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Materials and Construction MCQ Questions & Answers

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




Question 1

18/8 steel is a/an __________ stainless steel.

A. austenitic
B. ferritic
C. martensitic
D. none of these

View Answer

Question 2

18-4-1 high speed steel contains 18%, 4% and 1% respectively of

A. tungsten, vanadium and chromium
B. tungsten, chromium and vanadium
C. vanadium, chromium and tungsten
D. chromium, tungsten and vanadium

View Answer

Question 3

A suitable material of construction to use with fuming sulphuric acid is

A. carbon steel
B. stainless steel type 304
C. nickel
D. monel

View Answer

Question 4

Acetylene gas holder is made of

A. copper
B. cast iron
C. steel
D. monel metal

View Answer

Question 5

Addition of __________ in steel can help in increasing the depth of hardness.

A. nickel
B. chromium
C. vanadium
D. tungsten

View Answer

Question 6

Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.

A. chromium
B. nickel
C. tungsten
D. cobalt

View Answer

Question 7

Aluminium as a material of construction suffers from the disadvantage of

A. very high cost.
B. rather low tensile strength.
C. very low strength to weight ratio.
D. scarce availability.

View Answer

Question 8

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

A. 1.5-2
B. 3.5-4.5
C. 07-Sep
D. Dec-14

View Answer

Question 9

Babbit metal used for bearings is a____base alloy.

A. tin
B. lead
C. aluminium
D. copper

View Answer

Question 10

Cast iron has very high

A. compressive strength
B. ductility
C. shock resistance
D. resistance to brittleness

View Answer

Question 11

Cast irons are generally specified by their

A. carbon content
B. tensile strength
C. hardness
D. manufacturing proces

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Question 12

Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and

A. moving mercury and graphite.
B. graphite and moving mercury.
C. moving mercury and carbon.
D. moving mercury and crimped steel wire.

View Answer

Question 13

Cementite is

A. Fe3C chemically.
B. a compound of carbon and iron.
C. characterised by an orthorhombic crystal structure.
D. all (a), (b) and (c).

View Answer

Question 14

Ceramic recuperators are generally made of

A. silicon carbide.
B. calcium carbide.
C. fireclay bricks.
D. high alumina bricks.

View Answer

Question 15

Cermets are __________ materials.

A. refractory
B. reinforced
C. abrasive
D. fully metallic

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Question 16

Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with

A. karbate
B. lead or glass
C. fireclay bricks
D. PVC

View Answer

Question 17

Coke oven regenerators are made of __________ bricks.

A. fire clay
B. silica
C. low thermal conductivity
D. high electrical conductivity

View Answer

Question 18

Constantan is an alloy of

A. Cu (55%) & Sn (45%).
B. Cu (55%) & Ni (45%).
C. Pt (95%) & Rh (10%).
D. Fe (80%) & Ni (20%).

View Answer

Question 19

Constituents of stellite are

A. zinc, copper and nickel.
B. cobalt, chromium and tungsten.
C. zinc, aluminium and nickel.
D. nickel, cobalt and vanadium.

View Answer

Question 20

Dielectric strength of a material is

A. its energy stroage capacity.
B. a magnetic property.
C. its capacity to resist the flow of current.
D. its capacity to withstand high voltage.

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Question 21

Galvanised iron is

A. harder
B. protected from rusting
C. alumina coated iron
D. none of these

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Question 22

German silver in an alloy of

A. copper, nickel and zinc.
B. copper, aluminium and silver.
C. silver, zinc and aluminium.
D. silver, nickel and zinc.

View Answer

Question 23

German silver used for decorative purposes contains maximum percentage of

A. silver
B. copper
C. zinc
D. nickel

View Answer

Question 24

Hammers and railway rails are normally made of

A. mild steel
B. dead mild steel
C. medium carbon steel
D. high carbon steel

View Answer

Question 25

Heavy duty bearings are usually made of

A. white metal
B. phosphorous bronze
C. monel
D. zinc

View Answer

Question 26

Invar used in thermocouples is an alloy of nickel and

A. iron
B. copper
C. chromium
D. lead

View Answer

Question 27

Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by

A. dilute HCI
B. acetic acid
C. concentrated H2SO4
D. none of these

View Answer

Question 28

Liquid ammonia is shipped in __________ containers.

A. steel
B. aluminium
C. glass
D. lead lined

View Answer

Question 29

Nickel (56%) and molybdenum (17%) alloys are called

A. monel
B. hastealloy C
C. inconel
D. bronzes

View Answer

Question 30

Percentage elongation of a material is a measure of its

A. ductility
B. brittleness
C. toughness
D. malleability

View Answer

Question 31

Presence of nickel in steel improves its

A. corrosion resistance.
B. cutting ability.
C. wear resistance.
D. all (a), (b) and (c).

View Answer

Question 32

Refined acetic acid storage vessel are made of

A. copper
B. aluminium
C. high carbon steel
D. nickel

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Question 33

Residual magnetism in steel for magnets is increased by the addition of

A. nickel
B. cobalt
C. tungsten
D. chromium

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Question 34

Shock resisting steels should possess high

A. hardness
B. toughness
C. tensile strength
D. wear resistance

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Question 35

Softness of silver can be converted into hardness by alloying it with small quantity of

A. copper & nickel
B. zinc
C. aluminium
D. tin

View Answer

Question 36

Sulphur melting pit in the sulphuric acid plant is made of

A. lead lined stainless steel.
B. cast iron.
C. steel or cement-brick lined.
D. hard wood.

View Answer

Question 37

The addition of antimony in tin-based alloys improves its

A. rupture strength and hot hardness.
B. impact strength and bonding strength.
C. deformation resistance.
D. wear resistance.

View Answer

Question 38

The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.

A. non-crystalline solid
B. crystalline
C. rubberry
D. non-crystalline organic polymeric.

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Question 39

The hardest material just prior to diamond in Mho's scale is

A. topax
B. carborundum
C. corrundum
D. calcite

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Question 40

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.

A. 0.2
B. 2
C. 4
D. 8

View Answer

Question 41

The main purpose of galvanising iron sheets is to

A. harden the surface.
B. increase its glossiness and lustre.
C. prevent the action of water.
D. prevent the action of oxygen.

View Answer

Question 42

The melleability 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 miximum malleability ?

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

View Answer

Question 43

The metals occuring at the lower most position in the electromotive series

A. do not resist corrosion.
B. resist corrosion very strongly.
C. are very brittle.
D. are heat insulators.

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Question 44

The purpose of nitriding the steel is to

A. harden its surface.
B. soften its surface.
C. improve its reliability.
D. none of these.

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Question 45

Which of the following crystal structures characterises the austenitic stainless steel?

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

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Question 46

Which of the following has the highest compressive strength ?

A. Wrought iron
B. Cast iron
C. Mild steel
D. High carbon steel

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Question 47

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals) ?

A. Invar
B. Constantan
C. Chromel
D. Alumel

View Answer

Question 48

Which of the following stainless steels is non-magnetic ?

A. Ferritic
B. Martensitic
C. Austenitic
D. None of these

View Answer

Question 49

White cast iron is not

A. malleable
B. whitish in color
C. brittle
D. strong and hard

View Answer

Question 50

Zinc is not used

A. for producing zinc base die casting alloys.
B. in its oxide form as pigments.
C. as anode for corrosion prevention in boiler.
D. as an alloying element in various bronzes.

View Answer

Question 51

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals)?

A. Invar
B. Constantan
C. Chromel
D. Alumel

View Answer

Question 52

In drop forging process, the forging is done by dropping the __________ at high velocity.

A. Hammer
B. Workpiece
C. Die with hammer
D. Weight on hammer

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Question 53

Most of the common metals have __________ crystal structure.

A. Cubic
B. Hexagonal
C. Orthorhombic
D. None of these

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Question 54

Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is

A. Used for making axle & shafts of aeroplanes, automobiles and locomotives
B. Having poor fatigue resistance
C. Having poor toughness
D. Not helpful in producing cleaner steel due to oxidising action of vanadium

View Answer

Question 55

Liners of a ball mill are never made of

A. Lead
B. Alloy steel
C. Rubber or ceramic material
D. Cast iron

View Answer

Question 56

Approximate value of the modulus of elasticity for steel is about __________ x l0⁶kg/cm².

A. 0.5
B. 2
C. 40
D. 75

View Answer

Question 57

Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?

A. Silicon
B. Phosphorus
C. Sulphur
D. None of these

View Answer

Question 58

An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called

A. Constantan
B. Kanthal
C. Chromel
D. German silver

View Answer

Question 59

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

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

View Answer

Question 60

Rubber lined vessels are corroded by the action of

A. Aqua regia
B. Chloroform
C. Sulphuric acid (95%)
D. All of the above

View Answer

Question 61

Pipes for bi-cycle frames are made of __________ steel.

A. Hot rolled
B. Chrome carbon
C. Cold rolled
D. Stainless

View Answer

Question 62

Nickel and copper are the basic constituents of

A. Hastelloy
B. Monel metal
C. German silver
D. Inconel

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Question 63

Nickel and molybdenum are the basic constituents of

A. Hastealloy
B. German silver
C. Inconel
D. Solder

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Question 64

Nickel as a material of construction

A. Is used as an alloying element for both ferrous & non-ferrous alloys
B. Is paramagnetic below 415° C (its Curie temperature)
C. Dimagnetic
D. Has a body centred cubic (bcc) crystal lattice structure

View Answer

Question 65

The increase in hardness of metal due to its cold working is termed as the __________ hardening.

A. Work
B. Age
C. Induction
D. Flame

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Question 66

Balls in a ball mill are usually made of

A. Steel
B. Cast iron
C. Stainless steel
D. Bronze

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Question 67

Concentrated HCl at 30°C can be stored in a vessel made of

A. PTFE and porcelain
B. Cast iron and aluminium
C. Stainless steel and high silicon cast iron
D. None of these

View Answer

Question 68

Brine (15% concentration) can be stored in a vessel made of

A. Monel
B. Karbate
C. Cast iron
D. None of these

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Question 69

A bearing metal should not have

A. Enough plasticity
B. Low thermal conductivity
C. Low co-efficient of friction
D. High toughness

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Question 70

White cast iron as compared to grey cast iron is

A. More durable
B. Very brittle
C. Very hard
D. All of the above

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Question 71

Which of the following is produced by condensation polymerisation?

A. Bakelite
B. Polythene
C. Poly vinyl chloride
D. Polystyrene

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Question 72

Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.

A. Bismuth
B. Arsenic
C. Antimony
D. Both B and C

View Answer

Question 73

Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.

A. Copper
B. Copper alloys
C. Stainless steel
D. Monel

View Answer

Question 74

Dies for wire drawing are generally made of

A. Mild steel
B. Stainless steel
C. Carbides
D. High carbon steel

View Answer

Question 75

High resistance electrical heating elements/wire are not made of

A. Marageing steel
B. Nimonic alloys
C. Kanthal wire
D. Nichrome

View Answer

Question 76

The material used in the filament of electric bulbs is

A. Nichrome
B. Tungsten
C. Constantan
D. German silver

View Answer

Question 77

The main purpose of galvanising iron sheets is to

A. Harden the surface
B. Increase its glossiness and lustre
C. Prevent the action of water
D. Prevent the action of oxygen

View Answer

Question 78

Which of the following metals in not used for coating of the base metal to guard it against corrosion?

A. Lead
B. Cadmium
C. Magnesium
D. Aluminium

View Answer

Question 79

__________ is a donor impurity for semi-conductors.

A. Boron
B. Antimony
C. Gallium
D. None of these

View Answer

Question 80

Hydrochloric acid is stored in a __________ steel vessel.

A. Lead lined
B. Rubber lined
C. Glass lined
D. Stainless

View Answer

Question 81

Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of

A. Wood
B. Stainless steel
C. Reinforced concrete lined with lead
D. High silicon iron (14% Si)

View Answer

Question 82

Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.

A. 0.02
B. 0.2
C. 0.35
D. 0.5

View Answer

Question 83

Alpha iron is stable __________ °C.

A. Above 1403
B. Upto 910
C. Above 1800
D. Between 910 & 1403

View Answer

Question 84

__________ iron is produced, when molten pig iron is allowed to cool gradually.

A. White cast
B. Grey cast
C. Wrought
D. None of these

View Answer

Question 85

Which of the following is not a nickel based alloy?

A. Inconel
B. Hastelloys
C. Nimonics
D. Babbit metal

View Answer

Question 86

Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.

A. Oxygen
B. Arsenic
C. Antimony
D. Bismuth

View Answer

Question 87

Maximum consumption of lead is in the manufacture of

A. Storage batteries
B. Solder alloys
C. Electric cable sheathing
D. Lead lined vessels

View Answer

Question 88

Coke oven walls are lined with __________ bricks.

A. Silica
B. Tar-dolomite
C. Low thermal conductivity
D. Fire clay

View Answer

Question 89

Babbit metal (used for making bearings) comprises of

A. Mainly tin (85%) and lead
B. Saw dust and iron dust mixture
C. Zinc and aluminium
D. Copper and aluminium

View Answer

Question 90

The chlorinator used in the manufacture of DDT is made of

A. Glass
B. Glass lined steel
C. Teflon
D. Bakelite

View Answer

Question 91

Carbon percentage in medium carbon steel is around

A. 0.1 to 0.35
B. 0.35 to 0.5
C. 0.8 to 1.4
D. 1 to 1. 5

View Answer

Question 92

Addition of nickel to copper improves its

A. Machinability
B. Ductility
C. Strength
D. Hardness

View Answer

Question 93

__________ is not a case hardening process.

A. Carburising
B. Nitriding
C. Cyaniding
D. Annealing

View Answer

Question 94

Gunmetal and bronze are not corroded by the action of

A. Wet chlorine
B. Synthetic detergent solution
C. Hydrochloric acid (10%)
D. Nitric acid (< 25%)

View Answer

Question 95

Glass lined vessels are not used for handling/storing

A. Dilute H₂SO₄
B. Dilute HNO₃
C. Dilute HCl
D. Hydroflouric acid

View Answer

Question 96

Pick the odd man out of the following.

A. Calorising
B. Pack carburising
C. Nitriding
D. Cyaniding

View Answer

Question 97

For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is

A. Stainless steel
B. Cast iron
C. Aluminium
D. Nickel

View Answer

Question 98

Percentage of silver in German silver is

A. 5
B. 10
C. 20
D. 0

View Answer

Question 99

Sulphuric acid pickling tanks are lined with

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

View Answer

Question 100

__________ iron is produced, when molten pig iron is chilled suddenly.

A. White cast
B. Grey cast
C. Wrought
D. None of these

View Answer

Question 101

Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by

A. Dilute HCI
B. Acetic acid
C. Concentrated H₂SO₄
D. None of these

View Answer

Question 102

Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)₂. Lead pipes are readily corroded by

A. Dilute HC₁
B. Acetic acid
C. v
D. None of these

View Answer

Question 103

To improve the machinability of steel by its softening, it is subjected to

A. Cold working
B. Annealing
C. Shot blasting
D. Heating

View Answer

Question 104

Which of the following is the most widely used insulating material for steam carray-ing pipelines?

A. Ceramic fibre blanket
B. Glass wool and 85% magnesia
C. Vermiculite
D. Slag wool

View Answer

Question 105

18/8 stainless steel means, that it contains

A. 18% chromium and 8% nickel
B. 18% chromium and 8% molybdenum
C. 18% nickel and 8% chromium
D. 18% molybdenum and 8% chromium

View Answer

Question 106

Lead alone is not used in storing equipment, because it

A. Is very costly
B. Corrodes easily
C. Is having low creep strength
D. None of these

View Answer

Question 107

Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of

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

View Answer

Question 108

High speed steel tools retain their hardness upto a temperature of __________ °C.

A. 500
B. 750
C. 900
D. 1100

View Answer

Question 109

The material of construction of pressure mills used for squeezing out the juice from sugar cane is

A. Stainless steel
B. Cast iron
C. Mild steel
D. Monel

View Answer

Question 110

Which of the following has the least carbon percentage?

A. Low carbon steel
B. Mild steel
C. Wrought iron
D. White cast iron

View Answer

Question 111

The addition of antimony in tin-based alloys improves its

A. Rupture strength and hot hardness
B. Impact strength and bonding strength
C. Deformation resistance
D. Wear resistance

View Answer

Question 112

The heat treatment process applied to cold formed steel parts is

A. Normalising
B. Tempering
C. Artificial ageing
D. Solution annealing

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Question 113

The softest material just next to talc in the Mho's scale is

A. Quartz
B. Gypsum
C. Feldspar
D. Fluorite

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Question 114

__________ can replace tungsten in high speed steel,

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

View Answer

Question 115

Which of the following undergoes granular fracture?

A. Wrought iron
B. Steel
C. Cast iron
D. None of these

View Answer

Question 116

Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?

A. Silicon steel
B. Chromium steel
C. Molybdenum steel
D. None of these

View Answer

Question 117

Steel tower used for the storage of oleum

A. Is lined with lead
B. Need not be lined
C. Is lined with rubber
D. Is lined with acid-proof bricks

View Answer

Question 118

Iron alloyed with carbon upto 2% is called

A. Pig iron
B. Wrought iron
C. High carbon steel
D. None of these

View Answer

Question 119

Gas holder of a gobar (cowdung) gas plant is made of

A. Molybdenum stainless steel
B. Tin
C. Mild steel
D. Aluminium

View Answer

Question 120

Common house hold glass (i.e., soda-lime glass) is a/an __________ material.

A. Fully crystalline
B. Partly crystalline
C. Amorphous
D. None of these

View Answer

Question 121

In SO₃ absorber (Contact Process), packing material used is of

A. Cast iron
B. Chemical stoneware
C. Karbate
D. Mild steel

View Answer

Question 122

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

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

View Answer

Question 123

In hot wire aneomometer used for gas flow measurement, the wire is normally made of

A. Copper
B. Platinum
C. Constantan
D. Chromium

View Answer

Question 124

A magnetic material becomes __________ above the Curie temperature.

A. Ferromagnetic
B. Diamagnetic
C. Paramagnetic
D. None of these

View Answer

Question 125

Hydrochloric acid is __________ corrosive to common metals.

A. Least
B. Not
C. Mildly
D. Highly

View Answer

Question 126

Nickel base alloys with __________ are known as monel metal.

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

View Answer

Question 127

The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement.

A. Brass for low
B. Nickel alloys for high
C. Both A & B
D. Aluminium for all

View Answer

Question 128

A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.

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

View Answer

Question 129

The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.

A. Precipitation
B. Fusion
C. Sintering
D. Agglomeration

View Answer

Question 130

Zinc is highly __________ at room temperature.

A. Ductile
B. Resistant to atmospheric corrosion
C. Malleable
D. Brittle

View Answer

Question 131

Brine solution is stored/treated in __________ lined vessels/pipes.

A. Rubber
B. Lead
C. Glass
D. Nickel

View Answer

Question 132

High speed cutting tool steels contain about __________ percent of tungsten.

A. 6-8
B. 18-20
C. 30-35
D. 50-55

View Answer

Question 133

Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel

A. Rubber
B. Monel
C. Glass
D. Nickel

View Answer

Question 134

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.

A. 1.5-2
B. 3.5-4.5
C. 7-9
D. 12-14

View Answer

Question 135

SO₃ is absorbed using H₂SO₄ in a

A. Cast iron packed tower
B. Stainless steel plate tower
C. Packed steel tower lined with acid proof bricks
D. None of these

View Answer

Question 136

How many molecules per unit cell are there in a face centred cubic lettice?

A. 2
B. 4
C. 6
D. 8

View Answer

Question 137

Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the

A. Ultimate tensile strength (U.T.S.)
B. Endurance limit
C. Elastic limit
D. None of these

View Answer

Question 138

Acid proof stoneware

A. Has very low strength
B. Cannot be heated
C. Is broken by small temperature changes
D. All of the above

View Answer

Question 139

Steel pipes are normally manufactured by __________ process.

A. Extrusion
B. Cold working
C. Forging
D. Electroforming

View Answer

Question 140

Invar contains the highest percentage of

A. Vanadium
B. Iron
C. Tungsten
D. Cobalt

View Answer

Question 141

The most distinguished property of malleable cast iron is its high

A. Ductility
B. Hardness
C. Malleability
D. None of these

View Answer

Question 142

Which of the following is not an alloy of nickel and chromium?

A. Inconel
B. Hastealloy
C. Nimonic alloys
D. Duralumin

View Answer

Question 143

Ball bearings are normally made of __________ steel.

A. High speed
B. High carbon
C. Chrome
D. Silicon

View Answer

Question 144

Steel balls for ball bearings are generally made of __________ steel.

A. Cast
B. Stainless
C. Free carbon
D. Carbon chrome

View Answer

Question 145

Clock pendulums are usually made of __________ steel.

A. High speed
B. Stainless
C. Heat resisting
D. None of these

View Answer

Question 146

Presence of high amount of silicon in cast iron

A. Suppresses the decomposition of Fe₃ C
B. Increases the formation of graphite
C. Increases the contraction of the metal
D. Reduces its fluidity

View Answer

Question 147

German silver is an alloy of copper, nickel and

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

View Answer

Question 148

Which of the following has the highest density and the lowest melting point?

A. Stainless steel
B. Titanium
C. Lead
D. Aluminium

View Answer

Question 149

Valves in pipe size of 2" and under are normally made of

A. Wrought iron
B. Brass
C. Bronze
D. Monel

View Answer

Question 150

Wrought iron is a suitable material of construction for handling __________ solutions.

A. Dilute acidic
B. Concentrated acidic
C. Alkalis & alkaline
D. None of these

View Answer

Question 151

The preferred material of construction for storage tanks for 98% sulphuric acid is

A. Aluminium
B. Lead
C. Stainless steel 316
D. Mild steel

View Answer

Question 152

Dilute sulphuric acid is transported in __________ pipes.

A. Mild steel
B. Lead
C. Copper
D. Special alloys

View Answer

Question 153

Silicone rubber is not resistant to the corrosive action of

A. Sulphuric acid (10%)
B. Sulphuric acid (95%)
C. Ether
D. Both B and C

View Answer

Question 154

With increase in carbide/graphite ratio in cast iron, its

A. Hardness & brittleness increases
B. Ductility decreases
C. Both A & B
D. Neither A nor B

View Answer

Question 155

Locomotive boiler tubes are made of __________ alloys.

A. Arsenic copper
B. Magnesium
C. Aluminium
D. Nickel

View Answer

Question 156

Beehive coke ovens are made of __________ bricks.

A. Silica
B. Fireclay
C. Silicon carbide
D. Corundum

View Answer

Question 157

Cold worked steel parts are normally subjected to

A. Normalising
B. Hardening
C. Annealing
D. Shot peening

View Answer

Question 158

In cold working of metal as compared to its hot working

A. Cracks and blow holes are eliminated
B. Ductility and impact strength improves
C. Appreciable strain hardening is produced
D. Yield stress, hardness and fatigue strength is not at all affected

View Answer

Question 159

The melleability 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 miximum malleability?

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

View Answer

Question 160

The electrical conductivity of a __________ decreases with rise in temperature.

A. Metal/alloy
B. Semi-conductor
C. Dielectric
D. None of these

View Answer

Question 161

Tin coating on metals is not done by

A. Spraying
B. Powder metallurgy
C. Hot dipping
D. Electro-deposition

View Answer

Question 162

An ideal material of construction for the storage of 50% caustic soda solution would be

A. Karbate
B. High silicon cast iron
C. Monel
D. None of these

View Answer

Question 163

Babbit metal is not a

A. Tin base alloy
B. White metal
C. Lead base alloy
D. Pure metal

View Answer

Question 164

Dry chlorine can be handled in a vessel made of

A. Iron or steel
B. PVC
C. Ickel
D. Brass

View Answer

Question 165

Caustic soda can be stored in __________ drums.

A. Steel
B. Cast iron
C. Brass
D. Gun metal

View Answer

Question 166

Vessels made of __________ can be used to store dry chlorine.

A. Thermoplastic materials
B. Nickel
C. Steel or iron
D. None of these

View Answer

Question 167

Ball bearings are generally made of

A. Plain carbon steel
B. Chrome carbon steel
C. Stainless steel
D. Malleable cast iron

View Answer

Question 168

Bell metal is an alloy of

A. Copper & zinc
B. Copper & tin
C. Copper & nickel
D. Zinc & tin

View Answer

Question 169

Brass is an alloy of

A. Nickel and tin
B. Copper and zinc
C. Tin and lead
D. Copper, nickel and zinc

View Answer

Question 170

Bush bearings are made of

A. Mild steel
B. Phosphorous bronze
C. White metal alloys
D. None of these

View Answer

Question 171

Hydrochloric acid is stored in a__vessel.

A. Lead lined steel
B. Rubber lined steel
C. Stainless steel
D. Cast iron

View Answer

Question 172

A material is called 'ductile', if it can be

A. Drawn into wires
B. Hammered to a thin sheet
C. Fractured without deformation
D. Made lustrous by heating it

View Answer

Question 173

The maximum percentage of chromium that can be added to steel is about

A. 12
B. 18
C. 24
D. 30

View Answer

Question 174

Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making

A. Nuts
B. Bolts
C. Chiesels
D. Studs

View Answer

Question 175

Cast iron has

A. Very high tensile strenth
B. High ductility
C. High malleability
D. Elastic limit close to ultimate breaking strength

View Answer

Question 176

Cast iron is

A. Used for making shock resisting parts
B. Manufactured in cupola and is brittle
C. Having compressive strength more than its tensile strength
D. All of the above

View Answer

Question 177

Cast iron is having very high

A. Proximity between its elastic limit and ultimate breaking strength
B. Ductility
C. Tensile strength
D. All of the above

View Answer

Question 178

Ability of a material to __________ is indicated by its damping capacity.

A. Withstand compression
B. Absorb vibration
C. Absorb shock
D. None of these

View Answer

Question 179

Mixing vessel used for the chlorination of methane to produce methyl chloride is made of

A. Copper
B. Cast iron
C. Aluminium
D. High carbon steel

View Answer

Question 180

Cementite is

A. Fe₃C chemically
B. A compound of carbon and iron
C. Characterised by an orthorhombic crystal structure
D. All of the above

View Answer

Question 181

Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making

A. Shafts
B. Flanges
C. Gears
D. Shear blades

View Answer

Question 182

How many atoms are there per unit cell in a body centred cubic lattice system?

A. 2
B. 3
C. 4
D. 6

View Answer

Question 183

Ceramic materials

A. Are exemplified by clay and mica
B. Are poor electrical conductors due to lack of free electrons
C. Never exhibit polymorphism
D. All of the above

View Answer

Question 184

Ceramic materials are

A. Organic in nature
B. Stronger in compression than in tension
C. Always amorphous in nature
D. Always bad heat conductors

View Answer

Question 185

Cermets are used for making

A. Cutting tools
B. Abrasives
C. Both A & B
D. Neither A nor B

View Answer

Question 186

Interchain forces are the weakest in case of

A. Plastics
B. Fibres
C. Elastomers
D. Both rubber & elastomers

View Answer

Question 187

Low carbon steels are those in which carbon percentage is around

A. 0.1 to 0.35
B. 0.4 to 0.7
C. 0.8 to 1.5
D. 1.5 to 2

View Answer

Question 188

Chilled iron castings are

A. Easily machinable
B. Soft on surface
C. Highly wear resistant
D. None of these

View Answer

Question 189

Nickel is a __________ material.

A. Ferromagnetic
B. Diamagnetic
C. Paramagnetic
D. None of these

View Answer

Question 190

Alinco, which is a aluminium-cobalt-nickel steel, is used for making

A. Surgical instruments
B. Powerful magnets
C. Chemical equipments
D. Boiler tubes

View Answer

Question 191

Biological shield in a nuclear power reactor is made of

A. Concrete
B. Steel
C. Cadmium
D. Zircalloy

View Answer

Question 192

The fermentor used for the production of ethyl alcohol from molasses is made of

A. Wood
B. Concrete
C. Copper bearing steel
D. Procelain

View Answer

Question 193

The heat treatment process to which castings and the steel balls produced by cold heading are subjected is

A. Tempering
B. Normalising
C. Annealing
D. None of these

View Answer

Question 194

The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.

A. Non-crystalline solid
B. Crystalline
C. Rubberry
D. Non-crystalline organic polymeric

View Answer

Question 195

Cast iron compared to steel is better in

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

View Answer

Question 196

H₂SO₄ (< 50% concentration) is corrosive to

A. Aluminium, mild steel, stainless steel, concrete & tin
B. Copper, cast iron & high silicon iron (14% Si)
C. Rubber (butyl and hard), silicone rubber & teflon
D. Glass, graphite, porcelain & stoneware

View Answer

Question 197

Constantan is an alloy of

A. Cu (55%) & Sn (45%)
B. Cu (55%) & Ni (45%)
C. Pt (95%) & Rh (10%)
D. Fe (80%) & Ni (20%)

View Answer

Question 198

Constituents of stellite are

A. Zinc, copper and nickel
B. Cobalt, chromium and tungsten
C. Zinc, aluminium and nickel
D. Nickel, cobalt and vanadium

View Answer

Question 199

Polythene (low or high density) containers are not corroded by

A. Sulphuric acid (10%) at room temperature
B. Nitric acid (95%) at room temperature
C. Sulphur trioxide at 60°C
D. Any of these

View Answer

Question 200

An alloy of iron containing 4% carbon is called

A. High carbon steel
B. Wrought iron
C. Mild steel
D. None of these

View Answer

Question 201

__________ does not contain copper as an alloying element,

A. Nichrome
B. Manganin
C. Perminivar
D. Monel metal

View Answer

Question 202

Copper has very low

A. Malleability
B. Ductility
C. Tensile strength
D. Thermal & electrical conductivity

View Answer

Question 203

Bearings subjected to light load are made of

A. White metal
B. Phosphorous bronze
C. Monel
D. Silicon bronze

View Answer

Question 204

Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and

A. Moving mercury and graphite
B. Graphite and moving mercury
C. Moving mercury and carbon
D. Moving mercury and crimped steel wire

View Answer

Question 205

In the kraft (sulphate) process for the paper manufacture, the digestor is made of

A. Cast iron
B. Stainless steel
C. Karbate carbon
D. Wrought iron

View Answer

Question 206

Which of the following is produced by addition polymerisation?

A. Polybutadiene
B. Phenol formaldehyde
C. Urea-formaldehyde
D. Dacron

View Answer

Question 207

Ammonium chloride solution is stored/ treated in __________ vessels/pipes.

A. Plain carbon steel
B. Stainless steel
C. Rubber or durmet-20 lined
D. Lead

View Answer

Question 208

Wood metal is not used for making

A. Soft solder
B. Casting for dental work
C. Storage tank for storing brine and caustic soda
D. Fusible safety plug for pressure cooker

View Answer

Question 209

Evaporators used in caustic soda recovery and production plant are made of

A. Monel metal
B. Gun metal
C. Wood metal
D. Babbit metal

View Answer

Question 210

Silicon percentage in acid resistant cast iron is about

A. 4
B. 8
C. 14
D. 20

View Answer

Question 211

The temperature at which new grains are formed in the metal is called the __________ temperature.

A. Eutectic
B. Recrystallisation
C. Upper critical
D. Lower critical

View Answer

Question 212

A material capable of undergoing large permanent deformation, when subjected to compression is termed as

A. Malleable
B. Ductile
C. Brittle
D. None of these

View Answer

Question 213

Plasticisers are added to polymers to improve their

A. Tensile strength
B. Softness & flexibility
C. Acid resistance
D. Alkali resistance

View Answer

Question 214

DDT is shipped in

A. Stainless steel containers
B. Paper bags
C. Fibre drums
D. Either B or C

View Answer

Question 215

Age hardening' of duralumin is due to

A. Copper
B. Magnesium
C. Both A & B
D. Neither A nor B

View Answer

Question 216

The ability of a material to offer resistance to scratching or indentation is a measure of its

A. Brittleness
B. Toughness
C. Hardness
D. Resilience

View Answer

Question 217

Cast iron has

A. High ductility
B. High malleability
C. Very high tensile strength
D. Its elastic limit very close to ultimate breaking strength

View Answer

Question 218

Hardest materials so far found is

A. Diamond
B. Graphite
C. Carborundum
D. Pumice stone

View Answer

Question 219

Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of

A. Cast iron
B. Stainless steel or glass lined vessel
C. Karbate
D. Wrought iron

View Answer

Question 220

Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of

A. Stainless steel or glass lined steel
B. Nickel clad steel
C. High silicon cast iron
D. Aluminium

View Answer

Question 221

Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as

A. Sheradising
B. Parkerising
C. Anodising
D. None of these

View Answer

Question 222

Nitriding of steel is a process for

A. Case hardening
B. Spheroidising
C. Normalising
D. Annealing

View Answer

Question 223

The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called

A. Bauschinger effect
B. Hooke's effect
C. Hysterisis
D. Relaxation

View Answer

Question 224

Duralumin is an alloy of

A. Aluminium, copper and manganese
B. Aluminium, nickel and silicon
C. Aluminium and nickel
D. None of these

View Answer

Question 225

Duriron is

A. Acid resistant, brittle and very hard
B. High silicon iron
C. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
D. All of the above

View Answer

Question 226

Which of the following is a light alloy?

A. Monel metal
B. Dow metal
C. German silver
D. Babbit metal

View Answer

Question 227

Which of the following has no effect on the carbide forming tendency in steels?

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

View Answer

Question 228

Which of the following has a very high carbide forming tendency in steels?

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

View Answer

Question 229

In order to be called steel, an alloy should have iron percentage greater than

A. 80
B. 70
C. 90
D. 50

View Answer

Question 230

Carbon percentage is the same in cast iron and

A. Wrought iron
B. Pig iron
C. Mild steel
D. High silicon (14%) iron

View Answer

Question 231

Which one contains the least percentage of carbon?

A. Wrought iron
B. High speed steel
C. Cast iron
D. Pig iron

View Answer

Question 232

Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.

A. Beryllium
B. Manganese
C. Copper
D. Iron

View Answer

Question 233

The purpose of nitriding the steel is to

A. Harden its surface
B. Soften its surface
C. Improve its reliability
D. None of these

View Answer

Question 234

Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of

A. Rubber lined mild steel
B. Lead lined mild steel
C. Aluminium
D. Cast iron

View Answer

Question 235

Pick out the wrong statement

A. Hardening makes the steel more brittle
B. High alloy steels contain more than 50% alloying element
C. 18/8 stainless steel is a magnetic steel
D. Both B and C

View Answer

Question 236

A material capable of undergoing large permanent deformation, when subjected to tension is termed as

A. Friable
B. Ductile
C. Brittle
D. None of these

View Answer

Question 237

Which one occupies the lowermost position in the electromotive series of metals?

A. Aluminium
B. Noble metals (Ag, Pt, Au)
C. Zinc
D. Alkali metals (K, Na, Li)

View Answer

Question 238

Carbon is present in the uncombined (graphitic) form in case of

A. Cast iron
B. Steel
C. Ferroalloy
D. None of these

View Answer

Question 239

__________ moulding process can not be used for thermoplastic plastics.

A. Compression
B. Extrusion
C. Injection
D. None of these

View Answer

Question 240

Carbon tetrachloride can be stored in a storage vessel made of

A. High silicon iron (14% Si)
B. Tin
C. Stainless steel
D. All of the above

View Answer

Question 241

100% H₂SO₄ at 30°C can't be stored in a vessel made/lined with

A. Cast iron and high silicon iron
B. Mild steel and stainless steel
C. Aluminium, tin and rubber
D. Teflon, glass and porcelain

View Answer

Question 242

Mercury is transported in metal containers made of

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

View Answer

Question 243

Straight silicon steel (containing Si from 0.5 to 5%) because of their low hysterisis loss and high magnetic permeability are used for electrical appliances. Which of the following electrical appliances made of silicon steel contains maximum percentage of silicon (about 4%)?

A. Armature of small motors/generators
B. Generators and small motors
C. Induction motors
D. High frequency transformers

View Answer

Question 244

Nickel made/clad equipments are suitable for handling

A. Ammonia (both aqueous & anhydrous)
B. Fruit juices, milk & its products and caustic soda solution
C. Nitric acid & hydrochloric acid (conc)
D. Sulphuric acid (conc)

View Answer

Question 245

Slow and progressive deformation of a material with time under constant stress is called

A. Creep
B. Erosion
C. Resilience
D. None of these

View Answer

Question 246

Which of the following is not used as the ceramic material in 'cermets'?

A. Silicides
B. Oxides
C. Carbides
D. Nitrides

View Answer

Question 247

The most resistant material to alkaline corrosion is

A. Duriron
B. Nickel
C. Aluminium
D. Karbate

View Answer

Question 248

__________ possesses viscoelastic properties.

A. Cork
B. Glass
C. Graphite
D. Rubber

View Answer

Question 249

Fatigue failure of a material results from __________ stress.

A. Tensile
B. Compressive
C. Fluctuating
D. None of these

View Answer

Question 250

__________ is added in stainless steel to prevent inter crystal corrosion.

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

View Answer

Question 251

__________ is never shipped in glass carboys.

A. Ammonia
B. Acetic acid
C. Phenol
D. Formaldehyde

View Answer

Question 252

Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of

A. Aluminium
B. Stainles steel
C. High silicon (14%) iron
D. Copper

View Answer

Question 253

Trough of an apron conveyor is made of

A. Lead lined concrete vessel
B. Wood
C. Metal
D. Either B or C

View Answer

Question 254

Presence of cobalt in steel improves its

A. Cutting ability
B. Corrosion resistance
C. Tensile strength
D. None of these

View Answer

Question 255

Most suitable material of construction for the storage of concentrated nitric acid is

A. Cast iron
B. Monel
C. Karbate
D. Aluminium or chromium alloys (Cr > 18% for cold acid)

View Answer

Question 256

Which of the following pairs of elements may form an alloy?

A. Iron & carbon
B. Iron & mercury
C. Platinum & mercury
D. None of these

View Answer

Question 257

The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.

A. Abrasive
B. Corrosive
C. Both A & B
D. Neither A nor B

View Answer

Question 258

Pick out the wrong statement.

A. Wrought iron contains about 0.02% carbon
B. Wrought iron can not be easily forged and welded
C. The chilled cast iron does not contain graphite
D. Spheroidal grey cast iron contains graphite flakes

View Answer

Question 259

Softening of hardned steel is done by its

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

View Answer

Question 260

The crystal structure of most of the common metals is

A. Orthorhombic
B. Cubic
C. Hexagonal
D. None of these

View Answer

Question 261

Presence of nickel in steel improves its

A. Corrosion resistance
B. Cutting ability
C. Wear resistance
D. All of the above

View Answer

Question 262

Ceramic materials fabrication can not be done by

A. Welding
B. Slip casting
C. Extrusion
D. Plastic pressing

View Answer

Question 263

Aluminium as a material of construction suffers from the disadvantage of

A. Very high cost
B. Rather low tensile strength
C. Very low strength to weight ratio
D. Scarce availability

View Answer

Question 264

The largest consumption of zinc for alloys is in the making of

A. Bearing metal
B. Brasses
C. Brazing solder
D. Die casting alloys

View Answer

Question 265

Which of the following is a non-magnetic material?

A. Cobalt
B. Zinc
C. Nickel
D. None of these

View Answer

Question 266

Pick out the wrong statement.

A. Bronze is an alloy of copper & tin
B. Brass is an alloy of copper & zinc
C. The alloy named 'German silver' does not contain any silver
D. The ability of a material to fracture without appreciable deformation is called its ductility

View Answer

Question 267

Carbon is present in the combined form (carbide) in case of

A. Pig iron
B. Steel
C. Ferroalloys
D. All of the above

View Answer

Question 268

Rubber lined pumps can be used to pump

A. Caustic soda
B. Chlorinated brine
C. Hypochlorous acid
D. All of the above

View Answer

Question 269

Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)

A. Do not require heat treatment for any of its applications
B. Are used for leaf and coiled springs
C. Do not have good resilience properties
D. Is tempered at 850°C

View Answer

Question 270

When the steel is subjected to normalising, its __________ decreases.

A. Yield point
B. Ductility
C. Ultimate tensile strength (UTS)
D. None of these

View Answer

Question 271

Molybdenum steels containing 0.15 to 0.40% molybdenum

A. Are prone to temper brittleness
B. Are used for automobile parts like gears, axle, shaft, bearings etc
C. Have very poor fatigue resistance
D. Do not contain nickel or chromium or both

View Answer

Question 272

Which one is remelted and poured into moulds to get cast iron?

A. Wrought iron
B. Pig iron
C. Low carbon steel
D. Mild steel

View Answer

Question 273

Reactor used in the production of polyvinyl chloride (PVC) is made of

A. Nickel or glass lined steel
B. Aluminium
C. Tantalum
D. Lead

View Answer

Question 274

Soap kettle used in the production of laundry soap is made of

A. Steel with top section nickel clad or stainless steel
B. Cast iron
C. Nickel
D. Concrete

View Answer

Question 275

In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of

A. Concrete
B. Wood
C. Steel
D. Porcelain

View Answer

Question 276

Cast iron is a __________ material.

A. Brittle
B. Ductile
C. Tough
D. Malleable

View Answer

Question 277

The specific gravity of coal depends mainly on its __________ content.

A. Carbon
B. Volatile matter
C. Ash
D. Moisture

View Answer

Question 278

In a plate type heat exchanger, heat transfer plates are never made of

A. Stainless steel
B. Cast iron
C. Titanium
D. Hastealloy C

View Answer

Question 279

Platinum and silver are corroded by

A. Caustic soda solution
B. Phosphoric acid
C. Sulphuric acid (10%)
D. None of these

View Answer

Question 280

For storing water and acid free benzol, use a __________ vessel.

A. Steel
B. Karbate
C. Stainless steel
D. None of these

View Answer

Question 281

A steel alloy containing 36% nickel is called __________ , which has a zero co- efficient of expansion.

A. Austenitic stainless steel
B. Heat resisting steel
C. Invar
D. High speed steel

View Answer

Question 282

Hydrocyanic acid is not shipped in

A. Cast iron vessels
B. Steel cylinders
C. Aluminium containers
D. Monel drums

View Answer

Question 283

The carbonating tower used in Solvay process of soda ash manufacture is made of

A. Cast iron
B. Stainless steel
C. Karbate
D. Lead lined steel

View Answer

Question 284

The material of construction of bearings is

A. Cast iron
B. Babbit metal
C. Pig iron
D. Steel

View Answer

Question 285

Metal at the top of the electromotive series is

A. Least active
B. Most stable
C. Most active
D. Most noble

View Answer

Question 286

Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?

A. Monel
B. Stainless steel
C. Graphite
D. Kel-F and teflon

View Answer

Question 287

Chromel (Nichrome) is an alloy of

A. Chromium and molybdenum
B. Nickel and chromium
C. Molybdenum and nickel
D. Chromium and aluminium

View Answer

Question 288

The metals occuring at the lower most position in the electromotive series

A. Do not resist corrosion
B. Resist corrosion very strongly
C. Are very brittle
D. Are heat insulators

View Answer

Question 289

Atmospheric corrosion of metals result from their

A. Slow oxidation
B. Fast oxidation
C. Fast hydration
D. Slow dehydration

View Answer

Question 290

Condenser tubes are not made of

A. Cartridge brass
B. Muntz brass
C. Wood metal
D. Aluminium brass alloy

View Answer

Question 291

Which of the following is the most prone to atmospheric corrosion?

A. Silver
B. Iron
C. Tin
D. Copper

View Answer

Question 292

Bronze is an alloy of copper and

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

View Answer

Question 293

Material of construction of pipe generally used for conveying water in India is

A. Stainless steel
B. Cast iron
C. Wrought iron
D. Lead lined steel

View Answer

Question 294

Centrifugal pump made of pyrex or glass can't be used to pump

A. Milk and fruit juices
B. Alkaline solutions
C. Dilute H₂SO₄ at room temperature
D. Brine

View Answer

Question 295

Babbit metal used for making bearings should have

A. High-co-efficient of friction between journal and bearing
B. Ability to retain lubricant on its surface
C. Low co-efficient of friction between journal and bearing
D. Both B & C

View Answer

Question 296

Tank furnace used for melting of glass is made of

A. Mild steel
B. Cast iron
C. Refractory blocks
D. Stainless steel

View Answer

Question 297

The hardest material just prior to diamond in Mhos scale is

A. Topax
B. Carborundum
C. Corrundum
D. Calcite

View Answer

Question 298

Dip stick used for measuring the level of petro fuels (e.g. petrol, diesel, fuel oil etc.) in the storage tank is usually made of

A. Brass
B. Copper
C. High carbon steel
D. Aluminium

View Answer

Question 299

The process of coating steel sheets by zinc to improve its corrosion resistance is called

A. Calorising
B. Galvanising
C. Zincification
D. Tempering

View Answer

Question 300

The main constituent of carborundum is __________ carbide.

A. Calcium
B. Silicon
C. Boron
D. Aluminium

View Answer

Question 301

Cast iron vessels are not suitable for the storage of

A. Freon
B. H₂SO₄ (95%) at room temperature
C. H₂SO₄ (fuming)
D. Wet SO₂

View Answer

Question 302

Wrought iron is having very high

A. Hardness
B. Strength
C. Corrosion resistance
D. Susceptibility to changes in its properties by heat treatment

View Answer

Question 303

Anodic material used for the cathodic protection of underground buried steel pipeline is

A. Nickel or copper
B. Zinc or magnesium
C. Bronze
D. Brass

View Answer

Question 304

For platinum thermocouples, lead wires are made of

A. Copper & copper-nickel alloys
B. Copper & iron
C. Iron & nickel
D. Tin & nickel

View Answer

Question 305

Presence of high phosphorous in cast iron increases its

A. Fluidity
B. Melting point
C. Shrinkage
D. Tensile strength

View Answer

Question 306

Which of the following is not shipped in mild steel containers?

A. Acetone
B. Ammonia
C. Ethyl alcohol
D. Formic acid

View Answer

Question 307

Ceramic recuperators are generally made of

A. Silicon carbide
B. Calcium carbide
C. Fireclay bricks
D. High alumina bricks

View Answer

Question 308

Hypersil' is a __________ steel.

A. High speed
B. Silicon
C. Molybdenum
D. Tungsten

View Answer

Question 309

Perspex is nothing but

A. Acrylic sheet
B. An elastomer
C. An alloy of lead and tin
D. Aluminium foil clad with bakelite

View Answer

Question 310

Phenol is not shipped in

A. Nickel lined steel tank cars
B. Galvanised or tin lined drums
C. Boxed glass carboys
D. Cast iron containers

View Answer

Question 311

Pick out the wrong statement.

A. Alloys are harder than their component elements
B. Presence of silicon in steel decreases its electrical resistance
C. Karbate is an acid resistant material of construction
D. Nichrome, a steel alloyed with 10% Ni and 20% Cr can be used upto a temperature of 1100°C

View Answer

Question 312

Plastics are

A. Used in very high temperature applications
B. Non-biodegradable
C. Not suitable for drainage pipe manufacture
D. All of the above

View Answer

Question 313

Which of the following is not a copper based alloy with nickel?

A. German silver
B. Monel metal
C. Inconel
D. Constantan

View Answer

Question 314

The presence of impurities in iron

A. Increases its melting point
B. Does not affect its melting point
C. Decreases its melting point
D. Makes it malleable

View Answer

Question 315

Presence of nitrogen in steel

A. Makes it brittle
B. Increases its strength
C. Increases its hardness
D. Is desirable

View Answer

Question 316

Presence of silicon in steel

A. Is in the form of free Si
B. Indicates that steel is not deoxidised properly
C. Decreases the blow holes formation tendency in castings
D. None of these

View Answer

Question 317

Carbon is present in steel wholly in the

A. Combined form
B. Free state as graphite
C. Both A & B
D. Neither A nor B

View Answer

Question 318

Hastelloy C is a good material of construction in chemical process industry, since it is

A. Highly corrosion resistant and is readily fabricated
B. Relatively inexpensive although it can be fabricated with some difficulty
C. Corrosion resistant to most alkalis, particularly because of its coper content
D. Light and resists attack by acids

View Answer

Question 319

Spray dryer for evaporating milk to produce milk powder is made of

A. Lead lined steel
B. Stainless steel
C. Aluminium
D. Cast iron

View Answer

Question 320

Pure nickel is

A. Ferromagnetic above its curie point (i.e., 415°C)
B. Having h.c.p. crystal lattice
C. Ferromagnetic at room temperature
D. Not resistant to oxidation at high temperature

View Answer

Question 321

Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its

A. High strength to weight ratio
B. Low temperature strength properties
C. Its ability to be cast, rolled, forged & stamped
D. High strength and corrosion & oxidation-resistance at elevated temperature

View Answer

Question 322

The most commonly used resin for making reinforced plastic is

A. Unsaturated polyester
B. Polypropylene
C. Polyurathane
D. Nylon-6

View Answer

Question 323

Ability of a material to absorb energy in deformation in the plastic range is characterised as its

A. Ductility
B. Toughness
C. Creep
D. Resilience

View Answer

Question 324

Evaporator used for concentrating tomato juice is made of

A. Nickel
B. Brass
C. Stainless steel-glass lined
D. Cast iron-rubber lined

View Answer

Question 325

Which of the following alloying elements is present in maximum percentage in high speed steel.

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

View Answer

Question 326

Hardest material so far found is

A. Diamond
B. Graphite
C. Carborundum
D. Pumice stone

View Answer

Question 327

A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.

A. 5
B. 100
C. 250
D. 500

View Answer

Question 328

Mild steel storage vessels are suitable for the storage of

A. Anhydrous ammonia
B. Fatty acids
C. Hydrochloric acid (95%)
D. Sulphuric acid (25%)

View Answer

Question 329

In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of

A. Stainless steel
B. Cast iron
C. Lead lined steel
D. Rubber lined steel

View Answer

Question 330

Steel rods are used in reinforced concrete to increase its __________ strength.

A. Shear
B. Tensile
C. Compressive
D. None of these

View Answer

Question 331

Molten phthalic anhydride is stored in a/an __________ vessel.

A. Aluminium
B. Nickel clad steel
C. Lead lined steel
D. Glass lined steel

View Answer

Question 332

Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about

A. Half
B. One third
C. One fifth
D. One twelfth

View Answer

Question 333

High degree of toughness is a must for

A. High speed steel
B. Shock resisting steel
C. Cold work tool steel
D. None of these

View Answer

Question 334

Concrete tank can be used to store

A. Alum
B. Ferrous sulphate
C. Sulphuric acid
D. Saturated brine

View Answer

Question 335

An elastic behaviour of materials is expressed in terms of

A. Hysterisis loop area
B. Stress-strain curve
C. Relaxation time
D. None of these

View Answer

Question 336

Nitriding of steel is done (in electric furnace) at __________ °C.

A. 510
B. 1720
C. 2210
D. 910

View Answer

Question 337

Cast iron and steel pipes are produced by __________ casting.

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

View Answer

Question 338

Super conductors are those substances, which

A. Offer no resistance to current flow
B. Conduct electricity at low temperature
C. Offer high resistance to current flow
D. Conduct electricity at high temperature

View Answer

Question 339

Presence of 0.3 to 0.5% arsenic in copper increases its

A. Ductility
B. Malleability
C. Tenacity & hardness
D. Electrical conductivity

View Answer

Question 340

Amount of energy that a material can absorb before its fracture is a measure of its

A. Toughness
B. Resilience
C. Malleability
D. Ductility

View Answer

Question 341

Iron rust is

A. Ferrous oxide
B. Hydrated ferric oxide
C. Powdered iron
D. Ferric sulphide

View Answer

Question 342

Which of the following is a low melting point metal?

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

View Answer

Question 343

Which of the following is the most elastic material?

A. Plastic
B. Glass
C. Steel
D. Rubber

View Answer

Question 344

Visco-elastic behaviour of materials which is time dependent is common in

A. Plastics
B. Crystalline solid
C. Non-crystalline solids
D. Non-crystalline organic polymer

View Answer

Question 345

Nickel (76%) and chromium (15%) alloys are termed as

A. Inconel
B. Monel
C. Aluminium bronzes
D. Brass

View Answer

Question 346

Karbate is

A. A mixture of iron dust and saw dust
B. Carbon impregnated with resin (usually bakelite)
C. An acid resistant material
D. Both B and C

View Answer

Question 347

Kel-F is a material, which is

A. Chemically known as polychlorotrifluor-oethylene (PTFE)
B. Having excellent chemical & high temperature resistance (upto 200°C)
C. Having elastomeric properties
D. All of the above

View Answer

Question 348

Hot working of lead is carried out at

A. 75° C
B. 373° K
C. 150° C
D. Room temperature

View Answer

Question 349

A chemical change takes place when iron

A. Rusts
B. Melts
C. Is heated
D. None of these

View Answer

Question 350

Addition of 2% nickel in steel makes it suitable for making

A. Electronic valves
B. Boiler plates, rivets etc
C. Turbine blades
D. Connecting rod

View Answer

Question 351

Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?

A. Silicone rubber, teflon, procelain and wood
B. Nickel, monel, stainless steel and graphite
C. Aluminium, copper, high silicon iron
D. Brass, cast iron, mild steel and tin

View Answer

Question 352

Cold work tool steel should have

A. High toughness
B. Poor hardenability
C. High wear resistance
D. All of the above

View Answer

Question 353

Pick out the wrong statement.

A. Etal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure
B. Etal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure
C. Ungsten has a body centred cubic (bcc) crystal lattice structure
D. Oth ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure

View Answer

Question 354

The softest material in Mho's scale (for measuring hardness) is

A. Talc
B. Gypsum
C. Rubber
D. None of these

View Answer

Question 355

Lead

A. Is the hardest metal in common use
B. Is the lightest metal in common use
C. Can not be scratched by finger nails
D. Can not be work hardened

View Answer

Question 356

Lead is

A. Not resistant to corrosion
B. Used as a cathodic material
C. Not used as pigment (in its compound forms) for paints
D. Used as a shock absorber (in mattress form) between the foundation an steel framework of skyscrapper buildings

View Answer

Question 357

Lead pipe is

A. Especially resistant to solutions containing H₂SO₄
B. Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
C. Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
D. All of the above

View Answer

Question 358

Hydrochloric acid absorber in made of

A. Cast iron
B. Mild steel
C. Karbate
D. Stainless steel

View Answer

Question 359

Which of the following is not an alloy of tin?

A. White-bearing metal
B. Pewter type metal
C. Soft solder
D. German silver

View Answer

Question 360

Which of the following is the easiest to bend?

A. Steel
B. Stainless steel
C. Cast iron
D. Wrought iron

View Answer

Question 361

Which of the following alloys does not contain nickel?

A. Chlorinet - 2 alloy
B. Monel
C. Inconel
D. Babbit metal

View Answer

Question 362

Galvanising is generally done on

A. Non-ferrous metals
B. Low carbon steel
C. Stainless steel
D. Cast iron

View Answer

Question 363

Polymorphism is not exhibited by

A. Carbon
B. Iron
C. Phosphorous
D. None of these

View Answer

Question 364

Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of

A. Concrete
B. Steel
C. Zircalloy
D. Graphite

View Answer

Question 365

__________ is used for examining the macro-structure of a material.

A. Metallurgical microscope
B. Optical microscope
C. X-rays
D. Visual inspection by naked eye

View Answer

Question 366

Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium

A. Tin, nickel, iron and chromium
B. And graphite
C. And copper
D. None of these

View Answer

Question 367

Manganese in steel affects its

A. Ductility
B. Tensile strength
C. Hardness
D. None of these

View Answer

Question 368

Which of the following contains maximum percentage of carbon?

A. Boiler plate steel
B. Rail steel
C. Saws for cutting steel
D. Railway spring steel

View Answer

Question 369

The phenomenon in which slow extension of material takes place with the time at constant load is called

A. Plasticity
B. Creep
C. Elasticity
D. Ductility

View Answer

Question 370

The fermentor used in the production of pencillin (by deep fermentation process) is made of

A. Glass
B. Glass lined steel
C. High silicon cast iron
D. Procelain

View Answer

Question 371

Among the tin containing alloys, __________ consumes the maximum amount of tin.

A. Solder
B. White metal
C. Pewter matal
D. Bronzes

View Answer

Question 372

Metalloid is

A. Highly electronegative in nature
B. An element which exhibits the properties of both metal & non-metal
C. An alloy
D. All of the above

View Answer

Question 373

Combination of metals and ceramics are called

A. Metalloy
B. Cermets
C. Pellets
D. Non-crystalline ceramics

View Answer

Question 374

Mild steel is

A. A low carbon steel (0.05 to 0.3% carbon)
B. Highly resistant to corrosion (as much as stainless steel)
C. A high carbon steel (0.5 to 1.5% carbon)
D. Very poor in strength & ductility

View Answer

Question 375

Pick out the wrong statement.

A. The toughness of a material decreases, when it is heated
B. Crane hooks are normally made of wrought iron
C. Cold working of a metal decreases its fatigue strength
D. The temperature at which new grains are formed in a metal is known as the recrystallisation temperature

View Answer

Question 376

Mild steel is used for making

A. Fish plates
B. Die block
C. Channels
D. Drop forging

View Answer

Question 377

Monel alloy is

A. The costliest of all the alloys of nickel
B. Not suitable for making kitchen utensils
C. Used for making steam valves and turbine blades as it resists steam attack at high temperature
D. Not used in cast and wrought forms

View Answer

Question 378

Monel metal is an alloy of

A. Molybdenum and nickel
B. Nickel and copper
C. Molybdenum and aluminium
D. Molybdenum and zinc

View Answer

Question 379

The formation of oxide film on a metal due to atmospheric exposure reduces its

A. Toughness
B. Stiffness
C. Creep limit
D. All of the above

View Answer

Question 380

Which of the following mechanical properties of a material is most structure insensitive?

A. Modulus of elasticity (young
B. Toughness
C. Percentage reduction of area
D. Tensile strength

View Answer

Question 381

__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.

A. Solid solution hardening
B. Screw dislocation
C. Strain ageing
D. Twinning

View Answer

Question 382

Muntz metal is a/an alloys of

A. Magnesium & tin
B. Ferrous material
C. Lead & tin
D. Copper & zinc

View Answer

Question 383

Caustic soda is transported in __________ lined containers.

A. Glass
B. Nickel
C. Neoprene
D. Either B or C

View Answer

Question 384

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with

A. Acidic refractory
B. Rubber
C. Karbate
D. Lead or acid-proof bricks

View Answer

Question 385

Which of the following is an alloy of nickel and copper?

A. Hastelloy
B. Duriron
C. Monel
D. Inconel

View Answer

Question 386

Bog iron used for the adsorption of H?S from coke oven gas is

A. An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)
B. Iron impregnated with resin (usually bakelite)
C. Carbon free iron
D. None of these

View Answer

Question 387

Addition of tungsten to steel imparts

A. Magnetic properties
B. Cutting hardness
C. Corrosion resistance
D. Ductility

View Answer

Question 388

With increase in the carbon percentage in the steel, its

A. Hardness increases
B. Ductility reduces
C. Tensile strength increases
D. All of the above

View Answer

Question 389

A material is able to retain the deformation permanently by virtue of its

A. Elasticity
B. Plasticity
C. Ductility
D. Malleability

View Answer

Question 390

Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its

A. Corrosion resistance
B. Tensile strength
C. Machinability
D. Compressive strength

View Answer

Question 391

Maximum permissible sulphur content in steel is __________ percent.

A. 0.015
B. 0.055
C. 0.505
D. 0.805

View Answer

Question 392

Carbon content in steel is __________ percent.

A. 0.1-2
B. 4-6
C. 2-4
D. 0.001-0.01

View Answer

Question 393

Carbon content in plain carbon steel is __________ percent.

A. 0.1 to 0.15
B. 0.35 to 0.45
C. 0.65 to 0.80
D. 0.85 to 1.2

View Answer

Question 394

Constantan used in thermocouples is an alloy of

A. Iron & copper
B. Copper & aluminium
C. Lead & tin
D. None of these

View Answer

Question 395

__________ does not contain tin as an alloying material.

A. Brass
B. Pewter
C. Solder
D. Babbit metal

View Answer

Question 396

Which of the following finds the least commercial use?

A. Pure iron
B. High silicon iron
C. Low carbon steel
D. High carbon steel

View Answer

Question 397

Pick out the wrong statement.

A. Tin can be readily and very easily drawn into very fine wire
B. Tin can be severely cold worked without the necessity of annealing due to its low recrystallisation temperature
C. Tin exists in two allotropic forms
D. The predominant use of tin is in the form of coating for steel & copper alloys

View Answer

Question 398

A hardened steel essentially contains

A. Sorbite
B. Troostite
C. Martensite
D. None of these

View Answer

Question 399

Diamagnetic materials are magnetised

A. Strongly
B. Only slightly
C. With eddy currents only
D. In a direction opposite to that of the applied field

View Answer

Question 400

Which of the following comprises of hydrocarbons?

A. Mica flakes
B. Glass
C. Rubber
D. None of these

View Answer

Question 401

Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.

A. High silicon iron, Kel-F and teflon
B. Tin and wood
C. Silicone rubber
D. Stainless steel

View Answer

Question 402

Which of the following is not an alloy of copper?

A. Muntz metal
B. Admirability gun metal
C. German silver
D. Pewter metal

View Answer

Question 403

Tempering of steel is done to make it

A. Brittle
B. Hard
C. Rollable
D. Soft

View Answer

Question 404

Galvanising (i.e., zinc coating) of steel sheets is done to

A. Prevent its rusting by contact with corrosive atmosphere
B. Protect the base metal by cathodic protection
C. Both A & B
D. Neither A nor B

View Answer

Question 405

Nickel is a constituent of

A. Bronze
B. Solder
C. Duralumin
D. Monel metal

View Answer

Question 406

Which of the following heat treatment processes is used for softening the hardened material?

A. Normalising
B. Tempering
C. Annealing
D. None of these

View Answer

Question 407

Stainless steel is not corroded by

A. Hydrochloric acid (10%)
B. Nitric acid (10%)
C. Sulphuric acid (10%)
D. Saturated brine

View Answer

Question 408

Which of the following stainless steels is non-magnetic?

A. Ferritic
B. Martensitic
C. Austenitic
D. None of these

View Answer

Question 409

Corrosion resistance of steel is increased by the addition of

A. Phosphorous and tungsten
B. Nickel and chromium
C. Lead and vanadium
D. Molybdenum and tungsten

View Answer

Question 410

Tin in its pure form is used for making

A. Cans for food packing
B. Collapsible tubes for toilet preparations
C. Foil for wrapping cheese
D. All of the above

View Answer

Question 411

All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain

A. Increases very quickly
B. Decreases very quickly
C. Increases in proportion to stress
D. Decreases in proportion to stress

View Answer

Question 412

Acetaldehyde is shipped in __________ drums.

A. Cast iron
B. Steel
C. Aluminium
D. Either B & C

View Answer

Question 413

Aqueous nitric acid is stored in __________ vessel.

A. Plain carbon steel
B. Stainless steel
C. Cast iron
D. Thermosetting plastic material

View Answer

Question 414

Babbit metals used for making bearings are

A. Tin or lead based alloys
B. Short of antifrictional properties
C. Having homogenous microstructure
D. Yellow metals

View Answer

Question 415

Presence of manganese in alloy steel improves its

A. Corrosion resistance
B. Cutting ability
C. Abrasion resistance & toughness
D. Elasticity & creep resistance

View Answer

Question 416

Glass lined vessels are not used for handling

A. Dilute HNO₃
B. Dilute HNO₃
C. Dilute HCI
D. Hydroflouric acid

View Answer

Question 417

Thermosetting resins are those polymers, which

A. Do not increase in plasticity with rise in temperature
B. Allow slip to occur between molecules
C. Do not take on a permanent set
D. None of these

View Answer

Question 418

Lead lined equipments & vessels are suitable for handling

A. Hydrochloric acid (10%)
B. Nitric acid
C. Sulphuric acid upto 60°C
D. All of the above

View Answer

Question 419

Semi steel' is

A. Produced by adding 10-20% steel to the cupola charge
B. Stronger than cast iron
C. Both A & B
D. Neither A nor B

View Answer

Question 420

Carbon supply in pack carburising process is in the form of

A. Charcoal
B. Calcium carbide
C. Hydrocarbon oil
D. Graphite

View Answer

Question 421

Thermoplastic resins are those polymers, which

A. Has decreased plasticity at increasing temperature
B. Can not be moulded
C. Easily deform under pressure at high temperature
D. None of these

View Answer

Question 422

Most common stainless steel type 316, which is highly resistant to corrosion contains

A. 16-13% Cr 10-14% Ni and 2-3% Mo
B. 20-22% Cr, and 8-10% Ni
C. 2-4% Cr, 22% NI and 2-4% Mo
D. None of these

View Answer

Question 423

Spark plugs are made of

A. High alumina ceramic
B. Metallic carbides
C. Corundum
D. Carborundum

View Answer

Question 424

Which of the following commercial metals is most abundantly found in India?

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

View Answer

Question 425

Maximum carbon content in cast iron is __________ percent.

A. 3.8
B. 5.2
C. 4.8
D. 4.3

View Answer

Question 426

Out of the following, copper vessels are the most suitable for the storage of

A. Bromine
B. Dry chlorine & dry fluorine
C. Nitric acid (95% and fuming)
D. Phosphoric acid (95%) & sulphuric acid (95% and fuming)

View Answer

Question 427

Stainless steel contains

A. Chromium and nickel
B. Copper
C. Aluminium
D. Vanadium

View Answer

Question 428

The digester of a Gobar gas plant is a

A. Mild steel drum
B. Stainless steel vessel
C. Masonry well
D. Cast iron vessel

View Answer

Question 429

The ability of a material to absorb energy in the elastic range is a measure of its

A. Toughness
B. Resilience
C. Malleability
D. Brittleness

View Answer

Question 430

Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system?

A. High silicon iron, silicon rubber, Kel-F and teflon
B. Mild steel and stainless steel
C. Cast iron, tin and aluminium
D. Copper, nickel and monel

View Answer

Question 431

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

A. High co-efficient of thermal expansion
B. Low thermal conductivity
C. High corrosion resistance
D. All of the above

View Answer

Question 432

Rotary kilns in cement industry are lined with____bricks.

A. Fireclay
B. Silica
C. Lead
D. High alumina & high magnesia

View Answer

Question 433

Which of the following is not an alloy of copper and tin?

A. Bell metal
B. Gun metal
C. Admiralty gun metal
D. Monel metal

View Answer

Question 434

Cast iron detachable joint is used in __________ pipes.

A. Steel
B. Cast iron
C. Asbestos cement
D. Reinforced cement concrete

View Answer

Question 435

Containers made of high silicon cast iron (14% Si) are not suitable for the storage of

A. Acetic acid
B. Benzoic & boric acids
C. Phosphoric acid (95%) & sulphuric acid (95%)
D. Hydrochloric acid (concentrated)

View Answer

Question 436

The softest material just next to talc in the Mhos scale is

A. Quartz
B. Gypsum
C. Feldspar
D. Fluorite

View Answer

Question 437

Brass container is suitable for storing

A. Aqueous ammonia
B. Beer
C. H₂SO₄(95%)
D. Phosphoric acid (95%)

View Answer

Question 438

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

View Answer

Question 439

Mild steel is a/an __________ steel.

A. Low carbon
B. Medium carbon
C. High carbon
D. High alloy

View Answer

Question 440

__________ is added in low carbon steel to raise its yield point.

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

View Answer

Question 441

Telfon (PTFE) is corroded by

A. Hydrochloric acid (10%)
B. Hydrochloric acid (95%)
C. Sulphuric acid
D. None of these

View Answer

Question 442

Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a

A. Cermet
B. Glass
C. Thermosetting plastic
D. Metallic alloy

View Answer

Question 443

Electronic structure of a material is generally studied by

A. Metallurgical microscope
B. Electron diffraction
C. Spectroscopic techniques
D. X-ray

View Answer

Question 444

__________ alloys have the highest specific strength of all the structural materials out of the following.

A. Magnetic steel
B. Titanium
C. Chromium
D. Magnesium

View Answer

Question 445

Slow plastic deformation of metals under a constant stress is termed as __________ failure.

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

View Answer

Question 446

Which of the following is the hardest?

A. Cementite
B. Pearlite
C. Austenite
D. Ferrite

View Answer

Question 447

A metallic alloy in general as compared to their pure metal components is

A. More corrosion resistant
B. Having higher melting point
C. Having lower hardness, reactivity and fusibility
D. Having lower electrical conductivity

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Question 448

Thermosetting polymers are

A. Injection moulded
B. Cast molded
C. Extruded
D. None of these

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Question 449

Tin coating is not done by

A. Vaporising
B. Hot dipping
C. Electro deposition
D. Spraying

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Question 450

Tin vessels are corroded by

A. Anhydrous ammonia
B. Aromatic solvents
C. Synthetic detergent solution
D. None of these

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Question 451

Most suitable material for high pressure vessel operating at 500 atm. and 500° C is

A. Molybdenum stainless steel
B. 18/8 stainless steel
C. Mild steel
D. High silicon iron (14% Si)

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Question 452

Titanium metal

A. Exists in three allotropic forms
B. Can not be welded
C. Is used in oceanographic and space exploration applications
D. None of these

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Question 453

Ferric stainless steels compared to austenitic stainless steels

A. Have lower corrosion resistance
B. Are harder to fabricate
C. Are less ductile and hence less suitable for cold pressing
D. All of the above

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Question 454

A measure of toughness of a material is its

A. Percentage elongation
B. Yield strength
C. Ultimate strength
D. Area under stress-strain diagram

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Question 455

Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?

A. Cast iron
B. Steel
C. Nickel
D. Karbate

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Question 456

Which one has the maximum tensile strength out of the following?

A. Nodular cast iron
B. Pig iron
C. White cast iron
D. Grey cast iron

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Question 457

Dielectric strength of a material is

A. Its energy stroage capacity
B. A magnetic property
C. Its capacity to resist the flow of current
D. Its capacity to withstand high voltage

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Question 458

Corrosion involves exchange of electrons in __________ corrosion.

A. Chemical
B. Electrochemical
C. Both A & B
D. Neither A nor B

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Question 459

Materials having __________ lattice structure are usually most ductile.

A. F.c.c.
B. B.c.c.
C. H.c.p.
D. Cubic

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Question 460

__________ steel is widely used for the manufacture of motor car crankshafts.

A. Silicon
B. Nickel
C. Chrome
D. High speed

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Question 461

Fatigue failure of a material may occur, when it is subjected to __________ stress.

A. Fluctuating
B. Tensile
C. Compressive
D. Torsion

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Question 462

Aqueous nitric acid is stored in

A. Steel drum
B. Stainless steel vessel
C. Cast iron vessel lined with acid-proof masonry brick
D. Cast iron vessel

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Question 463

Sulphur melting pit in the sulphuric acid plant is made of

A. Lead lined stainless steel
B. Cast iron
C. Steel or cement-brick lined
D. Hard wood

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Question 464

Maximum consumption of copper is in

A. Utensil manufacture
B. Electrical industry
C. Industrial equipment manufacture
D. Small scale industries

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Question 465

Urea autoclave is made of

A. Cast iron
B. Refractory blocks
C. Stainless steel
D. Lead lined steel

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Question 466

For spinning viscose rayon, the extrusion spinnerettes are made of

A. Platinum or gold alloys
B. High carbon steel
C. Aluminium
D. Nickel

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Question 467

Generally __________ are subjected to galvanising (i.e., zinc coating).

A. Non-ferrous metals
B. Non-metals
C. Low carbon steels
D. Stainless steel

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Question 468

Which of the following will have the highest melting point?

A. Pig iron
B. Mild steel
C. Wrought iron
D. High carbon steel

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Question 469

Water gas generator is made of

A. Carbon steel-brick lined
B. Stainless steel-lead lined
C. Cast iron
D. High carbon steel-procelain lined

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Question 470

Post weld heat treatment is done by

A. Normalising
B. Stress relieving
C. Tempering
D. Solution annealing

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Question 471

When iron is rusted, it is

A. Converted to a fine powder
B. Reduced
C. Oxidised
D. None of these

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Question 472

White metal is an alloy of

A. Lead, tin and cadmium
B. Copper, tin and zinc
C. Copper and lead
D. None of these

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Question 473

Which of the following is the hardest material?

A. Topaz
B. Quartz
C. Corrundum
D. Flourite

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Question 474

Which of the following is the softest material?

A. Quartz
B. Calcite
C. Corrundum
D. Flourite

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Question 475

Wood is corroded by

A. Hydrochloric acid
B. SO₂ (dry or wet)
C. Chlorine (dry or wet)
D. All of the above

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Question 476

Work hardening of a material

A. Decreases its tensile strength
B. Decreases its ductility
C. Increases its ductility
D. Does not affect its ductility

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Question 477

Wrought iron is

A. High carbon iron
B. Highly resistance to acid corrosion
C. Malleable & ductile; and hence is used for chain links, hooks & couplings
D. An alloy of iron, chromium & carbon

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Question 478

Creep is not exhibited at low temperature by

A. Rubber
B. Acrylics
C. Lead
D. Plastics

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Question 479

Silicon percentage in iron castings to have maximum hardness should be about

A. 0.3
B. 0.5
C. 0.8
D. 2.5

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Question 480

Rotary driers are generally made of

A. Cast iron
B. Mild steel
C. High silicon iron (14% Si)
D. Tin lined with refractory bricks

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Question 481

Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of

A. Tungsten
B. Vanadium
C. Silicon
D. All of the above

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Question 482

Which metal is protected by the layer of its own oxide?

A. Iron
B. Silver
C. Calcium
D. Aluminium

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Question 483

Light weight metallic alloy used in aircraft industry is

A. Aluminium
B. High silicon (14%) iron
C. Duralumin
D. Phosphor bronze

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Question 484

Which of the following is not a non-ferrous alloy?

A. Meehanite
B. Magnalium
C. Gun metal
D. Muntz metal

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Question 485

Which has the maximum melting point out of the following?

A. Steel
B. Cast iron
C. Stainless steel
D. Wrought iron

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Question 486

Age hardening is concerned with

A. Copper
B. Brass
C. Duralumin
D. Silver

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Question 487

Aluminium storage vessel can be used to store

A. Aqua regia
B. Ferrous sulphate
C. Hydrochloric acid (10%)
D. None of these

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Question 488

A material no longer behaves elastically beyond

A. Plastic limit
B. Limiting load
C. Elastic limit
D. Breaking load

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Question 489

German silver in an alloy of

A. Copper, nickel and zinc
B. Copper, aluminium and silver
C. Silver, zinc and aluminium
D. Silver, nickel and zinc

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Question 490

Which of the following is the lightest of engineering metals?

A. Magnesium
B. Aluminium
C. Titanium
D. Tin

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Question 491

Glass is corroded by

A. Fluorine (dry or wet)
B. Sulphuric acid
C. Phosphoric acid
D. None of these

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Question 492

Photographic plates are coated with

A. Silver nitrate
B. Silver halide
C. Calcium silicate
D. Metallic silver

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Question 493

Graphite is a good

A. Thermal & electrical insulator
B. Conductor of heat
C. Conductor of electricity
D. Both B & C

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Question 494

Graphite is corroded by

A. Sulphuric acid (10%)
B. Sea water
C. Hydrochloric acid
D. None of these

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Question 495

Fatigue strength of a material increases by

A. Having notches in the specimen
B. Rise in temperature
C. Under stressing the specimen
D. Having scratches on the surface

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Question 496

Which of the following alloy steels is the most suitable for making gun barrels and projectiles?

A. Tungsten steel
B. Molybdenum steel
C. Nickel-chrome steel
D. Cobalt steel

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Question 497

Gun metal is an alloy of

A. Nickel, tin and copper
B. Copper, tin and zinc
C. Copper, phosphorus and nickel
D. Manganese, phosphorus and nickel

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Question 498

Which is the purest form of iron?

A. Wrought iron
B. Pig iron
C. Bessemer iron
D. Grey iron

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Question 499

High speed steel should have high

A. Toughness
B. Wear resistance
C. Hardenability
D. Both B & C

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Question 500

High carbon steel contains more than __________ percent carbon.

A. 0.5
B. 2.2
C. 2.5
D. 2.8

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Question 501

Which of the following exercises most powerful influence on the mechanical properties of steel?

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

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Question 502

Hardened steel is softened by

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

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Question 503

Which of the following has the poorest wel-dability?

A. Low carbon steel
B. Mild steel
C. Wrought iron
D. High-carbon steel

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Question 504

Hastelloy comprises of

A. Copper and tin
B. Copper and nickel
C. Molybdenum and nickel
D. Lead and tin

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Question 505

Reduction in the grain size reduces the __________ of the material.

A. Fatigue resistance
B. Tensile strength
C. Creep resistance
D. All of the above

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Question 506

The 'bomb' in the bomb calorimeter is made of

A. Molybdenum stainless steel
B. Mild steel
C. High silicon iron (14% Si)
D. Copper

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Question 507

Which of the following crystal structures characterises the ferritic stainless steel?

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

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Question 508

__________ is used for determining the tensile strength of steels.

A. Hydraulic press
B. Universal testing machine
C. Mechanical press
D. None of these

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Question 509

Sheardising process is used for

A. Surface coating
B. Heat treatment of high speed steel
C. Cold working on metals
D. None of these

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Question 510

Very high sulphur in pig iron makes

A. Its casting unsound
B. Its hard and machinable
C. Its brittle and malleable
D. All of the above

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Question 511

Which of the following has the highest compressive strength?

A. Wrought iron
B. Cast iron
C. Mild steel
D. High carbon steel

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Question 512

The range of Mho's scale of hardness is from

A. 1 to 15
B. 1 to 8
C. 1 to 10
D. 0 to 10

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Question 513

Purity of electrical grade aluminium should be ≥ __________ percent.

A. 95
B. 99.5
C. 85
D. 90

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Question 514

Which is an amorphous material?

A. Glass
B. Mica
C. Brass
D. Cast iron

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Question 515

Pick out the correct statement.

A. Stainless steel is nothing but chromium coated steel
B. Hardening of a soft metal can be done by alloying it with another metal or non-metal
C. Plastic deformation of a material is its temporary distortion under the action of applied stress
D. Rusting of iron is not electrochemical in nature

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Question 516

Plate and frame filter press is usually made of

A. Mild steel
B. Cast iron
C. Stainless steel
D. Galvanised iron

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Question 517

Which of the following has the least value of ultimate tensile strength (UTS)?

A. Medium carbon steel
B. High carbon steel
C. Cast iron
D. Wrought iron

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Question 518

Maximum consumption of zinc is in

A. Alloying
B. Galvanising
C. Utensil manufacture
D. Electrical industry

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Question 519

Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower

A. Price
B. Corrosion resistance
C. Thermal conductivity
D. Abundant availability

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Question 520

Inconel is an alloy of

A. Tin, zinc and nickel
B. Iron, nickel and chromium
C. Copper and nickel
D. Copper and tin

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Question 521

Non-ferrous metals and hard steels do not exhibit a definite yield point, when pulled in the testing machine and hence for these cases, a better measure of their elastic properties is defined by the __________ stress.

A. Ultimate
B. Yield point
C. Proof
D. None of these

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