
C. 3.5
D. 5

Question 519

An ideal material for making cooking vessels should have

A. High heat capacity
B. Low heat capacity
C. High thermal conductivity
D. Both B and C

Question 520

Vibration upto 100 kilo hertz can be most accurately measured by a __________ type accelerometer.

A. Preloaded spring
B. Piezoelectric
C. Bonded strain gauge
D. None of these

Question 521

Other parameters remaining same, the recrystallisation temperature of an alloy is lowered, when

A. Strain rate is increased
B. Grain size is increased
C. Prior cold deformation is increased
D. Not affected by any of the above parameters

Question 522

Area under the stress-strain curve upto the __________ is referred to as the modulus of resilience.

A. yield strength
B. elastic limit
C. proportional limit
D. maximum point

Question 523

Friction factor for fluid flow in pipe does not depend upon the

A. pipe length.
B. pipe roughness.
C. fluid density & viscosity.
D. mass flow rate of fluid.

Question 524

Superheated vapour behaves like

A. Dry steam
B. Gas approximately
C. An ordinary vapor
D. None of these

Question 525

Upto the critical radius of insulation, added insulation, will

A. Increase the heat loss
B. Decrease heat loss and will have no effect beyond that
C. Decrease heat flux
D. Reduce convection heat loss compared to conduction heat less

Question 526

Which of the following is not an explosive ?

A. TNT
B. CMC
C. RDX
D. Lead azide

Question 527

Absolute zero, pressure will occur, when the molecular momentum of the system becomes zero. A liquid will cease to exist as liquid at

A. High vacuum
B. Zero pressure
C. 0°K
D. Earth

Question 528

Cupola produces __________ iron.

A. Pig
B. Cast
C. Wrought
D. Carbon free

Question 529

Heating of ferromagnetic materials to a temperature above Curie temperature makes it

A. Insulator for heat & electricity transmission
B. Ferritic
C. Behave like paramagnetic materials
D. Superconductor

Question 530

Which of the following is an example of stress corrosion ?

A. Season cracking of brass
B. Caustic embrittlement of steel
C. Both (a) & (b)
D. Neither (a) nor (b)

Question 531

Frost formation on the evaporator tubes in the domestic refrigerators

A. Can be prevented by proper design
B. Decreased compressor power
C. Causes heat loss due to poor heat transfer
D. Is immaterial

Question 532

Parallel straight line pattern of temperature distribution for both hot and cold fluids is observed in case of heat exchanger of the type

A. Parallel flow with equal heat capacities
B. Counter flow with equal heat capacities
C. Counter flow with unequal heat capacities
D. Parallel flow with unequal heat capacities

Question 533

Dryness factor of steam is defined as the ratio of the mass of vapor in the mixture to the mass of the mixture. Dryness factor of steam is measured by a __________ calorimeter.

A. Bomb
B. Throttling
C. Junker's
D. Boy's

Question 534

With increase in compression ratio, the volumetric efficiency of air compressor

A. Increases
B. Decreases
C. Remains same
D. May increase or decrease (depends on the suction pressure)

Question 535

Heat flow across a hollow sphere of inner radius 'r₁' and outer radius 'r₂' is directly proportional to

A. (r₂ - r₁)/(r₁ - r₂)
B. (r₂ . r₁)/(r₂ - r₁)
C. (r₁ + r₂)/(r₁ . r₂)
D. (r₁ . r₂)/(r₁ + r₂)

Question 536

Current employed in resistance welding ranges from __________ kVA/cm² .

A. 1.2 to 2.5
B. 4.5 to 6.2
C. 7.5 to 8.5
D. 10.5 to 15.5

Question 537

Role of a "collector" in froth floatation is to

A. Form a water repelling film on the mineral surface
B. Create and stabilise the froth
C. Act as a surface
D. Collect the minerals according to their specific gravity

Question 538

The escape velocity of a body on earth which is independent of its mass is about __________ km/second.

A. 3
B. 7
C. 11
D. 15

Question 539

For grinding of softer materials, the grinding wheel should have __________ grain size.

A. Finer
B. Coarser
C. Medium
D. Any type of

Question 540

Ganister contains maximum percentage of

A. FeO
B. SiO₂
C. MgO
D. MnO₂

Question 541

Gross national product (GNP) means the total value of __________ in a country.

A. Goods produced
B. Gold reserve
C. Earning of the citizens
D. Taxes paid

Question 542

To counteract the bad effects of strain hardening on a cold formed part, it must be

A. Tempered
B. Normalised
C. Annealed
D. Hardened

Question 543

Out of the following, the rays having the lowest wavelength is the

A. Radio waves
B. Ultrasonic waves
C. Infra red rays
D. X-rays

Question 544

The ultimate strength in tension for steel is __________ times the ultimate strength in shear.

A. 0.5
B. 0.9
C. 1.5
D. 2.5

Question 545

A freely floating object is stable, if its centre of buoyancy

A. Coincides with its centre of gravity
B. Lies below its centre of gravity
C. Lies below its metacentre
D. None of these

Question 546

The rolling process can not be used to produce

A. Plates
B. Rods
C. Tubes
D. Wires

Question 547

Which of the following is used to produce draught in the locomotive boilers ?

A. Chimney
B. Induced draught fan
C. Forced draught fan
D. Steam jet arrangement

Question 548

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

A. Increases the reducing potential of the gas
B. Increases the flame temperature
C. No significant change occurs
D. Increases the hydrogen content in the metal

Question 549

Cassiterite is an ore of

A. Tin
B. Lead
C. Molybdenum
D. Chromium

Question 550

Normalising of an object does not

A. Refine coarse grain structure obtained during hot working
B. Improve ductility
C. Improve yield strength
D. Improve machanical properties

Question 551

Free oxygen is removed from boiler feed water, because it

A. Reduces heat transfer co-efficient
B. Is corrosive
C. Causes explosion
D. None of these

Question 552

Pick out the wrong statement about the machinability of metals. Machinability of a metal

A. Decreases with increase in strain hardening tendencies
B. Decreases with increase in hardness, in general
C. Depends on the composition, microstructure and physical & mechanical properties
D. Decreases with increases in tensile strength & decrease in grain size

Question 553

Common salt is produced from sea water in India generally by the __________ method.

A. Freeze drying
B. Solar evaporation
C. Electrolytic
D. None of these

Question 554

The ability of a substance to assume two or more crystalline structure is called

A. Isomorphism
B. Polymorphism
C. Amorphism
D. Isomerism

Question 555

Out of the following, the lowest packing of atoms exists in __________ crystal lattice structure.

A. Hexagonal close, packed (hcp)
B. Face centred cubic (fcc)
C. Body centred cubic (bcc)
D. Simple cubic

Question 556

Pick out the correct statement

A. Jet engine can work, where there is no atmosphere
B. Rocket engines cannot work, where there is no atmosphere
C. Rocket engines carry oxygen required for the combustion in the form of oxidiser
D. Jet engines also carry oxidiser

Question 557

The 'laughing gas' is

A. Nitrous oxide
B. Nitric oxide
C. Nitrogen trioxide
D. Nitrogen pentoxide

Question 558

Addition of __________ to steel does not impart hardness.

A. Nickel
B. Copper
C. Chromium
D. Silicon

Question 559

Which of the following heat treatment processes is usually applied to castings ?

A. Tempering
B. Annealing
C. Normalising
D. Carburising

Question 560

Gratings is associated with the measurement of

A. Linear displacement
B. Concavity/convexity
C. Surface texture
D. Flatness

Question 561

Annealing of a material does not

A. Permit its further cold working
B. Soften it
C. Case harden it
D. None of these

Question 562

Tumbling is the process of improving the __________ of the materials/parts.

A. Surface finish
B. Fatigue limit
C. Creep limit
D. Surface cleanlineses

Question 563

Which of the following is a disaccharide?

A. Lactose
B. Starch
C. Cellulose
D. Fructose

Question 564

In age-hardenable alloys, maximum ductility is obtained

A. In as cast state
B. Immediately after solution treatment and subsequent quenching
C. After optimum ageing
D. After overageing

Question 565

Minimum temperature upto which water can be theoretically cooled down in the cooling tower by evaporative cooling is equal to the __________ temperature of air.

A. Wet bulb
B. Dry bulb
C. Saturation
D. Dew point

Question 566

An example of unsteady non uniform flow is the flow of liquid under pressure through a

A. Tapering pipe at constant flow rate
B. Tapering pipe at either decreasing or increasing flow rate
C. Long pipeline of constant diameter
D. None of these

Question 567

All radiations falling on a black body are

A. Refracted
B. Reflected
C. Transmitted
D. Absorbed

Question 568

GASOHOL' widely used in Brazil as a motor fuel is a mixture of alcohol and

A. Petrol
B. LPG
C. Light hydrocarbon gases (e.g. butane or propane)
D. None of these

Question 569

Electrostatic separation of minerals from each other is based on their differences in the following property.

A. Densities
B. Magnetic permeabilities
C. Electrical conductivities
D. Hardness

Question 570

The thermodynamic law, PVy = constant, is not followed by the

A. Free expansion of an ideal gas
B. Adiabatic expansion of steam in turbine
C. Adiabatic compression of air
D. Ideal compression of air

Question 571

__________ is a non volatile film forming constituent of a paint.

A. Thinner
B. Dryer
C. Drying oil
D. None of these

Question 572

Often earing defects are found during deep drawing operation, because the

A. Surface finish of the sheet is poor
B. Sheet material has been given substantial spring back
C. Starting sheet has planer anisotropy due to its texture
D. Starting sheet has normal anitropy due to its texture

Question 573

A solar cell converts the sunlight directly into __________ energy.

A. thermal
B. electrical
C. mechanical
D. chemical

Question 574

The main reducing agent in iron blast furnace is

A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air

Question 575

The maximum thickness of the metal which can be welded using ultrasonic welding is __________ mm.

A. 0.5
B. 3
C. 10
D. 25

Question 576

High endurance limit of carburised machine parts is because of the fact that carburisation

A. Suppresses any stress concentration produced in the parts
B. Enhances the yield point of the material
C. Introduces a compressive layer on the surface
D. Produces a better surface finish

Question 577

Silicon crystal can be converted to p-type semi-conductor by doping with

A. Phosphorous
B. Nitrogen
C. Carbon
D. Boron

Question 578

__________ is not a heat treatment process.

A. Cyaniding
B. Pakerising
C. Austempering
D. Martempering

Question 579

The temperature at which ferromagnetic material can no longer be magnetised by the outside forces, is termed as the

A. Critical point
B. Curie temperature
C. Inversion temperature
D. Eutectic temperature

Question 580

Grain hardness is measured by the __________ hardness testing method.

A. Knoop
B. Rockwell F
C. Shore sceleroscope
D. Vicker's

Question 581

Referring to the periodic table of elements, it is found that with increasing atomic number. The atomic size in the same

A. Period increases
B. Period decreases
C. Group increases
D. Both 'b' & 'c'

Question 582

A solution which resists change in its pH value on addition of acid/alkali is called the __________ solution.

A. Neutral
B. Ideal
C. Buffer
D. Zero pH

Question 583

The temperature at which the magnetic property of iron disappears (i.e., it becomes non-magnetic) and its electrical conductivity & specific heat also changes, is called the 'Curie point', which is __________ °C.

A. 768
B. 908
C. 1400
D. 1539

Question 584

Reynolds number of a fluid flowing in a circular pipe is 10000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

A. 9100
B. 13000
C. 7000
D. 2550

Question 585

__________ joint is mostly used for joining pipes carrying water at low pressure.

A. Nipple
B. Socket
C. Union
D. Bell and spigot

Question 586

For infinite parallel planes having emis-sivities ε₁ & ε₂, the interchange factor for radiation from surface 1 to surface 2 is given by

A. (ε₁ + ε₂)/ε₁.ε₂
B. Ε₁.ε₂/(ε₁ + ε₂ - ε₁.ε₂)
C. Ε₁.ε₂
D. Ε₁ + ε₂

Question 587

Sewage is not an excellent medium for the growth of

A. Aquatic creatures
B. Protozoa
C. Virus
D. Pathogenic bacteria

Question 588

While the bin cards are used in the effective stores management, the queing theory is associated with the __________ time.

A. Waiting
B. Idle
C. Inspection
D. Tool replacement

Question 589

Speisses is a mixture of the following:

A. Arsenides of heavy metals
B. Antimonides of heavy metals
C. Arsenides & antimonides of heavy metals
D. Iron, cobalt and nickel

Question 590

Steel balls are manufactured by cold heading. After cold forming, they are subjected to

A. Tempering
B. Normalising
C. Stress-relieving
D. Artificial ageing

Question 591

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

A. Emissivity of pipe surface.
B. Diameter & length of the pipe.
C. Temperature of hot pipe surface & that of air in the room.
D. none of these.

Question 592

Which of the following emissions in the exhaust gas of an I.C. engine causes the formation of photochemical smog?

A. Nitrogen oxides
B. Hydrocarbons
C. Both A & B
D. Carbon monoxide

Question 593

A high pressure boiler generates steam at a pressure greater than __________ kg/cm² .

A. 10
B. 30
C. 50
D. 80

Question 594

Temperature of hot gases flowing in a pipe is measured by a thermocouple inserted in the thermal well. The thermal well made of __________ will facilitate the most accurate measurement of the temperature.

A. Copper
B. Steel
C. Aluminium
D. Brass

Question 595

The most suitable material of construction for a sewer to carry sewage under high pressure is

A. Asbestos cement
B. Steel
C. Cement concrete
D. Stoneware

Question 596

Theoretical volume of oxygen required for complete combustion of 1Nm³ of acetylene, in oxy-acetylene welding is __________ Nm³ .

A. 0.5
B. 1
C. 2
D. 2.5

Question 597

What is the effect on the performance of the economiser in the thermal power plant boiler, if the feed water temperature is very low due to preheaters being out for repairs or starving of steam supply ?

A. It results in corrosion due to the condensation on the flue gas side of the economiser tubes due to handling of low temperature water
B. Economiser tube life increases due to handling of low temperature water
C. Heat transfer efficiency of economiser increases due to picking up high heat from the flue gases
D. Scale formation rate on economiser tubes increases

Question 598

A high pressure boiler generates steam at a pressure greater than __________ kg/cm2 .

A. 10
B. 30
C. 50
D. 80

Question 599

Hot working of lead is carried out at

A. 75°C
B. 373°K
C. 150°C
D. Room temperature

Question 600

In 18-4-1 high speed steel, 18, 4 & 1 respectively denote the percentage of

A. Chromium, tungsten & vanadium
B. Tungsten, chromium & vanadium
C. Tungsten, vanadium & chromium
D. Tungsten, chromium & molybdenum

Question 601

Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10⁻² atm, the partial pressure of B is 10⁻³ atm and the partial pressure of AB is 1 atm, the equilibrium constant 'K' is

A. 10 atmv
B. 10⁵ atm⁻¹
C. 10 (dimensionless)
D. 10⁵ (dimensionless)

Question 602

An abrupt and sudden fall in the readinp of barometer is an indication of the

A. Storm
B. Rain
C. Clear weather
D. Cold wave

Question 603

Principal alloying element in Elinvar (used for making hair springs for watches) is

A. Copper
B. Aluminium
C. Nickel
D. Zinc

Question 604

Cast iron contains __________ percent carbon.

A. 2.5
B. 3.75
C. 4.75
D. 5.25

Question 605

The dew point temperature lines on psychrometric charts are straight inclined sloping downwards to the right. When relative humidity of moist air is 100%, then

A. Wet bulb temperature=dry bulb temperature
B. Wet bulb temperature=dew point temperature
C. Saturation temperature=dew point temperature
D. All of the above

Question 606

Which of the following commonly used condenser tube materials has the lowest thermal conductivity?

A. Admirability brass
B. Stainless steel
C. Aluminium brass
D. Titanium

Question 607

Magnesium addition to cast iron increases its

A. Corrosion resistance
B. Creep strength
C. Ductility and strength in tension
D. Hardness

Question 608

Material of construction of the electrode used in the electric resistance welding is

A. Stainless steel
B. Graphite
C. Copper
D. Steel

Question 609

Existence of velocity potential implies that the fluid is

A. Irrotational
B. Ideal
C. Compressible
D. In continuum

Question 610

Larger length & diameter water pipes are made by

A. Electrical resistance welding
B. Die casting
C. Semi-centrifugal casting
D. Continuous casting

Question 611

Even though heat transfer co-efficients in boiling liquids is large, use of fins is advantageous, when the entire surface is exposed to __________ boiling.

A. Film
B. Nucleate
C. Transition
D. All of the above

Question 612

Transition from laminar to turbulent zone in free convection heat transfer is governed by the critical value of

A. Grashoff number
B. Grashoff number & Reynolds number
C. Reynolds number
D. Grashoff number & Prandtl number

Question 613

Resistance of an electrical conductor is proportional to its (where, l = length and A = cross-sectional area of the conductor)

A. A
B. l
C. A2
D. both 'a' & 'b'

Question 614

During sensible heating of humid air

A. Relative humidity increases
B. Dew point remains constant
C. Dry bulb & wet bulb temperature increases
D. Both 'b' & 'c'

Question 615

Satellites burn off during re-entry to earth's atmosphere, because of the

A. Combustion with air
B. Gravitational pull by earth
C. Friction with earth's atmosphere
D. Loss in weight of the satellite

Question 616

The path and movements followed by men, materials & equipments in executing the activities is indicated by the

A. Travel charts
B. Man-machine charts
C. String diagram
D. Flow diagram

Question 617

If the head is doubled in & centrifugal pump, the power required will increase in the ratio of

A. 23
B. 23/2
C. 25/2
D. 21/3

Question 618

The main function of the deaerator used in the thermal power plant is to

A. Throttle down the steam pressure
B. Enhance feed water temperature
C. Remove dissolved gases from feed-water
D. Remove non-condensable gases from condenser

Question 619

Permanent set in a material is produced by subjecting it to

A. Triaxial loading
B. Fatigue loading
C. Stresses beyond the elastic limit
D. Tensile & compressive loads simultaneously

Question 620

Materials used for making permanent magnets containing iron and nickel are made by __________ technique.

A. Powder metallurgy
B. Casting
C. Forging
D. None of these

Question 621

Function of gear box is to

A. Reduce the speed
B. Obtain variable speed
C. Increase the speed
D. Produce high torque

Question 622

Glass reacts with

A. H₂SO₃
B. HF
C. HNO₃
D. K₂Cr₂O₇

Question 623

Metallic surveying tapes are made of __________ which has a low co-efficient of expansion & enough strength.

A. Invar
B. Hastealloy
C. Duralumin
D. Monel metal

Question 624

Electrochemical corrosion can occur, only if __________ is present in contact with metal.

A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium

Question 625

Which of the following is an acidic constituent of B.F. slag ?

A. SiO₂
B. FeO
C. MgO
D. CaO

Question 626

Malleabilisation heat treatment is performed on

A. Cast steel
B. Grey cast iron
C. White cast iron
D. Spheroidal graphite cast iron

Question 627

Electric arc furnace is employed mainly for the production of __________ steel.

A. High carbon
B. Alloy
C. Mild
D. Plain carbon

Question 628

The trace metal present in insulin is

A. Cu
B. Zn
C. Fe
D. Ni

Question 629

A dense structure of grinding wheel is not used for the

A. Ductile material
B. Hard materials
C. Brittle materials
D. Finishing cuts

Question 630

What is the critical radius of insulation (cms) for a metallic cylinder, if the convective heat transfer co-efficient with the ambient atmosphere is 5 W/m². °K ? Thermal conductivity of metal and insulation material are 40 and 0.1 W/m.°K respectively.

A. 2
B. 5
C. 10
D. 20

Question 631

Which of the following is a weak acid?

A. HF
B. HCl
C. HI
D. HBr

Question 632

Dislocations are __________ defects.

A. Point
B. Line
C. Volume
D. None of these

Question 633

The concentration of (H⁺) ions is 4 x 10⁻⁵ in a solution. Then pH of the solution will be (Given log 4 = 0.6 )

A. 4.4
B. 5.6
C. 8.4
D. 2.4

Question 634

Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.

A. 746
B. 3000
C. 1000
D. 550

Question 635

Which of the following processes follows the hardening process for reducing the hardening strains & increasing the toughness of the steel part?

A. Anodising
B. Tempering
C. Carburising
D. Annealing

Question 636

Air/fuel ratio by weight for combustion of methane with theoretical quantity of air will be about

A. 9:1
B. 17 : 1
C. 23 : 1
D. 29 : 1

Question 637

Shampoos are commercially not available in the form of

A. Powder
B. Gaseous mixture
C. Solution
D. Emulsion

Question 638

Addition of small amount of __________ to grey cast iron is done to produce nodular grey cast iron.

A. Manganese
B. Phosphorous
C. Magnesium
D. Chromium

Question 639

The following thermocouple may be used for measuring temperature upto 1873°K.

A. Chromel-alumel
B. Copper-constantan
C. Platinum-platinum rhodium
D. Iron-constatan

Question 640

The excess air required for the combustion of pulverised coal is of the order of about __________ percent.

A. 5
B. 15
C. 30
D. 45

Question 641

Which of the following gases cause global warming?

A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone

Question 642

Pick out the wrong statement:

A. Soft water is more corrosive than that carrying calcium salts
B. The corrosion of brass condenser tubes handling brine solution is also termed as 'dezincification'
C. Non-annealed brass is highly susceptible to season cracking (i.e., inter-crystal corrosion due to internal stresses)
D. Pure copper is highly susceptible to stress corrosion

Question 643

The critical pressure at which the latent heat of vaporisation of steam becomes zero is __________ Kg/ cm².

A. 273.15
B. 225.65
C. 100.03
D. 373.15

Question 644

In inventory control theory, the economic order quantity (EOQ) is the

A. Lot size corresponding to break even analysis
B. Average level of inventory
C. Optimum lot size
D. None of these

Question 645

Semi-conductors normally employ __________ bonding.

A. Co-ordinate
B. Ionic
C. Covalant
D. Metallic

Question 646

All of the following alloying elements of steel increases hardness but sacrifice ductility, except

A. nickel
B. vanadium
C. molybdenum
D. chromium

Question 647

Which one of the following is incombustible ?

A. H2
B. CCl4
C. C2H2
D. S

Question 648

Yield strength of a polycrystalline metal with an average grain size, d, is proportional to

A. d1/2
B. d-1/2
C. d
D. d-1

Question 649

Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is

A. 38
B. 26
C. 16
D. 4

Question 650

Filler metal is used in __________ welding.

A. Braze
B. Electric spot
C. Projection
D. Seam

Question 651

__________ are not emitted by radioactive substances.

A. Α-rays
B. Β-rays
C. Protons
D. Positrons

Question 652

Coating of zinc over steel is known as

A. Cladding
B. Galvanising
C. Anodising
D. Passivation

Question 653

For a small scale toy factory, the fixed cost per month is Rs. 5000/-. The variable cost per toy is Rs. 20 and sales price is Rs. 30 per toy. The break even production per month will be __________ toys.

A. 250
B. 500
C. 1000
D. 3000

Question 654

The most important material handling system in an integrated steel plant is the

A. Belt conveyor
B. Diesel locomotive
C. Truck
D. Overhead hoists & cranes

Question 655

Internal cracks in drawn bars are due to

A. Secondary tensile stresses
B. Temperature gradient in the work piece
C. Heated dies and grips
D. Internal compressive residual stress

Question 656

The driving force for the sintering of a powder compact is

A. Strain energy
B. Surface energy
C. Volume energy
D. Stacking fault energy

Question 657

Fatigue resistance of a material is measured by the

A. Elastic limit
B. Ultimate tensile strength
C. Young's modulus
D. Endurance limit

Question 658

Pipelines carrying various utilities in chemical industries are identified by their colour codes. The color of pipeline carrying steam is

A. Black
B. Silver grey
C. Green
D. Yellow

Question 659

Property responsible for the talcum powder to cling to the skin is the

A. Capillary action
B. Adhesion
C. Cohesion
D. Surface tension

Question 660

A friction lighter is normally used for lighting gas welding torch, because of the reason that

A. Its initial cost is very low
B. Duration of spark created is very small
C. Safety of welder is ensured
D. It is easier to operate & maintain

Question 661

Which of the following is not used as a bearing material?

A. Copper-lead alloys
B. Babbits
C. Bronzes
D. Cermets

Question 662

Spheriodising of a material is a/an __________ process.

A. Normalising
B. Annealing
C. Tempering
D. Hardening

Question 663

Pick out the wrong statement.

A. Partnership is suitable for medium size business
B. A certain minimum of subscription of capital is required for legally starting a business in a Public Limited Joint Stock Company
C. Public Limited Joint Stock Company is legally bound to issue prospectus after registration
D. A small scale industry is the one, which has a minimum capital investment of Rs. 50 lakhs and maximum 100 lakhs

Question 664

Which of the following if present in iron ore, enhances its value?

A. Alumina
B. Alkali oxide
C. Lime & Magnesia
D. None of these

Question 665

Electrode potential is not concerned with the measurment of

A. PH value
B. Temperature
C. Viscosity
D. Density

Question 666

The hardness of a grinding wheel is specified by the

A. Alphabetical letter
B. Rockwell hardness number
C. Brinell hardness number
D. None of these

Question 667

Percentage of gaunge is maximum in the ore of

A. Iron
B. Gold
C. Zinc
D. Copper

Question 668

Gas turbine normally employs a constant __________ cycle.

A. Pressure
B. Temperature
C. Volume
D. None of these

Question 669

In a furnace with heating element temperature at 1700°C, the dominant machanism of heat transfer will be

A. Conduction
B. Radiation
C. Natural convection
D. Forced convection

Question 670

Out of the following the refractive index is the highest for

A. Glass
B. Diamond
C. Brine
D. Kerosene

Question 671

Water hammer is caused in steam carrying pipelines, because of

A. Partial condensation of steam
B. Vibration of the pipeline
C. High degree of superheat of steam
D. Its exposure to torrential rain

Question 672

Titanium can be easily welded using __________ welding.

A. Submerged arc
B. TIG
C. Shielded metal arc
D. Electroslag

Question 673

Which of the following alloying elements when added in steel does not improve its lachinability?

A. Sulphur
B. Phosphorous
C. Copper
D. Lead

Question 674

The co-ordination number in simple cubic structure is

A. 4
B. 6
C. 8
D. 12

Question 675

Thermal conductivity of a material does not depend upon its

A. Mass
B. Volume
C. Surface area
D. All of the above

Question 676

A colloidal system, in which a liquid is dispersed in gas is called a/an

A. Gel
B. Aerosol
C. Foam
D. Emulsion

Question 677

Which of the following fastening devices has a head at one end and a nut fitted to the other ?

A. Bolt
B. Stud
C. Top bolt
D. None of these

Question 678

Powder metallurgy processing can be used for making

A. Dispersion strengthened copper rod
B. Self lubricating bearing and cemented carbide
C. Connecting rod
D. Piston

Question 679

The phenomenon of strain-ageing is generally experienced with

A. Cast iron
B. Low carbon steel
C. High manganese steel
D. High carbon steel

Question 680

Nusselt number/Biot number varies

A. Inversely with thermal conductivity
B. Directly with heat transfer co-efficient
C. Directly with thermal conductivity
D. Inversely with the dimension of the solid

Question 681

The normal stress is the same in all directions at a point in a fluid, only when the fluid

A. Is at rest & has zero viscosity
B. Is frictionless
C. Fluid layer has no motion relative to an adjacent layer of fluid
D. Is incompressible & frictionless

Question 682

Which of the following relationships is correct for relating the three elastic constants of an isotropic elastic material (where, E = Young's modulus, G = Modulus of rigidity or shear modulus v = Poisson's ratio)?

A. E = 2G (1 + v)
B. E = G (1 + v)
C. E = G (1 + v)/2
D. E = 2G (1 + 2v)

Question 683

The life of a ball bearing is inversely proportional to

A. (load)1
B. (load)2
C. (load)3
D. (load)0.33

Question 684

The minimum and the maximum number of members required to form a Private Limited Joint Stock Company are respectively

A. 7 and 30
B. 10 and 50
C. 2 and 50
D. 13 and 55

Question 685

Density in the solid state is slightly less than that in its liquid state, in case of

A. Carbon dioxide
B. Water
C. Mercury
D. None of these

Question 686

For the irreversible reaction, Ca+ 2C = Ca C₂ , Δ H°298 = - 60000 J . mole⁻¹ . If a system initially containing 2 moles of calcium, 3 moles of carbon and 1 mole of calcium carbide is allowed to react to completion, the heat evolved at 298 K will be

A. 30000 J
B. 60000 J
C. 90000 J
D. 240000 J

Question 687

In case of condensers & evaporators operating under given terminal conditions, LMTD (logarithmic mean temperature difference) for counter flow as compared to that for parallel flow is

A. More
B. Less
C. Equal
D. Much more

Question 688

Pick out the wrong statement.

A. Reflectivity of gases is very low
B. Absorptivity for metals is very high
C. Reflectivity for non-conducting materials is low
D. Reflectivity of polished surfaces is very high

Question 689

The diffusion co-efficient of Ni in Cu at 1000 K is 1.93 x 10⁻¹6⁶ m² . S⁻¹ and it is 1.94 x 10⁻¹⁴ m² S⁻¹ at 1200 K. The activation energy (in k. J.mole⁻¹ ) for the diffusion of Ni in Cu is

A. 130
B. 180
C. 230
D. 250

Question 690

Pick out the wrong statement.

A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'.
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials.
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces.
D. Tungsten steel and alnico are not hard magnetic materials.

Question 691

A coal with high __________ content will ignite most easily.

A. Hydrogen
B. Oxygen
C. Volatile matter
D. Fixed carbon

Question 692

Boiler tube size is specified by its thickness and __________ diameter.

A. Outside
B. Inside
C. Mean
D. None of these

Question 693

Pick out the wrong statement.

A. The X-rays can not be deflected by electric field unlike cathode rays
B. The intensity of X-rays can be measured by ionisation current produced due to the ionisation of gas by X-rays
C. The quality of X-rays can be controlled by varying the anode-cathode voltage
D. Crystal structure of a material can be studied by an electron microscope

Question 694

In the floatation process, pine oil is used as the

A. Collector
B. Activator
C. Frother
D. Depressant

Question 695

Saturated steam at a pressure of 25 kg/cm² is throttled to attain 5 kg/cm² . Then the outcoming steam will be

A. Wet
B. Saturated
C. Superheated
D. None of these

Question 696

In troposphere (the weather domain), the temperature 't' at height 'h' above the sea level in metres is given by (where, temperature at sea level is 15°C and t is in °C.)

A. t = 15 - 0.0065 h
B. t = 15 + 0.0065 h
C. t = 0.0035 h - 15
D. t = 15 - 0.0035 h

Question 697

As per international norms, the maximum permissible value of noise level in the industrial environment is __________ decibels as measured at a distance of 1.5 metres from the source of noise.

A. 110
B. 85
C. 60
D. 45

Question 698

Which of the following rays has the least wavelength?

A. Ultraviolet rays
B. Infrared rays
C. Cosmic rays
D. X-rays

Question 699

Titanium alloys are welded using the Following process:

A. TIG welding
B. Submerged arc welding
C. Butt welding
D. Electron beam welding

Question 700

A semi-conductor is damaged & behaves like a conductor, on passing a strong electric current through it, because it heats up the crystals & breaks the covalant bonds resulting in __________ electrons.

A. Lack of free
B. Excess of
C. Decrease in
D. None of these

Question 701

Stoneware pipes used for sewers for carrying sewage normally is joined by __________ joint.

A. Spigot and socket
B. Flanged iron
C. Collar
D. Expansion

Question 702

Heat dissipation in cooling towers is mainly by

A. Conduction
B. Convection
C. Evaporation
D. Radiation

Question 703

Broaching tools are usually made of

A. Cermets
B. High speed steel
C. Tungsten carbide
D. Stellite

Question 704

__________ of grey cast iron produces white cast iron.

A. Tempering
B. Rapid heating
C. Rapid cooling
D. Slow cooling

Question 705

In electrical resistance welding, distortion results from the use of improper

A. Clamping methods
B. Electrodes
C. Current
D. Filler material

Question 706

Rockwell number represents the

A. Hardness of a substance
B. Colour of a pigment
C. Density of a polymer
D. Active ingredients in a fertiliser

Question 707

Addition of beryllium to copper is done mainly to produce a/an __________ alloy.

A. Non-sparking & non-magnetic
B. High strength
C. Precipitation hardenable
D. Corrosion resistant

Question 708

A boy weighing 110lb climbs up a 50 ft high vertical destination in 100 seconds. Horse power of the boy is __________ hp.

A. 0.1
B. 0.5
C. 0.8
D. 1

Question 709

Most important property of steels for use in automobile bodies is the

A. Formability
B. Yield strength
C. Toughness
D. Resilience

Question 710

Resilience of a material is important, when it is subjected to

A. Creep
B. Fatigue
C. Shock loading
D. Galvanising

Question 711

Toughness of a material is measured by the

A. Vicker's hardness test
B. Scratch test
C. Universal testing machine
D. Notched bar test

Question 712

Work hardenable alloy steel used to make the bucket wheel excavators, blades of bulldozers and other earth moving equipments contain iron, carbon and

A. Manganese
B. Silicon
C. Nickel
D. Chromium

Question 713

Which of the following contributes maximum as main source of sulphur in the blast furnace charge ?

A. Sinter
B. Coke
C. Iron ore
D. Limestone

Question 714

Air refrigeration cycle is used in the air crafts, because of

A. Low temperature encountered at high altitude
B. Its high heat transfer rate
C. Its low unit weight per ton of refrigeration
D. Its higher co-efficient of performance (COP)

Question 715

Springback in sheet metal bending depends on the

A. Elastic limit
B. Bend radius
C. Degree of bend
D. Thickness of sheet

Question 716

The surface tension of a liquid, at critical temperature is

A. Indeterminate
B. Zero
C. Infinity
D. Same as that at any other temperature

Question 717

Which of the following materials does not form adherent oxide film on surface?

A. Copper
B. Nickel
C. Aluminium
D. Gold & silver

Question 718

A material in which the atoms are arranged regularly in some directions but not in others, is termed as 'mesomorphous material'; an example of which is

A. lead
B. glass
C. mica
D. silver

Question 719

Which of the following is the most suitable material of construction for the condenser tubes, where the cooling medium is brine (salty water)?

A. Aluminium
B. Copper
C. Titanium
D. Stainless steel

Question 720

Absolute zero pressure can be attained at a temperature of

A. 0°C
B. 50°K
C. 0°R
D. none of these

Question 721

The substance used as a smoke screen in warfare is

A. C₂H₂
B. SiCl₄
C. P₂O₅
D. PCl5

Question 722

The elastic strain energy of a unit length of an edge dislocation as compared to that of a screw dislocation is

A. More
B. Equal
C. Less
D. Double

Question 723

Solution loss reaction occurs

A. In the blast furnace shaft
B. During pretreatment of hot metal
C. In the L.D. process
D. During deoxidation in the ladle

Question 724

Pick out the correct combination about the role of various additives used in polymers.

A. Plasticiser : increases the polymer strength
B. Heat stabiliser : increases the maximum service temperature
C. Fillers: Does not affect the property of polymer but increases its weight
D. Lubricants: increases the flexibility of polymers

Question 725

An ideal fluid is

A. Viscous & incompressible
B. Non-viscous & compressible
C. Non-viscous & incompressible
D. Viscous & compressible

Question 726

The power of a low capacity prime mover is most suitably measured by a __________ type dynamometer.

A. Driving
B. Transmission
C. Absorption
D. None of these

Question 727

Half life of a radioactive isotope corresponds to the time required for half of the __________ to decay.

A. Atoms
B. Neutrons
C. Nucleons
D. Electrons

Question 728

Which of the following is the terminology used for the temperature at which the phase changes occur in a metal ?

A. Critical temperature
B. Recrystallisation temperature
C. Phase transformation temperature
D. Transition temperature

Question 729

Metal shots used in shot blasting are made of

A. Stellite
B. Steel
C. Bronze
D. Lead

Question 730

In an isochoric process,

A. There is no transfer of mass and energy
B. Free expansion of an ideal gas occurs
C. No mechanical work is done by the system
D. All of the above

Question 731

1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).

A. 10000
B. 1000
C. 100
D. 10

Question 732

One ton of refrigeration is not equivalent to the heat removal rate of

A. 200 BTU/minute
B. 50 kcal/minute
C. 50 kJ/sec
D. 3.5 KW

Question 733

The majority charge carriers in p-type silicon are

A. Free electrons
B. Ions
C. Conduction electrons
D. Holes

Question 734

Vernier calipers can not be used to measure the

A. I.D. & O.D. of the shaft
B. Thickness of parts
C. Depth of holes
D. Clearance between two mating surfaces

Question 735

Which of the following is categorised as the plastic welding?

A. Gas welding
B. Electric arc welding
C. Forge welding
D. None of these

Question 736

Which of the following is not the function of a volute casing provided in a centrifugal pump?

A. To reduce the head loss in discharge
B. To increase the pump efficiency
C. To collect liquid from the periphery of the impeller and to transmit it to the delivery pipe at constant velocity
D. To increase the pump discharge rate

Question 737

In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following :

A. Jet of water at high pressure
B. Blast of air
C. Mixture of water and air
D. Rain of molten lead

Question 738

A metal having a Poisson's ratio = 0.3 is elastically deformed under uniaxial tension. If the longitudinal strain = 0.8, then the magnitude of thickness strain is

A. -0.8
B. 0.8
C. 0.08
D. -0.24

Question 739

Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.

A. Flanged iron
B. Collar
C. Flexible
D. Expansion

Question 740

Lubrication is done to control

A. Friction
B. Wear
C. Temperature
D. All of the above

Question 741

As per the Indian boiler regulation (IBR), the type of joint preferred for the circumferential joint is the __________ joint.

A. Butt
B. Lap
C. Welded
D. None of these

Question 742

With increase in temperature, the electrical conductivity of semiconductors

A. Increases
B. Decreases
C. Remain constant
D. Either A or B, depends on the type of semi-conductor

Question 743

Which of the following has the highest density and the lowest melting point ?

A. Stainless steel
B. Titanium
C. Lead
D. Aluminium

Question 744

Pick out the wrong statement. If the net positive suction head (NPSH) requirement of a pump is not satisfied, then

A. It will deliver low discharge of liquid
B. Its efficiency will not be affected
C. It will not develop sufficient head to raise water
D. It will be cavitated

Question 745

Cobalt - 60 is used as a source of __________ in medical therapy & industrial radiography.

A. X-rays
B. γ-rays
C. α-rays
D. β-rays

Question 746

__________ glass is used in the mercury in glass thermometer meant for measuring a temperature of 500°C.

A. Borosilicate
B. High silica
C. Supermax
D. Lead

Question 747

Specific gravity of hot metal (pig iron) is __________ times that of the blast furnace slag.

A. 2
B. 3
C. 0.8
D. 6

Question 748

Out of the following, which will fracture most readity, when hit with a hard hammer ?

A. Brass
B. Bronze
C. German silver
D. Cast iron

Question 749

Pick out the wrong statement.

A. Both annealing and normalising release the internal stresses of the material besides improving the mechanical properties
B. Low carbon steel does not respond to the heat treatment for hardening of the material, hence it is subjected to case hardening or surface hardening processes like cyniding, carburising, nitriding etc.
C. Induction hardening and flame hardening techniques are also used for surface hardening
D. Martempering of a material is a hardening process

Question 750

A steam pipe is intended to be insulated with two layers of insulating materials of different thermal conductivities. For minimum heat transfer to take place

A. The better insulation material should be put just next to pipe (i.e., inside)
B. The better insulating material should be put outside
C. Either of the insulating material could be put on either side
D. Steam temperature is considered before deciding as to which insulating material is to be put inside (i.e., just next to the pipe)

Question 751

Presence of sulphur in steel reduces the

A. Hardness
B. Grain size
C. Tensile strength
D. Toughness & transverse ductility

Question 752

No cutting fluid is normally used, while machining

A. Cast iron
B. Aluminium
C. Mild steel
D. Stainless steel

Question 753

Commonly employed coolant for high pressure turbogenerator is

A. Air
B. Carbon dioxide
C. Hydrogen
D. Water

Question 754

Young's modulus of a material is the measure of its

A. Stiffness
B. Malleability
C. Creep resistance
D. Tensile strength

Question 755

Which of the following is not used as a fuel in rocket propellaht ?

A. Liquid hydrogen
B. Liquid oxygen
C. Liquid hydrazine
D. Kerosene oil

Question 756

If a solid is compressed adiabatically in its elastic range, its __________ remains constat

A. Internal energy
B. Enthalpy
C. Entropy
D. Temperature

Question 757

__________ circuit is most commonly used to measure strain with the help of a strain gauge.

A. Ballast
B. Voltage balancing potentiometric
C. Simple current sensitive
D. None of these

Question 758

Salvage value is the most flexible criteria for analysing a financial investment. 'Salvaging' means

A. Disposing off a machine/property on as is where is basis
B. Disposing off machine/property, which is no longer useful in the present scenerio
C. Mortgaging the obsolete machine/property
D. Writing off the obsolete machine/ property

Question 759

__________ is the hardest oxide and is hence used where high wear resistance at high temperature is required.

A. Beryllia
B. Zirconia
C. Alumina
D. Magnesia

Question 760

Draft allowance given to patterns is for

A. Compensating the liquid state shrinkage
B. Easy removal of pattern from the mold cavity
C. Providing support for the core placement
D. Compensating the solidification shrinkage

Question 761

Lead is added to 60:40 brass primarily to improve

A. Machinability
B. Corrosion resistance
C. Fluidity
D. Strength

Question 762

Natural water contains approximately __________ percent of heavy water.

A. 0.015
B. 0.71
C. 1.2
D. 3.5

Question 763

Break even point represents the condition, when the company runs under no profit no loss condition. In break even analysis, total cost comprises of fixed cost

A. Only
B. Plus variable cost
C. Plus overhead cost
D. Plus selling expenses

Question 764

Which of the following is the most suitable abrasive for grinding high tensile strength materials?

A. Silicon carbide
B. Corundum
C. Aluminium oxide
D. Boron carbide

Question 765

The condition of diffraction from a crystal is given by

A. nλ = 2d Sin θ
B. λ = d Sin 2θ
C. λ = 2d Sin 2θ
D. nλ = d Sin θ

Question 766

The property of material, by which a given amount of energy is absorbed by it without plastic deformation, is called the

A. Resilience
B. Toughness
C. Ductility
D. Impact strength

Question 767

Moist air is cooled along the line of constant __________ , when it is passed over a cold & dry cooling coil, such that no condensation occurs.

A. Enthalpy
B. Relative humidity
C. Wet bulb temperature
D. Dew point temperature

Question 768

Ferromagnetic material owe their properties to __________ inner sub-shells.

A. Completely filled
B. Partially filled
C. Equally filled
D. Vacant

Question 769

Commonly used flux for brazing is

A. Zinc chloride
B. Borax
C. Ammonium chloride
D. Rosin

Question 770

Air intake for an air compressor should be preferably taken from

A. A site, where cooling towers are located nearby
B. A site, where open coal yard in located nearby
C. An air conditioned room maintained at a temperature of 18°C
D. An outside atmosphere at 10°C

Question 771

Maximum heat dissipation occurs from a steel wire (k = 0.5 W/m. k) of 15 mm diameter exposed to air (h = 20W/m² .k), when the insulation thickness is __________ mm.

A. 15
B. 25
C. 10
D. 30

Question 772

Cryogenics' is concerned with the generation & use of low temperature in the range of

A. 0°K to 123°K
B. 0°C to - 123°C
C. 0°C to - 273°C
D. 0°K to 273°K

Question 773

The malleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the maximum malleability ?

A. Lead
B. Copper
C. Aluminium
D. Wrought iron

Question 774

Isotropic materials have the same __________ in all the directions.

A. Thermal properties
B. Elastic properties
C. Stresses
D. All of the above

Question 775

Refrigerative cooling employed during long distance transportation of food stuffs is normally done by

A. Ice
B. Liquid nitrogen
C. Liquid oxygen
D. Vacuum evaporation

Question 776

Notched bar test is used for testing the __________ of a material.

A. Impact strength
B. Endurance limit
C. Machinability
D. Corrosion resistance

Question 777

Compressed dry air is used as the cutting fluid, while machining

A. Steel
B. Cast iron
C. Aluminium
D. None of these

Question 778

Which of the following metals is not subjected to electrolytic refinning/purification?

A. Copper
B. Zinc
C. Tin
D. Aluminium

Question 779

Impeller & casing of centrifugal pump handling corrosive liquid and frequently running under cavitation condition is most prone to __________ corrosion.

A. Uniform
B. Oxygen diffusion
C. Pitting
D. Inter-granular

Question 780

The following type of bonding is strongly directional in solids.

A. Vander Waal's
B. Ionic
C. Metallic
D. Covalant

Question 781

When metals are heated to high temperature, their __________ increases in general.

A. Atomic vibration
B. Creep strength
C. Yield stress & ultimate tensile strength
D. Toughness & stiffness

Question 782

The only suitable method for hardening the low carbon steel is case hardening. Which of the following is a case hardening process?

A. Cyaniding
B. Sheardising
C. Spherodising
D. None of these

Question 783

The entropy change for a spontaneous process is

A. > 0 for the system
B. < 0 for the system
C. > 0 for the system & the surrounding
D. < 0 for the system & the surrounding

Question 784

The tensile load-elongation curve of a metal does not describe

A. Work hardening
B. Yield stress
C. Anisotropy index
D. Necking strain

Question 785

Powder metallurgy technique is used in the production of __________ tools.

A. Tungsten carbide
B. High carbon steel
C. High speed steel
D. Drilling

Question 786

Optical activity is a/an __________ property.

A. Additive
B. Constitutive
C. Both A & B
D. Neither A nor B

Question 787

Pick out the wrong statement about a fast breeder reactor.

A. Uses molten sodium as moderator
B. Converts fertile fuel into fissile fuel
C. Requires highly enriched fuel
D. Produces more fuel than it consumes

Question 788

Copper deposits are found in India at the following location:

A. Kudremukh
B. Kolar
C. Khetri
D. Ramagundam

Question 789

Which of the following are considered applications of ultrasonic testing ?

A. Determination of elastic constant
B. Detection of defects in metal
C. Measurement of material thickness
D. None of the above

Question 790

Largest application of laser welding is in __________ welding.

A. Microspot
B. Under water
C. Precious metals
D. Heavy structure

Question 791

The most commonly used moderator in nuclear power plants is

A. Graphite
B. Light water
C. Heavy water
D. Berellium

Question 792

A __________ type pressure sensing element is commonly used in aneroid barometer.

A. Capsule
B. Bellow
C. Spiral tube
D. Flat diaphragm

Question 793

Maximum amount of thermal radiation is emitted at all wavelengths at any specified temperature by a/an __________ body.

A. grey
B. black
C. opaque
D. white

Question 794

It is possible to form martensite

A. Sometimes by cold working
B. Sometimes without nucleation
C. Sometimes by gas quenching
D. Only in iron based alloys

Question 795

The radioactive isotope of hydrogen is

A. Deuterium
B. Tritium
C. Protium
D. None of these

Question 796

Mho's scale of hardness, which consists of 10 standard minerals is used for the measurement of __________ hardness.

A. Scratch
B. Indentation
C. Dynamic
D. Rebound

Question 797

Dew point temperature always gives an indication of the __________ of the moist air.

A. Dryness
B. Moisture content
C. Coolness
D. Latent heat

Question 798

Desert air coolers being rendered ineffective in rainy season is due to

A. Low humidity
B. Low temperature
C. High humidity
D. Sunny weather

Question 799

Pick out the wrong statement.

A. A ferromagnetic material becomes paramagnetic above the 'Curie temperature'
B. Permanent magnets are made of hard materials, whereas electromagnets require soft magnetic materials
C. Soft magnetic materials (e.g., pure iron) have higher permeability and low hysterisis loss and coercive forces
D. Tungsten steel and alnico are not hard magnetic materials

Question 800

Which of the following is not a natural abrasive?

A. Silicon carbide
B. Quartz
C. Corundum
D. Emery

Question 801

In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is __________ °C.

A. 20
B. 60
C. 120
D. ∞

Question 802

Statistical quality control was developed by __________ , an American scientist during world war II.

A. Water shewhart
B. Fredric Taylor
C. John Wright
D. Woolmer

Question 803

The lightest non-inflammable gas is

A. H₂
B. He
C. Ar
D. O₂

Question 804

Lap joints are preferred over butt joints in soldering/brazing, because these joints are

A. Weaker in tension but stronger in shear
B. Weaker in shear but stronger in tension
C. Stronger in both shear and tension
D. The lap joints are easily made

Question 805

The minimum temperature to which the water can be cooled in a cooling tower is the __________ temperature of air.

A. Ambient
B. Dry bulb
C. Dew point
D. Wet bulb

Question 806

Non-ferrous alloys used for making cutting tools need not have high

A. Abrasion resistance
B. Toughness
C. Red hardness
D. Cutting speed

Question 807

In fluid flow, and heat and mass transfer, one encounters (i) kinematic velocity (μ), (ii) molecular diffusivity (θ) and thermal diffusivity (α). The units of these quantities are.

A. μ , α and θ all have units of m/s
B. μ , α and θ all have units of m²/s
C. α and θ have units of m²/s, while μ has unit of m/s
D. α and θ have units of m/s, while μ has unit of m²/s

Question 808

__________ is not used as the control rod material in a nuclear reactor.

A. Cobalt
B. Hafnium
C. Cadmium
D. Boron

Question 809

α-rays are

A. Negatively charged
B. Positively charged
C. Neutral
D. Same as X-rays

Question 810

The most prominent single cause of corrosion in boilertubes, drums, economisers and steam superheaters in a thermal power plant boiler is the

A. Water alkalinity & leakage
B. Hydrazine addition during feed water treatment
C. Release of non-condensable gas from water in the boiler
D. Scale formation

Question 811

Carnot cycle is also termed as the constant __________ cycle in thermodynamics.

A. Entropy
B. Pressure
C. Volume
D. Heat

Question 812

A thermally thin body is the one for which

A. Biot number is less than 0.1
B. Gallileo number is less than 0.1
C. Fourier number is less than 0.1
D. Fourier number is greater than 0.1

Question 813

Which of the following does not come under the category of electrochemical corrosion?

A. Corrosion in organic liquids
B. Atmospheric corrosion in moist gas or air
C. Soil corrosion as in the case of underground pipes
D. Corrosion in sea water and molten metals

Question 814

The swift cup test evaluates the following property of a sheet metal.

A. Stretchability
B. Drawability
C. Bendability
D. None of these

Question 815

Drossing is a __________ operation.

A. Smelting
B. Dressing
C. Roasting
D. Dressing

Question 816

Hypo (sodium thiosulphate) because of its complex forming behaviour is used in photography to remove undecomposed silver bromide as a soluble complex for __________ of the picture.

A. Printing
B. Developing
C. Colour
D. Fixation

Question 817

Use of water as a manometric liquid suffers from the disadvantage of its

A. Low vapour pressure
B. Corrosive nature
C. High vapour pressure
D. High boiling point

Question 818

Pick out the wrong statement.

A. Weldability of high carbon steel is poorer compared to low carbon steel
B. Invar is a magnetic alloy
C. Magnetic permeability of the diamagenetic material is less than one
D. Martensitic transformation never goes to complection ( i.e., 100%) at room temperature

Question 819

Silicon in steel

A. Makes it usable in almost all magnetic circuits where alternating current is used
B. Increases its electrical resistivity and decreases the hysteresis loss
C. Is present upto 5% & 4% respectively when used in transformers & motor armatures
D. All of the above

Question 820

The unit of gc is

A. lbm/lbf . ft/seC₂
B. lbf/lbm . ft/seC₂
C. lbm/lbf . seC₂/ft
D. lbf/lbm . seC₂/ft

Question 821

In multipass welds, shot peening is done after each pass to

A. Close the surface porosity
B. Break the continuity of columnar grains
C. Flatten the weldment
D. Introduce texture in the weld

Question 822

__________ of hard alloy and tool steel is done to make it easily machinable.

A. Case carburising
B. Tempering
C. Normalising
D. Annealing

Question 823

With increase in temperature, the electrical conductivity of a __________ decreases.

A. Semi-conductor
B. Metal or alloy
C. Dielectric
D. None of these

Question 824

Surface tension is due to the __________ forces.

A. Viscous
B. Adhesive
C. Cohesive
D. All of these

Question 825

Number of electrons in the outermost orbit of a semi-conductor is

A. 2
B. 4
C. 6
D. 8

Question 826

In which of the following reactions, application of vacuum will help ?

A. Number of gas molecules in the product side is more than that on the reactant side
B. Number of gas molecules in the reactant side is more than that on the product side
C. Number of gas molecules are the same on both the reactant & the product side
D. None of the above

Question 827

Material of construction of surveying metallic tapes is __________ which has low coefficient of expansion & enough strength.

A. Constantan
B. Invar
C. Pewter metal
D. Monel metal

Question 828

The hydraulic radius of a circular pipe of diameter 'd' flowing full is

A. D/4
B. D/2
C. 2d/3
D. D/3

Question 829

Silicon percentage in silicon steel used for electrical equipments is about

A. 1
B. 4
C. 8
D. 14

Question 830

Nickel is a __________ material.

A. Ferromagnetic
B. Semi-conductor
C. Paramagnetic
D. Ferroelectric

Question 831

Projection welding & stud welding is categorised as the __________ welding.

A. Pressure
B. Thermit
C. Resistance
D. Arc

Question 832

Coating thickness in case of galvanising of steel sheet generally corresponds to the deposition of __________ gms of zinc per m² of steel strip.

A. 5-10
B. 1000-1500
C. 120-500
D. 1500-3000

Question 833

Carbide tipped cutting tools are manufactured by powder metallurgy techniques and have a composition of

A. 90% tungsten carbide and 10% cobalt
B. 70% aluminium oxide & 30% silica
C. 30% nickel, 15% chromium & 55% tungsten
D. 65% tungsten & 35% zirconium

Question 834

Limestone is added in the blast furnace (during pig iron manufacture) to

A. Form slag by combining with impurities
B. Supply heat by undergoing exothermic reaction with impurities
C. Reduce the coke consumption
D. Reduce slag viscosity

Question 835

With increasing carbon percent in steel beyond 0.8%, its ultimate tensile strength (UTS) and __________ is not affected.

A. Impact strength
B. Percent elongation
C. Hardness
D. Both B & C

Question 836

Which of the following phenomenon/ phenomena is/are diffusion controlled ?

A. Dislocation climb
B. Cross-slip
C. Twinning
D. Recrystallisation

Question 837

The basic function of the drum in a boiler is to

A. Act as a storage for feed water
B. Act as a storage for steam
C. Separate steam from water
D. Remove settling impurities from steam

Question 838

Inertial forces are obtained, when the elastic forces are multiplied by __________ number.

A. Mach
B. Froude
C. Reynolds
D. Euler

Question 839

The reductant used in the extraction of magnesium from calcined dolomite via Pidgeon's process is

A. Pure carbon
B. Pure silicon
C. Ferro silicon
D. Ferro manganese

Question 840

Dezincification is a form of corrosion, which specifically applies to

A. Steel
B. Brass
C. Stainless steel
D. Babbit metal

Question 841

Auto collimator is used to check

A. flatness
B. angle
C. rotor balancing
D. roughness

Question 842

The elastic strain in copper is due to the

A. Motion of dislocations
B. Stretching of atomic bonds
C. Breakage of atomic bonds
D. None of the above

Question 843

Which of the following transducers is most commonly used for the measurement of shock and vibration ?

A. Linear variable differential transducer (LVDT)
B. Dial gauge
C. Accelerometer
D. None of these

Question 844

Protection of ship hulls against sea water corrosion is done by coating with zinc because of the fact that zinc compared to iron is

A. Reduced preferentially
B. Cheaper
C. Oxidised preferentially
D. Lighter

Question 845

The most important requirement for aluminium industry is the availability of cheap

A. Ore
B. Electrical power
C. Labour
D. & abundant water

Question 846

What happens, when SO₂ is passed through a solution of H₂S in water?

A. Precipitation of sulphur takes place
B. H₂SO₃ is formed
C. Oleum is formed
D. None of these

Question 847

Which of the following is a neutral flux used in the pyrometallurgy of metal extraction?

A. Quartz
B. Flourspar
C. Dolomite
D. Manganese ore

Question 848

Piezoelectric is a material

A. Whose properties is midway between the constituent materials
B. Which gets polarised, when stressed
C. In which magnetising force reduces when current flowing through it is in-cresed
D. Which changes dimensions due to applied field

Question 849

Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms.

A. 20
B. 80
C. 120
D. 500

Question 850

Pick out the wrong statement.

A. Dry bulb temperature, wet bulb temperature & dew point are the same in case of saturated air
B. Dew point is reached by cooling the humid air at constant moisture content
C. Heating of humid air is done for its dehumidification
D. None of these

Question 851

The expected efficiency of a single rivetted lap joint is of the order of 50%. If the thickness of the plate is increased four times, then the rivet diameter will have to be increased __________ times.

A. Two
B. Four
C. Six
D. Eight

Question 852

Pick out the wrong statement about nucleate boiling.

A. Bubble generation is by expansion of entrapped gas/vapour at small cavities in the surface
B. Surface temperature is greater than the saturation temperature of the liquid
C. Heat transfer from the surface of the liquid is less than that in film boiling
D. The temperature is less than that of film boiling

Question 853

Dew point of air indicates its

A. Moisture content
B. Dryness
C. Latent heat
D. Coolness

Question 854

Which of the following metals can be extracted from its ore by both pyrometallur-gical as well as hydrometallurgical methods ?

A. Copper
B. Zinc
C. Both A & B
D. Neither A nor B

Question 855

__________ is used as a material of construction for the blade of power saw.

A. Wrought iron
B. Stainless steel
C. Mild steel
D. High speed steel

Question 856

In the diving apparatus, helium is used along with oxygen, because it is

A. Easily available
B. Not soluble in blood at high pressure
C. Lighter than nitrogen
D. Completely miscible with oxygen

Question 857

Pick out the wrong conversion of absolute & kinematic viscosities.

A. 1 stoke = 1 cm²/sec
B. 1 N.sec/m² = 10 paise
C. 1 stoke = 1 m²/sec
D. 1 m²/sec = 10⁴ stokes

Question 858

Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process?

A. Galvanising
B. Tinning
C. Sheardising
D. None of these

Question 859

Titanium is produced by __________ of Ti Cl₄.

A. Electrolytic reduction
B. Calcium reduction
C. Magnesium reduction
D. Thermal dissociation

Question 860

Which of the following is not an ore of iron?

A. Chalcopyrite
B. Magnetite
C. Hemetite
D. Limonite

Question 861

Presence of sulphur in the fuel fired in a furnace

A. Contributes to its heating value
B. Helps in electrostatic precipitation of ash from flue gases
C. Corrodes ducts & air preheater, if the flue gas temperature is low
D. All of the above

Question 862

Evaporative cooling process employs a combination of cooling and humidification in which the

A. sensible heat is added.
B. sensible heat is removed and the latent heat is added.
C. latent heat is removed.
D. sensible heat is added and latent heat is removed.

Question 863

Iron has got __________ isotopes.

A. No
B. Four
C. Three
D. Two

Question 864

Monazite deposits constitute an important source for the following metal.

A. Thorium
B. Titanium
C. Molybdenum
D. None of the above

Question 865

Pick out the correct statement.

A. A base is always soluble in water
B. Hydrogen is released whenever a metal reacts with an acid
C. Sodium hydroxide is both a base and an alkali
D. All of the above

Question 866

According to maximum shear stress failure criterion, yielding in material occurs, when the maximum shear stress is equal to __________ times the yield stress.

A. 0.5
B. 2
C. √2
D. √3/2

Question 867

Which of the following is the most suitable for removing fine particles (< 1 micron diameter) from air below its dew point?

A. Venturi scrubber
B. Electrostatic precipitator
C. Cyclone separator
D. Fabric filter

Question 868

LVDT used for displacement measurement is a/an __________ transducer.

A. Passive
B. Active
C. Capacitive
D. None of these

Question 869

Powder metallurgy is used to produce

A. High precision components with complex cavities and sharp features
B. Components of large size
C. Porosity free components
D. Components of such alloys whose constituents do not form alloys readily

Question 870

The primary strengthening mechanism in 70 : 30 brass is the

A. Solid solution strengthening
B. Precipitation hardening
C. Dispersion strengthening
D. Order hardening

Question 871

Grey cast iron (used for making underground water pipes and manhole covers) as compared to steel has higher

A. Ductility
B. Impact strength
C. Machinability
D. Melting point

Question 872

The materials which fracture even at small strains are termed as brittle, while those materials which exhibit an appreciable deformation before failure are termed as

A. Rigid
B. Tough
C. Ductile
D. Plastic

Question 873

Fog is an example of colloidal system of

A. solid dispersed in gas.
B. solid dispersed in liquid.
C. liquid dispersed in gas.
D. gas dispersed in liquid.

Question 874

Cementite is in the lamellar form in the __________ phase of steel.

A. Martensitic
B. Bainitic
C. Pearlitic
D. Ferritic

Question 875

Specific heat of an ideal gas depends upon its

A. Molecular weight
B. Pressure
C. Temperature
D. Volume

Question 876

Pick out the wrong statement.

A. Copper is the metal having the highest electronic conductivity
B. Hardenability & weldability of metals are inversely related
C. Covalant bonding formed by sharing of electrons is present in all semi-conductor materials
D. Glass transition temperature applies to 'polymers' but not to 'glasses'

Question 877

__________ test is the appropriate test to determine whether a material is ductile or brittle.

A. Impact
B. Cupping
C. Hardness
D. Tensile

Question 878

A furnace is made of a refractory brick wall of thickness 0.5 metre and thermal conductivity 0.7 W/m.°K For the same temperature drop and heat loss, this refractory wall can be replaced by a layer of diatomaceous earth of thermal conductivity 0.14 W/m.K and thickness __________ metre.

A. 0.01
B. 0.1
C. 0.25
D. 0.5

Question 879

Speed of a submarine in deep sea & that of an aeroplane is measured by a/an

A. Pitot tube
B. Hot wire anemometer
C. Rotameter
D. Stroboscope

Question 880

Fire on fuel oil lines can be extinguished by

A. Foam
B. Steam
C. Water
D. Carbon dioxide

Question 881

Angular displacement can be measured suitably by a

A. Shaft encoder
B. Linear variable differential transducer (LVDT)
C. Stroboscope
D. Tachometer

Question 882

Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)

A. 1/k
B. k
C. k²
D. 1/k²

Question 883

Oxide layer formed on the non-ferrous metal surface after its annealing is

A. Removed by acid pickling
B. Hammered into the surface
C. Removed with coarse emery cloth
D. Left as such to protect the surface

Question 884

On-off control

A. Fully opens the final control element, when the measured variable is below the set point
B. Fully closes the final control element, when the measured variable is above the set point
C. Is a two position control (fully open or fully closed) control adequate to control a process with slow reaction and minimum dead time or transfer lag
D. None of these

Question 885

Age hardening is connected with

A. Babbit metal
B. Gun metal
C. Stainless steel
D. Duralumin

Question 886

Unit molar solution of __________ is the best conductor of electricity.

A. Sodium chloride
B. Acetic acid
C. Sulphuric acid
D. Sucrose

Question 887

Expansion device used in a window air-conditioner is a/an

A. Automatic expansion valve
B. Thermostatic expansion valve
C. Float valve
D. Capillary tube

Question 888

The process of removal of scale formed during hot rolling of steel is termed as

A. Descaling
B. Shot blasting
C. Pickling
D. Skimming

Question 889

The activity of pure hydrogen gas at 1000°C and 5 atm pressure

A. Is always less than 1
B. Is always greater than 1
C. Can be 5
D. Depends on the choice of the standard state

Question 890

Chlorine acts as a bleaching agent only in the presence of

A. Dry air
B. Pure oxygen
C. Moisture
D. Sunlight

Question 891

With increase in pressure, the saturation temperature of steam

A. Increases rapidly first and then slowly
B. Increases slowly first and then rapidly
C. First increases and then decreases
D. None of these

Question 892

Desalination of water

A. Makes it potable
B. Makes it non-potable
C. Means distillation of water
D. None of these

Question 893

X-rays are

A. Positively charged
B. Negatively charged
C. Neutral
D. Of higher wavelength than visible light

Question 894

A psychrometer does not measure the __________ temperature of moist air.

A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these

Question 895

Specific __________ is a dimensionless quantity.

A. Heat
B. Humidity
C. Weight
D. None of these

Question 896

The ratio of the shear stress to the principal stress on a principal plane is

A. 0
B. 1
C. 1-2
D. 1-3

Question 897

Which of the following is termed as the boiler mounting ?

A. Feed water pump
B. Steam superheater
C. Blow off cock
D. Economiser

Question 898

Which of the following will resist maxi-mum shock & vibration without cracking?

A. Grey cast iron
B. White cast iron
C. Malleable iron
D. Graphite

Question 899

Which of the following metals can not be hot worked at room temperature?

A. Zinc
B. Nickel
C. Lead
D. Tin

Question 900

The leg of a barometric leg pump is longer than the Toricellian leg, which is about __________ metres.

A. 1
B. 5
C. 34
D. 10

Question 901

Even minute presence of impurities in copper impairs its electrical conductivity seriously. Electrolytic refinning of blister copper is resorted to, when

A. Cheap electricity is available
B. The precious metal content of copper is high
C. There is a demand for ultrapure (99.99%) electrolytic copper
D. All of the above

Question 902

Disposable patterns are made of

A. Metal
B. Polystyrene
C. Rubber
D. Wood

Question 903

Pick out the wrong statement.

A. Complete unity of command exists in a line organisation
B. Line organisation is net suitable for expansion and growth of an industry
C. In line and staff organisation, "line" executes and "staff directs
D. None of these

Question 904

Which of the following is a unit of time ?

A. Barn
B. Light year
C. Angstrom
D. None of these

Question 905

The boiling & freezing points on a newly defined temperature scale in degree 'D' are 400°D & 100°D respectively. The temperature reading corresponding to 60°C on this new temperature scale will be equal to __________ °D.

A. 140
B. 180
C. 240
D. 280

Question 906

Fog is an example of colloidal system of

A. Solid dispersed in gas
B. Solid dispersed in liquid
C. Liquid dispersed in gas
D. Gas dispersed in liquid

Question 907

Fahrenheit and Centigrade scales have the same readings at

A. -55°
B. -40°
C. -33°
D. -58°

Question 908

Heating of an ore below its melting point in presence of excess of air is called

A. Calcination
B. Smelting
C. Roasting
D. Sublimation

Question 909

Exposure to __________ accelarates the degradation of plastics.

A. Ultraviolet radiation
B. High atmospheric temperature
C. High ambient temperature
D. Damp atmosphere

Question 910

Factor of safety in machine design is defined as the ratio of ultimate stress to __________ stress.

A. Working
B. Bearing
C. Yield
D. None of these

Question 911

Which of the following accounts for maximum loss of energy in a coal fired boiler?

A. Incomplete combustion of fuel
B. Outgoing flue gases
C. Radiation heat losses
D. Unburnt carbon in ash

Question 912

Which of the following material handling equipments is not suitable for moving materials in varying paths?

A. Hand trolley
B. Belt conveyor
C. Crane
D. Truck

Question 913

The maximum value, which the residual stress in a material can reach is the __________ of the material.

A. Elastic limit
B. Plastic limit
C. Yield stress
D. Breaking stress

Question 914

With increase in steam pressure, its specific volume decreases

A. Rapidly first and then slowly
B. Linearly
C. Slowly first and then rapidly
D. Exponentially

Question 915

Joule-Thomson co-efficient is the ratio of

A. Pressure change to temperature change occuring during adiabatic compression of a gas
B. Pressure change to temperature change occuring during adiabatic throttling of a gas
C. Temperature change to pressure change occuring during adiabatic compression of a gas
D. Temperature change to pressure change occuring during adiabatic throttling of a gas

Question 916

Thermoplastics are never moulded using

A. Injection moulding
B. Blow moulding
C. Extrusion
D. Compression moulding

Question 917

Aluminium oxide (an abrasive) is used for grinding

A. Ceramics
B. High speed steel
C. Cemented carbide
D. None of these

Question 918

Methyl orange indicator turns

A. Orange yellow in alkaline medium
B. Orange yellow in acidic medium
C. Colourless in acidic medium
D. Colourless in basic medium

Question 919

Work study deals with the __________ study.

A. Time
B. Motion
C. Both A & B
D. Neither A nor B

Question 920

The ratio of thermal & electrical conductivity is same for all the metals at the same temperature ; and at around room temperature, this ratio is proportional to(where, T = absolute temperature, °K)

A. T
B. 1/T
C. T²
D. 1/T²

Question 921

Cadmium in zinc leach liquor is removed by cementation using

A. Zinc
B. Iron
C. Nickel
D. Copper

Question 922

A good abrasive

A. Should be friable
B. Should have low refractoriness
C. Is made up of large size of crystals
D. Should be soft

Question 923

The hardness of the lathe bed material is measured by the

A. Shore sceleroscope
B. Brinnel hardness tester
C. Vicker's hardness tester
D. Rockwell hardness tester

Question 924

Addition of silicon to cast iron

A. Promotes graphite module formation
B. Improves its ductility
C. Does not promote graphite flakes formation
D. Increases the fluidity of molten metal

Question 925

Biological shield in a nuclear reactor is generally provided to protect against the

A. α-rays
B. β-rays
C. Gamma rays & neutrons
D. Electrons

Question 926

Tip of the match stick contains a mixture of

A. K + S
B. K + S + K₂Cr₂O₇
C. S + K₂Cr₂O₇ + White P
D. None of these

Question 927

The term 'Value' in value engineering technique refers to the __________ cost of the product.

A. Function (utility)
B. Selling
C. Production
D. Total

Question 928

Phosphorous is added to copper melt to

A. Remove hydrogen
B. Deoxidise the metal
C. Improve fluidity
D. Reduce shrinkage

Question 929

Hoope's cell is predominantly used for the electrolytic refining of

A. Zinc
B. Copper
C. Aluminium
D. Tin

Question 930

When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the

A. Partial pressure of water vapour is less than the total pressure
B. Humidity is < 100% & dew point temperature of air has not reached
C. Dew point temperature of air has not reached & air is not saturated fully
D. Air is fully saturated

Question 931

Yield strength of a material is determined by the __________ test.

A. Creep
B. Tension
C. Compression
D. Endurance

Question 932

Which of the following absorbs maximum heat in a high pressure boiler ?

A. Economiser
B. Steam superheater
C. Air preheater
D. Furnace water wall

Question 933

Which of the following metals is the most prone to work hardening?

A. Brass
B. Aluminium
C. Copper
D. Lead

Question 934

Increasing sulphur content in pig iron tends to make it

A. Soft
B. Hard
C. Tough
D. Ductile & malleable

Question 935

Machine tool bodies are usually made of

A. Cast iron
B. Mild steel
C. Wrought iron
D. Copper alloys

Question 936

The thermal efficiency of a heat engine giving an output of 4 KW with an input of 10000 Joules/sec is __________ percent.

A. 40
B. 80
C. 10
D. 25

Question 937

A pipeline buried in soil is commonly protected from corrosion by

A. Anodic protection
B. Cathodic protection
C. Using inhibitors
D. Using a special alloy resistant to corrosion

Question 938

Maximum consumption of limestone is in the __________ industry.

A. Iron and steel
B. Cement
C. Glass
D. Fertiliser

Question 939

Which of the following materials has the poorest electrical conductivity?

A. Carbon
B. Aluminium
C. Silver
D. Stainless steel

Question 940

Presence of small quantity of sulphur in low carbon steel improves its

A. Formability
B. Machinability
C. Weldability
D. Hardenarality

Question 941

Galvanic corrosion can not be prevented by

A. Cathodic protection
B. Anodic protection
C. Usage of largest possible anodic area
D. Any one of these

Question 942

A fine grained grinding wheel should not be used for grinding __________ materials.

A. Hard
B. Brittle
C. Soft & ductile
D. None of these

Question 943

Presence of nickel & chromium in steel does not raise its

A. Elastic limit
B. Machining properties
C. Ductility
D. Resilience

Question 944

Boiling point of water gets lowered at high altitudes (e.g., hills), because

A. Temperature is low
B. Atmospheric pressure is low
C. Atmospheric pressure is high
D. None of these

Question 945

Temperature attained in soldering of metals is about __________ °C.

A. 150-300
B. 400-500
C. 650-800
D. 1000-1100

Question 946

Ageing of steel refers to the

A. Degradation of steel by corrosion
B. Failure of steel structure by overstress-ing
C. Return of sharp yield point in temper rolled low carbon sheet after a period of time
D. Decarburisation of steel by overheating

Question 947

Tesla metre per ampere (T. m/A) is the unit for the measurement of

A. Magnetic succeptibility
B. Magnetic moment
C. Permeability of free space
D. Flux density

Question 948

A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².

A. 6
B. 18
C. 38
D. 52

Question 949

Fatigue strength of a metal is improved by

A. Overstressing
B. Scratching the surface
C. Raising the temperature
D. Understressing

Question 950

Pick out the wrong statement.

A. In a thin spherical shell under internal pressure, hoop stress is equal to the half of axial stress
B. Thermoplastic material does not follow Hooke's law of elasticity
C. Components under longitudinal compression is called 'struts' and the load under which strut fails is called crippling or buckling load
D. At low temperatures (sub-zero) in pressure vessels, the ductility of metal diminishes and brittle fracture occurs while at high temperature in pressure vessels, embrittlement of material may take plac

Question 951

In __________ process, there is an increase in entropy with no degradation of energy.

A. Isothermal expansion
B. Isochoric heat addition
C. Polytropic expansion
D. Isobaric heat addition

Question 952

Superheating of steam is done at constant

A. Enthalpy
B. Entropy
C. Pressure
D. Volume

Question 953

Identify the correct statement.

A. Sphlerite is zinc oxide
B. The first law of the thermodynamics is stated as δE = δQ - δW
C. Lead can be produced in a blast furnace
D. T. ferrooxidans is a fungus that can be used for leaching chalcopyrite

Question 954

Speisses is a mixture of the following:

A. Arsenides of heavy metals.
B. Antimonides of heavy metals.
C. Arsenides & antimonides of heavy metals.
D. Iron, cobalt and nickel.

Question 955

Constituents of stellite are

A. Zinc, copper & nickel
B. Cobalt, chromium & tungsten
C. Zinc, aluminium & nickel
D. Nickel, cobalt & vanadium

Question 956

Coarse grained steels have

A. Low toughness
B. No tendency to distort
C. High density
D. Very high toughness

Question 957

Which of the following fastening devices has a head at one end and a nut fitted to the other?

A. Bolt
B. Stud
C. Top bolt
D. None of these

Question 958

An orthotropic material is a special class of anisotropic material, which is described by their properties in three perpendicular directions. An example of orthotropic material is

A. Stainless steel
B. Cast iron
C. Wood
D. Teflon

Question 959

__________ stress can not be sustained by a fluid in equilibrium.

A. Shear
B. Tensile
C. Compressive
D. None of these

Question 960

Percentage of argon (by volume) in dry atmospheric air is about

A. 0.09
B. 0.3
C. 0.57
D. 0.94

Question 961

For a spontaneous natural process at constant temperature and pressure, the free energy of the system always

A. Increases
B. Decreases
C. Remains constant
D. Increases to a maximum before decreasing

Question 962

In Newton's law of viscosity, which states that the shear stress is proportional to the __________ Co-efficient of viscosity is called dynamic or absolute viscosity(where, V = velocity, Vg = velocity gradient ).

A. V²
B. 1/V²
C. 1/Vg
D. Vg

Question 963

Out of the following, the materials having maximum magnetic permeability is

A. Silicon steel (Si = 4%)
B. Cast iron
C. Wrought iron
D. Mild steel

Question 964

The dew point of moist air becomes __________ with decrease in its relative humidity.

A. Less than the wet bulb temperature
B. More than the wet bulb temperature
C. More than the dry bulb temperature
D. Equal to wet bulb temperature

Question 965

__________ forces do not act in case of fluids.

A. Vibratory
B. Centrifugal
C. Elastic
D. Tensile

Question 966

Carbon is present in the form of __________ in grey cast iron.

A. Spheroids
B. Nodular aggregates of graphite
C. Flakes
D. Cementite

Question 967

The most important function of a washer is to provide bearing area and washers are normally specified by their hole diameters. The diameter of washer as compared to the nut is

A. More
B. Less
C. Same
D. More but less than the diameter of bolt

Question 968

Hot extrusion of aluminium is done in the temperature range of __________ °C.

A. 550-600
B. 450-500
C. 350-400
D. 250-300

Question 969

"Internal energy of a gas obeying Vanderwall's equation of state, (p + a/v²)(V - b) = RT , depends upon its"

A. Pressure & temperature
B. Pressure & specific volume
C. Temperature & specific volume
D. Temperature only

Question 970

Addition of __________ to steel can not impart it high strength at elevated temperature.

A. Nickel
B. Magnesium
C. Silicon
D. Manganese

Question 971

Which of the following is not found in iron-carbon equilibrium diagram?

A. Curie point
B. Peritectic point
C. Eutectic point
D. Eutectoid point

Question 972

Which of the following pair is correctly matched?

A. Heat transfer: Thermal diffusivity
B. Mass transfer: Diffusion co-efficient
C. Momentum transfer: Kinematic viscosity
D. All of the above

Question 973

Steam condenser tubes are made of ad-mirability brass, in which percentage of zinc & copper are __________ respectively.

A. 70 & 30
B. 30 & 70
C. 50 & 50
D. 90 & 10

Question 974

Cold cracking in the heat affected zone of a high strength steel weld can take place because of the

A. Retained austenite
B. Martensite formation
C. Relatively high sulphur content in the base metal
D. Sufficient hydrogen present in the welding arc

Question 975

The minimum carbon content in steel should be __________ percent for it to respond to a hardening treatment.

A. 0.2
B. 0.4
C. 0.6
D. 0.8

Question 976

Which of the following polymers is obtained by copolymerisation of three monomers?

A. SAN
B. ABS
C. SBR
D. PTFE

Question 977

Which of the following alloying elements reduces the formation of iron sulphide in steel?

A. Cobalt
B. Nickel
C. Manganese
D. Vanadium

Question 978

Sub zero treatment of steel is done to

A. Suppress martensite transformation
B. Enhance its working performance in sub zero atmosphere
C. Reduce the retained austenite in hardened steel
D. Induce temper brittleness after its hardening

Question 979

There are one octahedral void and __________ tetrahedral void in the closest packing of atoms.

A. One
B. Two
C. Three
D. None of these

Question 980

Creep consideration is the most important in case of the

A. Blades of gas turbines
B. Steam engine flywheel
C. Cast iron pipes
D. Cycle chains

Question 981

The product (s) of roasting of a sulphide ore is (are)

A. Oxide only
B. Sulphate only
C. Oxide and sulphate
D. Dependent on temperature and partial pressure of oxygen & sulphur dioxide

Question 982

A reduction in thermal resistance during heat transfer does not occur in the

A. Convection heat transfer by stirring the fluid and cleaning the heating surface
B. Conduction heat transfer by reduction in the material thickness and increase in the thermal conductivity
C. Radiation heat transfer by increasing the temperature and reducing the emis-sivity
D. None of these

Question 983

Nitrogen is not an essential component of

A. Protein
B. Urea
C. Oils & fats
D. Any of these

Question 984

Air-petrol ratio in an automotive petrol engine is around

A. 14 : 1
B. 22 : 1
C. 25 : 1
D. 4 : 1

Question 985

If the demand for an item is trebled and the order cost is reduced to one third, then the economic order quantity

A. is trebled.
B. remains unchanged.
C. decreases by a factor of 3.
D. decreases by a factor of 1/3.

Question 986

The capacity of a material to absorb energy depends upon both its strength & stiffness. The term 'stiffness' of a material is the opposite of its

A. Flexibility
B. Plasticity
C. Hardness
D. Hardenability

Question 987

Ammonia gas can be dried by

A. PCl₅
B. Quick lime
C. CaCl₂
D. Concentrated H₂SO₄

Question 988

A suitable lubricant used for watches is

A. Metallic soap solution
B. Grease
C. Palm oil
D. Hazel-nut oil

Question 989

Steel is welded using the __________ flame.

A. Carburising
B. Neutral
C. Oxidising
D. All of the above

Question 990

For a first order chemical reaction, the concentration of the reactant decreases __________ with time.

A. Linearly
B. Exponentially
C. Logarithmically
D. Inversely

Question 991

FeO (s) + CO (g) = Fe (s) + CO₂ (g), k = 0. 435 at 1173E; At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173 K?

A. 1
B. 1.3
C. 2.3
D. 3.3

Question 992

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

A. 10-3
B. 103
C. 10-15
D. L015

Question 993

The function of a nozzle provided in steam turbine is to

A. Throttle down (i.e., reduce) the pressure of steam
B. Convert internal energy into kinetic energy
C. Increase the velocity of steam
D. All of the above

Question 994

During solid state sintering of powders, the following mechanism can be active.

A. Evaporation and condensation
B. Solid state diffusion processes
C. Liquid formation in grain boundaries
D. Creation of more dislocations

Question 995

The velocity at which individual particles from a fluidised bed are carried away by the fluid passing through it, is defined as the

A. Minimum fluidisation velocity
B. Terminal velocity
C. Elutriation velocity
D. Superficial velocity

Question 996

Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.

A. 20
B. 200
C. 500
D. 1000

Question 997

__________ strain gauge is the most sensitive sensing element for strain measurement.

A. Photoelastic
B. Semiconductor
C. Wire resistance
D. None of these

Question 998

The tensile strength of plastics ranges from __________ kg/mm².

A. 10 to 50
B. 50 to 100
C. 0.01 to 0.1
D. 0.1 to 10

Question 999

Which of the following are made out of the carbon steel having carbon content of 0.9 to 1% ?

A. Small punches, broaches reamers and springs
B. Cutlery, screws, rivets and files
C. Mandrels, twist drills, small lathe tools and razors
D. Forgings like can shaft, structural steel plate, threading dies and drawing dies

Question 1000

Basicity [%Cao + %MgO/% SiO₂) of the slag in Indian blast furnace is in the range of

A. 0.7-1.0
B. 1.1-1.4
C. 1.5 - 1.8
D. 2.0 - 2.5

Question 1001

Scab is a defect developed during __________ of metals.

A. Forging
B. Sand casting
C. Machining
D. Welding

Question 1002

Nitriding of a steel part does not increase its

A. Grain size
B. Fatigue limit
C. Surface hardness
D. Wear resistance

Question 1003

pH value of rain water in India ranges from

A. 5.5 to 7.5
B. 8 to 9.5
C. 3.5 to 5
D. 9.5 to 10.5

Question 1004

When a copper ball is heated, the largest percentage increase will be in its

A. Radius
B. Area
C. Mass
D. Volume

Question 1005

Tin based white metals are used, where bearings are subjected to

A. High pressure & load
B. Low pressure & load
C. High temperature
D. Large surface wear

Question 1006

Annealing ofwhite cast iron produces __________ iron.

A. grey
B. nodular
C. malleable
D. spheroidal

Question 1007

With increase in annealing temperature, the following defect density decreases.

A. Vacancy
B. Dislocation
C. Grain boundary
D. All of the above

Question 1008

__________ number is sometimes used in place of Grashoff number in free convection heat transfer.

A. Stanton
B. Brinkman
C. Rayleigh
D. Nusselt

Question 1009

Ammonia leakage in the refrigeration system is detected by

A. Sulphur stick, which on detection gives white smoke
B. Using chemical reagents
C. Its smell
D. Soap solution

Question 1010

The phenomenon occurring during explosion of a hydrogen bomb is

A. Nuclear fission
B. Nuclear fusion
C. A combination of both nuclear fission & fusion
D. None of these

Question 1011

The gases used in the treatment of asthma is a mixture of __________ and oxygen.

A. Helium
B. Argon
C. Neon
D. None of these

Question 1012

Super conduction in metals is observed at a temperature of __________ °K.

A. <100
B. >100
C. About 273
D. About 373

Question 1013

Wave length of X-rays is about 1 angstron, however it can not pass through a sheet of

A. Paper
B. Cloth
C. Lead
D. Aluminium

Question 1014

Which of the following is the largest quantum of pressure?

A. 1 kg/cm²
B. 1 bar
C. 1 atmosphere
D. 1 kilo Pascal

Question 1015

The best criterion for analysing an economic investment is the

A. Rate of return criterion
B. Present value method
C. Salvage value
D. Future value method

Question 1016

Steels with high carbon equivalent have poor weldability, because in these steels during welding

A. Carbon and other alloying elements get oxidised from the weld pool
B. Excessive ferrite forms in the heat affected zone leading to poor toughness of the weld
C. Martensite forms in the heat affected zone leading to poor toughness/ductility of the weld
D. Segregation of carbon and other element occurs in the weld pool leading to poor properties of the weld

Question 1017

Corrosion rate can not be lowered by reducing the __________ of the corroding medium.

A. Concentration
B. Velocity
C. Temperature
D. None of these

Question 1018

Temper brittleness of a material can be fairly detected by the __________ test.

A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness

Question 1019

A spring material should have low

A. Elastic limit
B. Deflection value
C. Fatigue resistance
D. None of these

Question 1020

In chemical dehumidification process

A. Wet bulb temperature increases
B. Dry bulb temperature remains constant
C. Dew point temperature increases
D. Dry bulb temperature increases

Question 1021

Stretcher strains found in a low carbon sheet are associated with the

A. Texture
B. Dislocation density
C. Yield point phenomenon
D. Thickness of the sheet

Question 1022

For efficient performance of a blast furnace, the extent of reduction of Wustite (FeO) should be

A. 100% indirect reduction
B. 100% direct reduction
C. 50-60% indirect reduction
D. 30-40% indirect reduction

Question 1023

A highly elastic material is deformed least on loading and retains its original form on removal of the load. Which of the following is the most elastic material?

A. Steel
B. Glass
C. Rubber
D. Brass

Question 1024

__________ method of depreciation calculation ensures that the interest is charged on the cost of machine asset every year on the book value, but the rate of depreciation remains constant every year.

A. Annuity charging
B. Atraight line
C. Ainking fund
D. None of these

Question 1025

M10 index of coke indicates its

A. Compressive strength
B. Hardness
C. Abrasion resistance
D. Impact strength

Question 1026

Dislocation cross-slip is difficult in those materials, which have

A. Large number of slip systems
B. High work hardening rate
C. Coarse grain size
D. Low stacking fault energy

Question 1027

Oxygen content below __________ percent in air contaminated with nitrogen does not support combustion and is unsafe for humane exposure.

A. 18
B. 16
C. 14
D. 12

Question 1028

The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge)

A. X1.5
B. X0.8
C. X-1.5
D. X-0.8

Question 1029

Identify the false statement

A. Martensitic steels are less susceptible to pitting corrosion than austenitic steels
B. Pitting corrosion is usually very localised
C. Hydrogen embrittlement is facilitated by tensile stress
D. Stress corrosion cracking is facilitated by tensile stress

Question 1030

The difference in the properties of a substance in three states of matter depends upon the

A. Binding energy of atoms
B. Difference in molecular shape
C. Difference in intermolecular forces
D. None of these

Question 1031

Minimum diameter of the tube used for making water manometer should be __________ mm to avoid a correction for the effect of capillarity.

A. 1
B. 2.5
C. 4
D. 6

Question 1032

Which of the following has the highest value of refractive index?

A. Brine (sea water)
B. Diamond
C. Distilled water
D. Glass

Question 1033

An approximately __________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section.

A. Adiabatic
B. Isothermal
C. Isentropic
D. Isochoric

Question 1034

Multistage compression is necessary for high efficiency,

A. If the ratio of the delivery pressure to the intake pressure exceeds 5:1
B. When large amount of gas is to be compressed
C. When the delivered gas is desired at very high velocity
D. None of these

Question 1035

Solidification time of a molten metal in a casting is proportional to (where, V = volume of metal & A = its surface area ; in the casting)

A. V/A
B. V/A²
C. V²/A
D. V²/A²

Question 1036

__________ number determines whether the fluid flow in an open channel is supercritical, critical or sub-critical.

A. Mach
B. Reynolds
C. Froude
D. Weber

Question 1037

Tin based white metals are used, where bearings are subjected to

A. high pressure & load.
B. low pressure & load.
C. high temperature.
D. large surface wear.

Question 1038

Knocking tendency in a petrol engine decreases with increasing

A. Supercharging
B. Compression ratio
C. Wall temperature
D. Engine speed

Question 1039

Which of the following phenomenon will exhibit the minimum heat transfer?

A. Boiling
B. Forced convection in air
C. Free convection in air
D. Conduction in air

Question 1040

The velocity of sound in air is independent of changes in its

A. Humidity
B. Pressure
C. Temperature
D. None of these

Question 1041

Liquid nitrogen containers can be made from

A. Ferritic stainless steel
B. HSLA steel
C. Titanium
D. Austenitic stainless steel

Question 1042

Colloids can be purified by

A. Dialysis
B. Reverse osmosis
C. Coagulation
D. Peptization

Question 1043

__________ is the process of coating the surface of steel with aluminium oxide, thereby imparting it increased resistance to corrosion & oxidation upto a temperature of 700°C.

A. Vaneering
B. Galvanising
C. Electroplating
D. Calorising

Question 1044

Enzymes belong to the category of

A. Proteins
B. Carbohydrates
C. Vitamins
D. Fats

Question 1045

Multistage compression of air as compared to single stage compression offers the advantage of

A. Power saving per unit weight of air delivered
B. Moisture elimination in the inter-stage cooler
C. Increased volumetric efficiency
D. All of the above

Question 1046

Which of the following materials has the least scrap value?

A. Aluminium
B. Stainless steel
C. Brass
D. Copper

Question 1047

The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.

A. Red
B. Extended
C. Super
D. Extreme

Question 1048

Tempering of a material does not improve its

A. Machinability
B. Toughness
C. Internal stress level
D. Softness

Question 1049

Two solutions A₁ & A₂ have pH value of 2 & 6 respectively. It implies that the solution

A. A₁ is more alkaline than solution A₂
B. A₁ is highly acidic
C. A₂ is very slightly acidic
D. Both B & C

Question 1050

For the same heat input & compression ratio, efficiency of Otto cycle is higher than that of diesel cycle, because in Otto cycle.

A. Heat rejection is lower
B. Expansion & compression are isentropic
C. Maximum temperature is higher
D. Combustion is at constant volume

Question 1051

High __________ of cast iron makes it suitable for use in machine beds.

A. Compressive strength
B. Endurance strength
C. Damping capacity
D. Tensile strength

Question 1052

Out of the following, the alloy which has equal percentage of constituents, is

A. White metal
B. Gun metal
C. Duralumin
D. Constanton

Question 1053

Stress and strain are related by __________ elastic constants for a linearly elastic, homogeneous & isotropic material.

A. One
B. Two
C. Three
D. Four

Question 1054

Dowtherm is a

A. High temperature heating medium (a petroleum product)
B. Product of coal tar distillation
C. Very heat sensitive material
D. None of these

Question 1055

Iron content in Indian iron ore is about __________ percent.

A. 80-85
B. 60-65
C. 40-45
D. 20-25

Question 1056

As the fluid flow rate increases, the float of the rotameter

A. Rises in the tube
B. Rotates at higher speed
C. Rotates at lower speed
D. Drops down in the tube

Question 1057

__________ can not increase the fatigue strength of a material.

A. Grain refining
B. Grain coarsening
C. Surface hardening
D. Shot peening

Question 1058

The type of pump used for lifting large quantity of sewage is a __________ pump.

A. Gear
B. Centrifugal
C. Reciprocating
D. Plunger

Question 1059

Which of the following is capable of acting both as an acid flux as well as a basic flux in the metal extraction from its ore?

A. Silica
B. Lime
C. Alumina
D. Fluorite

Question 1060

Which is the most lethal weapon ?

A. Atom (fusion) bomb
B. Hydrogen bomb
C. Cobalt bomb
D. Neutron bomb

Question 1061

In a good rimming steel

A. Carbon and silicon should be low
B. Silicon should be low but carbon should be high
C. Both silicon & carbon should be high
D. Silicon should be high but carbon should be low

Question 1062

Thermal efficiency of an internal combustion engine is around __________ percent.

A. 8
B. 35
C. 65
D. 80

Question 1063

Dephosphorisation of molten pig iron is favoured by

A. Oxidising and basic slag
B. Reducing and basic slag
C. High activity co-efficient of phosphorous in metal
D. Oxidising and neutral slag

Question 1064

Heat transfer to the water wall in a high pressure water wall type boiler furnace is mainly by

A. Conduction
B. Convection
C. Both A & B
D. Radiation

Question 1065

Globular form of cementite is formed during the __________ process.

A. Spherodising
B. Hardening
C. Annealing
D. Normalising

Question 1066

Which of the, following is not associated with the functioning of a petrol engine ?

A. Compression ignition system
B. Spark plug
C. Carburettor
D. Otto cycle

Question 1067

Number of electrons in the outermost shell of a semi-conductor material is

A. 2
B. 4
C. 6
D. 8

Question 1068

Steel produced from phosphatic iron is __________ in nature.

A. Malleable
B. Ductile
C. Brittle
D. Tough

Question 1069

The pH value is the measure of hydrogen ion concentration in a solution. The term pH stands for the __________ in the solution.

A. Power of hydrogen ion concentration
B. Percentage of hydrogen ions
C. Presence of hydrogen ions
D. None of these

Question 1070

Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.

A. 10-Mar
B. 103
C. Oct-15
D. l015

Question 1071

Which of the following has rotten eggy smell?

A. Hydrogen sulphide
B. Styrene
C. Phenol
D. Dimethyl amine

Question 1072

Which of the following is not a principal alloying element for the structural steel?

A. Molybednum
B. Nickel
C. Manganese
D. Chromium

Question 1073

The cooling rate required to freeze 1 ton of water at 0°C into ice at 0°C in 24 hours is __________ BTU/hr.

A. 100
B. 200
C. 1000
D. 2000

Question 1074

Gas carrying pipelines are best joined by

A. Nuts & bolts
B. Rivetting
C. Welding
D. None of these

Question 1075

Hooke's law

A. Applies to elastic deformation
B. Applies beyond limit of proportionality in stress-strain curve
C. States that stress is inversely proportional to strain upto elastic limit
D. Noneofthese

Question 1076

The predominant mode of heat transfer which takes place from boiler furnace to water walls of a boiler is

A. Conduction
B. Convection
C. Both A & B
D. Radiation

Question 1077

Specific gravity of a metal, which weighs 5 kg in air and 4 kg when submerged in water, will be

A. 5
B. 1.25
C. 2.5
D. 3.75

Question 1078

Batch process is preferred over continuous process, when the

A. Product yields and quality can not be achieved in continuous process, because of long residence time
B. Sales demand of product is not steady
C. Same equipment can not be used for several processes of the same nature
D. All of the above

Question 1079

For the Stoke's law to be valid in the case of a falling sphere in a fluid, the

A. Reynolds number (based on sphere diameter) should be < 1
B. Flow around the sphere should be in turbulent region
C. Sphere must be metallic
D. Fluid density should be constant

Question 1080

Eutectoid composition of carbon steel at room temperature is

A. Cementite
B. Pearlite
C. Martensite
D. Ferrite

Question 1081

Pick out the wrong statement.

A. Erosion corrosion which is identified by surface grooves, occurs due to the combined action of corrosive environment and mechanical abrasion
B. Stress corrosion occurs due to the combined action of corrosive environment and the compressive stress
C. Stainless steel is prone to stress corrosion in solution containing chloride ion
D. In case of stress corrosion, the direction of crack propagation is perpendicular to the applied tensile stress

Question 1082

Pick out the wrong statement. Termination of polymerisation reaction occurs, if the

A. Catalyst supply is stopped
B. Monomer supply is exhausted
C. Impurities present in monomers interfere with the chemical reaction
D. Two ends of a chain of molecules join

Question 1083

An alloy of Fe - 0.4 % C is

A. cast iron.
B. hypo-eutectoid steel.
C. hyper-eutectoid steel.
D. eutectoid steel

Question 1084

Which of the following metals occurs in nature in their free metallic state?

A. Au & Ag
B. Pb & Zn
C. Cu & Ni
D. None of these

Question 1085

The factor of safety for brittle materials (having elongation < 5%) is based on the __________ stress.

A. Yield
B. Proof
C. Ultimate
D. None of these

Question 1086

Increasing the temperature of a material makes it

A. Harder
B. Softer
C. Tougher
D. Stronger

Question 1087

Which of the following parameters is actually measured during tensile testing of a specimen using Universal testing machine?

A. Load & elongation
B. Engineering stress & strain
C. True stress & strain
D. Poisson's ratio & Young's modulus

Question 1088

Evaporative cooling process employs a combination of cooling and humidification in which the

A. Sensible heat is added
B. Sensible heat is removed and the latent heat is added
C. Latent heat is removed
D. Sensible heat is added and latent heat is removed

Question 1089

In TIG welding, thoriated tungsten electrodes are used, because it

A. Has higher current carraying capacity
B. Has better electron emissivity
C. Is stronger than ordinary tungsten
D. Is easy to prepare

Question 1090

The most commonly used combustion system manufactured in India for the thermal power plant boilers is the __________ combustion system.

A. Pulverised fuel
B. Travelling grate stoker firing
C. Circulating fluidised bed
D. Fluidised bed

Question 1091

In hot working, dynamic recovery occurs in

A. Metals of low stacking fault energy
B. Metals of high stacking fault energy e.g. α-iron
C. Single crystal of Ni-based superalloys
D. None of these

Question 1092

Stellite is a __________ material.

A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non ferrous cast alloy cutting tool

Question 1093

An engineer's hammer is made of high __________ steel.

A. Carbon
B. Speed
C. Silicon
D. Chromium

Question 1094

Maximum change in the hardness of mar tensite occurs in the carbon content range of __________ percent in steel.

A. 0.01 to 0.10
B. 0.2 to 0.4
C. 0.5 to 0.7
D. 0.8 to 1.0

Question 1095

Circular cross section machine parts which are symmetrical about the axis of rotation are made by hot

A. Piercing
B. Spinning
C. Drawing
D. Extrusion

Question 1096

Routing in production, planning & control is concerned with the

A. Sequence of operation to be performed
B. Progress of work performed
C. Authorisation of work to be performed
D. Balancing of load on machines

Question 1097

An oxidation process is accompanied with decrease in the

A. Number of electrons
B. Oxidation number
C. Number of ions
D. All of the above

Question 1098

Wrought iron does not have

A. Uniform strength in all directions
B. Ability to hold protective coating
C. High ductility & corrosion resistance
D. Easily weldable characteristics

Question 1099

The heat released by cooling one mole of copper from 400 K to room temperature (300 K) is (assume : Cp of copper is 23 J K⁻¹mole⁻¹)

A. 2300 J
B. 4600 J
C. 230 J
D. 2.3 x 106 J

Question 1100

Particle nature of cathode rays is proved due to the fact that they

A. Travel in a straight line
B. Get deflected by magnetic electric field
C. Produce fluorescence
D. Heat the exposed material

Question 1101

Prandtl mixing length in turbulent flow signifies the

A. Average distance perpendicular to the mean flow covered by the mixing particles
B. Wavelength corresponding to the lowest frequency present in the flow field
C. Ratio of mean free path to characteristic length of the flow field
D. Magnitude of turbulent kinetic energy

Question 1102

Plasma is

A. A high temperature neutral gas
B. Nothing but ionised gas
C. A source of steady and highest controllable pressure
D. Formed at very low temperature

Question 1103

The phenomenon of weld decay is found in case of

A. Gun metal
B. Brass
C. Stainless steel
D. Cast iron

Question 1104

Reduction reaction involves the

A. Loss of electrons
B. Increase in oxidation number
C. Gain of electrons
D. Addition of oxygen

Question 1105

In a fuel cell, chemical energy is converted into

A. Electrical energy directly
B. Mechanical energy
C. Electrical energy and stored therein
D. None of these

Question 1106

Which of the following performance characteristics of a S.I engine is not affected by the front end volatility of the petrol used?

A. Vapour locking
B. Hot starting
C. Spark plug fouling
D. All of the above

Question 1107

Fibre glass is a composite material of

A. Glass fibre in a polymer matrix
B. Glass fibre in a metallic matrix
C. Polymer fibre in a glassy matrix
D. Both B & C

Question 1108

Metals in general have a low value of thermal

A. Conductivity
B. Diffusivity
C. Inertia
D. All of the above

Question 1109

What is the percentage of chromium in 18-4-1 high speed steel?

A. 1
B. 4
C. 18
D. 23

Question 1110

Inspection of surface and sub-surface cracks in non-magnetic alloys is done by __________ testing method.

A. X-ray
B. Magnetic particle
C. Dye penetrant
D. Ultrasonic

Question 1111

Consumable electrodes are used in the __________ welding.

A. Gas
B. Arc
C. Thermit
D. Resistance

Question 1112

The underground well of a biogas plant is called the

A. Septic tank
B. Oxidation well
C. Digestor
D. Lagoon

Question 1113

In the acid Bessemer process, the hot metal should have the following com-positon.

A. S < 0.05% and P < 0.05%
B. S < 0.05% and P < 1.5%
C. S < 0.05% and P > 1.5%
D. S > 1.5% and P < 0.05%

Question 1114

What is the value of included angle of a triangular notch for maximum discharge ?

A. 30°
B. 60°
C. 90°
D. 120°

Question 1115

The amount of different substances produced, when the same quantity of electricity is passed through different solutions are proportional to their

A. Equivalent weight
B. (equivalent weight)²
C. Molecular weight
D. (molecular weight)²

Question 1116

In spite of large heat transfer co-efficients in boiling liquids, fins are used advantageously, where the entire surface is exposed to __________ boiling.

A. Film
B. Nucleate
C. Transition
D. All of the above

Question 1117

Which of the following parameters is not responsible for the heat loss from a hot steam carrying bare pipe surface located in a room without fans ?

A. Emissivity of pipe surface
B. Diameter & length of the pipe
C. Temperature of hot pipe surface & that of air in the room
D. None of these

Question 1118

Leakage in a cooking gas cylinder is detected by

A. Radio-isotopes
B. Pouring soap solution on the surface and locating the gas bubbles
C. Halide torch
D. Pungent smell of mercaptans present in the gas

Question 1119

Propulsion of rocket follows from the

A. Newton's second law of motion
B. Newton's third law of motion
C. Law of projectiles
D. Archimedes principle

Question 1120

The two elements required to form substitutional solid solution should not have

A. Same crystalline structure
B. Same valancy
C. Widely differing electronegativity
D. Same atomic sizes

Question 1121

Diameter of the rivet to be provided on a 20 mm. thick boiler plate will be __________ mm.

A. 10
B. 20
C. 30
D. 40

Question 1122

Buoyancy force depends on the __________ the liquid.

A. Depth of immersion in
B. Displaced mass of
C. Surface tension of
D. Viscosity of

Question 1123

About __________ ton of coke is required in a cupola to produce one ton of casting.

A. 0.03
B. 0.3
C. 0.8
D. 1.5

Question 1124

The refrigerant freon-12 is chemically

A. CCl₂F₂
B. CCl₃F
C. CClF₃
D. CCl₄F

Question 1125

Austenite is not

A. Ductile
B. Malleable
C. Magnetic
D. Soft

Question 1126

Which of the following is not an explosive?

A. TNT
B. CMC
C. RDX
D. Lead azide

Question 1127

During decarburising of a plain carbon steel, the thickness of ferrite layer growth is proportional to

A. Time
B. Square root of time
C. Square of time
D. Cube of time

Question 1128

Which of the following has the least oili-ness ?

A. Mineral oils
B. Vegetable oils
C. Greases
D. Animal oils

Question 1129

According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is

A. 180°
B. 212°
C. 32°
D. 273°

Question 1130

Water hammer in pipelines results, when the flowing fluid

A. Has very high velocity
B. Has very high pressure
C. Is brought to rest by gradually closing a valve
D. Is suddenly brought to rest by closing a valve

Question 1131

The stress at which a metal fails by fatigue lies

A. Near the fracture point of the stress-strain curve
B. In the plastic range
C. In the elastic range
D. None of these

Question 1132

Uniform ramming of sand in green sand moulding process leads to

A. Reduced chance of gas porosity
B. Greater dimensional stability of the casting
C. Uniform flow of molten metal into the mould cavity
D. Less sand expansion type of casting defect

Question 1133

Classification of metal forming processes into hot and cold working is based on the following parameters.

A. Stacking fault energy
B. Recrystallisation temperature
C. Solidus temperature
D. Transformation temperature

Question 1134

The stress at which extension of the material takes place more rapidly as compared to the increase in load is termed as the __________ point of the material.

A. Elastic
B. Ultimate
C. Yielding
D. Breaking

Question 1135

When water is sprayed on air, passing through an insulated chamber maintained at a temperature higher than the dew point of entering air but lower than its dry bulb temperature, then the air is

A. Cooled and dehumified
B. Heated and humidified
C. Cooled and humidified
D. Heated and dehumidified

Question 1136

Filler material used in welding having the lowest melting point out of the following is

A. Aluminium
B. Soft solder
C. Silver solder
D. Brazing spelter

Question 1137

Starting friction is low in case of the __________ lubrication.

A. Boundary
B. Hydrodynamic
C. Hydrostatic
D. Mixed/semi-fluid

Question 1138

Measurement of the area of the indented surface is not involved in the __________ hardhes testing method.

A. Vicker's
B. Rockwell
C. Knoop
D. Brinell

Question 1139

Slight displacement of a floating body in liquid makes it to oscillate about its

A. Centre of pressure
B. Centre of gravity
C. Metacentre
D. Centre of pressure

Question 1140

Welded joint is superior to revetted joint in respect of ease of fabrication, weight and strength. Which of the following joints is the most suitable for pipes carrying fluids under high pressure and temperature?

A. Flanged joint
B. Expansion joint
C. Bell and spigot joint
D. None of these

Question 1141

A controller action in which there is a con-tinous relation between the values of controlled variable and the rate of change of conrolled output signal is called the __________ action.

A. Proportional
B. Integral
C. Derivative
D. None of these

Question 1142

What is the pH of distilled water?

A. 0
B. 1
C. 7
D. 14

Question 1143

Turning/machining of __________ usually does not require any cutting fluid.

A. Cast iron
B. Stainless steel
C. Mild steel
D. Copper

Question 1144

More than 1000 tons refrigeration capacity plants are usually of __________ type.

A. Vapour compression
B. Vapour absorption
C. Air refrigeration
D. None of these

Question 1145

Electrochemical corrosion occurs

A. Where the liquid electrolytes containing free ions are present
B. Only in alloys
C. Only in pure metals
D. Due to direct chemical action of metal with oxygen

Question 1146

In the blast furnace, incorporation of water vapour in the blast gives the following effect.

A. Increases the reducing potential of the gas.
B. Increases the flame temperature.
C. No significant change occurs.
D. Increases the hydrogen content in the metal.

Question 1147

Out of the following, the dimensionless quantity is

A. Specific weight
B. Viscosity
C. Mach number
D. Density

Question 1148

On oscilloscope screen for dynamic measurement, lissajous diagram is normally used to determine the __________ of the input signal.

A. Frequency
B. Amplitude
C. Damping
D. None of these

Question 1149

Between 230 and 370°C, blue brittleness is caused in mild steel because of the

A. Immobility of dislocation
B. Strain-ageing
C. Increase in Young's modulus
D. Strain hardening

Question 1150

The capital & running costs of similar machines having unequal service life can be compared by the __________ method.

A. Equivalant annual cost
B. Rate of return
C. Present net worth
D. Capitalised cost

Question 1151

Corona discharge is related to the operation of a/an

A. Induction motor
B. Electrostatic precipitator
C. Fast breeder reactor
D. Magneto hydrodynamic generator (MHD)

Question 1152

Copper is not present as an alloying constituent in

A. Silicon bronze
B. Constantan
C. Nichrome
D. Delta metal

Question 1153

If a heat transfer surface is pock-marked with a number of cavities, then as compared to a smooth surface the heat transfer by __________ will not increase.

A. Convection
B. Nucleate boiling
C. Radiation
D. Conduction

Question 1154

Maximum carbon content in cast iron is __________ percent.

A. 3.8
B. 4
C. 4.3
D. 4.6

Question 1155

Volute casing of a centrifugal pump does not facilitate

A. Uniform flow of fluid coming out of the impeller
B. Increase in the pump efficiency
C. Conversion of the part of the velocity head to the pressure head
D. Conversion of the part of the pressure head to velocity head

Question 1156

Stresses encountered in the metal forming processes are less than the __________ of the material.

A. Fracture strength
B. Yield strength
C. Elastic limit
D. Limit of proportionality

Question 1157

The capacity of a spring to store energy is called the spring form co-efficient. Stiffness of a spring is measured by the

A. Ability to absorb shock
B. Capacity to store energy
C. Ratio of the wire & coil diameters
D. Load to produce unit deflection

Question 1158

While the oxy-acetylene flame produces a temperature of 3200°C, the temperature produced by oxy-hydrogen flame is about __________ °C.

A. 1800
B. 2000
C. 2400
D. 3000

Question 1159

An atom bomb works on the principle of

A. Nuclear fission
B. Nuclear fusion
C. Both the nuclear fission & fusion
D. Ionisation

Question 1160

__________ is the trade name assigned to a non-ferrous cast alloy composed of cobalt, chromium & tungsten.

A. Stellite
B. High speed steel
C. Cermet
D. Alnico

Question 1161

An ingot is hot forged to a 60% reduction in cross-section area. The percentage reduction in the volume for the above process is

A. 0
B. 60
C. 30
D. 20

Question 1162

Midrex process of sponge iron production uses reformed natural gas as the reducing agent, which uses iron ore in the form of

A. Lumps
B. Pellets
C. Briquettes
D. Sinter

Question 1163

Which of the following contains the least percentage of carbon ?

A. Pig iron
B. Wrought iron
C. Cast iron
D. Malleable iron

Question 1164

In order to protect the aquatic creatures, the dissolved oxygen content in fresh water stream should never be less than __________ PPm.

A. 0.5
B. 1
C. 5
D. 20

Question 1165

While the thermosetting polymers are amorphous in nature, the thermoplastic polymers are either amorphous or crystalline. The crystalline polymers are characterised by the

A. Low impact strength
B. High flexibility
C. Better finish and surface appearance
D. High plastic deformation

Question 1166

Maxwell's thermodynamic relations applies to the

A. chemical systems in equilibrium.
B. mechanical systems in equilibrium.
C. irreversible thermodynamic processes.
D. reversible thermodynamic processes.

Question 1167

The total frictional resistance to fluid flow does not depend upon the

A. Roughness of the surface
B. Fluid pressure
C. Fluid density
D. Fluid velocity

Question 1168

A pycnometer is used for the measurement of

A. Flow rate of molten metal
B. Specific gravity of a liquid
C. Composition of alloys
D. Concentration of a solution

Question 1169

The most commonly used material for sewers for carrying sewage in the normal situation is

A. Asbestos cement
B. Stainiess steel
C. Stoneware
D. Cast iron

Question 1170

Which of the following is a synthetic abrasive ?

A. Corundum
B. Emery
C. Pumice
D. Silicon carbide

Question 1171

Materials having resistivity ranging from 1 to 100 ohm. cm is termed as

A. Conductor
B. Insulator
C. Semi-conductor
D. None of these

Question 1172

Ceramic tips for the cutting tool are prepared from __________ powder.

A. Carbon
B. Silicon carbide
C. Aluminium oxide
D. Tungsten

Question 1173

Absorptivity of a grey body varies with the

A. Wavelength of the incident ray
B. Temperature
C. Both A & B
D. Neither A nor B

Question 1174

Stainless steel is welded with difficulty because of

A. Its high melting temperature
B. Chances of cracking
C. Oxide film formation
D. Chromium carbide formation

Question 1175

In condensers used in thermal power plants, steam is normally used in shell side and cooling water on the tube side, because of the reason that

A. compared to the mass flow rate of cooling water, the rate of condensation of steam is invariably smaller.
B. maintaining vacuum on tube side is more difficult than that on the shell side.
C. water velocity can be increased conveniently to increase the overall heat transfer co-efficient because of its lower specific volume compared to steam.
D. condenser can act as a storage unit for condensed steam.

Question 1176

Annealing of cast iron

A. Softens it to facilitate machining
B. Decreases the free carbon
C. Increases the strength
D. None of these

Question 1177

Mechanism/phenomenon involved in the improvement of fatigue strength of a material by shot peening is the

A. Induction of residual compressive stress on the surface
B. Removal of stress concentration from the surface
C. Grain refinement
D. Surface polishing

Question 1178

Induced draft fans provided in large thermal power plant boilers have __________ blades.

A. Forward curved
B. Backward curved
C. Double curved
D. Radial or straight

Question 1179

The main constituent of bones is

A. CaF₂
B. Ca₃(PO₄)₂
C. CaCO₃
D. CaCl₂

Question 1180

Diamagnetic materials

A. Are magnetised by eddy currents only
B. Are non-magnetic and can not be magnetised
C. Are magnetised in direction opposite to the magnetic field
D. Can be magnetised in one direction only

Question 1181

Scaling occurs in boiler tubes due to the fact that, the solubility of Ca(OH)₂ __________ with increasing temperature.

A. Increases
B. Decreases
C. Shows inversion of solubility
D. None of these

Question 1182

__________ can not be forged.

A. High speed/carbon steel
B. Cast iron
C. Wrought iron
D. Mild steel

Question 1183

Which of the following is not a dielectric material?

A. Cotton, silk and paper
B. Asbestos, glass, porcelain and mica
C. Rubber and polymeric resins
D. All of the above

Question 1184

The usual energy consumption in electric arc furnace steel making is __________ KWh/ton of steel.

A. 60 - 100
B. 400 - 700
C. 1200 -1500
D. 2000 - 2300

Question 1185

Which of the following is the most effective inhibitor of grain growth, when added in small quantity in steel ?

A. Manganese
B. Vanadium
C. Cobalt
D. Copper

Question 1186

For preparation of porous bearings by powder metallurgy, preferred particle shape is

A. Spherical
B. Nodular
C. Irregular
D. No preferred shape

Question 1187

Boiler rating is normally done in terms of

A. Steam temperature & pressure
B. Steam output (tons/hr)
C. Heat transfer rate (kcal/hr)
D. Heat transfer area (m²)

Question 1188

Pick out the wrong statement.

A. Cold cracking of a weld is due to the presence of hydrogen gas in the weld
B. True stress is given by, σ = σE (1 + εE), where σE and εE are engineering stress and engineering strain respectively
C. Phosphorous can be easily recovered in the iron blast furnace
D. High residual stress at the surface is beneficial for fatigue properties of a material

Question 1189

The wet bulb temperature is lower in dry air than in wet air at the same temperature. A dry bulb thermometer registers a higher temperature than a wet bulb thermometer except at __________ percent relative humidity.

A. 0
B. 100
C. 50
D. None of these

Question 1190

Paint spray gun works on the principle of

A. Bernoulli's theorem
B. Boyle's law
C. Newton's law of viscosity
D. None of these

Question 1191

Which of the following is not a suitable solid lubricant?

A. Talc
B. Molybdenum disulphide
C. Graphite
D. None of these

Question 1192

The temperature at which a gas, when subjected to Joule-Thomson expansion, neither cools or heats up, is termed as the __________ temperature. Above this temperature the gas heats up on throttling and below this the gas cools down.

A. Isotactic
B. Saturation
C. Inversion
D. Throttling

Question 1193

Consideration of the creep is the most important in case of the

A. Blades of gas turbine
B. Piston of an I. C. engine
C. Flywheel of steam engine
D. Cycle chain

Question 1194

Friction factor for fluid flow in pipe does not depend upon the

A. Pipe length
B. Pipe roughness
C. Fluid density & viscosity
D. Mass flow rate of fluid

Question 1195

Good design of the casing of a centrifugal pump aims at minimising the

A. Cavitation
B. Frictional losses
C. Kinetic energy loss
D. Static head

Question 1196

Hard magnetic materials have high

A. Coercive force
B. Residual magnetic induction
C. Both A & B
D. Neither A nor B

Question 1197

Function of blow down valve in a boiler is to

A. Maintain the drum level
B. Keep the drum pressure constant
C. Drain out the sludge from the drum
D. Empty the boiler during shutdown

Question 1198

Cold working of a material results in increase in hardness, which is termed as the __________ hardening.

A. Cold
B. Work
C. Age
D. Induction

Question 1199

Use of economiser in a boiler plant reduces the fuel consumption for steam generation by about __________ percent.

A. 1
B. 10
C. 30
D. 45

Question 1200

Wohler test is a destructive test to find out the __________ strength of a prepared metal specimen.

A. Creep
B. Fatigue
C. Endurance
D. Tensile

Question 1201

Rain drops falling through atmospheric air attain limited terminal velocity, because of

A. Upward thrust due to air
B. Viscous force exerted by air
C. Surface tension effects of water
D. Force of gravity

Question 1202

__________ rubber is generally used for making 'O' rings used for vacuum sealings.

A. Natural
B. Neoprene
C. Butadiene
D. Nitrile

Question 1203

Gantt charts are used for streamlining the

A. Inventory control
B. Production schedule
C. Sales forecasting
D. Quality control

Question 1204

Maximum permissible air velocity in pipelines is about __________ metre/second.

A. 5
B. 10
C. 20
D. 40

Question 1205

The function of neutral flux used in the pyrometallurgy of metal extraction is to increase the __________ of the slag.

A. Fluidity
B. Basicity
C. Acidity
D. Viscosity

Question 1206

The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be

A. parabolic
B. hyperbolic
C. straight line
D. none of these

Question 1207

On being hit with a hammer, __________ will readily fracture.

A. Brass
B. Mild steel
C. Cast iron
D. Lead

Question 1208

Filler metal is not used in the __________ welding.

A. Seam
B. Electric spot
C. Projection
D. All of the above

Question 1209

The softness or hardness of a grinding wheel depends upon the type & amount of bonding material used. For general purpose cutter grinding __________ grinding wheel is normally used.

A. hard
B. soft
C. silicon carbide
D. aluminium oxide

Question 1210

The joint for soldering is supported by binding wire made of

A. Mild steel
B. Copper
C. Soft iron
D. Stainless steel

Question 1211

Principal alloying elements of cast tool alloys which have very high wear resistance & high temperature strength are

A. Cobalt, chromium & tungsten
B. Cobalt, chromium & nickel
C. Molybdenun, tungsten & chromium
D. Cobalt, zirconium & molybdenum

Question 1212

The product out from a cupola is called

A. wrought iron
B. pig iron
C. cast iron
D. none of these

Question 1213

Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?

A. Styrofoam
B. Lucite
C. Perspex
D. Plexiglass

Question 1214

__________ is a special constituent of chlorophyll without which photosynthesis is not possible.

A. Calcium
B. Nitrogen
C. Phosphorous
D. Hydrogen

Question 1215

The main charge in blast furnace is usually

A. Iron ore & coke
B. Iron ore, coke & air
C. Limestone, coke & iron ore
D. Limestone, sand & iron ore

Question 1216

The amount of water evaporated in kg per kg of fuel burnt in a boiler is called the __________ of a boiler.

A. Evaporative capacity
B. Evaporation efficiency
C. Thermal efficiency
D. Steam load

Question 1217

Square steel key is normally strong in failure by shear & crushing. Keys are normally made of __________ steel bars.

A. Hot rolled mild
B. Cold rolled mild
C. Forged
D. Machinable stainless

Question 1218

Boiler draught of 10 mm water column is equivalent to

A. 1 kgf/m²
B. 10 kgf/m²
C. 10 kgf/mm²
D. 1 kgf/mm²

Question 1219

Austempering process results in the formation of __________ structure.

A. Martensitic
B. Bainitic
C. Carburised
D. Stressed

Question 1220

When the wet steam is throttled but still remains wet at the exit of the throttle valve, then its temperature & dryness fraction respectively

A. Decreases & increases
B. Increases & increases
C. Increases & decreases
D. Decreases & decreases

Question 1221

All modes of heat transfer i.e., conduction, convection & radiation occur in case of the

A. Condensation of steam in a partial condenser
B. Boiler furnace
C. Insulated pipe car raying high pressure steam
D. None of these

Question 1222

Sacrificial anode method is used in the protection of pipelines which are buried underground. Sacrificial anode

A. Occurs higher in the electro-chemical series of metals
B. Is exemplified by magnesium plate
C. Is much cheaper than the cathodic base material to be guarded against corrosion
D. All of the above

Question 1223

Gross & Net calorific values will be the same for

A. Methane
B. Propane
C. Carbon monoxide
D. Hydrogen

Question 1224

Diamond does not conduct electricity, because

A. Its structure is very compact
B. No free electrons are present
C. It is of crystalline nature
D. There are only carbon atoms present

Question 1225

Stellite is a trade name for the

A. Cermets
B. Ferrous cast alloys
C. Non-ferrous cast alloys
D. Products made by powder metallurgy techniques

Question 1226

Alcohols are not suitable as diesel engine fuel because the cetane number of alcohols is

A. Very low which prevents their ignition by compression
B. Very high which prevents their ignition by compression
C. Zero
D. None of these

Question 1227

Water-tube boiler is the one, in which

A. Water passes through tubes and flue gases around it
B. Tube carrying hot flue gases are immersed in a pool of water
C. Tubes are placed in vertical position
D. None of these

Question 1228

Babbit lining is used on brass/bronze bearings to increase the

A. Antifriction properties
B. Compressive strength
C. Bearing resistance
D. Wear resistance

Question 1229

The value of y = cp/cv. at < 500°C for air & most common gases can be safely assumed to be

A. 0.8
B. 1
C. 1.4
D. 1.8

Question 1230

In chemical dehumidification of air

A. Both specific humidity & dry bulb temperature increases
B. Both specific humidity & dry bulb temperature decreases
C. Specific humidity decreases & dry bulb temperature increases
D. Specific humidity increases & dry bulb temperature decreases

Question 1231

Out of the following surfaces, the emis-sivity will be minimum for

A. Aluminium foil
B. Concrete
C. Plaster
D. Smooth glass

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