Materials and Construction

Question 1

The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.
non-crystalline solid
crystalline
rubberry
non-crystalline organic polymeric.

Answer 1

non-crystalline organic polymeric.

Question 2

Coke oven regenerators are made of __________ bricks.
fire clay
silica
low thermal conductivity
high electrical conductivity

Answer 2

fire clay

Question 3

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) ?
Invar
Constantan
Chromel
Alumel

Answer 3

Invar

Question 4

Shock resisting steels should possess high
hardness
toughness
tensile strength
wear resistance

Answer 4

toughness

Question 5

The purpose of nitriding the steel is to
harden its surface.
soften its surface.
improve its reliability.
none of these.

Answer 5

harden its surface.

Question 6

Ceramic recuperators are generally made of
silicon carbide.
calcium carbide.
fireclay bricks.
high alumina bricks.

Answer 6

silicon carbide.

Question 7

Hammers and railway rails are normally made of
mild steel
dead mild steel
medium carbon steel
high carbon steel

Answer 7

high carbon steel

Question 8

Softness of silver can be converted into hardness by alloying it with small quantity of
copper & nickel
zinc
aluminium
tin

Answer 8

copper & nickel

Question 9

The addition of antimony in tin-based alloys improves its
rupture strength and hot hardness.
impact strength and bonding strength.
deformation resistance.
wear resistance.

Answer 9

deformation resistance.

Question 10

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 ?
Lead
Copper
Aluminium
Wrought iron

Answer 10

Lead

Question 11

The main purpose of galvanising iron sheets is to
harden the surface.
increase its glossiness and lustre.
prevent the action of water.
prevent the action of oxygen.

Answer 11

prevent the action of water.

Question 12

The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
0.2
2
4
8

Answer 12

4

Question 13

Invar used in thermocouples is an alloy of nickel and
iron
copper
chromium
lead

Answer 13

iron

Question 14

Nickel (56%) and molybdenum (17%) alloys are called
monel
hastealloy C
inconel
bronzes

Answer 14

hastealloy C

Question 15

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
dilute HCI
acetic acid
concentrated H2SO4
none of these

Answer 15

acetic acid

Question 16

Constituents of stellite are
zinc, copper and nickel.
cobalt, chromium and tungsten.
zinc, aluminium and nickel.
nickel, cobalt and vanadium.

Answer 16

cobalt, chromium and tungsten.

Question 17

Residual magnetism in steel for magnets is increased by the addition of
nickel
cobalt
tungsten
chromium

Answer 17

cobalt

Question 18

Presence of nickel in steel improves its
corrosion resistance.
cutting ability.
wear resistance.
all (a), (b) and (c).

Answer 18

corrosion resistance.

Question 19

Cementite is
Fe3C chemically.
a compound of carbon and iron.
characterised by an orthorhombic crystal structure.
all (a), (b) and (c).

Answer 19

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

Question 20

Acetylene gas holder is made of
copper
cast iron
steel
monel metal

Answer 20

steel

Question 21

Sulphur melting pit in the sulphuric acid plant is made of
lead lined stainless steel.
cast iron.
steel or cement-brick lined.
hard wood.

Answer 21

steel or cement-brick lined.

Question 22

The hardest material just prior to diamond in Mho’s scale is
topax
carborundum
corrundum
calcite

Answer 22

corrundum

Question 23

Percentage elongation of a material is a measure of its
ductility
brittleness
toughness
malleability

Answer 23

ductility

Question 24

Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with
karbate
lead or glass
fireclay bricks
PVC

Answer 24

lead or glass

Question 25

Heavy duty bearings are usually made of
white metal
phosphorous bronze
monel
zinc

Answer 25

white metal

Question 26

Dielectric strength of a material is
its energy stroage capacity.
a magnetic property.
its capacity to resist the flow of current.
its capacity to withstand high voltage.

Answer 26

its capacity to withstand high voltage.

Question 27

Which of the following stainless steels is non-magnetic ?
Ferritic
Martensitic
Austenitic
None of these

Answer 27

Austenitic

Question 28

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

Answer 28

tungsten, chromium and vanadium

Question 29

Aluminium as a material of construction suffers from the disadvantage of
very high cost.
rather low tensile strength.
very low strength to weight ratio.
scarce availability.

Answer 29

rather low tensile strength.

Question 30

Babbit metal used for bearings is a____base alloy.
tin
lead
aluminium
copper

Answer 30

tin

Question 31

18/8 steel is a/an __________ stainless steel.
austenitic
ferritic
martensitic
none of these

Answer 31

austenitic

Question 32

Cast iron has very high
compressive strength
ductility
shock resistance
resistance to brittleness

Answer 32

compressive strength

Question 33

Liquid ammonia is shipped in __________ containers.
steel
aluminium
glass
lead lined

Answer 33

glass

Question 34

Cermets are __________ materials.
refractory
reinforced
abrasive
fully metallic

Answer 34

refractory

Question 35

Cast irons are generally specified by their
carbon content
tensile strength
hardness
manufacturing proces

Answer 35

tensile strength

Question 36

Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
1.5-2
3.5-4.5
7-9
12-14

Answer 36

12-14

Question 37

White cast iron is not
malleable
whitish in color
brittle
strong and hard

Answer 37

malleable

Question 38

Galvanised iron is
harder
protected from rusting
alumina coated iron
none of these

Answer 38

protected from rusting

Question 39

German silver used for decorative purposes contains maximum percentage of
silver
copper
zinc
nickel

Answer 39

copper

Question 40

The metals occuring at the lower most position in the electromotive series
do not resist corrosion.
resist corrosion very strongly.
are very brittle.
are heat insulators.

Answer 40

resist corrosion very strongly.

Question 41

German silver in an alloy of
copper, nickel and zinc.
copper, aluminium and silver.
silver, zinc and aluminium.
silver, nickel and zinc.

Answer 41

copper, nickel and zinc.

Question 42

A suitable material of construction to use with fuming sulphuric acid is
carbon steel
stainless steel type 304
nickel
monel

Answer 42

monel

Question 43

Which of the following crystal structures characterises the austenitic stainless steel?
Simple hexagonal
Body centred cubic
Face centred cubic
None of these

Answer 43

Face centred cubic

Question 44

Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
moving mercury and graphite.
graphite and moving mercury.
moving mercury and carbon.
moving mercury and crimped steel wire.

Answer 44

graphite and moving mercury.

Question 45

Addition of __________ in steel can help in increasing the depth of hardness.
nickel
chromium
vanadium
tungsten

Answer 45

tungsten

Question 46

Which of the following has the highest compressive strength ?
Wrought iron
Cast iron
Mild steel
High carbon steel

Answer 46

High carbon steel

Question 47

Zinc is not used
for producing zinc base die casting alloys.
in its oxide form as pigments.
as anode for corrosion prevention in boiler.
as an alloying element in various bronzes.

Answer 47

as an alloying element in various bronzes.

Question 48

Refined acetic acid storage vessel are made of
copper
aluminium
high carbon steel
nickel

Answer 48

aluminium

Question 49

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

Answer 49

cobalt

Question 50

Constantan is an alloy of
Cu (55%) & Sn (45%).
Cu (55%) & Ni (45%).
Pt (95%) & Rh (10%).
Fe (80%) & Ni (20%).

Answer 50

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

Question 51

Babbit metals used for making bearings are
tin or lead based alloys.
short of antifrictional properties.
having homogenous microstructure.
yellow metals.

Answer 51

tin or lead based alloys.

Question 52

Pipes for bi-cycle frames are made of __________ steel.
hot rolled
chrome carbon
cold rolled
stainless

Answer 52

cold rolled

Question 53

Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ?
Silicone rubber, teflon, procelain and wood.
Nickel, monel, stainless steel and graphite.
Aluminium, copper, high silicon iron.
Brass, cast iron, mild steel and tin.

Answer 53

Brass, cast iron, mild steel and tin.

Question 54

Interchain forces are the weakest in case of
plastics
fibres
elastomers
both rubber & elastomers

Answer 54

both rubber & elastomers

Question 55

__________ possesses viscoelastic properties.
Cork
Glass
Graphite
Rubber

Answer 55

Rubber

Question 56

Steel tower used for the storage of oleum
is lined with lead.
need not be lined.
is lined with rubber.
is lined with acid-proof bricks.

Answer 56

need not be lined.

Question 57

Plastics are
used in very high temperature applications.
non-biodegradable.
not suitable for drainage pipe manufacture.
all (a), (b) & (c).

Answer 57

non-biodegradable.

Question 58

Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
rubber lined mild steel
lead lined mild steel
aluminium
cast iron

Answer 58

rubber lined mild steel

Question 59

Wood is corroded by
hydrochloric acid
SO2 (dry or wet)
chlorine (dry or wet)
all (a), (b) and (c)

Answer 59

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

Question 60

Brass is an alloy of
nickel and tin
copper and zinc
tin and lead
copper, nickel and zinc

Answer 60

copper and zinc

Question 61

Lead:
is the hardest metal in common use.
is the lightest metal in common use.
can not be scratched by finger nails.
can not be work hardened.

Answer 61

can not be work hardened.

Question 62

Photographic plates are coated with
silver nitrate
silver halide
calcium silicate
metallic silver

Answer 62

silver halide

Question 63

Cast iron has
very high tensile strenth.
high ductility.
high malleability.
elastic limit close to ultimate breaking strength.

Answer 63

elastic limit close to ultimate breaking strength.

Question 64

Locomotive boiler tubes are made of __________ alloys.
arsenic copper
magnesium
aluminium
nickel

Answer 64

arsenic copper

Question 65

Slow and progressive deformation of a material with time under constant stress is called
creep
erosion
resilience
none of these

Answer 65

creep

Question 66

Which of the following heat treatment processes is used for softening the hardened material ?
Normalising
Tempering
Annealing
None of these

Answer 66

Tempering

Question 67

Which of the following mechanical properties of a material is most structure insensitive ?
Modulus of elasticity (young’s modulus).
Toughness.
Percentage reduction of area.
Tensile strength.

Answer 67

Modulus of elasticity (young’s modulus).

Question 68

Mercury is transported in metal containers made of
aluminium
iron
lead
nickel

Answer 68

iron

Question 69

Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
Monel
Stainless steel
Graphite
Kel-F and teflon

Answer 69

Stainless steel

Question 70

Which of the following has the least carbon percentage ?
Low carbon steel
Mild steel
Wrought iron
White cast iron

Answer 70

Wrought iron

Question 71

The range of Mho’s scale of hardness is from
l to l5
l to 8
l to10
0 to 10

Answer 71

l to10

Question 72

Which of the following pairs of elements may form an alloy ?
Iron & carbon
Iron & mercury
Platinum & mercury
None of these

Answer 72

Iron & carbon

Question 73

SO3 is absorbed using H2SO4 in a
cast iron packed tower.
stainless steel plate tower.
packed steel tower lined with acid proof bricks.
none of these.

Answer 73

packed steel tower lined with acid proof bricks.

Question 74

Carbon percentage in medium carbon steel is around
0.1 to 0.35
0.35 to 0.5
0.8 to 1.4
1 to 1. 5

Answer 74

0.35 to 0.5

Question 75

The preferred material of construction for storage tanks for 98% sulphuric acid is
aluminium
lead
stainless steel 316
mild steel

Answer 75

lead

Question 76

The fermentor used for the production of ethyl alcohol from molasses is made of
wood
concrete
copper bearing steel
procelain

Answer 76

copper bearing steel

Question 77

Super conductors are those substances, which
offer no resistance to current flow.
conduct electricity at low temperature.
offer high resistance to current flow.
conduct electricity at high temperature.

Answer 77

offer no resistance to current flow.

Question 78

Cermets are used for making
cutting tools
abrasives
both (a) & (b)
neither (a) nor (b)

Answer 78

both (a) & (b)

Question 79

The formation of oxide film on a metal due to atmospheric exposure reduces its
toughness
stiffness
creep limit
all (a), (b) & (c)

Answer 79

creep limit

Question 80

A hardened steel essentially contains
sorbite
troostite
martensite
none of these

Answer 80

martensite

Question 81

Which one contains the least percentage of carbon ?
Wrought iron
High speed steel
Cast iron
Pig iron

Answer 81

Wrought iron

Question 82

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

Answer 82

steel

Question 83

All materials obey Hooke’s law within elastic limit. When elastic limit is reached, the tensile strain
increases very quickly.
decreases very quickly.
increases in proportion to stress.
decreases in proportion to stress.

Answer 83

increases very quickly.

Question 84

Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)
do not require heat treatment for any of its applications.
are used for leaf and coiled springs.
do not have good resilience properties.
is tempered at 850°C.

Answer 84

are used for leaf and coiled springs.

Question 85

Which of the following is not a copper based alloy with nickel ?
German silver
Monel metal
Inconel
Constantan

Answer 85

Inconel

Question 86

Which of the following alloys does not contain nickel ?
Chlorinet - 2 alloy
Monel
Inconel
Babbit metal

Answer 86

Babbit metal

Question 87

An elastic behaviour of materials is expressed in terms of
hysterisis loop area
stress-strain curve
relaxation time
none of these

Answer 87

relaxation time

Question 88

Pure nickel is
ferromagnetic above its curie point (i.e., 415°C).
having h.c.p. crystal lattice.
ferromagnetic at room temperature.
not resistant to oxidation at high temperature.

Answer 88

ferromagnetic at room temperature.

Question 89

In drop forging process, the forging is done by dropping the __________ at high velocity.
hammer
workpiece.
die with hammer
weight on hammer

Answer 89

die with hammer

Question 90

Which of the following is not an alloy of copper and tin ?
Bell metal
Gun metal
Admiralty gun metal
Monel metal

Answer 90

Monel metal

Question 91

__________ is never shipped in glass carboys.
Ammonia
Acetic acid
Phenol
Formaldehyde

Answer 91

Ammonia

Question 92

Lead is
not resistant to corrosion.
used as a cathodic material.
not used as pigment (in its compound forms) for paints.
used as a shock absorber (in mattress form) between the foundation and steel framework of skyscrapper buildings.

Answer 92

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

Question 93

Nitriding of steel is done (in electric furnace) at __________ °C.
510
1720
2210
910

Answer 93

510

Question 94

Addition of 2% nickel in steel makes it suitable for making
electronic valves
boiler plates, rivets etc.
turbine blades
connecting rod

Answer 94

boiler plates, rivets etc.

Question 95

The softest material just next to talc in the Mhos scale is
quartz
gypsum
feldspar
fluorite

Answer 95

gypsum

Question 96

Fatigue strength of a material increases by
having notches in the specimen
rise in temperature
under stressing the specimen
having scratches on the surface

Answer 96

under stressing the specimen

Question 97

Specify the material of construction suitable for handling concentrated HNO3 at 100°C.
High silicon iron, Kel-F and teflon
Tin and wood
Silicone rubber
Stainless steel

Answer 97

High silicon iron, Kel-F and teflon

Question 98

Aluminium storage vessel can be used to store
aqua regia
ferrous sulphate
hydrochloric acid (10%)
none of these

Answer 98

none of these

Question 99

Which metal is protected by the layer of its own oxide ?
Iron
Silver
Calcium
Aluminium

Answer 99

Aluminium

Question 100

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
ultimate tensile strength (U.T.S.)
endurance limit
elastic limit
none of these

Answer 100

endurance limit

Question 101

Bog iron used for the adsorption of H2S from coke oven gas is
an intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide).
iron impregnated with resin (usually bakelite).
carbon free iron.
none of these.

Answer 101

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

Question 102

Wrought iron is a suitable material of construction for handling __________ solutions.
dilute acidic
concentrated acidic
alkalis & alkaline
none of these

Answer 102

alkalis & alkaline

Question 103

Steel rods are used in reinforced concrete to increase its __________ strength.
shear
tensile
compressive
none of these

Answer 103

tensile

Question 104

Corrosion involves exchange of electrons in __________ corrosion.
chemical
electrochemical
both (a) & (b)
neither (a) nor (b)

Answer 104

both (a) & (b)

Question 105

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%) ?
Armature of small motors/generators.
Generators and small motors.
Induction motors.
High frequency transformers.

Answer 105

High frequency transformers.

Question 106

Which of the following has the least value of ultimate tensile strength (UTS) ?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron

Answer 106

Cast iron

Question 107

__________ does not contain tin as an alloying material.
Brass
Pewter
Solder
Babbit metal

Answer 107

Brass

Question 108

A metallic alloy in general as compared to their pure metal components is
more corrosion resistant.
having higher melting point.
having lower hardness, reactivity and fusibility.
having lower electrical conductivity.

Answer 108

more corrosion resistant.

Question 109

Pick out the wrong statement.
Wrought iron contains about 0.02% carbon.
Wrought iron can not be easily forged and welded.
The chilled cast iron does not contain graphite.
Spheroidal grey cast iron contains graphite flakes.

Answer 109

Wrought iron can not be easily forged and welded.

Question 110

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

Answer 110

work

Question 111

Copper is dissolved from its ore by H2SO4 in a percolation tank made of
wood
stainless steel
reinforced concrete lined with lead
high silicon iron (14% Si)

Answer 111

reinforced concrete lined with lead

Question 112

Bearings subjected to light load are made of
white metal
phosphorous bronze
monel
silicon bronze

Answer 112

phosphorous bronze

Question 113

Softening of hardned steel is done by its
normalising
tempering
annealing
carburising

Answer 113

tempering

Question 114

Maximum permissible sulphur content in steel is __________ percent.
0.015
0.055
0.505
0.805

Answer 114

0.055

Question 115

Ceramic materials fabrication can not be done by
welding
slip casting
extrusion
plastic pressing

Answer 115

welding

Question 116

Which has the maximum melting point out of the following ?
Steel
Cast iron
Stainless steel
Wrought iron

Answer 116

Wrought iron

Question 117

Cast iron is
used for making shock resisting parts.
manufactured in cupola and is brittle.
having compressive strength more than its tensile strength.
all (a), (b) & (c)

Answer 117

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

Question 118

Which of the following has no effect on the carbide forming tendency in steels ?
Molybdenum
Phosphorus
Chromium
Vanadium

Answer 118

Phosphorus

Question 119

Approximate value of the modulus of elasticity for steel is about __________ x l06kg/cm2.
0.5
2
40
75

Answer 119

2

Question 120

Carbon is present in steel wholly in the
combined form.
free state as graphite.
both (a) and (b).
neither (a) nor (b).

Answer 120

combined form.

Question 121

Carbon supply in pack carburising process is in the form of
charcoal
calcium carbide
hydrocarbon oil
graphite

Answer 121

charcoal

Question 122

In SO3 absorber (Contact Process), packing material used is of
cast iron
chemical stoneware
karbate
mild steel

Answer 122

chemical stoneware

Question 123

Presence of manganese in alloy steel improves its
corrosion resistance.
cutting ability.
abrasion resistance & toughness.
elasticity & creep resistance.

Answer 123

abrasion resistance & toughness.

Question 124

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
acidic refractory
rubber
karbate
lead or acid-proof bricks

Answer 124

lead or acid-proof bricks

Question 125

A material is called ‘ductile’, if it can be
drawn into wires.
hammered to a thin sheet.
fractured without deformation.
made lustrous by heating it.

Answer 125

drawn into wires.

Question 126

A chemical change takes place when iron
rusts
melts
is heated
none of these

Answer 126

rusts

Question 127

Evaporator used for concentrating tomato juice is made of
nickel
brass
stainless steel-glass lined
cast iron-rubber lined

Answer 127

stainless steel-glass lined

Question 128

High carbon steel contains more than __________ percent carbon.
0.5
2.2
2.5
2.8

Answer 128

0.5

Question 129

The main constituent of carborundum is __________ carbide.
calcium
silicon
boron
aluminium

Answer 129

silicon

Question 130

For storing water and acid free benzol, use a __________ vessel.
steel
karbate
stainless steel
none of these

Answer 130

steel

Question 131

The chlorinator used in the manufacture of DDT is made of
glass
glass lined steel
teflon
bakelite

Answer 131

glass lined steel

Question 132

Reduction in the grain size reduces the __________ of the material.
fatigue resistance
tensile strength
creep resistance
all (a), (b) & (c)

Answer 132

creep resistance

Question 133

Age hardening is concerned with
copper
brass
duralumin
silver

Answer 133

duralumin

Question 134

Which of the following undergoes granular fracture ?
Wrought iron
Steel
Cast iron
None of these

Answer 134

Steel

Question 135

Ball bearings are normally made of __________ steel.
high speed
high carbon
chrome
silicon

Answer 135

chrome

Question 136

The electrical conductivity of a __________ decreases with rise in temperature.
metal/alloy
semi-conductor
dielectric
none of these

Answer 136

metal/alloy

Question 137

Which one occupies the lowermost position in the electromotive series of metals ?
Aluminium
Noble metals (Ag, Pt, Au)
Zinc
Alkali metals (K, Na, Li)

Answer 137

Noble metals (Ag, Pt, Au)

Question 138

Addition of nickel to copper improves its
machinability
ductility
strength
hardness

Answer 138

hardness

Question 139

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

Answer 139

bismuth

Question 140

High speed cutting tool steels contain about __________ percent of tungsten.
6-8
18-20
30-35
50-55

Answer 140

18-20

Question 141

The ‘bomb’ in the bomb calorimeter is made of
molybdenum stainless steel
mild steel
high silicon iron (14% Si)
copper

Answer 141

molybdenum stainless steel

Question 142

Which of the following is produced by condensation polymerisation ?
Bakelite
Polythene
Poly vinyl chloride
Polystyrene

Answer 142

Bakelite

Question 143

The crystal structure of most of the common metals is
orthorhombic
cubic
hexagonal
none of these

Answer 143

cubic

Question 144

Telfon (PTFE) is corroded by
hydrochloric acid (10%)
hydrochloric acid (95%)
sulphuric acid
none of these

Answer 144

none of these

Question 145

Hastelloy C is a good material of construction in chemical process industry, since it is
highly corrosion resistant and is readily fabricated.
relatively inexpensive although it can be fabricated with some difficulty.
corrosion resistant to most alkalis, particularly because of its copper content.
light and resists attack by acids.

Answer 145

light and resists attack by acids.

Question 146

Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
copper
cast iron
aluminium
high carbon steel

Answer 146

cast iron

Question 147

The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called
Bauschinger effect.
Hooke’s effect.
hysterisis.
relaxation.

Answer 147

Bauschinger effect.

Question 148

Pick out the wrong statement.
Pure rubber is as useless as pure gold as a material of construction.
Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making.
Copper has poor weldability.
Reinforced plastics are made from both thermoplastic as well as thermosetting plastics.

Answer 148

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

Question 149

The specific gravity of coal depends mainly on its __________ content.
carbon
volatile matter
ash
moisture

Answer 149

ash

Question 150

Carbon percentage is the same in cast iron and
wrought iron
pig iron
mild steel
high silicon (14%) iron

Answer 150

pig iron

Question 151

Pick out the wrong statement.
Bronze is an alloy of copper & tin.
Brass is an alloy of copper & zinc.
The alloy named ‘German silver’ does not contain any silver.
The ability of a material to fracture without appreciable deformation is called its ductility.

Answer 151

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

Question 152

Which of the following has the highest density and the lowest melting point ?
Stainless steel
Titanium
Lead
Aluminium

Answer 152

Lead

Question 153

In order to be called steel, an alloy should have iron percentage greater than
80
70
90
50

Answer 153

80

Question 154

Nickel is a constituent of
bronze
solder
duralumin
monel metal

Answer 154

monel metal

Question 155

Soap kettle used in the production of laundry soap is made of
steel with top section nickel clad or stainless steel
cast iron
nickel
concrete

Answer 155

steel with top section nickel clad or stainless

Question 156

Nickel made/clad equipments are suitable for handling
ammonia (both aqueous & anhydrous).
fruit juices, milk & its products and caustic soda solution.
nitric acid & hydrochloric acid (conc).
sulphuric acid (conc).

Answer 156

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

Question 157

Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
nickel
copper
stainless steel
brass

Answer 157

copper

Question 158

In hot wire aneomometer used for gas flow measurement, the wire is normally made of
copper
platinum
constantan
chromium

Answer 158

platinum

Question 159

The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
tempering
normalising
annealing
none of these

Answer 159

normalising

Question 160

Mild steel is used for making
fish plates
die block
channels
drop forging

Answer 160

channels

Question 161

Presence of 0.3 to 0.5% arsenic in copper increases its
ductility
malleability
tenacity & hardness
electrical conductivity

Answer 161

tenacity & hardness

Question 162

The heat treatment process applied to cold formed steel parts is
normalising
tempering
artificial ageing
solution annealing

Answer 162

solution annealing

Question 163

The largest consumption of zinc for alloys is in the making of
bearing metal
brasses
brazing solder
die casting alloys

Answer 163

brasses

Question 164

Plate and frame filter press is usually made of
mild steel
cast iron
stainless steel
galvanised iron

Answer 164

cast iron

Question 165

Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
plain carbon steel
stainless steel
rubber or durmet-20 lined
lead

Answer 165

rubber or durmet-20 lined

Question 166

Nickel and copper are the basic constituents of
hastelloy
monel metal
German silver
inconel

Answer 166

monel metal

Question 167

Copper has very low
malleability
ductility
tensile strength
thermal & electrical conductivity

Answer 167

tensile strength

Question 168

Hardest material so far found is
diamond
graphite
carborundum
pumice stone

Answer 168

diamond

Question 169

Most suitable material of construction for the storage of concentrated nitric acid is
cast iron
monel
karbate
aluminium or chromium alloys (Cr > 18% for cold acid)

Answer 169

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

Question 170

The most resistant material to alkaline corrosion is
duriron
nickel
aluminium
karbate

Answer 170

nickel

Question 171

Tin coating is not done by
vaporising
hot dipping
electro deposition
spraying

Answer 171

vaporising

Question 172

Stainless steel is not corroded by
hydrochloric acid (10%).
nitric acid (10%).
sulphuric acid (10%).
saturated brine.

Answer 172

nitric acid (10%).

Question 173

__________ is added in stainless steel to prevent inter crystal corrosion.
Vanadium
Niobium
Chromium
Nickel

Answer 173

Niobium

Question 174

Nickel is a __________ material.
ferromagnetic
diamagnetic
paramagnetic
none of these

Answer 174

ferromagnetic

Question 175

Babbit metal is not a
tin base alloy
white metal
lead base alloy
pure metal

Answer 175

pure metal

Question 176

Which of the following alloys does not contain nickel ?
Chloro, et-2 alloy
Monel
Inconel
Babbit metal

Answer 176

Babbit metal

Question 177

Which of the following is the lightest of engineering metals ?
Magnesium
Aluminium
Titanium
Tin

Answer 177

Magnesium

Question 178

Evaporators used in caustic soda recovery and production plant are made of
monel metal
gun metal
wood metal
babbit metal

Answer 178

monel metal

Question 179

With increase in carbide/graphite ratio in cast iron, its
hardness & brittleness increases.
ductility decreases.
both (a) and (b).
neither (a) nor (b).

Answer 179

both (a) and (b).

Question 180

The fermentor used in the production of pencillin (by deep fermentation process) is made of
glass
glass lined steel
high silicon cast iron
procelain

Answer 180

glass lined steel

Question 181

Nickel (76%) and chromium (15%) alloys are termed as
inconel
monel
aluminium bronzes
brass

Answer 181

inconel

Question 182

Low carbon steels are those in which carbon percentage is around
0.1 to 0.35
0.4 to 0.7
0.8 to 1.5
1.5 to 2

Answer 182

0.1 to 0.35

Question 183

White metal is an alloy of
lead, tin and cadmium
copper, tin and zinc
copper and lead
none of these

Answer 183

none of these

Question 184

The carbonating tower used in Solvay process of soda ash manufacture is made of
cast iron
stainless steel
karbate
lead lined steel

Answer 184

cast iron

Question 185

For platinum thermocouples, lead wires are made of
copper & copper-nickel alloys.
copper & iron.
iron & nickel.
tin & nickel.

Answer 185

copper & copper-nickel alloys.

Question 186

High resistance electrical heating elements/wire are not made of
marageing steel
nimonic alloys
kanthal wire
nichrome

Answer 186

marageing steel

Question 187

Cast irons are generally specified by their
carbon percentage
tensile strength
hardness
iron percentage

Answer 187

tensile strength

Question 188

Which one is remelted and poured into moulds to get cast iron ?
Wrought iron
Pig iron
Low carbon steel
Mild steel

Answer 188

Pig iron

Question 189

Wood metal is not used for making
soft solder.
casting for dental work.
storage tank for storing brine and caustic soda.
fusible safety plug for pressure cooker.

Answer 189

storage tank for storing brine and caustic soda.

Question 190

An ideal material of construction for the storage of 50% caustic soda solution would be
karbate
high silicon cast iron
monel
none of these

Answer 190

monel

Question 191

Which of the following is the hardest ?
Cementite
Pearlite
Austenite
Ferrite

Answer 191

Austenite

Question 192

Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?
Tungsten steel
Molybdenum steel
Nickel-chrome steel
Cobalt steel

Answer 192

Nickel-chrome steel

Question 193

The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
precipitation
fusion
sintering
agglomeration

Answer 193

sintering

Question 194

Sulphuric acid pickling tanks are lined with
nickel
rubber
aluminium
glass

Answer 194

rubber

Question 195

Valves in pipe size of 2” and under are normally made of
wrought iron
brass
bronze
monel

Answer 195

brass

Question 196

Ceramic materials are
organic in nature.
stronger in compression than in tension
always amorphous in nature.
always bad heat conductors.

Answer 196

stronger in compression than in tension

Question 197

Which is an amorphous material ?
Glass
Mica
Brass
Cast iron

Answer 197

Glass

Question 198

In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of
stainless steel
cast iron
lead lined steel
rubber lined steel

Answer 198

cast iron

Question 199

Platinum and silver are corroded by
caustic soda solution
phosphoric acid
sulphuric acid (10%)
none of these

Answer 199

none of these

Question 200

Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium:
tin, nickel, iron and chromium
and graphite
and copper
none of these

Answer 200

tin, nickel, iron and chromium

Question 200

The material used in the filament of electric bulbs is:
nichrome
tungsten
constantan
German silver

Answer 200

tungsten

Question 201

Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
shafts
flanges
gears
shear blades

Answer 201

flanges

Question 202

Caustic soda can be stored in __________ drums.
steel
cast iron
brass
gun metal

Answer 202

steel

Question 203

Work hardening of a material
decreases its tensile strength.
decreases its ductility.
increases its ductility.
does not affect its ductility.

Answer 203

decreases its ductility.

Question 204

Wrought iron is
high carbon iron.
highly resistance to acid corrosion.
malleable & ductile; and hence is used for chain links, hooks & couplings.
an alloy of iron, chromium & carbon.

Answer 204

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

Question 205

Perspex is nothing but
acrylic sheet
an elastomer
an alloy of lead and tin
aluminium foil clad with bakelite

Answer 205

acrylic sheet

Question 206

Centrifugal pump made of pyrex or glass can’t be used to pump
milk and fruit juices.
alkaline solutions.
dilute H2SO4 at room temperature.
brine.

Answer 206

alkaline solutions.

Question 207

Ability of a material to __________ is indicated by its damping capacity.
withstand compression
absorb vibration
absorb shock
none of these

Answer 207

absorb vibration

Question 208

Corrosion resistance of steel is increased by the addition of
phosphorous and tungsten.
nickel and chromium.
lead and vanadium.
molybdenum and tungsten.

Answer 208

nickel and chromium.

Question 209

Hydrochloric acid is __________ corrosive to common metals.
least
not
mildly
highly

Answer 209

highly

Question 210

Tank furnace used for melting of glass is made of
mild steel
cast iron
refractory blocks
stainless steel

Answer 210

refractory blocks

Question 211

Spray dryer for evaporating milk to produce milk powder is made of
lead lined steel
stainless steel
aluminium
cast iron

Answer 211

stainless steel

Question 212

Chromel (Nichrome) is an alloy of
chromium and molybdenum.
nickel and chromium.
molybdenum and nickel.
chromium and aluminium.

Answer 212

nickel and chromium.

Question 213

Which of the following is not an alloy of nickel and chromium ?
Inconel
Hastealloy
Nimonic alloys
Duralumin

Answer 213

Duralumin

Question 214

Thermoplastic resins are those polymers, which
has decreased plasticity at increasing temperature.
can not be moulded.
easily deform under pressure at high temperature.
none of these.

Answer 214

easily deform under pressure at high temperature.

Question 215

The temperature at which new grains are formed in the metal is called the __________ temperature.
eutectic
recrystallisation
upper critical
lower critical

Answer 215

recrystallisation

Question 216

Molten phthalic anhydride is stored in a/an __________ vessel.
aluminium
nickel clad steel
lead lined steel
glass lined steel.

Answer 216

aluminium

Question 217

Fatigue failure of a material results from __________ stress.
tensile
compressive
fluctuating
none of these.

Answer 217

fluctuating

Question 218

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

Answer 218

glass

Question 219

Pick out the wrong statement.
Metal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure.
Metal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure.
Tungsten has a body centred cubic (bcc) crystal lattice structure.
Both ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure.

Answer 219

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

Question 220

Ability of a material to absorb energy in deformation in the plastic range is characterised as its:
ductility
toughness
creep
resilience

Answer 220

toughness

Question 221

Monel alloy is:
the costliest of all the alloys of nickel.
not suitable for making kitchen utensils.
used for making steam valves and turbine blades as it resists steam attack at high temperature.
not used in cast and wrought forms.

Answer 221

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

Question 222

Molybdenum steels containing 0.15 to 0.40% molybdenum:
are prone to temper brittleness.
are used for automobile parts like gears, axle, shaft, bearings etc.
have very poor fatigue resistance.
do not contain nickel or chromium or both.

Answer 222

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

Question 223

Kel-F is a material, which is:
chemically known as polychlorotrifluor-oethylene (PTFE).
having excellent chemical & high temperature resistance (upto 200°C).
having elastomeric properties.
all (a), (b) and (c).

Answer 223

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

Question 224

Presence of high amount of silicon in cast iron:
suppresses the decomposition of Fe3 C.
increases the formation of graphite.
increases the contraction of the metal.
reduces its fluidity.

Answer 224

increases the formation of graphite.

Question 225

Rubber lined pumps can be used to pump:
caustic soda
chlorinated brine
hypochlorous acid
all (a), (b) and (c)

Answer 225

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

Question 226

Titanium metal
exists in three allotropic forms.
can not be welded.
is used in oceanographic and space exploration applications.
none of these.

Answer 226

is used in oceanographic and space exploration applications.

Question 227

Purity of electrical grade aluminium should be ≥ __________ percent.
95
99.5
85
90

Answer 227

99.5

Question 228

Maximum consumption of zinc is in
alloying
galvanising
utensil manufacture
electrical industry

Answer 228

galvanising

Question 229

Hardest materials so far found is
diamond
graphite
carborundum
pumice stone

Answer 229

diamond

Question 230

Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as:
sheradising
parkerising
anodising
none of these

Answer 230

sheradising

Question 231

Which of the following commercial metals is most abundantly found in India ?
Copper
Aluminium
Nickel
Zinc

Answer 231

Aluminium

Question 232

Tin vessels are corroded by
anhydrous ammonia
aromatic solvents
synthetic detergent solution
none of these

Answer 232

none of these

Question 233

Out of the following, copper vessels are the most suitable for the storage of
bromine.
dry chlorine & dry fluorine.
nitric acid (95% and fuming).
phosphoric acid (95%) & sulphuric acid (95% and fuming).

Answer 233

dry chlorine & dry fluorine.

Question 234

Tempering of steel is done to make it
brittle
hard
rollable
soft

Answer 234

soft

Question 235

Concrete tank can be used to store
alum
ferrous sulphate
sulphuric acid
saturated brine

Answer 235

saturated brine

Question 236

Zinc is highly __________ at room temperature.
ductile
resistant to atmospheric corrosion
malleable
brittle

Answer 236

resistant to atmospheric corrosion

Question 237

Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property ?
Silicon
Phosphorus
Sulphur
None of these

Answer 237

Silicon

Question 238

Most common stainless steel type 316, which is highly resistant to corrosion contains
16-13% Cr 10-14% Ni and 2-3% Mo.
20-22% Cr, and 8-10% Ni.
2-4% Cr, 22% NI and 2-4% Mo.
none of these.

Answer 238

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

Question 239

Sheardising process is used for:
surface coating.
heat treatment of high speed steel.
cold working on metals.
none of these.

Answer 239

surface coating.

Question 240

The maximum percentage of chromium that can be added to steel is about
12
18
24
30

Answer 240

18

Question 241

Which of the following is a non-magnetic material ?
Cobalt
Zinc
Nickel
None of these

Answer 241

Zinc

Question 242

An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
constantan
kanthal
chromel
German silver

Answer 242

constantan

Question 243

The material of construction of pressure mills used for squeezing out the juice from sugar cane is:
stainless steel
cast iron
mild steel
monel

Answer 243

cast iron

Question 244

Rotary driers are generally made of
cast iron
mild steel
high silicon iron (14% Si)
tin lined with refractory bricks

Answer 244

mild steel

Question 245

Presence of high phosphorous in cast iron increases its
fluidity
melting point
shrinkage
tensile strength

Answer 245

fluidity

Question 246

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

Answer 246

creep

Question 247

A material capable of undergoing large permanent deformation, when subjected to compression is termed as
malleable
ductile
brittle
none of these

Answer 247

malleable

Question 248

_________ is used for examining the macro-structure of a material.
Metallurgical microscope
Optical microscope
X-rays
Visual inspection by naked eye

Answer 248

Visual inspection by naked eye

Question 249

High speed steel tools retain their hardness upto a temperature of __________ °C.
500
750
900
1100

Answer 249

900

Question 250

Dry chlorine can be handled in a vessel made of
iron or steel
PVC
nickel
brass

Answer 250

iron or steel

Question 251

Brine solution is stored/treated in __________ lined vessels/pipes.
rubber
lead
glass
nickel

Answer 251

nickel

Question 252

Steel balls for ball bearings are generally made of __________ steel.
cast
stainless
free carbon
carbon chrome

Answer 252

carbon chrome

Question 253

Beehive coke ovens are made of __________ bricks.
silica
fireclay
silicon carbide
corundum

Answer 253

silica

Question 254

Muntz metal is a/an alloys of
magnesium & tin
ferrous material
lead & tin
copper & zinc

Answer 254

copper & zinc

Question 255

Rotary kilns in cement industry are lined with____bricks.
fireclay
silica
lead
high alumina & high magnesia

Answer 255

high alumina & high magnesia

Question 256

Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
0.02
0.2
0.35
0.5

Answer 256

0.2

Question 257

Which of the following will have the highest melting point ?
Pig iron
Mild steel
Wrought iron
High carbon steel

Answer 257

Wrought iron

Question 258

Galvanising is generally done on
non-ferrous metals
low carbon steel
stainless steel
cast iron

Answer 258

low carbon steel

Question 259

Carbon is present in the combined form (carbide) in case of
pig iron
steel
ferroalloys
all (a), (b) & (c)

Answer 259

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

Question 260

Chilled iron castings are
easily machinable
soft on surface
highly wear resistant
none of these

Answer 260

highly wear resistant

Question 261

A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.
5
100
250
500

Answer 261

5

Question 262

Presence of nitrogen in steel
makes it brittle.
increases its strength.
increases its hardness.
is desirable.

Answer 262

makes it brittle.

Question 263

Very high sulphur in pig iron makes
its casting unsound.
its hard and machinable.
its brittle and malleable.
all (a), (b) & (c)

Answer 263

its casting unsound.

Question 264

Amount of energy that a material can absorb before its fracture is a measure of its:
toughness
resilience
malleability
ductility

Answer 264

toughness

Question 265

Anodic material used for the cathodic protection of underground buried steel pipeline is
nickel or copper
zinc or magnesium
bronze
brass

Answer 265

zinc or magnesium

Question 266

Bush bearings are made of
mild steel
phosphorous bronze
white metal alloys
none of these

Answer 266

phosphorous bronze

Question 267

Alinco, which is a aluminium-cobalt-nickel steel, is used for making
surgical instruments
powerful magnets
chemical equipments
boiler tubes

Answer 267

powerful magnets

Question 268

Slow plastic deformation of metals under a constant stress is termed as __________ failure.
fatigue
endurance
creep
none of these

Answer 268

creep

Question 269

Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of:
tungsten
vanadium
silicon
all (a), (b) & (c)

Answer 269

silicon

Question 270

Duriron is
acid resistant, brittle and very hard.
high silicon iron.
prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion.
all (a), (b) and (c).

Answer 270

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

Question 271

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

Answer 271

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

Question 272

Cast iron detachable joint is used in __________ pipes.
steel
cast iron
asbestos cement
reinforced cement concrete

Answer 272

steel

Question 273

Tin coating on metals is not done by:
spraying
powder metallurgy
hot dipping
electro-deposition

Answer 273

powder metallurgy

Question 274

The softest material just next to talc in the Mho’s scale is
quartz
gypsum
feldspar
fluorite

Answer 274

gypsum

Question 275

18/8 stainless steel means, that it contains
18% chromium and 8% nickel.
18% chromium and 8% molybdenum.
18% nickel and 8% chromium.
18% molybdenum and 8% chromium.

Answer 275

18% chromium and 8% nickel.

Question 276

Glass is corroded by
fluorine (dry or wet)
sulphuric acid
phosphoric acid
none of these

Answer 276

fluorine (dry or wet)

Question 277

Iron alloyed with carbon upto 2% is called
pig iron
wrought iron
high carbon steel
none of these

Answer 277

none of these

Question 278

Which of the following is a low melting point metal ?
Stainless steel
Wrought iron
Tin
Copper

Answer 278

Tin

Question 279

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

Answer 279

Cold working of a metal decreases its fatigue strength.

Question 280

Which of the following finds the least commercial use ?
Pure iron
High silicon iron
Low carbon steel
High carbon steel

Answer 280

Pure iron

Question 281

Which of the following is the most widely used insulating material for steam carray-ing pipelines ?
Ceramic fibre blanket
Glass wool and 85% magnesia
Vermiculite
Slag wool

Answer 281

Glass wool and 85% magnesia

Question 282

Silicon percentage in iron castings to have maximum hardness should be about
0.3
0.5
0.8
2.5

Answer 282

0.8

Question 283

Nickel as a material of construction
is used as an alloying element for both ferrous & non-ferrous alloys.
is paramagnetic below 415° C (its Curie temperature).
dimagnetic.
has a body centred cubic (bcc) crystal lattice structure.

Answer 283

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

Question 284

__________ moulding process can not be used for thermoplastic plastics.
Compression
Extrusion
Injection
None of these

Answer 284

Injection

Question 285

Which of the following crystal structures characterises the ferritic stainless steel ?
Face centred cubic
Body centred cubic
Simple hexagonal
None of these

Answer 285

Body centred cubic

Question 286

‘Semi steel’ is
produced by adding 10-20% steel to the cupola charge.
stronger than cast iron.
both (a) and (b).
neither (a) nor (b).

Answer 286

both (a) and (b).

Question 287

Gun metal is an alloy of
nickel, tin and copper
copper, tin and zinc
copper, phosphorus and nickel
manganese, phosphorus and nickel

Answer 287

copper, tin and zinc

Question 288

Carbon content in steel is __________ percent.
0.1-2
4-6
2-4
0.001-0.01

Answer 288

0.1-2

Question 289

Nitriding of steel is a process for:
case hardening
spheroidising
normalising
annealing

Answer 289

case hardening

Question 290

Which of the following has a very high carbide forming tendency in steels ?
Silicon
Chromium
Nickel
Vanadium

Answer 290

Vanadium

Question 291

The most distinguished property of malleable cast iron is its high:
ductility
hardness
malleability
none of these

Answer 291

ductility

Question 292

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.
ultimate
yield point
proof
none of these

Answer 292

proof

Question 293

Which of the following is the hardest material ?
Topaz
Quartz
Corrundum
Flourite

Answer 293

Corrundum

Question 294

hich 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 ?
High silicon iron, silicon rubber, Kel-F and teflon.
Mild steel and stainless steel.
Cast iron, tin and aluminium.
Copper, nickel and monel.

Answer 294

High silicon iron, silicon rubber, Kel-F and teflon.

Question 295

Biological shield in a nuclear power reactor is made of:
concrete
steel
cadmium
zircalloy

Answer 295

concrete

Question 296

Acid proof stoneware
has very low strength.
cannot be heated.
is broken by small temperature changes.
all (a), (b) and (c).

Answer 296

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

Question 297

Diamagnetic materials are magnetised
strongly.
only slightly.
with eddy currents only.
in a direction opposite to that of the applied field.

Answer 297

in a direction opposite to that of the applied field.

Question 298

High degree of toughness is a must for
high speed steel
shock resisting steel
cold work tool steel
none of these

Answer 298

shock resisting steel

Question 299

‘Hypersil’ is a __________ steel.
high speed
silicon
molybdenum
tungsten

Answer 299

silicon

Question 300

_________ can replace tungsten in high speed steel,
Chromium
Vanadium
Cobalt
Molybdenum

Answer 300

Molybdenum

Question 301

Polythene (low or high density) containers are not corroded by
sulphuric acid (10%) at room temperature.
nitric acid (95%) at room temperature.
sulphur trioxide at 60°C.
any of these.

Answer 301

sulphuric acid (10%) at room temperature.

Question 302

Bronze is an alloy of copper and
lead
tin
nickel
zinc

Answer 302

tin

Question 303

Which of the following exercises most powerful influence on the mechanical properties of steel ?
Manganese
Carbon
Phosphorous
Silicon

Answer 303

Carbon

Question 304

Percentage of silver in German silver is
5
10
20
0

Answer 304

0

Question 305

Balls in a ball mill are usually made of
steel
cast iron
stainless steel
bronze

Answer 305

steel

Question 306

Constantan used in thermocouples is an alloy of
iron & copper
copper & aluminium
lead & tin
none of these

Answer 306

none of these

Question 307

A material is able to retain the deformation permanently by virtue of its
elasticity
plasticity
ductility
malleability

Answer 307

plasticity

Question 308

__________ steel is widely used for the manufacture of motor car crankshafts.
Silicon
Nickel
Chrome
High speed

Answer 308

Chrome

Question 309

Galvanising (i.e., zinc coating) of steel sheets is done to
prevent its rusting by contact with corrosive atmosphere.
protect the base metal by cathodic protection.
both(a) & (b).
neither (a) nor (b).

Answer 309

both(a) & (b).

Question 310

Which of the following is not a nickel based alloy ?
Inconel
Hastelloys
Nimonics
Babbit metal

Answer 310

Babbit metal

Question 311

Coke oven walls are lined with __________ bricks.
silica
tar-dolomite
low thermal conductivity
fire clay

Answer 311

silica

Question 312

Iron rust is:
ferrous oxide.
hydrated ferric oxide.
powdered iron.
ferric sulphide.

Answer 312

hydrated ferric oxide.

Question 313

Urea autoclave is made of
cast iron
refractory blocks
stainless steel
lead lined steel

Answer 313

stainless steel

Question 314

Mild steel is
a low carbon steel (0.05 to 0.3% carbon).
highly resistant to corrosion (as much as stainless steel).
a high carbon steel (0.5 to 1.5% carbon).
very poor in strength & ductility.

Answer 314

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

Question 315

Dilute sulphuric acid is transported in __________ pipes.
mild steel
lead
copper
special alloys

Answer 315

lead

Question 316

__________ alloys have the highest specific strength of all the structural materials out of the following.
Magnetic steel
Titanium
Chromium
Magnesium

Answer 316

Titanium

Question 317

100% H2SO4 at 30°C can’t be stored in a vessel made/lined with
cast iron and high silicon iron.
mild steel and stainless steel.
aluminium, tin and rubber.
teflon, glass and porcelain.

Answer 317

aluminium, tin and rubber.

Question 318

Carbon content in plain carbon steel is __________ percent.
0.1 to 0.15
0.35 to 0.45
0.65 to 0.80
0.85 to 1.2

Answer 318

0.35 to 0.45

Question 319

Duralumin is an alloy of
aluminium, copper and manganese.
aluminium, nickel and silicon.
aluminium and nickel.
none of these.

Answer 319

aluminium, copper and manganese.

Question 320

Silicon percentage in acid resistant cast iron is about
4
8
14
20

Answer 320

14

Question 321

Concentrated HCl at 30°C can be stored in a vessel made of
PTFE and porcelain.
cast iron and aluminium.
stainless steel and high silicon cast iron.
none of these.

Answer 321

PTFE and porcelain.

Question 322

Which of the following stainless steels is non-magnetic ?
Ferritic
Martensitic
Austenitic
None of these

Answer 322

Austenitic

Question 323

A magnetic material becomes __________ above the Curie temperature.
ferromagnetic
diamagnetic
paramagnetic
none of these

Answer 323

paramagnetic

Question 324

Which of the following is not a non-ferrous alloy ?
Meehanite
Magnalium
Gun metal
Muntz metal

Answer 324

Meehanite

Question 325

Which of the following is the most elastic material ?
Plastic
Glass
Steel
Rubber

Answer 325

Steel

Question 326

Water gas generator is made of
carbon steel-brick lined
stainless steel-lead lined
cast iron
high carbon steel-procelain lined

Answer 326

carbon steel-brick lined

Question 327

The digester of a Gobar gas plant is a
mild steel drum
stainless steel vessel
masonry well
cast iron vessel

Answer 327

masonry well

Question 328

The ability of a material to offer resistance to scratching or indentation is a measure of its
brittleness
toughness
hardness
resilience

Answer 328

hardness

Question 329

Brine (15% concentration) can be stored in a vessel made of
monel
karbate
cast iron
none of these

Answer 329

monel

Question 330

Generally __________ are subjected to galvanising (i.e., zinc coating).
non-ferrous metals
non-metals
low carbon steels
stainless steel

Answer 330

low carbon steels

Question 331

A material no longer behaves elastically beyond
plastic limit
limiting load
elastic limit
breaking load

Answer 331

elastic limit

Question 332

When the steel is subjected to normalising, its __________ decreases.
yield point
ductility
ultimate tensile strength (UTS)
none of these

Answer 332

ductility

Question 333

The most commonly used resin for making reinforced plastic is
unsaturated polyester
polypropylene
polyurathane
nylon-6

Answer 333

unsaturated polyester

Question 334

Most suitable material for high pressure vessel operating at 500 atm. and 500° C is:
molybdenum stainless steel.
18/8 stainless steel.
mild steel.
high silicon iron (14% Si).

Answer 334

molybdenum stainless steel.

Question 335

Brinell Hardness Number (BHN) for talc is approximately in the range of
1-5
20-30
100 -150
200 - 250

Answer 335

20-30

Question 336

Dies for wire drawing are generally made of
mild steel
stainless steel
carbides
high carbon steel

Answer 336

carbides

Question 337

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:
brass
copper
high carbon steel
aluminium

Answer 337

brass

Question 338

Which of the following contains maximum percentage of carbon ?
Boiler plate steel
Rail steel
Saws for cutting steel
Railway spring steel

Answer 338

Saws for cutting steel

Question 339

Tempering of steel is done to make it
brittle
hard
rollable
soft

Answer 339

soft

Question 340

Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its:
high strength to weight ratio.
low temperature strength properties.
its ability to be cast, rolled, forged & stamped.
high strength and corrosion & oxidation-resistance at elevated temperature.

Answer 340

high strength to weight ratio.

Question 341

Vessels made of __________ can be used to store dry chlorine.
thermoplastic materials
nickel
steel or iron
none of these

Answer 341

steel or iron

Question 342

For spinning viscose rayon, the extrusion spinnerettes are made of
platinum or gold alloys
high carbon steel
aluminium
nickel

Answer 342

platinum or gold alloys

Question 343

Alpha iron is stable __________ °C.
above 1403
up to 910
above 1800
between 910 & 1403

Answer 343

up to 910

Question 344

Babbit metal (used for making bearings) comprises of
mainly tin (85%) and lead.
saw dust and iron dust mixture.
zinc and aluminium.
copper and aluminium.

Answer 344

mainly tin (85%) and lead.

Question 345

Hydrochloric acid is stored in a __________ steel vessel.
lead lined
rubber lined
glass lined
stainless

Answer 345

rubber lined

Question 346

Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is ____.
used for making axle & shafts of aeroplanes, automobiles and locomotives.
having poor fatigue resistance.
having poor toughness.
not helpful in producing cleaner steel due to oxidising action of vanadium.

Answer 346

used for making axle & shafts of aeroplanes, automobiles and locomotives.

Question 347

Which of the following alloying elements is present in maximum percentage in high speed steel.
Molybdenum
Chromium
Tungsten
Vanadium

Answer 347

Tungsten

Question 348

Electronic structure of a material is generally studied by
metallurgical microscope
electron diffraction
spectroscopic techniques
X-ray

Answer 348

spectroscopic techniques

Question 349

Which of the following has the poorest wel-dability ?
Low carbon steel
Mild steel
Wrought iron
High-carbon steel

Answer 349

High-carbon steel

Question 350

Creep is not exhibited at low temperature by
rubber
acrylics
lead
plastics

Answer 350

lead

Question 351

Nickel and molybdenum are the basic constituents of
hastealloy
German silver
inconel
solder

Answer 351

hastealloy

Question 352

Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
beryllium
manganese
copper
iron

Answer 352

manganese

Question 353

A steel alloy containing 36% nickel is called __________ , which has a zero co-efficient of expansion.
austenitic stainless steel
heat resisting steel
invar
high speed steel

Answer 353

invar

Question 354

Which of the following is not used as the ceramic material in ‘cermets’ ?
Silicides
Oxides
Carbides
Nitrides

Answer 354

Nitrides

Question 355

Glass lined vessels are not used for handling/storing
dilute H2SO4
dilute HNO3
dilute HCl
hydroflouric acid

Answer 355

hydroflouric acid

Question 356

For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
stainless steel
cast iron
aluminium
nickel

Answer 356

cast iron

due to formation of protective layer when exposed to H2SO4

Question 357

Cast iron has:
high ductility.
high malleability.
very high tensile strength.
its elastic limit very close to ultimate breaking strength.

Answer 357

its elastic limit very close to ultimate breaking strength.

Question 358

Which of the following is not an alloy of tin?
White-bearing metal
Pewter type metal
Soft solder
German silver

Answer 358

German silver

Question 359

Which of the following is the easiest to bend?
Steel
Stainless steel
Cast iron
Wrought iron

Answer 359

Wrought iron

Question 360

Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
fully crystalline
partly crystalline
amorphous
none of these

Answer 360

partly crystalline

Question 361

In the kraft (sulphate) process for the paper manufacture, the digestor is made of
cast iron
stainless steel
karbate carbon
wrought iron

Answer 361

stainless steel

Question 362

Cast iron and steel pipes are produced by __________ casting.
die
investment
slush
true centrifugal

Answer 362

true centrifugal

Question 363

Cold worked steel parts are normally subjected to
normalising
hardening
annealing
shot peening

Answer 363

annealing

Question 364

Lead alone is not used in storing equipment, because it
is very costly.
corrodes easily.
is having low creep strength.
none of these.

Answer 364

is having low creep strength.

Question 365

H2SO4 (< 50% concentration) is corrosive to
aluminium, mild steel, stainless steel, concrete & tin.
copper, cast iron & high silicon iron (14% Si).
rubber (butyl and hard), silicone rubber & teflon.
glass, graphite, porcelain & stoneware.

Answer 365

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

Question 366

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

Answer 366

steel

Question 367

A bearing metal should not have
enough plasticity.
low thermal conductivity.
low co-efficient of friction.
high toughness.

Answer 367

low thermal conductivity.

Question 368

________ is not a case hardening process.
Carburising
Nitriding
Cyaniding
Annealing

Answer 368

Annealing

Question 369

Materials having __________ lattice structure are usually most ductile.
f.c.c.
b.c.c.
h.c.p.
cubic

Answer 369

f.c.c.

Question 370

Invar contains the highest percentage of:
vanadium
iron
tungsten
cobalt

Answer 370

iron

Question 371

Metalloid is
highly electronegative in nature.
an element which exhibits the properties of both metal & non-metal.
an alloy.
all (a), (b) and (c).

Answer 371

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

Question 372

The ability of a material to absorb energy in the elastic range is a measure of its
toughness
resilience
malleability
brittleness

Answer 372

resilience

Question 373

Phenol is not shipped in
nickel lined steel tank cars.
galvanised or tin lined drums.
boxed glass carboys.
cast iron containers.

Answer 373

cast iron containers.

Question 374

To improve the machinability of steel, it is generally subjected to
spheroidising
tempering
normalising
annealing

Answer 374

spheroidising

Question 375

Glass lined vessels are not used for handling
dilute H2SO4
dilute HNO3
dilute HCI
hydroflouric acid

Answer 375

hydroflouric acid

Question 376

Hardening of steel is not possible unless it is heated __________ critical point.
above the highest
above the lowest
between the first & second
between the second & third

Answer 376

above the lowest

Question 377

Hydrochloric acid absorber in made of
cast iron
mild steel
karbate
stainless steel

Answer 377

karbate

Question 378

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

Answer 378

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

Question 379

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

Answer 379

stainless steel

Question 380

Presence of silicon in steel ____.
is in the form of free Si.
indicates that steel is not deoxidised properly.
decreases the blow holes formation tendency in castings.
none of these.

Answer 380

decreases the blow holes formation tendency in castings.

Question 381

Pick the odd man out of the following.
Calorising
Pack carburising
Nitriding
Cyaniding

Answer 381

Calorising

Question 382

Cold work tool steel should have
high toughness
poor hardenability
high wear resistance
all (a), (b) & (c)

Answer 382

high wear resistance

Question 383

Aqueous nitric acid is stored in
steel drum
stainless steel vessel
cast iron vessel lined with acid-proof masonry brick
cast iron vessel

Answer 383

stainless steel vessel

Question 384

Addition of tungsten to steel imparts
magnetic properties
cutting hardness
corrosion resistance
ductility

Answer 384

cutting hardness

Question 385

Hot working of lead is carried out at
75° C
373° K
150° C
room temperature

Answer 385

room temperature

Question 386

Which of the following is a light alloy ?
Monel metal
Dow metal
German silver
Babbit metal

Answer 386

Dow metal

Question 387

Thermosetting resins are those polymers, which ___.
do not increase in plasticity with rise in temperature.
allow slip to occur between molecules.
do not take on a permanent set.
none of these.

Answer 387

do not increase in plasticity with rise in temperature.

Question 388

Ceramic materials
are exemplified by clay and mica.
are poor electrical conductors due to lack of free electrons.
never exhibit polymorphism.
all (a), (b) and (c).

Answer 388

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

Question 389

Light weight metallic alloy used in aircraft industry is
aluminium
high silicon (14%) iron
duralumin
phosphor bronze

Answer 389

duralumin

Question 390

Which of the following is an alloy of nickel and copper ?
Hastelloy
Duriron
Monel
Inconel

Answer 390

Monel

Question 391

Gunmetal and bronze are not corroded by the action of
wet chlorine.
synthetic detergent solution.
hydrochloric acid (10%).
nitric acid (< 25%).

Answer 391

synthetic detergent solution.

Question 392

Atmospheric corrosion of metals result from their
slow oxidation
fast oxidation
fast hydration
slow dehydration

Answer 392

slow oxidation

Question 393

To improve the machinability of steel by its softening, it is subjected to
cold working
annealing
shot blasting
heating

Answer 393

annealing

Question 394

Which one has the maximum tensile strength out of the following ?
Nodular cast iron
pig iron
white cast iron
grey cast iron

Answer 394

Nodular cast iron

Question 395

Material of construction of pipe generally used for conveying water in India is
stainless steel
cast iron
wrought iron
lead lined steel

Answer 395

cast iron

Question 396

Which of the following is the softest material ?
Quartz
Calcite
Corrundum
Flourite

Answer 396

Calcite

Question 397

Thermosetting polymers are
injection moulded
cast molded
extruded
none of these

Answer 397

cast molded

Question 398

Maximum consumption of lead is in the manufacture of ___.
storage batteries.
solder alloys.
electric cable sheathing.
lead lined vessels.

Answer 398

storage batteries.

Question 399

Clock pendulums are usually made of __________ steel.
high speed
stainless
heat resisting
none of these

Answer 399

none of these

Question 400

Which of the following is produced by addition polymerisation ?
Polybutadiene
Phenol formaldehyde
Urea-formaldehyde
Dacron

Answer 400

Polybutadiene

Question 401

With increase in the carbon percentage in the steel, its
hardness increases.
ductility reduces.
tensile strength increases.
all (a), (b) and (c)

Answer 401

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

Question 402

_________ is used for determining the tensile strength of steels.
Hydraulic press
Universal testing machine
Mechanical press
none of these

Answer 402

Universal testing machine

Question 403

Mild steel storage vessels are suitable for the storage of ___.
anhydrous ammonia
fatty acids
hydrochloric acid (95%)
sulphuric acid (25%)

Answer 403

anhydrous ammonia

Question 404

Mild steel is a/an __________ steel.
low carbon
medium carbon
high carbon
high alloy

Answer 404

low carbon

Question 405

Hardened steel is softened by
normalising
tempering
annealing
carburising

Answer 405

tempering

Question 406

Which of the following is not shipped in mild steel containers ?
Acetone
Ammonia
Ethyl alcohol
Formic acid

Answer 406

Formic acid

Question 407

Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
corrosion resistance
tensile strength
machinability
compressive strength

Answer 407

machinability

Question 408

Maximum consumption of copper is in
utensil manufacture.
electrical industry.
industrial equipment manufacture.
small scale industries.

Answer 408

electrical industry.

Question 409

Maximum carbon content in cast iron is __________ percent.
3.8
5.2
4.8
4.3

Answer 409

4.3

Question 410

Manganese in steel affects its
ductility
tensile strength
hardness
none of these

Answer 410

tensile strength

Question 411

Lead lined equipments & vessels are suitable for:
handling
hydrochloric acid (10%).
nitric acid.
sulphuric acid upto 60°C.
all (a), (b) and (c).

Answer 411

sulphuric acid upto 60°C.

Question 412

Carbon tetrachloride can be stored in a storage vessel made of ___.
high silicon iron (14% Si)
tin
stainless steel
all (a), (b) and (c)

Answer 412

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

Question 413

The process of coating steel sheets by zinc to improve its corrosion resistance is called:
calorising
galvanising
zincification
tempering

Answer 413

galvanising

Question 414

_________ does not contain copper as an alloying element,
Nichrome
Manganin
Perminivar
Monel metal

Answer 414

Nichrome

Question 415

Reactor used in the production of polyvinyl chloride (PVC) is made of
nickel or glass lined steel
aluminium
tantalum
lead

Answer 415

nickel or glass lined steel

Question 416

_________ is added in low carbon steel to raise its yield point.
Sulphur
Phosphorous
Silicon
Manganese

Answer 416

Manganese

Question 417

________ iron is produced, when molten pig iron is allowed to cool gradually.
White cast
Grey cast
Wrought
none of these

Answer 417

Grey cast

Question 418

Cast iron vessels are not suitable for the storage of
freon
H2SO4 (95%) at room temperature
H2SO4 (fuming)
wet SO2

Answer 418

wet SO2

Question 419

Condenser tubes are not made of
cartridge brass
muntz brass
wood metal
aluminium brass alloy

Answer 419

wood metal

Question 420

Tin in its pure form is used for making
cans for food packing.
collapsible tubes for toilet preparations.
foil for wrapping cheese.
all (a), (b) and (c).

Answer 420

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

Question 421

Addition of __________ in steel is helpful in increasing the depth of hardness.
chromium
sulphur
vanadium
tungsten

Answer 421

chromium

Question 422

Hydrochloric acid is stored in a__vessel.
lead lined steel
rubber lined steel
stainless steel
cast iron

Answer 422

rubber lined steel

Question 423

Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its ____.
high co-efficient of thermal expansion.
low thermal conductivity.
high corrosion resistance.
all (a), (b) and (c).

Answer 423

high corrosion resistance.

Question 424

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

Answer 424

Presence of silicon in steel decreases its electrical resistance.

Question 425

Ferric stainless steels compared to austenitic stainless steels
have lower corrosion resistance.
are harder to fabricate.
are less ductile and hence less suitable for cold pressing.
all (a), (b) and (c).

Answer 425

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

Question 426

Liners of a ball mill are never made of ___.
lead
alloy steel
rubber or ceramic material
cast iron

Answer 426

lead

Question 427

Most of the common metals have __________ crystal structure.
cubic
hexagonal
orthorhombic
none of these

Answer 427

cubic

Question 428

Cast iron is a __________ material.
brittle
ductile
tough
malleable

Answer 428

brittle

Question 429

Hydrocyanic acid is not shipped in
cast iron vessels.
steel cylinders.
aluminium containers.
monel drums.

Answer 429

cast iron vessels.

Question 430

Spark plugs are made of
high alumina ceramic
metallic carbides
corundum
carborundum

Answer 430

high alumina ceramic

Question 431

Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of ____.
aluminium
stainles steel
high silicon (14%) iron
copper

Answer 431

stainles steel

Question 432

Gas holder of a gobar (cowdung) gas plant is made of
molybdenum stainless steel
tin
mild steel
aluminium

Answer 432

mild steel

Question 433

A material capable of undergoing large permanent deformation, when subjected to tension is termed as
friable
ductile
brittle
none of these

Answer 433

ductile

Question 434

Bell metal is an alloy of
copper & zinc
copper & tin
copper & nickel
zinc & tin

Answer 434

copper & tin

Question 435

Mercury is transported in metal containers made of
aluminium
iron
lead
nickel

Answer 435

iron

Question 436

Lead pipe is ___.
especially resistant to solutions containing H2SO4.
usually joined by burning (e.g. by melting to adjacent pieces with a torch).
having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain.
all (a), (b) and (c).

Answer 436

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

Question 437

Inconel is an alloy of
tin, zinc and nickel
iron, nickel and chromium
copper and nickel
copper and tin

Answer 437

iron, nickel and chromium

Question 438

A measure of toughness of a material is its
percentage elongation
yield strength
ultimate strength
area under stress-strain diagram

Answer 438

yield strength

Question 439

Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of
cast iron
stainless steel or glass lined vessel
karbate
wrought iron

Answer 439

stainless steel or glass lined vessel

Question 440

Cast iron is having very high ___.
proximity between its elastic limit and ultimate breaking strength.
ductility.
tensile strength.
all (a), (b) and (c).

Answer 440

proximity between its elastic limit and ultimate breaking strength.

Question 441

The material of construction of bearings is
cast iron
babbit metal
pig iron
steel

Answer 441

babbit metal

Question 442

Wrought iron is a suitable material of construction for handling __________ solutions.
dilute acidic
concentrated acidic
alkalis & alkaline
none of these

Answer 442

alkalis & alkaline

Question 443

Hastelloy comprises of
copper and tin
copper and nickel
molybdenum and nickel
lead and tin

Answer 443

molybdenum and nickel

Question 444

Metalloid is:
an element, which exhibits the properties of both metal & non metal.
highly electronegative in nature.
an alloy.
all (a), (b) & (c)

Answer 444

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

Question 445

Stainless steel contains:
chromium and nickel
copper
aluminium
vanadium

Answer 445

chromium and nickel

Question 446

Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower ___.
price.
corrosion resistance.
thermal conductivity.
abundant availability.

Answer 446

abundant availability.

Question 447

Metal at the top of the electromotive series is:
least active
most stable
most active
most noble

Answer 447

most active

Question 448

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

Answer 448

fluctuating

Question 449

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 ___.
dilute HC1
acetic acid
concentrated H2SO4
none of these

Answer 449

acetic acid

Question 450

An alloy of iron containing 4% carbon is called
high carbon steel
wrought iron
mild steel
none of these

Answer 450

none of these

Question 451

Steel pipes are normally manufactured by __________ process.
extrusion
cold working
forging
electroforming

Answer 451

extrusion

Question 452

Polymorphism is not exhibited by __.
carbon
iron
phosphorous
none of these

Answer 452

none of these

Question 453

Rubber lined vessels are corroded by the action of ___.
aqua regia
chloroform
sulphuric acid (95%)
all (a), (b) and (c)

Answer 453

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

Question 454

_________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.
Solid solution hardening
Screw dislocation
Strain ageing
Twinning

Answer 454

Strain ageing

Question 455

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

Answer 455

Magnesium

Question 456

Brass container is suitable for storing
aqueous ammonia
beer
H2SO4(95%)
phosphoric acid (95%)

Answer 456

beer

Question 457

Aqueous nitric acid is stored in __________ vessel.
plain carbon steel
stainless steel
cast iron
thermosetting plastic material

Answer 457

cast iron

Question 458

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

Answer 458

mercury

Question 459

Graphite is corroded by
sulphuric acid (10%)
sea water
hydrochloric acid
none of these

Answer 459

none of these

Question 460

Carbon is present in the uncombined (graphitic) form in case of __.
cast iron
steel
ferroalloy
none of these

Answer 460

cast iron

Question 461

Among the tin containing alloys, __________ consumes the maximum amount of tin.
solder
white metal
pewter matal
bronzes

Answer 461

solder

Question 462

The hardest material just prior to diamond in Mhos scale is
topax
carborundum
corrundum
calcite

Answer 462

corrundum

Question 463

The damage/deterioration of metals by the __________ action of fluids is called ‘erosion’.
abrasive
corrosive
both (a) & (b)
neither (a) nor (b)

Answer 463

abrasive

Question 464

Cast iron compared to steel is better in
ductility
fluidity & castability
strength
malleability

Answer 464

fluidity & castability

Question 465

Plasticisers are added to polymers to improve their
tensile strength.
softness & flexibility.
acid resistance.
alkali resistance.

Answer 465

softness & flexibility.

Question 466

Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of ___.
stainless steel or glass lined steel
nickel clad steel
high silicon cast iron
aluminium

Answer 466

stainless steel or glass lined steel

Question 467

Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with ___.
acidic refractory
rubber
karbate
lead or acid proof bricks

Answer 467

acidic refractory

Question 468

The softest material in Mho’s scale (for measuring hardness) is
talc
gypsum
rubber
none of these

Answer 468

talc

Question 469

Monel metal is an alloy of
molybdenum and nickel.
nickel and copper.
molybdenum and aluminium.
molybdenum and zinc.

Answer 469

nickel and copper.

Question 470

German silver is an alloy of copper, nickel and
zinc
silver
tin
lead

Answer 470

zinc

Question 471

The presence of impurities in iron
increases its melting point.
does not affect its melting point.
decreases its melting point.
makes it malleable.

Answer 471

decreases its melting point.

Question 472

Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ?
Silicon steel
Chromium steel
Molybdenum steel
None of these

Answer 472

Silicon steel

Question 473

Which of the following is not an alloy of copper ?
Muntz metal
Admirability gun metal
German silver
Pewter metal

Answer 473

Pewter metal

Question 474

Which of the following is the most prone to atmospheric corrosion ?
Silver
Iron
Tin
Copper

Answer 474

Iron

Question 475

As the impurities are oxidised, the melting point of iron
decreases.
remains unchanged.
increases.
may increase or decrease ; unpredictable.

Answer 475

increases

Question 476

In a plate type heat exchanger, heat transfer plates are never made of
stainless steel
cast iron
titanium
hastealloy C

Answer 476

cast iron

Question 477

Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about
half
one third
one fifth
one twelfth

Answer 477

one fifth

Question 478

Ball bearings are generally made of
plain carbon steel
chrome carbon steel
stainless steel
malleable cast iron

Answer 478

chrome carbon steel

Question 479

Mild steel is a/an __________ steel.
low carbon
medium carbon
high carbon
high alloy

Answer 479

low carbon

Question 480

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

Answer 480

chiesels

Question 481

Which is the purest form of iron ?
Wrought iron
Pig iron
Bessemer iron
Grey iron

Answer 481

Wrought iron

Question 482

hite cast iron as compared to grey cast iron is
more durable
very brittle
very hard
all (a), (b) & (c)

Answer 482

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

Question 483

Combination of metals and ceramics are called
metalloy
cermets
pellets
non-crystalline ceramics

Answer 483

cermets

Question 484

_________ iron is produced, when molten pig iron is chilled suddenly.
White cast
Grey cast
Wrought
none of these

Answer 484

White cast

Question 485

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

Answer 485

Nickel

Question 486

Vycor, a widely used material for making ‘thermal wells’ in temperature measurement, is a
cermet
glass
thermosetting plastic
metallic alloy

Answer 486

glass

Question 487

‘Age hardening’ of duralumin is due to
copper
magnesium
both (a) & (b)
neither (a) nor (b)

Answer 487

both (a) & (b)

Question 488

_________ is a donor impurity for semi-conductors.
Boron
Antimony
Gallium
none of these

Answer 488

Antimony

Question 489

Post weld heat treatment is done by
normalising
stress relieving
tempering
solution annealing

Answer 489

stress relieving

Question 490

How many atoms are there per unit cell in a body centred cubic lattice system ?
2
3
4
6

Answer 490

2

Question 491

Presence of cobalt in steel improves its
cutting ability
corrosion resistance
tensile strength
none of these

Answer 491

cutting ability

Question 492

In cold working of metal as compared to its hot working ___.

cracks and blow holes are eliminated.
ductility and impact strength improves.
appreciable strain hardening is produced.
yield stress, hardness and fatigue strength is not at all affected.

Answer 492

appreciable strain hardening is produced.

Question 493

Nickel base alloys with __________ are known as monel metal.
zinc
tin
copper
molybdenum

Answer 493

copper

Question 494

Wrought iron is having very high
hardness.
strength.
corrosion resistance.
susceptibility to changes in its properties by heat treatment.

Answer 494

corrosion resistance.

Question 495

When iron is rusted, it is
converted to a fine powder
reduced
oxidised
none of these

Answer 495

oxidised

Question 496

Containers made of high silicon cast iron (14% Si) are not suitable for the storage of ___
acetic acid.
benzoic & boric acids.
phosphoric acid (95%) & sulphuric acid (95%).
hydrochloric acid (concentrated).

Answer 496

hydrochloric acid (concentrated).

Question 497

How many molecules per unit cell are there in a face centred cubic lettice ?
2
4
6
8

Answer 497

4

Question 498

Which of the following comprises of hydrocarbons ?
Mica flakes
Glass
Rubber
None of these

Answer 498

Rubber