Materials and Construction Flashcards

1
Q

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

A

non-crystalline organic polymeric.

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2
Q

Coke oven regenerators are made of __________ bricks.

A

fire clay

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3
Q

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

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4
Q

Shock resisting steels should possess high

A

toughness

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5
Q

The purpose of nitriding the steel is to

A

harden its surface.

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6
Q

Ceramic recuperators are generally made of

A

silicon carbide.

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7
Q

Hammers and railway rails are normally made of

A

high carbon steel

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8
Q

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

A

copper & nickel

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9
Q

The addition of antimony in tin-based alloys improves its

A

deformation resistance.

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10
Q

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

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11
Q

The main purpose of galvanising iron sheets is to

A

prevent the action of water.

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12
Q

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

A

4

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13
Q

Invar used in thermocouples is an alloy of nickel and

A

iron

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14
Q

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

A

hastealloy C

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15
Q

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

acetic acid

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16
Q

Constituents of stellite are

A

cobalt, chromium and tungsten.

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17
Q

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

A

cobalt

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18
Q

Presence of nickel in steel improves its

A

corrosion resistance.

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19
Q

Cementite is

A

all (a), (b) and (c).

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20
Q

Acetylene gas holder is made of

A

steel

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21
Q

Sulphur melting pit in the sulphuric acid plant is made of

A

steel or cement-brick lined.

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22
Q

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

A

corrundum

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23
Q

Percentage elongation of a material is a measure of its

A

ductility

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24
Q

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

A

lead or glass

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25
Q

Heavy duty bearings are usually made of

A

white metal

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26
Q

Dielectric strength of a material is

A

its capacity to withstand high voltage.

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27
Q

Which of the following stainless steels is non-magnetic ?

A

Austenitic

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28
Q

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

A

tungsten, chromium and vanadium

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29
Q

Aluminium as a material of construction suffers from the disadvantage of

A

rather low tensile strength.

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30
Q

Babbit metal used for bearings is a____base alloy.

A

tin

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31
Q

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

A

austenitic

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32
Q

Cast iron has very high

A

compressive strength

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33
Q

Liquid ammonia is shipped in __________ containers.

A

glass

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34
Q

Cermets are __________ materials.

A

refractory

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35
Q

Cast irons are generally specified by their

A

tensile strength

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36
Q

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

A

12-14

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37
Q

White cast iron is not

A

malleable

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38
Q

Galvanised iron is

A

protected from rusting

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39
Q

German silver used for decorative purposes contains maximum percentage of

A

copper

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40
Q

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

A

resist corrosion very strongly.

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41
Q

German silver in an alloy of

A

copper, nickel and zinc.

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42
Q

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

A

monel

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43
Q

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

A

Face centred cubic

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44
Q

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

A

graphite and moving mercury.

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45
Q

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

A

tungsten

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46
Q

Which of the following has the highest compressive strength ?

A

High carbon steel

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47
Q

Zinc is not used

A

as an alloying element in various bronzes.

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48
Q

Refined acetic acid storage vessel are made of

A

aluminium

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49
Q

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

A

cobalt

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50
Q

Constantan is an alloy of

A

Cu (55%) & Ni (45%).

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51
Q

Babbit metals used for making bearings are

A

tin or lead based alloys.

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52
Q

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

A

cold rolled

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53
Q

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

A

Brass, cast iron, mild steel and tin.

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54
Q

Interchain forces are the weakest in case of

A

both rubber & elastomers

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55
Q

__________ possesses viscoelastic properties.

A

Rubber

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56
Q

Steel tower used for the storage of oleum

A

need not be lined.

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57
Q

Plastics are

A

non-biodegradable.

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58
Q

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

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59
Q

Wood is corroded by

A

all (a), (b) and (c)

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60
Q

Brass is an alloy of

A

copper and zinc

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61
Q

Lead

A

can not be work hardened.

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62
Q

Photographic plates are coated with

A

silver halide

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63
Q

Cast iron has

A

elastic limit close to ultimate breaking strength.

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64
Q

Locomotive boiler tubes are made of __________ alloys.

A

arsenic copper

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65
Q

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

A

creep

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66
Q

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

A

Tempering

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67
Q

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

A

Modulus of elasticity (young’s modulus).

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68
Q

Mercury is transported in metal containers made of

A

iron

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69
Q

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

A

Stainless steel

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70
Q

Which of the following has the least carbon percentage ?

A

Wrought iron

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71
Q

The range of Mho’s scale of hardness is from

A

l to10

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72
Q

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

A

Iron & carbon

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73
Q

SO3 is absorbed using H2SO4 in a

A

packed steel tower lined with acid proof bricks.

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74
Q

Carbon percentage in medium carbon steel is around

A

0.35 to 0.5

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75
Q

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

A

lead

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76
Q

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

A

copper bearing steel

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77
Q

Super conductors are those substances, which

A

offer no resistance to current flow.

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78
Q

Cermets are used for making

A

both (a) & (b)

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79
Q

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

A

creep limit

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80
Q

A hardened steel essentially contains

A

martensite

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81
Q

Which one contains the least percentage of carbon ?

A

Wrought iron

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82
Q

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

A

steel

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83
Q

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

A

increases very quickly.

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84
Q

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

A

are used for leaf and coiled springs.

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85
Q

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

A

Inconel

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86
Q

Which of the following alloys does not contain nickel ?

A

Babbit metal

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87
Q

An elastic behaviour of materials is expressed in terms of

A

relaxation time

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88
Q

Pure nickel is

A

ferromagnetic at room temperature.

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89
Q

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

A

die with hammer

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90
Q

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

A

Monel metal

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91
Q

__________ is never shipped in glass carboys.

A

Ammonia

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92
Q

Lead is

A

used as a shock absorber (in mattress form) between the foundation and steel framework of skyscrapper buildings.

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93
Q

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

A

510

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94
Q

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

A

boiler plates, rivets etc.

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95
Q

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

A

gypsum

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96
Q

Fatigue strength of a material increases by

A

under stressing the specimen

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97
Q

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

A

High silicon iron, Kel-F and teflon

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98
Q

Aluminium storage vessel can be used to store

A

none of these

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99
Q

Silicone rubber is not resistant to the corrosive action of

A

both (b) and (c)

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100
Q

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

A

Aluminium

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101
Q

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

endurance limit

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102
Q

Bog iron used for the adsorption of H2S from coke oven gas is

A

an intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide).

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103
Q

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

A

alkalis & alkaline

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104
Q

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

A

tensile

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105
Q

Corrosion involves exchange of electrons in __________ corrosion.

A

both (a) & (b)

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106
Q

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

High frequency transformers.

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107
Q

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

A

Cast iron

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108
Q

__________ does not contain tin as an alloying material.

A

Brass

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109
Q

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

A

more corrosion resistant.

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110
Q

Pick out the wrong statement.

A

Wrought iron can not be easily forged and welded.

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111
Q

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

A

work

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112
Q

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

A

reinforced concrete lined with lead

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113
Q

Bearings subjected to light load are made of

A

phosphorous bronze

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114
Q

Softening of hardned steel is done by its

A

tempering

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115
Q

Maximum permissible sulphur content in steel is __________ percent.

A

0.055

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116
Q

Ceramic materials fabrication can not be done by

A

welding

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117
Q

Which has the maximum melting point out of the following ?

A

Wrought iron

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118
Q

Cast iron is

A

all (a), (b) & (c)

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119
Q

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

A

Phosphorus

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120
Q

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

A

2

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121
Q

Carbon is present in steel wholly in the

A

combined form.

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122
Q

Carbon supply in pack carburising process is in the form of

A

charcoal

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123
Q

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

A

chemical stoneware

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124
Q

Presence of manganese in alloy steel improves its

A

abrasion resistance & toughness.

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125
Q

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

A

lead or acid-proof bricks

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126
Q

A material is called ‘ductile’, if it can be

A

drawn into wires.

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127
Q

A chemical change takes place when iron

A

rusts

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128
Q

Evaporator used for concentrating tomato juice is made of

A

stainless steel-glass lined

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129
Q

High carbon steel contains more than __________ percent carbon.

A

0.5

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130
Q

The main constituent of carborundum is __________ carbide.

A

silicon

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131
Q

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

A

steel

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132
Q

The chlorinator used in the manufacture of DDT is made of

A

glass lined steel

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133
Q

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

A

creep resistance

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134
Q

Age hardening is concerned with

A

duralumin

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135
Q

Which of the following undergoes granular fracture ?

A

Steel

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136
Q

Ball bearings are normally made of __________ steel.

A

chrome

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137
Q

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

A

metal/alloy

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138
Q

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

A

Noble metals (Ag, Pt, Au)

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139
Q

Addition of nickel to copper improves its

A

hardness

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140
Q

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

A

bismuth

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141
Q

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

A

18-20

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142
Q

The ‘bomb’ in the bomb calorimeter is made of

A

molybdenum stainless steel

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143
Q

Which of the following is produced by condensation polymerisation ?

A

Bakelite

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144
Q

The crystal structure of most of the common metals is

A

cubic

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145
Q

Telfon (PTFE) is corroded by

A

none of these

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146
Q

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

A

light and resists attack by acids.

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147
Q

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

A

cast iron

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148
Q

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.

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149
Q

Pick out the wrong statement.

A

Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making.

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150
Q

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

A

ash

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151
Q

Carbon percentage is the same in cast iron and

A

pig iron

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152
Q

Pick out the wrong statement.

A

The ability of a material to fracture without appreciable deformation is called its ductility.

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153
Q

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

A

Lead

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154
Q

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

A

80

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155
Q

Nickel is a constituent of

A

monel metal

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156
Q

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

A

steel with top section nickel clad or stainless steel

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157
Q

Nickel made/clad equipments are suitable for handling

A

fruit juices, milk & its products and caustic soda solution.

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158
Q

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

A

copper

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159
Q

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

A

platinum

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160
Q

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

A

normalising

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161
Q

Mild steel is used for making

A

channels

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162
Q

Presence of 0.3 to 0.5% arsenic in copper increases its

A

tenacity & hardness

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163
Q

The heat treatment process applied to cold formed steel parts is

A

solution annealing

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164
Q

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

A

brasses

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165
Q

Plate and frame filter press is usually made of

A

cast iron

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166
Q

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

A

rubber or durmet-20 lined

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167
Q

Nickel and copper are the basic constituents of

A

monel metal

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168
Q

Copper has very low

A

tensile strength

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169
Q

Hardest material so far found is

A

Hardest material so far found is

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170
Q

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

A

aluminium or chromium alloys (Cr > 18% for cold acid)

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171
Q

The most resistant material to alkaline corrosion is

A

nickel

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172
Q

Tin coating is not done by

A

vaporising

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173
Q

Stainless steel is not corroded by

A

nitric acid (10%).

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174
Q

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

A

Niobium

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175
Q

Nickel is a __________ material.

A

ferromagnetic

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176
Q

Babbit metal is not a

A

pure metal

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177
Q

Which of the following alloys does not contain nickel ?

A

Babbit metal

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178
Q

Which of the following is the lightest of engineering metals ?

A

Magnesium

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179
Q

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

A

monel metal

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180
Q

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

A

both (a) and (b).

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181
Q

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

A

glass lined steel

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182
Q

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

A

inconel

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183
Q

Low carbon steels are those in which carbon percentage is around

A

0.1 to 0.35

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184
Q

White metal is an alloy of

A

none of these

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185
Q

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

A

cast iron

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186
Q

For platinum thermocouples, lead wires are made of

A

copper & copper-nickel alloys.

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187
Q

High resistance electrical heating elements/wire are not made of

A

marageing steel

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188
Q

Cast irons are generally specified by their

A

tensile strength

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189
Q

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

A

Pig iron

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190
Q

Wood metal is not used for making

A

storage tank for storing brine and caustic soda.

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191
Q

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

A

monel

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192
Q

Which of the following is the hardest ?

A

Austenite

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193
Q

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

A

Nickel-chrome steelZircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium

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194
Q

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

A

sintering

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195
Q

Sulphuric acid pickling tanks are lined with

A

rubber

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196
Q

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

A

brass

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197
Q

Ceramic materials are

A

stronger in compression than in tension

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198
Q

Which is an amorphous material ?

A

Glass

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199
Q

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

A

cast iron

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200
Q

Platinum and silver are corroded by

A

none of these

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201
Q

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

A

tin, nickel, iron and chromium

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201
Q

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

A

flanges

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201
Q

Work hardening of a material

A

decreases its ductility.

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201
Q

The material used in the filament of electric bulbs is

A

tungsten

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201
Q

Caustic soda can be stored in __________ drums.

A

steel

202
Q

Wrought iron is

A

malleable & ductile; and hence is used for chain links, hooks & couplings.

203
Q

Perspex is nothing but

A

acrylic sheet

204
Q

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

A

alkaline solutions.

205
Q

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

A

absorb vibration

206
Q

Corrosion resistance of steel is increased by the addition of

A

nickel and chromium.

207
Q

Hydrochloric acid is __________ corrosive to common metals.

A

highly

208
Q

Tank furnace used for melting of glass is made of

A

refractory blocks

209
Q

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

A

stainless steel

210
Q

Chromel (Nichrome) is an alloy of

A

nickel and chromium.

211
Q

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

A

Duralumin

212
Q

Thermoplastic resins are those polymers, which

A

easily deform under pressure at high temperature.

213
Q

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

A

recrystallisation

214
Q

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

A

aluminium

215
Q

Fatigue failure of a material results from __________ stress.

A

fluctuating

216
Q

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

A

glass

217
Q

Pick out the wrong statement.

A

Tungsten has a body centred cubic (bcc) crystal lattice structure.

218
Q

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

A

toughness

219
Q

Monel alloy is

A

used for making steam valves and turbine blades as it resists steam attack at high temperature.

220
Q

Molybdenum steels containing 0.15 to 0.40% molybdenum

A

are used for automobile parts like gears, axle, shaft, bearings etc.

221
Q

Kel-F is a material, which is

A

all (a), (b) and (c).

222
Q

Presence of high amount of silicon in cast iron

A

increases the formation of graphite.

223
Q

Rubber lined pumps can be used to pump

A

all (a), (b) and (c)

224
Q

Titanium metal

A

is used in oceanographic and space exploration applications.

225
Q

Purity of electrical grade aluminium should be ≥ __________ percent.

A

99.5

226
Q

Maximum consumption of zinc is in

A

galvanising

227
Q

Hardest materials so far found is

A

diamond

228
Q

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

A

sheradising

229
Q

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

A

Aluminium

230
Q

Tin vessels are corroded by

A

none of these

231
Q

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

A

dry chlorine & dry fluorine.

232
Q

Tempering of steel is done to make it

A

soft

233
Q

Concrete tank can be used to store

A

saturated brine

234
Q

Zinc is highly __________ at room temperature.

A

resistant to atmospheric corrosion

235
Q

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

A

Silicon

236
Q

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

A

16-13% Cr 10-14% Ni and 2-3% Mo.

237
Q

Sheardising process is used for

A

surface coating.

238
Q

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

A

18

239
Q

Which of the following is a non-magnetic material ?

A

Zinc

240
Q

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

A

constantan

241
Q

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

A

cast iron

242
Q

Rotary driers are generally made of

A

mild steel

243
Q

Presence of high phosphorous in cast iron increases its

A

fluidity

244
Q

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

A

creep

245
Q

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

A

malleable

246
Q

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

A

Visual inspection by naked eye

247
Q

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

A

900

248
Q

Dry chlorine can be handled in a vessel made of

A

iron or steel

249
Q

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

A

nickel

250
Q

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

A

carbon chrome

251
Q

Beehive coke ovens are made of __________ bricks.

A

silica

252
Q

Muntz metal is a/an alloys of

A

copper & zinc

253
Q

Rotary kilns in cement industry are lined with____bricks.

A

high alumina & high magnesia

254
Q

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

A

0.2

255
Q

Which of the following will have the highest melting point ?

A

Wrought iron

256
Q

Galvanising is generally done on

A

low carbon steel

257
Q

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

A

all (a), (b) & (c)

258
Q

Chilled iron castings are

A

highly wear resistant

259
Q

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

A

5

260
Q

Presence of nitrogen in steel

A

makes it brittle.

261
Q

Very high sulphur in pig iron makes

A

its casting unsound.

262
Q

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

A

toughness

263
Q

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

A

zinc or magnesium

264
Q

Bush bearings are made of

A

phosphorous bronze

265
Q

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

A

powerful magnets

266
Q

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

A

creep

267
Q

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

A

silicon

268
Q

Pick out the wrong statement

A

both (b) and (c)

269
Q

Duriron is

A

all (a), (b) and (c).

270
Q

Pick out the correct statement.

A

Hardening of a soft metal can be done by alloying it with another metal or non-metal.

271
Q

Cast iron detachable joint is used in __________ pipes.

A

steel

272
Q

Tin coating on metals is not done by

A

powder metallurgy

273
Q

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

A

gypsum

274
Q

18/8 stainless steel means, that it contains

A

18% chromium and 8% nickel.

275
Q

Glass is corroded by

A

fluorine (dry or wet)

276
Q

Iron alloyed with carbon upto 2% is called

A

none of these

277
Q

Which of the following is a low melting point metal ?

A

tin

278
Q

Trough of an apron conveyor is made of

A

either (b) or (c)

279
Q

Pick out the wrong statement.

A

Cold working of a metal decreases its fatigue strength.

280
Q

Which of the following finds the least commercial use ?

A

Pure iron

281
Q

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

A

Glass wool and 85% magnesia

282
Q

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

A

0.8

283
Q

Nickel as a material of construction

A

is used as an alloying element for both ferrous & non-ferrous alloys.

284
Q

__________ moulding process can not be used for thermoplastic plastics.

A

Injection

285
Q

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

A

Body centred cubic

286
Q

‘Semi steel’ is

A

both (a) and (b).

287
Q

Gun metal is an alloy of

A

copper, tin and zinc

288
Q

Carbon content in steel is __________ percent.

A

0.1-2

289
Q

Nitriding of steel is a process for

A

case hardening

290
Q

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

A

Vanadium

291
Q

The most distinguished property of malleable cast iron is its high

A

ductility

292
Q

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

proof

293
Q

Which of the following is the hardest material ?

A

Corrundum

294
Q

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.

295
Q

Biological shield in a nuclear power reactor is made of

A

concrete

296
Q

Caustic soda is transported in __________ lined containers.

A

either (b) or (c)

297
Q

Acid proof stoneware

A

all (a), (b) and (c).

298
Q

Diamagnetic materials are magnetised

A

in a direction opposite to that of the applied field.

299
Q

High degree of toughness is a must for

A

shock resisting steel

300
Q

‘Hypersil’ is a __________ steel.

A

silicon

301
Q

__________ can replace tungsten in high speed steel,

A

Molybdenum

302
Q

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

A

sulphuric acid (10%) at room temperature.

303
Q

Bronze is an alloy of copper and

A

tin

304
Q

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

A

Carbon

305
Q

Percentage of silver in German silver is

A

0

306
Q

Balls in a ball mill are usually made of

A

steel

307
Q

DDT is shipped in

A

either (b) or (c)

308
Q

Constantan used in thermocouples is an alloy of

A

none of these

309
Q

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

A

plasticity

310
Q

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

A

Chrome

311
Q

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

A

both(a) & (b).

312
Q

Which of the following is not a nickel based alloy ?

A

Babbit metal

313
Q

Coke oven walls are lined with __________ bricks.

A

silica

314
Q

Iron rust is

A

hydrated ferric oxide.

315
Q

Urea autoclave is made of

A

stainless steel

316
Q

Mild steel is

A

a low carbon steel (0.05 to 0.3% carbon).

317
Q

Dilute sulphuric acid is transported in __________ pipes.

A

lead

318
Q

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

A

Titanium

319
Q

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

A

aluminium, tin and rubber.

320
Q

Carbon content in plain carbon steel is __________ percent.

A

0.35 to 0.45

321
Q

Duralumin is an alloy of

A

aluminium, copper and manganese.

322
Q

Silicon percentage in acid resistant cast iron is about

A

14

323
Q

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

A

PTFE and porcelain.

324
Q

Which of the following stainless steels is non-magnetic ?

A

Austenitic

325
Q

A magnetic material becomes __________ above the Curie temperature.

A

paramagnetic

326
Q

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

A

Meehanite

327
Q

Which of the following is the most elastic material ?

A

Steel

328
Q

Water gas generator is made of

A

carbon steel-brick lined

329
Q

The digester of a Gobar gas plant is a

A

masonry well

330
Q

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

A

hardness

331
Q

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

A

monel

332
Q

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

A

low carbon steels

333
Q

A material no longer behaves elastically beyond

A

elastic limit

334
Q

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

A

ductility

335
Q

The most commonly used resin for making reinforced plastic is

A

unsaturated polyester

336
Q

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

A

molybdenum stainless steel.

337
Q

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

A

20-30

338
Q

Dies for wire drawing are generally made of

A

carbides

339
Q

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

340
Q

Which of the following contains maximum percentage of carbon ?

A

Saws for cutting steel

341
Q

Tempering of steel is done to make it

A

soft

342
Q

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

A

high strength to weight ratio.

343
Q

Babbit metal used for making bearings should have

A

high-co-efficient of friction between journal and bearing.

344
Q

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

A

steel or iron

345
Q

For spinning viscose rayon, the extrusion spinnerettes are made of

A

platinum or gold alloys

346
Q

Alpha iron is stable __________ °C.

A

upto 910

347
Q

Babbit metal (used for making bearings) comprises of

A

mainly tin (85%) and lead.

348
Q

Hydrochloric acid is stored in a __________ steel vessel.

A

rubber lined

349
Q

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.

350
Q

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

A

Tungsten

351
Q

Electronic structure of a material is generally studied by

A

spectroscopic techniques

352
Q

Which of the following has the poorest wel-dability ?

A

High-carbon steel

353
Q

Creep is not exhibited at low temperature by

A

lead

354
Q

Nickel and molybdenum are the basic constituents of

A

hastealloy

355
Q

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

A

manganese

356
Q

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

A

invar

357
Q

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

A

Nitrides

358
Q

Glass lined vessels are not used for handling/storing

A

hydroflouric acid

359
Q

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

A

cast iron

360
Q

Cast iron has

A

its elastic limit very close to ultimate breaking strength.

361
Q

Which of the following is not an alloy of tin?

A

German silver

362
Q

Which of the following is the easiest to bend?

A

Wrought iron

363
Q

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

A

partly crystalline

364
Q

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

A

stainless steel

365
Q

Cast iron and steel pipes are produced by __________ casting.

A

true centrifugal

366
Q

Cold worked steel parts are normally subjected to

A

annealing

367
Q

Graphite is a good

A

both (b) & (c).

368
Q

Lead alone is not used in storing equipment, because it

A

is having low creep strength.

369
Q

H2SO4 (< 50% concentration) is corrosive to

A

aluminium, mild steel, stainless steel, concrete & tin.

370
Q

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

A

steel

371
Q

A bearing metal should not have

A

low thermal conductivity.

372
Q

__________ is not a case hardening process.

A

Annealing

373
Q

Materials having __________ lattice structure are usually most ductile.

A

f.c.c.

374
Q

Invar contains the highest percentage of

A

iron

375
Q

Metalloid is

A

an element which exhibits the properties of both metal & non-metal.

376
Q

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

A

resilience

377
Q

Phenol is not shipped in

A

cast iron containers.

378
Q

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

A

spheroidising

379
Q

Glass lined vessels are not used for handling

A

hydroflouric acid

380
Q

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

A

above the lowest

381
Q

Hydrochloric acid absorber in made of

A

karbate

382
Q

Pick out the wrong statement.

A

Tin can be readily and very easily drawn into very fine wire.

383
Q

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

A

stainless steel

384
Q

Presence of silicon in steel

A

decreases the blow holes formation tendency in castings.

385
Q

Pick the odd man out of the following.

A

Calorising

386
Q

Cold work tool steel should have

A

high wear resistance

387
Q

Aqueous nitric acid is stored in

A

stainless steel vessel

388
Q

Addition of tungsten to steel imparts

A

cutting hardness

389
Q

Hot working of lead is carried out at

A

room temperature

390
Q

Which of the following is a light alloy ?

A

Dow metal

391
Q

Thermosetting resins are those polymers, which

A

do not increase in plasticity with rise in temperature.

392
Q

Ceramic materials

A

all (a), (b) and (c).

393
Q

Light weight metallic alloy used in aircraft industry is

A

duralumin

394
Q

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

A

Monel

395
Q

Gunmetal and bronze are not corroded by the action of

A

synthetic detergent solution.

396
Q

Atmospheric corrosion of metals result from their

A

slow oxidation

397
Q

Karbate is

A

both (b) and (c).

398
Q

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

A

annealing

399
Q

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

A

Nodular cast iron

400
Q

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

A

cast iron

401
Q

Which of the following is the softest material ?

A

Calcite

402
Q

Thermosetting polymers are

A

cast molded

403
Q

Maximum consumption of lead is in the manufacture of

A

storage batteries.

404
Q

Clock pendulums are usually made of __________ steel.

A

none of these

405
Q

Which of the following is produced by addition polymerisation ?

A

Polybutadiene

406
Q

With increase in the carbon percentage in the steel, its

A

all (a), (b) and (c).

407
Q

__________ is used for determining the tensile strength of steels.

A

Universal testing machine

408
Q

Mild steel storage vessels are suitable for the storage of

A

anhydrous ammonia

409
Q

Mild steel is a/an __________ steel.

A

low carbon

410
Q

Hardened steel is softened by

A

tempering

411
Q

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

A

Formic acid

412
Q

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

A

machinability

413
Q

Maximum consumption of copper is in

A

electrical industry.

414
Q

Maximum carbon content in cast iron is __________ percent.

A

4.3

415
Q

Manganese in steel affects its

A

tensile strength

416
Q

Lead lined equipments & vessels are suitable for handling

A

sulphuric acid upto 60°C.

417
Q

Carbon tetrachloride can be stored in a storage vessel made of

A

all (a), (b) and (c)

418
Q

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

A

galvanising

419
Q

__________ does not contain copper as an alloying element,

A

Nichrome

420
Q

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

A

nickel or glass lined steel

421
Q

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

A

Manganese

422
Q

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

A

Grey cast

423
Q

Cast iron vessels are not suitable for the storage of

A

wet SO2

424
Q

Condenser tubes are not made of

A

wood metal

425
Q

Tin in its pure form is used for making

A

all (a), (b) and (c).

426
Q

Addition of __________ in steel is helpful in increasing the depth of hardness.

A

chromium

427
Q

Hydrochloric acid is stored in a__vessel.

A

rubber lined steel

428
Q

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

A

high corrosion resistance.

429
Q

Pick out the wrong statement.

A

Presence of silicon in steel decreases its electrical resistance.

430
Q

Ferric stainless steels compared to austenitic stainless steels

A

all (a), (b) and (c).

431
Q

Liners of a ball mill are never made of

A

lead

432
Q

Most of the common metals have __________ crystal structure.

A

cubic

433
Q

Cast iron is a __________ material.

A

brittle

434
Q

Hydrocyanic acid is not shipped in

A

cast iron vessels.

435
Q

Spark plugs are made of

A

high alumina ceramic

436
Q

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

A

both’a’ & ‘b’

437
Q

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

A

stainles steel

438
Q

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

A

mild steel

439
Q

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

A

ductile

440
Q

Bell metal is an alloy of

A

copper & tin

441
Q

Mercury is transported in metal containers made of

A

iron

442
Q

Lead pipe is

A

all (a), (b) and (c).

443
Q

Inconel is an alloy of

A

iron, nickel and chromium

444
Q

A measure of toughness of a material is its

A

yield strength

445
Q

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

A

stainless steel or glass lined vessel

446
Q

Cast iron is having very high

A

proximity between its elastic limit and ultimate breaking strength.

447
Q

The material of construction of bearings is

A

babbit metal

448
Q

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

A

alkalis & alkaline

449
Q

Hastelloy comprises of

A

molybdenum and nickel

450
Q

Metalloid is

A

an element, which exhibits the properties of both metal & non metal.

451
Q

Stainless steel contains

A

chromium and nickel

452
Q

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

A

abundant availability.

453
Q

Metal at the top of the electromotive series is

A

most active

454
Q

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

A

fluctuating

455
Q

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

A

both (b) and (c)

456
Q

High speed steel should have high

A

both(b) & (c)

457
Q

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

acetic acid

458
Q

An alloy of iron containing 4% carbon is called

A

none of these

459
Q

Steel pipes are normally manufactured by __________ process.

A

extrusion

460
Q

Polymorphism is not exhibited by

A

none of these

461
Q

Rubber lined vessels are corroded by the action of

A

all (a), (b) and (c)

462
Q

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

A

Strain ageing

463
Q

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

A

Magnesium

464
Q

Brass container is suitable for storing

A

beer

465
Q

Aqueous nitric acid is stored in __________ vessel.

A

cast iron

466
Q

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

A

mercury

467
Q

Graphite is corroded by

A

none of these

468
Q

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

A

cast iron

469
Q

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

A

solder

470
Q

The hardest material just prior to diamond in Mhos scale is

A

corrundum

471
Q

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

A

abrasive

472
Q

Cast iron compared to steel is better in

A

fluidity & castability

473
Q

Plasticisers are added to polymers to improve their

A

softness & flexibility.

474
Q

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

A

stainless steel or glass lined steel

475
Q

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

A

acidic refractory

476
Q

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

A

talc

477
Q

Acetaldehyde is shipped in __________ drums.

A

either (b) & (c)

478
Q

Monel metal is an alloy of

A

nickel and copper.

479
Q

German silver is an alloy of copper, nickel and

A

zinc

480
Q

The presence of impurities in iron

A

decreases its melting point.

481
Q

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

A

Silicon steel

482
Q

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

A

non-crystalline organic polymer

483
Q

Which of the following is not an alloy of copper ?

A

Pewter metal

484
Q

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

A

Iron

485
Q

As the impurities are oxidised, the melting point of iron

A

increases

486
Q

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

A

cast iron

487
Q

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

A

one fifth

488
Q

Ball bearings are generally made of

A

chrome carbon steel

489
Q

Mild steel is a/an __________ steel.

A

low carbon

490
Q

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

A

chiesels

491
Q

Which is the purest form of iron ?

A

Wrought iron

492
Q

White cast iron as compared to grey cast iron is

A

all (a), (b) & (c)

493
Q

Combination of metals and ceramics are called

A

cermets

494
Q

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

A

White cast

495
Q

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

A

Nickel

496
Q

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

A

glass

497
Q

‘Age hardening’ of duralumin is due to

A

both (a) & (b)

498
Q

__________ is a donor impurity for semi-conductors.

A

Antimony

499
Q

Post weld heat treatment is done by

A

stress relieving

500
Q

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

A

2

501
Q

Presence of cobalt in steel improves its

A

cutting ability

502
Q

In cold working of metal as compared to its hot working

A

appreciable strain hardening is produced.

503
Q

Nickel base alloys with __________ are known as monel metal.

A

copper

504
Q

Wrought iron is having very high

A

corrosion resistance.

505
Q

When iron is rusted, it is

A

oxidised

506
Q

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

A

hydrochloric acid (concentrated).

507
Q

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

A

4

508
Q

Which of the following comprises of hydrocarbons ?

A

Rubber