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
Which one of the following is incombustible ?
A. H2
B. CCl4
C. C2H2
D. S
Question 2
__________ 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 3
A high pressure boiler generates steam at a pressure greater than __________ kg/cm2 .
A. 10
B. 30
C. 50
D. 80
Question 4
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 5
A solar cell converts the sunlight directly into __________ energy.
A. thermal
B. electrical
C. mechanical
D. chemical
Question 6
Absolute zero pressure can be attained at a temperature of
A. 0°C
B. 50°K
C. 0°R
D. none of these
Question 7
All of the following alloying elements of steel increases hardness but sacrifice ductility, except
A. nickel
B. vanadium
C. molybdenum
D. chromium
Question 8
An alloy of Fe - 0.4 % C is
A. cast iron.
B. hypo-eutectoid steel.
C. hyper-eutectoid steel.
D. eutectoid steel
Question 9
Annealing ofwhite cast iron produces __________ iron.
A. grey
B. nodular
C. malleable
D. spheroidal
Question 10
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 11
Auto collimator is used to check
A. flatness
B. angle
C. rotor balancing
D. roughness
Question 12
Chromium molybdenum steel can not be welded using __________ welding.
A. thermit
B. electrical resistance
C. oxy-acetylene
D. any of these
Question 13
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 14
Copper deposits are found in India at the following location:
A. Kudremukh
B. Kolar
C. Khetri
D. Ramagundam
Question 15
Corrosion of metals can not be prevented by its
A. tempering
B. chromising
C. aluminising
D. alloying
Question 16
Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
A. 10-Mar
B. 103
C. Oct-15
D. l015
Question 17
Energy of the sun arises mainly from __________ reactions.
A. fusion
B. fission
C. combustion
D. none of these
Question 18
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 19
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 20
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 21
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 22
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 23
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 24
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 25
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 26
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 27
Machinability of hard alloys and tool steels is improved by
A. spherodising
B. annealing
C. tempering
D. normalising
Question 28
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 29
Maximum permissible air velocity in pipelines is about __________ metre/second.
A. 5
B. 10
C. 20
D. 40
Question 30
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 31
Nuclear fission of one atom of uranium-235 produces the energy equivalent to about __________ MeV.
A. 20
B. 200
C. 500
D. 1000
Question 32
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 33
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 34
Powder metallurgy process does not make metal powder by
A. atomisation
B. grinding/milling
C. hammering
D. electrolytic deposition
Question 35
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 36
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 37
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 38
The following type of bonding is strongly directional in solids.
A. Vander Waal's
B. Ionic
C. Metallic
D. Covalant
Question 39
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 40
The product out from a cupola is called
A. wrought iron
B. pig iron
C. cast iron
D. none of these
Question 41
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 42
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 43
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 44
Titanium alloys are welded using the Following process:
A. TIG welding.
B. Submerged arc welding.
C. Butt welding.
D. Electron beam welding.
Question 45
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 46
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 47
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 48
Which of the following is not an explosive ?
A. TNT
B. CMC
C. RDX
D. Lead azide
Question 49
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 50
Wrought iron is never shaped by
A. casting
B. cold working
C. forging
D. welding
Question 51
A hot short metal is
A. Hard when hot
B. Brittle when cold
C. Brittle when hot
D. Brittle under all conditions
Question 52
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 53
A static fluid can not have
A. Zero shear stress
B. Positive normal stress
C. Non-zero shear stress
D. None of these
Question 54
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 55
Aluminium oxide (an abrasive) is used for grinding
A. Ceramics
B. High speed steel
C. Cemented carbide
D. None of these
Question 56
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 57
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 58
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 59
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 60
__________ 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 61
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 62
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 63
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 64
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 65
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 66
The main reducing agent in iron blast furnace is
A. Carbon dioxide
B. Carbon monoxide
C. Oxygen
D. Air
Question 67
Main constituent of bone ash is
A. Ammonium phosphate
B. Calcium phosphate
C. Animal charcoal
D. Ammonium sulphate
Question 68
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 69
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 70
The product of a commercial direct reduction process is
A. Liquid iron
B. Solid iron
C. Sponge iron
D. Iron saturated with carbon
Question 71
__________ flux is used for the extraction of metal from its self fluxing ores.
A. No
B. Acid
C. Basic
D. Neutral
Question 72
Metals in general have a low value of thermal
A. Conductivity
B. Diffusivity
C. Inertia
D. All of the above
Question 73
The machanism involved in the removal of metal in drilling operation is by
A. Compression
B. Extrusion
C. Shearing
D. Both A & C
Question 74
Spheriodising of a material is a/an __________ process.
A. Normalising
B. Annealing
C. Tempering
D. Hardening
Question 75
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 76
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 77
Nuclear fission of one atom of uranium⁻²35 produces the energy equivalent to about __________ MeV.
A. 20
B. 200
C. 500
D. 1000
Question 78
Fahrenheit and Centigrade scales have the same readings at
A. -55°
B. -40°
C. -33°
D. -58°
Question 79
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 80
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 81
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 82
Work study deals with the __________ study.
A. Time
B. Motion
C. Both A & B
D. Neither A nor B
Question 83
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 84
Larger length & diameter water pipes are made by
A. Electrical resistance welding
B. Die casting
C. Semi-centrifugal casting
D. Continuous casting
Question 85
Tumbling is the process of improving the __________ of the materials/parts.
A. Surface finish
B. Fatigue limit
C. Creep limit
D. Surface cleanlineses
Question 86
Ammonia gas can be dried by
A. PCl₅
B. Quick lime
C. CaCl₂
D. Concentrated H₂SO₄
Question 87
Natural water contains approximately __________ percent of heavy water.
A. 0.015
B. 0.71
C. 1.2
D. 3.5
Question 88
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 89
Isotropic materials have the same __________ in all the directions.
A. Thermal properties
B. Elastic properties
C. Stresses
D. All of the above
Question 90
An alloy of Fe - 0.4 % C is
A. Cast iron
B. Hypo-eutectoid steel
C. Hyper-eutectoid steel
D. Eutectoid steel
Question 91
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 92
An ideal fluid is
A. Viscous & incompressible
B. Non-viscous & compressible
C. Non-viscous & incompressible
D. Viscous & compressible
Question 93
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 94
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 95
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 96
__________ is the most suitable lubricant for drawing mild steel wires?
A. Kerosene
B. Water
C. Sodium stearate
D. Lime water
Question 97
On being hit with a hammer, __________ will readily fracture.
A. Brass
B. Mild steel
C. Cast iron
D. Lead
Question 98
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 99
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 100
Ignition of fuel in a diesel engine is by
A. Spark
B. Hot compressed air
C. Fuel injection
D. None of these
Question 101
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 102
Blast furnace slag is mainly molten
A. Sand
B. Magnesium silicate
C. Calcium silicate
D. Iron pyrite
Question 103
The term 'Value' in value engineering technique refers to the __________ cost of the product.
A. Function (utility)
B. Selling
C. Production
D. Total
Question 104
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 105
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 106
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 107
__________ can not be forged.
A. High speed/carbon steel
B. Cast iron
C. Wrought iron
D. Mild steel
Question 108
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 109
Production of one ton of paper in Indian paper industry consumes about __________ kWh of electricity.
A. 300
B. 800
C. 1400
D. 2000
Question 110
Which of the following welding processes employs the highest welding temperature ?
A. Arc welding
B. Gas welding
C. Thermit welding
D. Resistance welding
Question 111
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 112
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 113
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 114
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 115
__________ 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 116
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 117
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 118
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 119
Laser welding is widely employed in the __________ industries.
A. Electronic
B. Structural
C. Process
D. Heavy
Question 120
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 121
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 122
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 123
M10 index of coke indicates its
A. Compressive strength
B. Hardness
C. Abrasion resistance
D. Impact strength
Question 124
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 125
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 126
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 127
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 128
Milk is fat dispersed in water. It is an example of
A. Suspension
B. Emulsion
C. Gel
D. Solution
Question 129
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 130
The velocity of sound in air is independent of changes in its
A. Humidity
B. Pressure
C. Temperature
D. None of these
Question 131
Which of the following is not a charge material for cupola ?
A. Limestone
B. Iron scrap
C. Iron ore
D. Pig iron
Question 132
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 133
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 134
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 135
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 136
Steel produced from phosphatic iron is __________ in nature.
A. Malleable
B. Ductile
C. Brittle
D. Tough
Question 137
Swaging is a/an __________ operation.
A. Piercing
B. Forging
C. Extrusion
D. Drawing
Question 138
Thermal efficiency of an internal combustion engine is around __________ percent.
A. 8
B. 35
C. 65
D. 80
Question 139
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 140
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 141
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 142
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 143
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 144
Which of the following phenomenon/ phenomena is/are diffusion controlled ?
A. Dislocation climb
B. Cross-slip
C. Twinning
D. Recrystallisation
Question 145
Shaft/rotor speed is most accurately measured by a
A. Frequency counter
B. Tachometer
C. Strobometer
D. Speedometer
Question 146
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 147
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 148
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 149
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 150
Presence of small quantity of sulphur in low carbon steel improves its
A. Formability
B. Machinability
C. Weldability
D. Hardenarality
Question 151
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 152
A suitable lubricant used for watches is
A. Metallic soap solution
B. Grease
C. Palm oil
D. Hazel-nut oil
Question 153
Which of the following metals is the most prone to work hardening?
A. Brass
B. Aluminium
C. Copper
D. Lead
Question 154
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 155
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 156
__________ is not a heat treatment process.
A. Cyaniding
B. Pakerising
C. Austempering
D. Martempering
Question 157
Tempering of a material does not improve its
A. Machinability
B. Toughness
C. Internal stress level
D. Softness
Question 158
Nitrogen is not an essential component of
A. Protein
B. Urea
C. Oils & fats
D. Any of these
Question 159
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 160
What is the value of included angle of a triangular notch for maximum discharge ?
A. 30°
B. 60°
C. 90°
D. 120°
Question 161
Which of the following materials has the maximum shrinkage allowance ?
A. Brass
B. Cast iron
C. Lead
D. Aluminium alloy
Question 162
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 163
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 164
Source of heat supply in a cupola is
A. Coke
B. Charcoal
C. Lumpy coal
D. Pulverised coal
Question 165
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 166
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 167
Which of the following heat treatment processes is usually applied to castings ?
A. Tempering
B. Annealing
C. Normalising
D. Carburising
Question 168
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 169
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 170
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 171
Buoyancy force depends on the __________ the liquid.
A. Depth of immersion in
B. Displaced mass of
C. Surface tension of
D. Viscosity of
Question 172
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 173
Which one is neutral in character ?
A. N₂O₄
B. N₂O
C. N₂O₅
D. N₂O₃
Question 174
Dezincification is a form of corrosion, which specifically applies to
A. Steel
B. Brass
C. Stainless steel
D. Babbit metal
Question 175
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 176
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 177
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 178
__________ is the most important element, which controls the physical properties of steel.
A. Manganese
B. Silicon
C. Carbon
D. Vanadium
Question 179
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 180
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 181
__________ of air does not increase with increase in temperature.
A. Density
B. Thermal diffusivity
C. Viscosity
D. Thermal conductivity
Question 182
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 183
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 184
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 185
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 186
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 187
To improve the machinability of steel, it is generally subjected to
A. Spherodising
B. Tempering
C. Normalising
D. Annealing
Question 188
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 189
Out of the following, the most ductile material is
A. Mild steel
B. Copper
C. Nickel
D. Aluminium
Question 190
Lime contains about 90% CaO. Percentage CaO present in limestone is about
A. 25
B. 50
C. 70
D. 80
Question 191
Limestone addition in the blast furnace is done to flux __________ present in the raw materials.
A. SiO₂
B. Al2O₃
C. MnO₂
D. P
Question 192
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 193
The most detrimental impurity in high pressure boiler feed water is
A. Suspended salt
B. Dissolved salt
C. Silica
D. Turbidity
Question 194
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 195
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 196
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 197
Which of the following metals reacts violently with water ?
A. Mercury
B. Sodium
C. Calcium
D. Magnesium
Question 198
Lead is added to 60:40 brass primarily to improve
A. Machinability
B. Corrosion resistance
C. Fluidity
D. Strength
Question 199
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 200
Specific __________ is a dimensionless quantity.
A. Heat
B. Humidity
C. Weight
D. None of these
Question 201
Silicon crystal can be converted to p-type semi-conductor by doping with
A. Phosphorous
B. Nitrogen
C. Carbon
D. Boron
Question 202
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 203
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 204
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 205
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 206
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 207
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 208
Deformation band is absent in materials having __________ lattice crystal structure.
A. Fcc
B. Bcc
C. Hcp
D. None of these
Question 209
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 210
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 211
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 212
A psychrometer does not measure the __________ temperature of moist air.
A. Dew point
B. Dry bulb
C. Wet bulb
D. None of these
Question 213
Carnot cycle is also termed as the constant __________ cycle in thermodynamics.
A. Entropy
B. Pressure
C. Volume
D. Heat
Question 214
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 215
Grain hardness is measured by the __________ hardness testing method.
A. Knoop
B. Rockwell F
C. Shore sceleroscope
D. Vicker's
Question 216
Factor of safety is the ratio of the __________ stress to the working stress.
A. Tensile
B. Compressive
C. Yield
D. Bearing
Question 217
Out of the following, the joint produced by __________ has the lowest strength.
A. Soldering
B. Welding
C. Brazing
D. Rivetting
Question 218
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 219
Corrosion rate can not be lowered by reducing the __________ of the corroding medium.
A. Concentration
B. Velocity
C. Temperature
D. None of these
Question 220
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 221
1% concentration of water vapor in air is equivalent to __________ ppm (parts per million).
A. 10000
B. 1000
C. 100
D. 10
Question 222
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 223
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 224
Eutectoid reaction for iron-carbon system occurs at a temperature of __________ °C.
A. 597
B. 959
C. 1147
D. 1493
Question 225
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 226
Eutectic reaction for iron-carbon system occurs at a temperature of __________ °C.
A. 723
B. 959
C. 1147
D. 1493
Question 227
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 228
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 229
Super conduction in metals is observed at a temperature of __________ °K.
A. <100
B. >100
C. About 273
D. About 373
Question 230
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 231
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 232
Isotropic materials have the same __________ in all directions.
A. Induced stresses
B. Density
C. Elastic properties
D. Thermal properties
Question 233
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 234
Carbon is present in the form of __________ in grey cast iron.
A. Spheroids
B. Nodular aggregates of graphite
C. Flakes
D. Cementite
Question 235
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 236
First empirical temperature scale conceived is the __________ temperature scale.
A. Absolute
B. Reaumer
C. Farenhite
D. Celcius
Question 237
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 238
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 239
Notched bar test is used for testing the __________ of a material.
A. Impact strength
B. Endurance limit
C. Machinability
D. Corrosion resistance
Question 240
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 241
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 242
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 243
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 244
Alloys having more than 80% copper are generally more
A. Abrasion resistant
B. Corrosion resistant
C. Prone to season cracking
D. Machinable
Question 245
Out of the following, the dimensionless quantity is
A. Specific weight
B. Viscosity
C. Mach number
D. Density
Question 246
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 247
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 248
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 249
__________ 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 250
Fatigue resistance of a material is measured by the
A. Elastic limit
B. Ultimate tensile strength
C. Young's modulus
D. Endurance limit
Question 251
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 252
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 253
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 254
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 255
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 256
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 257
__________ of hard alloy and tool steel is done to make it easily machinable.
A. Case carburising
B. Tempering
C. Normalising
D. Annealing
Question 258
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 259
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 260
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 261
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 262
Castability of aluminium is increased by the addition of __________ in it.
A. Silicon
B. Manganese
C. Bismuth
D. Lead
Question 263
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 264
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 265
__________ can replace tungsten in high speed steel.
A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum
Question 266
Chlorine acts as a bleaching agent only in the presence of
A. Dry air
B. Pure oxygen
C. Moisture
D. Sunlight
Question 267
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 268
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 269
A jig is used while __________ a hole.
A. Boring
B. Counter boring
C. Drilling
D. Enlarging
Question 270
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 271
Specific heat of an ideal gas depends upon its
A. Molecular weight
B. Pressure
C. Temperature
D. Volume
Question 272
Rankine cycle comprises of two isothermal and two __________ processes.
A. Isobaric
B. Polytropic
C. Isentropic
D. None of these
Question 273
__________ iron is produced by the annealing of white cast iron.
A. Malleable
B. Nodular
C. Ductile
D. Grey
Question 274
Angular displacement can be measured suitably by a
A. Shaft encoder
B. Linear variable differential transducer (LVDT)
C. Stroboscope
D. Tachometer
Question 275
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 276
Gantt charts are used for streamlining the
A. Inventory control
B. Production schedule
C. Sales forecasting
D. Quality control
Question 277
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 278
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 279
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 280
Copper is not present as an alloying constituent in
A. Silicon bronze
B. Constantan
C. Nichrome
D. Delta metal
Question 281
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 282
Kinematic viscosity of water as compared to that of air is
A. More
B. Same
C. 15% more
D. 15% less
Question 283
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 284
Cold chiesel & hammers are made of
A. High speed steel
B. High carbon steel
C. Forged steel
D. Mild steel
Question 285
__________ test can be termed as the semi-distructive test.
A. Impact
B. Torsion
C. Hardness
D. Charpy
Question 286
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 287
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 288
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 289
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 290
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 291
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 292
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 293
Lead is poured into the joint between two __________ pipes.
A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement
Question 294
In the Bayer's process, bauxite is digested under pressure using
A. H₂SO₄
B. NaOH
C. NH₃
D. HCl
Question 295
Lead is poured into the joints between two __________ pipes.
A. Cast iron
B. Steel
C. Concrete
D. Plastic
Question 296
__________ forces do not act in case of fluids.
A. Vibratory
B. Centrifugal
C. Elastic
D. Tensile
Question 297
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 298
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 299
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 300
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 301
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 302
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 303
Milligram of KOH required to saponify 1 gm of oil is called its __________ number.
A. Saponification
B. Acid
C. Precipitation
D. Emulsion
Question 304
Surface tension is due to the __________ forces.
A. Viscous
B. Adhesive
C. Cohesive
D. All of these
Question 305
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 306
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 307
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 308
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 309
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 310
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 311
Austenite is not
A. Ductile
B. Malleable
C. Magnetic
D. Soft
Question 312
Which of the following is a unit of time ?
A. Barn
B. Light year
C. Angstrom
D. None of these
Question 313
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 314
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 315
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 316
Which of the following has the highest density and the lowest melting point ?
A. Stainless steel
B. Titanium
C. Lead
D. Aluminium
Question 317
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 318
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 319
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 320
Annealing of cast iron
A. Softens it to facilitate machining
B. Decreases the free carbon
C. Increases the strength
D. None of these
Question 321
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 322
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 323
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 324
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 325
Resilience of a bolt can be increased by increasing its
A. Length
B. Shank diameter
C. Head diameter
D. None of these
Question 326
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 327
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 328
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 329
Unit molar solution of __________ is the best conductor of electricity.
A. Sodium chloride
B. Acetic acid
C. Sulphuric acid
D. Sucrose
Question 330
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 331
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 332
Lead is poured into the joint between two- __________ pipes.
A. Mild steel
B. Concrete
C. Cast iron
D. Asbestos cement
Question 333
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 334
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 335
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 336
A spark ignition petrol engine has
A. Throttle valve
B. Carburettor
C. Both A & B
D. Neither A nor B
Question 337
__________ 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 338
__________ joint is mostly used for joining pipes carrying water at low pressure.
A. Nipple
B. Socket
C. Union
D. Bell and spigot
Question 339
Blast furnace is a
A. Counter current reactor
B. Co-current reactor
C. Cross-current reactor
D. Combination of all the three
Question 340
Quartz is a __________ material.
A. Diamagnetic
B. Ferromagnetic
C. Ferroelectric
D. Piezoelectric
Question 341
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 342
__________ 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 343
Cast iron has the unique property of high
A. Ductility
B. Damping characteristics
C. Hardness
D. Malleability
Question 344
An atom bomb works on the principle of
A. Nuclear fission
B. Nuclear fusion
C. Both the nuclear fission & fusion
D. Ionisation
Question 345
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 346
Damage to metal surface by mechanical action is called
A. Pitting
B. Corrosion
C. Erosion
D. None of these
Question 347
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 348
Screws are specified by their __________ diameters.
A. Minor
B. Major
C. Pitch
D. None of these
Question 349
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 350
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 351
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 352
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 353
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 354
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 355
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 356
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 357
Most of the phosphorous present in the blast furnace burden enters into
A. Hot metal
B. Flue gases
C. Slag
D. Refractory lining
Question 358
Streaklines, streamlines & pathlines are almost identical for __________ fluid flow.
A. Ideal
B. Uniform
C. Steady
D. None of these
Question 359
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 360
__________ 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 361
Thermoplastics are never moulded using
A. Injection moulding
B. Blow moulding
C. Extrusion
D. Compression moulding
Question 362
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 363
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 364
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 365
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 366
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 367
The majority charge carriers in p-type silicon are
A. Free electrons
B. Ions
C. Conduction electrons
D. Holes
Question 368
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 369
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 370
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 371
__________ test is the appropriate test to determine whether a material is ductile or brittle.
A. Impact
B. Cupping
C. Hardness
D. Tensile
Question 372
Case hardening is not done by
A. Nitriding
B. Hot dipping
C. Electroplating
D. Both B & C
Question 373
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 374
Cassiterite is an ore of
A. Tin
B. Lead
C. Molybdenum
D. Chromium
Question 375
__________ can not increase the fatigue strength of a material.
A. Grain refining
B. Grain coarsening
C. Surface hardening
D. Shot peening
Question 376
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 377
Austempering process results in the formation of __________ structure.
A. Martensitic
B. Bainitic
C. Carburised
D. Stressed
Question 378
Force between the molecules of the same substance is called __________ force.
A. Adhesive
B. Cohesive
C. Molecular
D. Vander Walls
Question 379
Primary designation of steel is based on its
A. Hardness & tensile strength
B. Carbon content
C. Iron content
D. Alloying elements content
Question 380
The trace metal present in insulin is
A. Cu
B. Zn
C. Fe
D. Ni
Question 381
Dislocations are __________ defects.
A. Point
B. Line
C. Volume
D. None of these
Question 382
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 383
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 384
Bad odour in sanitary latrines is reduced by periodically sprinkling
A. Bleaching powder
B. Lime powder
C. Aluminium sulphate
D. None of these
Question 385
The most commonly used moderator in nuclear power plant is
A. Graphite
B. Light water
C. Heavy water
D. Berellium
Question 386
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 387
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 388
The preferred alloying element for low temperature applications of steel is
A. Cr
B. N
C. Mo
D. Ni
Question 389
Which of the following manufacturing processes produces the strongest components ?
A. Forging
B. Cold rolling
C. Hot rolling
D. Die casting
Question 390
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 391
Percentage of gaunge is maximum in the ore of
A. Iron
B. Gold
C. Zinc
D. Copper
Question 392
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 393
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 394
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 395
Which is the most lethal weapon ?
A. Atom (fusion) bomb
B. Hydrogen bomb
C. Cobalt bomb
D. Neutron bomb
Question 396
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 397
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 398
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 399
Gratings is associated with the measurement of
A. Linear displacement
B. Concavity/convexity
C. Surface texture
D. Flatness
Question 400
Nickel is a __________ material.
A. Ferromagnetic
B. Semi-conductor
C. Paramagnetic
D. Ferroelectric
Question 401
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 402
Coarse grained steels have
A. Low toughness
B. No tendency to distort
C. High density
D. Very high toughness
Question 403
Fibrous fracture is normally encountered in the __________ materials.
A. Hard
B. Elastic
C. Ductile
D. Brittle
Question 404
Colloids can be purified by
A. Dialysis
B. Reverse osmosis
C. Coagulation
D. Peptization
Question 405
Wood is a/an __________ material.
A. Amorphous
B. Cellular
C. Homogeneous
D. Grannular
Question 406
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 407
Lead is most readily dissolved in
A. Acetic acid
B. Hydrochloric acid
C. Nitric acid
D. Sulphuric acid
Question 408
Holes in a plate for rivetted joints is preferably made by
A. Drilling
B. Tapping
C. Reaming
D. Punching
Question 409
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 410
Hard magnetic materials have high
A. Coercive force
B. Residual magnetic induction
C. Both A & B
D. Neither A nor B
Question 411
Cast iron compared to steel is better in
A. Ductility
B. Strength
C. Malleability
D. Fluidity & castability
Question 412
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 413
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 414
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 415
Constituents of stellite are
A. Zinc, copper & nickel
B. Cobalt, chromium & tungsten
C. Zinc, aluminium & nickel
D. Nickel, cobalt & vanadium
Question 416
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 417
__________ is not used as a material of construction in thermocouples.
A. Alumel
B. Rhodium
C. Constantan
D. Duralumin
Question 418
Ganister contains maximum percentage of
A. FeO
B. SiO₂
C. MgO
D. MnO₂
Question 419
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 420
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 421
Tungsten in high speed steel is responsible for its
A. Toughness & wear resistance
B. Cold hardness
C. Hot hardness
D. Sharp cutting edge
Question 422
Corrosion is
A. A physical phenomenon
B. A chemical phenomenon
C. Same as erosion
D. An uncontrollable phenomenon
Question 423
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 424
Titanium alloys are welded using the Following process:
A. TIG welding
B. Submerged arc welding
C. Butt welding
D. Electron beam welding
Question 425
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 426
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 427
Ester is formed, when an alcohol reacts with
A. Carboxylic acid
B. Aldehyde
C. Ketone
D. Ether
Question 428
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 429
A jet engine turbine blade is normally manufactured by
A. Forging
B. Shell moulding
C. Investment casting
D. Pressure die casting
Question 430
Out of the following the refractive index is the highest for
A. Glass
B. Diamond
C. Brine
D. Kerosene
Question 431
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 432
Compressed dry air is used as the cutting fluid, while machining
A. Steel
B. Cast iron
C. Aluminium
D. None of these
Question 433
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 434
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 435
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 436
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 437
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 438
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 439
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 440
Pressure exerted by a liquid depends upon its
A. Surface tension
B. Density
C. Viscosity
D. Buoyancy
Question 441
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 442
Scab is a defect developed during __________ of metals.
A. Forging
B. Sand casting
C. Machining
D. Welding
Question 443
Desalination of water
A. Makes it potable
B. Makes it non-potable
C. Means distillation of water
D. None of these
Question 444
Puddling process is used for converting pig iron into
A. Cast iron
B. Wrought iron
C. Mild steel
D. Semi-steel
Question 445
Dew point of air indicates its
A. Moisture content
B. Dryness
C. Latent heat
D. Coolness
Question 446
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 447
Metal shots used in shot blasting are made of
A. Stellite
B. Steel
C. Bronze
D. Lead
Question 448
__________ remains constant during the adiabatic cooling of moist air.
A. Wet bulb temperature
B. Dry bulb temperature
C. Relative humidity
D. Specific humidity
Question 449
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 450
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 451
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 452
Which of the following is an acidic constituent of B.F. slag ?
A. SiO₂
B. FeO
C. MgO
D. CaO
Question 453
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 454
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 455
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 456
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 457
Largest application of laser welding is in __________ welding.
A. Microspot
B. Under water
C. Precious metals
D. Heavy structure
Question 458
Out of the following __________ iron has the best capability to bear sudden & excessive shocks.
A. White
B. Cast
C. Wrought
D. Pig
Question 459
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 460
A dense structure of grinding wheel is not used for the
A. Ductile material
B. Hard materials
C. Brittle materials
D. Finishing cuts
Question 461
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 462
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 463
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 464
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 465
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 466
X-rays do not exhibit the property of
A. Reflection
B. Scattering
C. Diffraction
D. Dispersion
Question 467
A high pressure boiler generates steam at a pressure greater than __________ kg/cm² .
A. 10
B. 30
C. 50
D. 80
Question 468
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 469
For a first order chemical reaction, the concentration of the reactant decreases __________ with time.
A. Linearly
B. Exponentially
C. Logarithmically
D. Inversely
Question 470
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 471
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 472
Drills are usually made of
A. Cermets
B. High speed steel
C. Alloy steel
D. Tungsten carbide
Question 473
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 474
Which drug is made from vegetables ?
A. Pencilin
B. Aspirin
C. Quinine
D. Insulin
Question 475
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 476
Titanium is produced by __________ of Ti Cl₄.
A. Electrolytic reduction
B. Calcium reduction
C. Magnesium reduction
D. Thermal dissociation
Question 477
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 478
Globular form of cementite is formed during the __________ process.
A. Spherodising
B. Hardening
C. Annealing
D. Normalising
Question 479
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 480
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 481
The speed of sound will be maximum in
A. Vacuum
B. Metal
C. Air
D. Water
Question 482
Dew point temperature always gives an indication of the __________ of the moist air.
A. Dryness
B. Moisture content
C. Coolness
D. Latent heat
Question 483
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 484
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 485
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 486
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 487
Steel is welded using the __________ flame.
A. Carburising
B. Neutral
C. Oxidising
D. All of the above
Question 488
Which of the following is a disaccharide?
A. Lactose
B. Starch
C. Cellulose
D. Fructose
Question 489
Reduction reaction involves the
A. Loss of electrons
B. Increase in oxidation number
C. Gain of electrons
D. Addition of oxygen
Question 490
Which one of the following is incombustible ?
A. H₂
B. CCl₄
C. C₂H₂
D. S
Question 491
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 492
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 493
Nitriding of a steel part does not increase its
A. Grain size
B. Fatigue limit
C. Surface hardness
D. Wear resistance
Question 494
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 495
Nickel and __________ are the alloying element added in steel to increase its toughness.
A. Molybdenum
B. Chromium
C. Vanadium
D. Silicon
Question 496
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 497
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 498
__________ has a negative co-efficient of linear expansion.
A. Iron
B. Copper
C. Rubber
D. Nickel
Question 499
Iron content in Indian iron ore is about __________ percent.
A. 80-85
B. 60-65
C. 40-45
D. 20-25
Question 500
__________ cycle is the most efficient thermodynamic cycle.
A. Diesel
B. Otto
C. Rankine
D. Carnot
Question 501
Suitability of steel for its use in cable is judged by its strength in
A. Tension
B. Compression
C. Torsion
D. Shear
Question 502
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 503
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 504
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 505
Which of the following contains the least percentage of carbon ?
A. Pig iron
B. Wrought iron
C. Cast iron
D. Malleable iron
Question 506
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 507
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 508
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 509
The main constituent of bones is
A. CaF₂
B. Ca₃(PO₄)₂
C. CaCO₃
D. CaCl₂
Question 510
Material of construction of the electrode used in the electric resistance welding is
A. Stainless steel
B. Graphite
C. Copper
D. Steel
Question 511
The tensile load-elongation curve of a metal does not describe
A. Work hardening
B. Yield stress
C. Anisotropy index
D. Necking strain
Question 512
Silicon percentage in silicon steel used for electrical equipments is about
A. 1
B. 4
C. 8
D. 14
Question 513
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 514
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 515
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 516
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 517
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 518
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 519
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 520
Which of the following does not lower the surface tension of liquids ?
A. Fat
B. Soap
C. Detergent
D. Surfactant
Question 521
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 522
Thermal expansion of solid is employed in the temperature measurement by a
A. Bimetallic thermometer
B. Thermocouple
C. Mercury thermometer
D. Resistance thermometer
Question 523
Liquid nitrogen containers can be made from
A. Ferritic stainless steel
B. HSLA steel
C. Titanium
D. Austenitic stainless steel
Question 524
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 525
According to thermodynamic Farenhite scale, the fundamental interval between ice point to steam point is
A. 180°
B. 212°
C. 32°
D. 273°
Question 526
Strain hardening effect in a metal subjected to cold working is due to the __________ mechanism.
A. Fracture
B. Dislocation
C. Slip
D. Twinning
Question 527
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 528
Strain hardening effect in metals subjected to cold working is due to the __________ mechanism.
A. Slip
B. Fracture
C. Winning
D. Dislocation
Question 529
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 530
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 531
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 532
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 533
Addition of __________ to steel can not impart it high strength at elevated temperature.
A. Nickel
B. Magnesium
C. Silicon
D. Manganese
Question 534
Lead percentage in pure galena is about
A. 8.6
B. 86.6
C. 35.8
D. 61.4
Question 535
When a copper ball is heated, the largest percentage increase will be in its
A. Radius
B. Area
C. Mass
D. Volume
Question 536
Ceramic tips for the cutting tool are prepared from __________ powder.
A. Carbon
B. Silicon carbide
C. Aluminium oxide
D. Tungsten
Question 537
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 538
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 539
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 540
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 541
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 542
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 543
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 544
Property responsible for the talcum powder to cling to the skin is the
A. Capillary action
B. Adhesion
C. Cohesion
D. Surface tension
Question 545
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 546
Increasing the temperature of a material makes it
A. Harder
B. Softer
C. Tougher
D. Stronger
Question 547
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 548
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 549
Thermal diffusivity of a substance is proportional to (where, k = Thermal conductivity)
A. 1/k
B. k
C. k²
D. 1/k²
Question 550
The underground well of a biogas plant is called the
A. Septic tank
B. Oxidation well
C. Digestor
D. Lagoon
Question 551
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 552
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 553
Thermal conductivity of a material does not depend upon its
A. Mass
B. Volume
C. Surface area
D. All of the above
Question 554
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 555
Steel containing low percentage of nickel, chromium & tungsten are termed as the __________ steel.
A. Wrought
B. Tool
C. Alloy
D. Plain carbon
Question 556
Number of electrons in the outermost shell of a semi-conductor material is
A. 2
B. 4
C. 6
D. 8
Question 557
Which of the following is termed as the boiler mounting ?
A. Feed water pump
B. Steam superheater
C. Blow off cock
D. Economiser
Question 558
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 559
Which of the following is termed as the boiler mounting ?
A. Superheater
B. Economiser
C. Blow off cock
D. Feed pump
Question 560
__________ 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 561
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 562
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 563
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 564
Window panes of aeroplanes are normally made of
A. Perspex (PMMA)
B. Teflon (PTFE)
C. Bakelite (phenol formaldehyde)
D. Polystyrene
Question 565
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 566
Viscoelastic behaviour is observed in __________ materials.
A. Non-crystalline organic polymeric
B. Ceramic
C. All crystalline
D. All of the above
Question 567
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 568
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 569
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 570
The type of pump used for lifting large quantity of sewage is a __________ pump.
A. Gear
B. Centrifugal
C. Reciprocating
D. Plunger
Question 571
Hot & cold working of material causes its __________ deformation.
A. Visco-elastic
B. Isotropic
C. Elastic
D. Plastic
Question 572
Presence of sulphur in steel reduces the
A. Hardness
B. Grain size
C. Tensile strength
D. Toughness & transverse ductility
Question 573
__________ of austenite decreases the hardenability in steel.
A. Fine grains
B. Coarse grains
C. Homogeneity
D. Dissolved elements (except cobalt)
Question 574
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 575
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 576
Ice point' is designated on Farenhite temperature scale by
A. 0°
B. 32°
C. 62°
D. 212°
Question 577
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 578
Safety matches is produced using
A. Red phosphorus
B. Yellow phosphorus
C. Black phosphorus
D. Elemental sulphur
Question 579
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 580
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 581
The rolling process can not be used to produce
A. Plates
B. Rods
C. Tubes
D. Wires
Question 582
Material having negative co-efficient of linear expansion is
A. Copper
B. Aluminium
C. Rubber
D. Nickel
Question 583
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 584
Fine grained steels have
A. High brittleness
B. Higher tendency to distort
C. High ductility
D. None of these
Question 585
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 586
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 587
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 588
Styrofoam is the commercial name of
A. Polyurathene
B. Polystyrene
C. Polyacrylonitrile
D. Polybutadiene
Question 589
Which of the following is an inedible oil ?
A. Corn oil
B. Tallow oil
C. Olive oil
D. Cotton seed oil
Question 590
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 591
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 592
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 593
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 594
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 595
__________ number is sometimes used in place of Grashoff number in free convection heat transfer.
A. Stanton
B. Brinkman
C. Rayleigh
D. Nusselt
Question 596
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 597
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 598
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 599
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 600
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 601
Function of gear box is to
A. Reduce the speed
B. Obtain variable speed
C. Increase the speed
D. Produce high torque
Question 602
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 603
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 604
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 605
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 606
Which of the following gases cause global warming?
A. Carbon monoxide
B. Carbon dioxide
C. Nitrogen
D. Ozone
Question 607
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 608
Principal alloying element in Elinvar (used for making hair springs for watches) is
A. Copper
B. Aluminium
C. Nickel
D. Zinc
Question 609
__________ addition increases the depth of hardness of steel.
A. Chromium
B. Nickel
C. Tungsten
D. Vanadium
Question 610
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 611
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 612
The life of a ball bearing is inversely proportional to
A. (load)1
B. (load)2
C. (load)3
D. (load)0.33
Question 613
Out of the following, the __________ pipe has the least corrosion resistance.
A. Mild steel
B. Copper
C. Cast iron
D. Wrought iron
Question 614
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 615
Electrical conductivities of semi-conductors are of the order of __________ ohm/cm.
A. 10-3
B. 103
C. 10-15
D. L015
Question 616
Which of the following is not an ore of aluminium?
A. Troosite
B. Kaolin
C. Alunite
D. Cryolite
Question 617
Which of the following is not categorised as the ore agglomeration process?
A. Nodulising
B. Pelletising
C. Balling
D. Briquetting
Question 618
Matte smelting is used in the extraction of
A. Lead
B. Zinc
C. Aluminium
D. Copper
Question 619
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 620
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 621
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 622
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 623
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 624
Superheating of steam is done at constant
A. Enthalpy
B. Entropy
C. Pressure
D. Volume
Question 625
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 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
Gas carrying pipelines are best joined by
A. Nuts & bolts
B. Rivetting
C. Welding
D. None of these
Question 628
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 629
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 630
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 631
Which of the following materials does not form adherent oxide film on surface?
A. Copper
B. Nickel
C. Aluminium
D. Gold & silver
Question 632
Broaching tools are usually made of
A. Cermets
B. High speed steel
C. Tungsten carbide
D. Stellite
Question 633
Galena is an ore of
A. Iron
B. Copper
C. Lead
D. Aluminium
Question 634
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 635
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 636
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 637
__________ is a special constituent of chlorophyll without which photosynthesis is not possible.
A. Calcium
B. Nitrogen
C. Phosphorous
D. Hydrogen
Question 638
Age hardening is connected with
A. Babbit metal
B. Gun metal
C. Stainless steel
D. Duralumin
Question 639
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 640
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 641
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 642
Heat release during phase change is observed in case of a/an
A. Boiler
B. Condenser
C. Evaporator
D. All of the above
Question 643
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 644
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 645
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 646
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 647
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 648
Hydrocyclone is a
A. Crusher
B. Wet classifier
C. Dry classifier
D. Magnetic separator
Question 649
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 650
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 651
Knocking tendency in a petrol engine decreases with increasing
A. Supercharging
B. Compression ratio
C. Wall temperature
D. Engine speed
Question 652
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 653
Glass reacts with
A. H₂SO₃
B. HF
C. HNO₃
D. K₂Cr₂O₇
Question 654
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 655
The conventional mechnical transducer, which converts pressure signal to displacement signal is
A. Spring
B. Manometer
C. Strain gauge
D. None of these
Question 656
Gross & Net calorific values will be the same for
A. Methane
B. Propane
C. Carbon monoxide
D. Hydrogen
Question 657
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 658
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 659
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 660
A fine grained grinding wheel should not be used for grinding __________ materials.
A. Hard
B. Brittle
C. Soft & ductile
D. None of these
Question 661
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 662
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 663
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 664
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 665
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 666
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 667
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 668
Addition of silicon to aluminium improves its
A. Corrosion resistance
B. Machinability
C. Castability
D. None of these
Question 669
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 670
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 671
The primary strengthening mechanism in 70 : 30 brass is the
A. Solid solution strengthening
B. Precipitation hardening
C. Dispersion strengthening
D. Order hardening
Question 672
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 673
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 674
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 675
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 676
The refrigerant freon-12 is chemically
A. CCl₂F₂
B. CCl₃F
C. CClF₃
D. CCl₄F
Question 677
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 678
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 679
Commonly employed coolant for high pressure turbogenerator is
A. Air
B. Carbon dioxide
C. Hydrogen
D. Water
Question 680
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 681
The lightest non-inflammable gas is
A. H₂
B. He
C. Ar
D. O₂
Question 682
The material used for coating the welding electrode is termed as the
A. Flux
B. Slag
C. Protective layer
D. Binder
Question 683
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 684
Drossing is a __________ operation.
A. Smelting
B. Dressing
C. Roasting
D. Dressing
Question 685
A material expanding freely due to heating will develop __________ stress.
A. No
B. Compressive
C. Tensile
D. Thermal
Question 686
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 687
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 688
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 689
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 690
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 691
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 692
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 693
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 694
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 695
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 696
Heat dissipation in cooling towers is mainly by
A. Conduction
B. Convection
C. Evaporation
D. Radiation
Question 697
The swift cup test evaluates the following property of a sheet metal.
A. Stretchability
B. Drawability
C. Bendability
D. None of these
Question 698
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 699
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 700
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 701
__________ furnace is generally used in the non-ferrous foundaries.
A. Direct arc
B. Indirect arc
C. Resistance
D. Induction
Question 702
__________ rubber is generally used for making 'O' rings used for vacuum sealings.
A. Natural
B. Neoprene
C. Butadiene
D. Nitrile
Question 703
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 704
Cast iron contains __________ percent carbon.
A. 2.5
B. 3.75
C. 4.75
D. 5.25
Question 705
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 706
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 707
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 708
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 709
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 710
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 711
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 712
__________ 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 713
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 714
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 715
Magnesium addition to cast iron increases its
A. Corrosion resistance
B. Creep strength
C. Ductility and strength in tension
D. Hardness
Question 716
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 717
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 718
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 719
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 720
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 721
Thermal equivalent of electrical power in practical calculation is __________ kcal/kWh.
A. 746
B. 3000
C. 1000
D. 550
Question 722
Main alloying element in Elinvar used in precision instruments, hair springs for watches etc. is
A. Chromium
B. Nickel
C. Zinc
D. Aluminium
Question 723
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 724
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 725
For grinding of softer materials, the grinding wheel should have __________ grain size.
A. Finer
B. Coarser
C. Medium
D. Any type of
Question 726
__________ of grey cast iron produces white cast iron.
A. Tempering
B. Rapid heating
C. Rapid cooling
D. Slow cooling
Question 727
Titanium can be easily welded using __________ welding.
A. Submerged arc
B. TIG
C. Shielded metal arc
D. Electroslag
Question 728
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 729
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 730
The most suitable material for die casting is
A. Iron
B. Copper
C. Steel
D. Nickel
Question 731
Lead pencil contains
A. Graphite
B. Lead sulphide
C. Lead
D. Both B & C
Question 732
LVDT used for displacement measurement is a/an __________ transducer.
A. Passive
B. Active
C. Capacitive
D. None of these
Question 733
The refractory lining of the bottom in a basic electric arc furnace is made of
A. Silica
B. Alumina
C. Magnesia
D. Fireclay
Question 734
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 735
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 736
Which of the following is an ore dressing operation?
A. Classification
B. Smelting
C. Roasting
D. None of these
Question 737
__________ strain gauge is the most sensitive sensing element for strain measurement.
A. Photoelastic
B. Semiconductor
C. Wire resistance
D. None of these
Question 738
Maximum consumption of limestone is in the __________ industry.
A. Iron and steel
B. Cement
C. Glass
D. Fertiliser
Question 739
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 740
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 741
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 742
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 743
Hardness & tensile strength of austenitic stainless steel can be increased by
A. Martempering
B. Cold working
C. Normalising
D. Hardening
Question 744
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 745
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 746
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 747
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 748
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 749
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 750
Light year is the unit of
A. Distance
B. Time
C. Intensity of light
D. None of these
Question 751
Minimum number of members required to form a Public Limited Joint Stock Company is
A. 7
B. 10
C. 12
D. 17
Question 752
What is the pH of distilled water?
A. 0
B. 1
C. 7
D. 14
Question 753
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 754
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 755
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 756
Stellite is a __________ material.
A. Ferrous
B. Ceramic
C. Cemented carbide
D. Non ferrous cast alloy cutting tool
Question 757
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 758
Maximum hardenability of steel depends upon its
A. Chemical composition
B. Carbon content
C. Grain size
D. Alloying elements content
Question 759
Filler metal is used in __________ welding.
A. Braze
B. Electric spot
C. Projection
D. Seam
Question 760
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 761
A colloidal system, in which a liquid is dispersed in gas is called a/an
A. Gel
B. Aerosol
C. Foam
D. Emulsion
Question 762
Sewage is not an excellent medium for the growth of
A. Aquatic creatures
B. Protozoa
C. Virus
D. Pathogenic bacteria
Question 763
Disposable patterns are made of
A. Metal
B. Polystyrene
C. Rubber
D. Wood
Question 764
Which of the following is not an ore of zinc?
A. Cerrusite
B. Franklinite
C. Calamine
D. Troosite
Question 765
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 766
Semi-conductors normally employ __________ bonding.
A. Co-ordinate
B. Ionic
C. Covalant
D. Metallic
Question 767
With increase in __________ Knocking tendency in a spark ignition petrol engine decreases.
A. Supercharging
B. Wall temperature
C. Compression ratio
D. Engine speed
Question 768
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 769
If a solid is compressed adiabatically in its elastic range, its __________ remains constat
A. Internal energy
B. Enthalpy
C. Entropy
D. Temperature
Question 770
__________ is used for tying the steel coloumns to concrete foundation.
A. Grouting
B. Eyebolt
C. Anchor bolts
D. Refractory castables
Question 771
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 772
Which of the following has rotten eggy smell?
A. Hydrogen sulphide
B. Styrene
C. Phenol
D. Dimethyl amine
Question 773
With increase in temperature, the electrical conductivity of a __________ decreases.
A. Semi-conductor
B. Metal or alloy
C. Dielectric
D. None of these
Question 774
Which of the following is not an ore of iron?
A. Chalcopyrite
B. Magnetite
C. Hemetite
D. Limonite
Question 775
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 776
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 777
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 778
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 779
Which of the following materials has the least scrap value?
A. Aluminium
B. Stainless steel
C. Brass
D. Copper
Question 780
A material being tested for endurance strength is subjected to the __________ load.
A. Impact
B. Completely reversed
C. Dynamic
D. Static & dynamic
Question 781
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 782
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 783
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 784
Inertial forces are obtained, when the elastic forces are multiplied by __________ number.
A. Mach
B. Froude
C. Reynolds
D. Euler
Question 785
Hot working of lead is carried out at
A. 75°C
B. 373°K
C. 150°C
D. Room temperature
Question 786
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 787
Boiler tube size is specified by its thickness and __________ diameter.
A. Outside
B. Inside
C. Mean
D. None of these
Question 788
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 789
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 790
Which of the following approaches the ideal gas behaviour most closely?
A. Wet steam
B. Saturated steam
C. Superheated steam
D. Saturated water
Question 791
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 792
Fire on fuel oil lines can be extinguished by
A. Foam
B. Steam
C. Water
D. Carbon dioxide
Question 793
__________ property of steel increases by addition of large amount of silicon in it.
A. Mechanical
B. Machining
C. Magnetic
D. Refractory
Question 794
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 795
Laser is a device to produce
A. Gamma rays
B. Microwaves
C. A beam of white light
D. A beam of coherent light
Question 796
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 797
__________ of test specimens is not involved in any hardness testing method.
A. Fracture
B. Indentation
C. Wear
D. Scratch
Question 798
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 799
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 800
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 801
Percentage of argon (by volume) in dry atmospheric air is about
A. 0.09
B. 0.3
C. 0.57
D. 0.94
Question 802
Iron has got __________ isotopes.
A. No
B. Four
C. Three
D. Two
Question 803
Addition of __________ to steel does not help in improving its machinability.
A. Sulphur
B. Silicon
C. Lead
D. Phosphorous
Question 804
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 805
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 806
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 807
__________ 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 808
Eutectoid composition of carbon steel at room temperature is
A. Cementite
B. Pearlite
C. Martensite
D. Ferrite
Question 809
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 810
__________ 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 811
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 812
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 813
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 814
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 815
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 816
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 817
Electrode potential is not concerned with the measurment of
A. PH value
B. Temperature
C. Viscosity
D. Density
Question 818
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 819
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 820
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 821
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 822
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 823
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 824
Large scale fire on fuel gas line is normally extinguished by
A. Water
B. Steam
C. Foam
D. Nitrogen
Question 825
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 826
Annealing of a material does not
A. Permit its further cold working
B. Soften it
C. Case harden it
D. None of these
Question 827
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 828
__________ stress can not be sustained by a fluid in equilibrium.
A. Shear
B. Tensile
C. Compressive
D. None of these
Question 829
Needles are produced by
A. Forging
B. Swaging
C. Extrusion
D. Machining
Question 830
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 831
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 832
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 833
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 834
Which of the following is not a natural abrasive?
A. Silicon carbide
B. Quartz
C. Corundum
D. Emery
Question 835
__________ has the highest melting point out of the following.
A. Tungsten
B. Zirconium
C. Molybdenum
D. Tantalum
Question 836
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 837
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 838
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 839
Heat treatment of steel is done to mainly change its __________ properties.
A. Physical
B. Chemical
C. Mechanical
D. Surface
Question 840
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 841
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 842
Fatigue strength of a metal is improved by
A. Overstressing
B. Scratching the surface
C. Raising the temperature
D. Understressing
Question 843
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 844
A __________ type pressure sensing element is commonly used in aneroid barometer.
A. Capsule
B. Bellow
C. Spiral tube
D. Flat diaphragm
Question 845
No cutting fluid is normally used, while machining
A. Cast iron
B. Aluminium
C. Mild steel
D. Stainless steel
Question 846
Which of the following is not a ferromagnetic material?
A. Nickel
B. Cobalt
C. Aluminium
D. Iron
Question 847
Turning/machining of __________ usually does not require any cutting fluid.
A. Cast iron
B. Stainless steel
C. Mild steel
D. Copper
Question 848
Closeness of packing is maximum in case of __________ crystal lattice.
A. Face centred
B. Simple cubic
C. Body centred
D. None of these
Question 849
Nitrogen compounds are not used in the manufacture of
A. Fertilisers
B. Gun powder
C. Tip of match sticks
D. Explosive
Question 850
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 851
All radiations falling on a black body are
A. Refracted
B. Reflected
C. Transmitted
D. Absorbed
Question 852
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 853
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 854
Neutrons are present in all atoms except that of
A. He
B. C
C. H
D. Ar
Question 855
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 856
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 857
Starting friction is low in case of the __________ lubrication.
A. Boundary
B. Hydrodynamic
C. Hydrostatic
D. Mixed/semi-fluid
Question 858
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 859
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 860
A coal with high __________ content will ignite most easily.
A. Hydrogen
B. Oxygen
C. Volatile matter
D. Fixed carbon
Question 861
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 862
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 863
Coating of zinc over steel is known as
A. Cladding
B. Galvanising
C. Anodising
D. Passivation
Question 864
The moment of inertia of a body comes into play in __________ motion.
A. Curvilinear
B. Linear
C. Rotational
D. None of these
Question 865
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 866
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 867
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 868
Stress and strain are related by __________ elastic constants for a linearly elastic, homogeneous & isotropic material.
A. One
B. Two
C. Three
D. Four
Question 869
Ferromagnetic material owe their properties to __________ inner sub-shells.
A. Completely filled
B. Partially filled
C. Equally filled
D. Vacant
Question 870
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 871
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 872
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 873
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 874
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 875
Cupola produces __________ iron.
A. Pig
B. Cast
C. Wrought
D. Carbon free
Question 876
The radioactive isotope of hydrogen is
A. Deuterium
B. Tritium
C. Protium
D. None of these
Question 877
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 878
In the floatation process, pine oil is used as the
A. Collector
B. Activator
C. Frother
D. Depressant
Question 879
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 880
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 881
Which of the following is not an explosive?
A. TNT
B. CMC
C. RDX
D. Lead azide
Question 882
Calorific value of __________ are almost same.
A. Lignite & anthracite coal
B. Lignite & coal gas
C. Petrol & diesel
D. Coal gas & natural gas
Question 883
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 884
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 885
Which of the following metals is not subjected to electrolytic refinning/purification?
A. Copper
B. Zinc
C. Tin
D. Aluminium
Question 886
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 887
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 888
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 889
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 890
__________ 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 891
Pig iron is a product of
A. Electric arc furnace
B. Cupola
C. Blast furnace
D. Open hearth furnace
Question 892
The most important consideration in value engineering is the
A. Profit maximisation
B. Customer satisfaction
C. Cost reduction
D. Process improvement
Question 893
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 894
Electrometallurgy is not involved in the extraction of __________ from its ore.
A. Aluminium
B. Tin
C. Lead
D. Both B & C
Question 895
Thermodynamic cycle involved in the working of a thermal power plant is the __________ cycle.
A. Joule
B. Carnot
C. Rankine
D. Brayton
Question 896
Which of the following alloying elements reduces the formation of iron sulphide in steel?
A. Cobalt
B. Nickel
C. Manganese
D. Vanadium
Question 897
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 898
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 899
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 900
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 901
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 902
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 903
The joint for soldering is supported by binding wire made of
A. Mild steel
B. Copper
C. Soft iron
D. Stainless steel
Question 904
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 905
Electrochemical corrosion can occur, only if __________ is present in contact with metal.
A. Air
B. Oxygen
C. Liquid medium
D. Gaseous medium
Question 906
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 907
A spring material should have low
A. Elastic limit
B. Deflection value
C. Fatigue resistance
D. None of these
Question 908
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 909
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 910
Which of the following is an unconventional source of energy ?
A. Thermal power
B. Hydroelectric power
C. Nuclear-fusion power
D. Solar power
Question 911
Alloy powder manufactured by the following process have spherical shapes.
A. Electrochemical deposition
B. Gaseous reduction
C. Atomisation
D. Mechanical attrition
Question 912
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 913
Fire refining process is employed in case of
A. Tin
B. Copper
C. Zinc
D. Aluminium
Question 914
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 915
Machine tool bodies are usually made of
A. Cast iron
B. Mild steel
C. Wrought iron
D. Copper alloys
Question 916
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 917
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 918
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 919
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 920
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 921
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 922
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 923
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 924
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 925
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 926
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 927
The co-ordination number in simple cubic structure is
A. 4
B. 6
C. 8
D. 12
Question 928
The single most imortant requirement for a turbine blade material is
A. Damping
B. Resilience
C. Creep resistaned
D. DBTT
Question 929
L.D. (Linz-Donawitz) converter is used in the production of
A. Copper
B. Steel
C. Zinc
D. Aluminium
Question 930
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 931
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 932
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 933
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 934
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 935
__________ wire is never used for making the heating element.
A. Nichrome
B. Kanthal
C. Invar
D. None of these
Question 936
Hoope's cell is predominantly used for the electrolytic refining of
A. Zinc
B. Copper
C. Aluminium
D. Tin
Question 937
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 938
Basic open hearth furnace (BOF) is not used for producing __________ steel.
A. Killed
B. Rimming
C. High alloy
D. None of these
Question 939
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 940
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 941
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 942
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 943
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 944
Usual value of the resistance suitable for a wire resistance strain gauge is __________ ohms.
A. 20
B. 80
C. 120
D. 500
Question 945
__________ is a non volatile film forming constituent of a paint.
A. Thinner
B. Dryer
C. Drying oil
D. None of these
Question 946
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 947
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 948
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 949
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 950
Which of the following alloying elements when added in steel does not improve its lachinability?
A. Sulphur
B. Phosphorous
C. Copper
D. Lead
Question 951
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 952
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 953
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 954
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 955
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 956
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 957
Which of the following rays has the least wavelength?
A. Ultraviolet rays
B. Infrared rays
C. Cosmic rays
D. X-rays
Question 958
Monazite deposits constitute an important source for the following metal.
A. Thorium
B. Titanium
C. Molybdenum
D. None of the above
Question 959
A fire tube boiler is limited to a maximum steam pressure of about __________ kg/cm².
A. 6
B. 18
C. 38
D. 52
Question 960
Phosphorous is added to copper melt to
A. Remove hydrogen
B. Deoxidise the metal
C. Improve fluidity
D. Reduce shrinkage
Question 961
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 962
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 963
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 964
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 965
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 966
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 967
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 968
Which of the following is not an ore of copper?
A. Cryolite
B. Azurite
C. Chalcopyrite
D. Malachite
Question 969
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 970
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 971
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 972
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 973
Colour comparator is used to measure the
A. PH value
B. Electrode potential
C. Colour intensity
D. None of these
Question 974
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 975
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 976
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 977
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 978
Out of the following, the alloy which has equal percentage of constituents, is
A. White metal
B. Gun metal
C. Duralumin
D. Constanton
Question 979
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 980
Pick the odd man out.
A. Austempering
B. Martempering
C. Cyniding
D. Parkerizing
Question 981
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 982
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 983
Babbit lining is used on brass/bronze bearings to increase the
A. Antifriction properties
B. Compressive strength
C. Bearing resistance
D. Wear resistance
Question 984
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 985
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 986
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 987
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 988
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 989
Resilience of a material is important, when it is subjected to
A. Creep
B. Fatigue
C. Shock loading
D. Galvanising
Question 990
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 991
L.D. converters are generally lined with
A. Magnesite
B. Fireclay
C. Chrome magnesite
D. Silica
Question 992
The ability of a substance to assume two or more crystalline structure is called
A. Isomorphism
B. Polymorphism
C. Amorphism
D. Isomerism
Question 993
Machinability of hard alloys & tool steels is improved by
A. Spherodising
B. Annealing
C. Tempering
D. Normalising
Question 994
Gas turbine normally employs a constant __________ cycle.
A. Pressure
B. Temperature
C. Volume
D. None of these
Question 995
The substance used as a smoke screen in warfare is
A. C₂H₂
B. SiCl₄
C. P₂O₅
D. PCl5
Question 996
Old cycle handles are coated with nickel using
A. Cementation
B. Spray coating
C. Galvanising process
D. Tinning process
Question 997
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 998
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 999
A common disinfectant used in village wells for disinfection of water is
A. Free chlorine
B. Bromine
C. Iodine
D. Potassium permanganate
Question 1000
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 1001
Which of the following fastening devices has its both ends threaded?
A. Bolt
B. Stud
C. Set screw
D. Split nut
Question 1002
Out of the following, __________ waves have the largest wavelength.
A. Radio
B. Light
C. X-ray
D. Gamma-ray
Question 1003
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 1004
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 1005
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 1006
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 1007
Cadmium in zinc leach liquor is removed by cementation using
A. Zinc
B. Iron
C. Nickel
D. Copper
Question 1008
Holes for rivetting purposes should be preferably made by
A. Cutting torch
B. Drilling
C. Punching
D. None of these
Question 1009
Exposure to __________ accelarates the degradation of plastics.
A. Ultraviolet radiation
B. High atmospheric temperature
C. High ambient temperature
D. Damp atmosphere
Question 1010
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 1011
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 1012
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 1013
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 1014
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 1015
Most important property of steels for use in automobile bodies is the
A. Formability
B. Yield strength
C. Toughness
D. Resilience
Question 1016
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 1017
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 1018
Projection welding & stud welding is categorised as the __________ welding.
A. Pressure
B. Thermit
C. Resistance
D. Arc
Question 1019
Filler metal is not used in the __________ welding.
A. Seam
B. Electric spot
C. Projection
D. All of the above
Question 1020
Consumable electrodes are used in the __________ welding.
A. Gas
B. Arc
C. Thermit
D. Resistance
Question 1021
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 1022
The same volume of all gases is representative of their
A. Specific gravities
B. Densities
C. Gas characteristic constants
D. Molecular weights
Question 1023
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 1024
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 1025
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 1026
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 1027
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 1028
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 1029
Spark plug is provided in a/an
A. Engine having carburettor
B. Diesel engine
C. Compression ignition engine
D. Both(b) & (c)
Question 1030
Springs are not made of
A. Phospher bronze
B. Nickel steel
C. Monel
D. Carbon steel (c ≤ 0.5%)
Question 1031
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 1032
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 1033
Maximum carbon content in cast iron is __________ percent.
A. 3.8
B. 4
C. 4.3
D. 4.6
Question 1034
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 1035
Which of the following has the highest value of refractive index?
A. Brine (sea water)
B. Diamond
C. Distilled water
D. Glass
Question 1036
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 1037
Brittleness induced due to the presence of sulphur in steel can be reduced by adding
A. Manganese
B. Magnesium
C. Vanadium
D. Copper
Question 1038
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 1039
Surface finish of casting does not depend upon the
A. Sand fineness
B. Pattern finish
C. Mould dressings
D. Metal temperature
Question 1040
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 1041
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 1042
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 1043
In electrical resistance welding, distortion results from the use of improper
A. Clamping methods
B. Electrodes
C. Current
D. Filler material
Question 1044
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 1045
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 1046
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 1047
__________ 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 1048
Which of the following is not a suitable solid lubricant?
A. Talc
B. Molybdenum disulphide
C. Graphite
D. None of these
Question 1049
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 1050
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 1051
Failure of a material is attributed to __________ if it fails below its yield point.
A. Impact loading
B. Fatigue
C. Creep
D. Straining
Question 1052
Increasing sulphur content in pig iron tends to make it
A. Soft
B. Hard
C. Tough
D. Ductile & malleable
Question 1053
Springback in sheet metal bending depends on the
A. Elastic limit
B. Bend radius
C. Degree of bend
D. Thickness of sheet
Question 1054
Number of electrons in the outermost orbit of a semi-conductor is
A. 2
B. 4
C. 6
D. 8
Question 1055
Which of the following is not used as a bearing material?
A. Copper-lead alloys
B. Babbits
C. Bronzes
D. Cermets
Question 1056
Which of the following metals can not be hot worked at room temperature?
A. Zinc
B. Nickel
C. Lead
D. Tin
Question 1057
Improvement in mechanical properties of metals in its hot working is due to the grains
A. Recrystallisation
B. Refinement
C. Growth
D. Recovery
Question 1058
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 1059
__________ 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 1060
Duralumin is an alloy of aluminium and copper. Percentage of copper in duralumin is
A. 38
B. 26
C. 16
D. 4
Question 1061
Stainless steel is welded using
A. Oxy-acetylene flame
B. Oxy-hydrogen flame
C. Arc welding
D. Inert gas arc welding
Question 1062
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 1063
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 1064
Temper brittleness of a material can be fairly detected by the __________ test.
A. Fatigue
B. Notched bar impact
C. Tensile
D. Hardness
Question 1065
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 1066
__________ are not emitted by radioactive substances.
A. Α-rays
B. Β-rays
C. Protons
D. Positrons
Question 1067
Addition of __________ to steel does not impart hardness.
A. Nickel
B. Copper
C. Chromium
D. Silicon
Question 1068
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 1069
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 1070
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 1071
Fatigue strength of a material can not be increased by
A. Cold working
B. Hot working
C. Shot peening
D. Any of these
Question 1072
The ability of tool steel to resist softening at high temperatures is termed as __________ hardness.
A. Red
B. Extended
C. Super
D. Extreme
Question 1073
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 1074
__________ 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 1075
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 1076
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 1077
Cementite is in the lamellar form in the __________ phase of steel.
A. Martensitic
B. Bainitic
C. Pearlitic
D. Ferritic
Question 1078
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 1079
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 1080
Which of the following is a weak acid?
A. HF
B. HCl
C. HI
D. HBr
Question 1081
The 'laughing gas' is
A. Nitrous oxide
B. Nitric oxide
C. Nitrogen trioxide
D. Nitrogen pentoxide
Question 1082
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 1083
Out of the following, __________ pipe is the least corrosion resistant.
A. Mild steel
B. Copper
C. Wrought iron
D. Stainless steel
Question 1084
Out of the following, the most melleable material is
A. Copper
B. Aluminium
C. Wrought iron
D. Lead
Question 1085
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 1086
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 1087
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 1088
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 1089
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 1090
Euler number is defined as the ratio of inertia force to __________ force.
A. Pressure
B. Elastic
C. Gravity
D. Viscous
Question 1091
Existence of velocity potential implies that the fluid is
A. Irrotational
B. Ideal
C. Compressible
D. In continuum
Question 1092
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 1093
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 1094
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 1095
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 1096
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 1097
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 1098
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 1099
The most commonly used moderator in nuclear power plants is
A. Graphite
B. Light water
C. Heavy water
D. Berellium
Question 1100
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 1101
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 1102
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 1103
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 1104
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 1105
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 1106
Non-ferrous alloys used for making cutting tools need not have high
A. Abrasion resistance
B. Toughness
C. Red hardness
D. Cutting speed
Question 1107
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 1108
Magnetic permeability of iron is increased by its
A. Decarburising
B. Alloying with cobalt
C. Purification
D. Alternate heating & cooling
Question 1109
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 1110
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 1111
Material of construction of foundary crucible is
A. Graphite
B. Lead
C. Porcelain
D. Stainless steel
Question 1112
Material of construction of foundary crucible is
A. Lead
B. Stainless steel
C. Graphite
D. Cast iron
Question 1113
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 1114
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 1115
Plastics as a material of construction suffer from the drawback of low
A. Machinability
B. Density
C. Strength
D. Plastic deformation
Question 1116
Which is the only metal that exists in liquid state at room temperature?
A. Sodium
B. Mercury
C. Lithium
D. Strontium
Question 1117
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 1118
Presence of nickel & chromium in steel does not raise its
A. Elastic limit
B. Machining properties
C. Ductility
D. Resilience
Question 1119
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 1120
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 1121
Fluorine is not a constituent of
A. Freon
B. Chloroform
C. Teflon
D. Fluorocarbons
Question 1122
Superheated vapour behaves like
A. Dry steam
B. Gas approximately
C. An ordinary vapor
D. None of these
Question 1123
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 1124
The most serious manufacturing defect from fracture toughness point of view is
A. Surface roughness
B. Pores
C. Spherical inclusion
D. Crack
Question 1125
Unit of surface tension in S.I. unit is
A. Watt/m
B. Joule/m²
C. Newton/m²
D. Joule/m
Question 1126
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 1127
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 1128
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 1129
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 1130
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 1131
"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 1132
The quantity of electricity required to deposit one gm equivalent of any substance is one
A. Ampere
B. Coulomb
C. Microfaraday
D. Faraday
Question 1133
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 1134
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 1135
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 1136
Potable water means the water used for
A. Fire-fighting
B. Cooling
C. Drinking
D. Evaporation to produce steam
Question 1137
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 1138
The phenomenon of weld decay is found in case of
A. Gun metal
B. Brass
C. Stainless steel
D. Cast iron
Question 1139
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 1140
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 1141
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 1142
With increase in annealing temperature, the following defect density decreases.
A. Vacancy
B. Dislocation
C. Grain boundary
D. All of the above
Question 1143
Which of the following has the least oili-ness ?
A. Mineral oils
B. Vegetable oils
C. Greases
D. Animal oils
Question 1144
Which of the following is a permanent fastening?
A. Rivets
B. Bolts
C. Screws
D. Keys
Question 1145
Which of the following is a synthetic abrasive ?
A. Corundum
B. Emery
C. Pumice
D. Silicon carbide
Question 1146
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 1147
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 1148
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 1149
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 1150
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 1151
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 1152
Color of brass changes from yellow to __________ after its dezincification which exemplifies selective leaching.
A. Grey
B. Red
C. Orange
D. Violet
Question 1153
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 1154
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 1155
X-rays are
A. Positively charged
B. Negatively charged
C. Neutral
D. Of higher wavelength than visible light
Question 1156
Minimum thermal efficiency of a steam boiler may be around __________ percent
A. 25
B. 45
C. 65
D. 20
Question 1157
Optical activity is a/an __________ property.
A. Additive
B. Constitutive
C. Both A & B
D. Neither A nor B
Question 1158
The most important requirement for aluminium industry is the availability of cheap
A. Ore
B. Electrical power
C. Labour
D. & abundant water
Question 1159
Shampoos are commercially not available in the form of
A. Powder
B. Gaseous mixture
C. Solution
D. Emulsion
Question 1160
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 1161
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 1162
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 1163
__________ property of a material is determined by the Herbert Pendulum device.
A. Hardness
B. Tensile
C. Toughness
D. Compressive
Question 1164
For preparation of porous bearings by powder metallurgy, preferred particle shape is
A. Spherical
B. Nodular
C. Irregular
D. No preferred shape
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
Enzymes belong to the category of
A. Proteins
B. Carbohydrates
C. Vitamins
D. Fats
Question 1167
Dryness fraction of dry steam is
A. 0
B. ?
C. 1
D. 0.5
Question 1168
At room temperature, F.C.C. crystal structure is observed in
A. Lead
B. Cupro-nickel
C. Titanium
D. Tungsten
Question 1169
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 1170
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 1171
α-rays are
A. Negatively charged
B. Positively charged
C. Neutral
D. Same as X-rays
Question 1172
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 1173
Lubrication is done to control
A. Friction
B. Wear
C. Temperature
D. All of the above
Question 1174
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 1175
Large diameter reinforced cement concrete (RCC) pipes are generally joined by __________ joint.
A. Flanged iron
B. Collar
C. Flexible
D. Expansion
Question 1176
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 1177
Which of the following is not the commercial name of polymethyl-methacrylate (PMMA)?
A. Styrofoam
B. Lucite
C. Perspex
D. Plexiglass
Question 1178
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 1179
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 1180
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 1181
Which of the following materials has the poorest electrical conductivity?
A. Carbon
B. Aluminium
C. Silver
D. Stainless steel
Question 1182
What is the percentage of chromium in 18-4-1 high speed steel?
A. 1
B. 4
C. 18
D. 23
Question 1183
Material having maximum density is
A. Plutonium
B. Osmium
C. Titanium
D. Uranium
Question 1184
Boiling temperature of carbon dioxide at atmospheric pressure is __________ °C.
A. -30.5
B. -78.5
C. -183.5
D. -10.5
Question 1185
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 1186
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 1187
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 1188
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 1189
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 1190
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 1191
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 1192
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 1193
Ferrites are __________ magnetic.
A. Anti
B. Para
C. Ferri
D. Ferro
Question 1194
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 1195
An engineer's hammer is made of high __________ steel.
A. Carbon
B. Speed
C. Silicon
D. Chromium
Question 1196
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 1197
Yield strength of a material is determined by the __________ test.
A. Creep
B. Tension
C. Compression
D. Endurance
Question 1198
Magnesium is present in
A. Haemoglobin
B. Chlorophyll
C. Hypo solution
D. None of these
Question 1199
Work done by a/an __________ process is determined by ∫p.dV.
A. Adiabatic
B. Quasi-static
C. Isothermal
D. Isentropic
Question 1200
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 1201
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 1202
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 1203
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 1204
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 1205
Steel & cast iron pipes are produced by __________ casting.
A. Slush
B. Die
C. Investment
D. True centrifugal
Question 1206
__________ is not used as the control rod material in a nuclear reactor.
A. Cobalt
B. Hafnium
C. Cadmium
D. Boron
Question 1207
Electric arc furnace is employed mainly for the production of __________ steel.
A. High carbon
B. Alloy
C. Mild
D. Plain carbon
Question 1208
Powder metallurgy technique is used in the production of __________ tools.
A. Tungsten carbide
B. High carbon steel
C. High speed steel
D. Drilling
Question 1209
Young's modulus of a material is the measure of its
A. Stiffness
B. Malleability
C. Creep resistance
D. Tensile strength
Question 1210
__________ is the hardest material out of the following.
A. Boron carbide
B. Tungsten carbide
C. Hardened steel
D. Silicon carbide
Question 1211
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 1212
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 1213
Which of the following is not a principal alloying element for the structural steel?
A. Molybednum
B. Nickel
C. Manganese
D. Chromium
Question 1214
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 1215
Spherical shape of mercury droplets is due to its
A. High viscosity
B. Low surface tension
C. High density
D. High surface tension
Question 1216
Which of the following polymers is obtained by copolymerisation of three monomers?
A. SAN
B. ABS
C. SBR
D. PTFE
Question 1217
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 1218
Temperature attained in soldering of metals is about __________ °C.
A. 150-300
B. 400-500
C. 650-800
D. 1000-1100
Question 1219
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 1220
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 1221
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 1222
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 1223
Out of the following surfaces, the emis-sivity will be minimum for
A. Aluminium foil
B. Concrete
C. Plaster
D. Smooth glass
Question 1224
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 1225
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 1226
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 1227
Commonly used flux for brazing is
A. Zinc chloride
B. Borax
C. Ammonium chloride
D. Rosin
Question 1228
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 1229
Air-petrol ratio in an automotive petrol engine is around
A. 14 : 1
B. 22 : 1
C. 25 : 1
D. 4 : 1
Question 1230
A balanced draught boiler furnace employs __________ draught fan.
A. Induced
B. Forced
C. Both A & B
D. Neither A nor B
Question 1231
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