Materials and Construction Flashcards
(499 cards)
1
Q
The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.
non-crystalline solid
crystalline
rubberry
non-crystalline organic polymeric.
A
non-crystalline organic polymeric.
2
Q
Coke oven regenerators are made of __________ bricks.
fire clay
silica
low thermal conductivity
high electrical conductivity
A
fire clay
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) ?
Invar
Constantan
Chromel
Alumel
A
Invar
4
Q
Shock resisting steels should possess high
hardness
toughness
tensile strength
wear resistance
A
toughness
5
Q
The purpose of nitriding the steel is to
harden its surface.
soften its surface.
improve its reliability.
none of these.
A
harden its surface.
6
Q
Ceramic recuperators are generally made of
silicon carbide.
calcium carbide.
fireclay bricks.
high alumina bricks.
A
silicon carbide.
7
Q
Hammers and railway rails are normally made of
mild steel
dead mild steel
medium carbon steel
high carbon steel
A
high carbon steel
8
Q
Softness of silver can be converted into hardness by alloying it with small quantity of
copper & nickel
zinc
aluminium
tin
A
copper & nickel
9
Q
The addition of antimony in tin-based alloys improves its
rupture strength and hot hardness.
impact strength and bonding strength.
deformation resistance.
wear resistance.
A
deformation resistance.
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 ?
Lead
Copper
Aluminium
Wrought iron
A
Lead
11
Q
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.
A
prevent the action of water.
12
Q
The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
0.2
2
4
8
A
4
13
Q
Invar used in thermocouples is an alloy of nickel and
iron
copper
chromium
lead
A
iron
14
Q
Nickel (56%) and molybdenum (17%) alloys are called
monel
hastealloy C
inconel
bronzes
A
hastealloy C
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
dilute HCI
acetic acid
concentrated H2SO4
none of these
A
acetic acid
16
Q
Constituents of stellite are
zinc, copper and nickel.
cobalt, chromium and tungsten.
zinc, aluminium and nickel.
nickel, cobalt and vanadium.
A
cobalt, chromium and tungsten.
17
Q
Residual magnetism in steel for magnets is increased by the addition of
nickel
cobalt
tungsten
chromium
A
cobalt
18
Q
Presence of nickel in steel improves its
corrosion resistance.
cutting ability.
wear resistance.
all (a), (b) and (c).
A
corrosion resistance.
19
Q
Cementite is
Fe3C chemically.
a compound of carbon and iron.
characterised by an orthorhombic crystal structure.
all (a), (b) and (c).
A
all (a), (b) and (c).
20
Q
Acetylene gas holder is made of
copper
cast iron
steel
monel metal
A
steel
21
Q
Sulphur melting pit in the sulphuric acid plant is made of
lead lined stainless steel.
cast iron.
steel or cement-brick lined.
hard wood.
A
steel or cement-brick lined.
22
Q
The hardest material just prior to diamond in Mho’s scale is
topax
carborundum
corrundum
calcite
A
corrundum
23
Q
Percentage elongation of a material is a measure of its
ductility
brittleness
toughness
malleability
A
ductility
24
Q
Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with
karbate
lead or glass
fireclay bricks
PVC
A
lead or glass
25
Heavy duty bearings are usually made of
white metal
phosphorous bronze
monel
zinc
white metal
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.
its capacity to withstand high voltage.
27
Which of the following stainless steels is non-magnetic ?
Ferritic
Martensitic
Austenitic
None of these
Austenitic
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
tungsten, chromium and vanadium
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.
rather low tensile strength.
30
Babbit metal used for bearings is a____base alloy.
tin
lead
aluminium
copper
tin
31
18/8 steel is a/an __________ stainless steel.
austenitic
ferritic
martensitic
none of these
austenitic
32
Cast iron has very high
compressive strength
ductility
shock resistance
resistance to brittleness
compressive strength
33
Liquid ammonia is shipped in __________ containers.
steel
aluminium
glass
lead lined
glass
34
Cermets are __________ materials.
refractory
reinforced
abrasive
fully metallic
refractory
35
Cast irons are generally specified by their
carbon content
tensile strength
hardness
manufacturing proces
tensile strength
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
12-14
37
White cast iron is not
malleable
whitish in color
brittle
strong and hard
malleable
38
Galvanised iron is
harder
protected from rusting
alumina coated iron
none of these
protected from rusting
39
German silver used for decorative purposes contains maximum percentage of
silver
copper
zinc
nickel
copper
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.
resist corrosion very strongly.
41
German silver in an alloy of
copper, nickel and zinc.
copper, aluminium and silver.
silver, zinc and aluminium.
silver, nickel and zinc.
copper, nickel and zinc.
42
A suitable material of construction to use with fuming sulphuric acid is
carbon steel
stainless steel type 304
nickel
monel
monel
43
Which of the following crystal structures characterises the austenitic stainless steel?
Simple hexagonal
Body centred cubic
Face centred cubic
None of these
Face centred cubic
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.
graphite and moving mercury.
45
Addition of __________ in steel can help in increasing the depth of hardness.
nickel
chromium
vanadium
tungsten
tungsten
46
Which of the following has the highest compressive strength ?
Wrought iron
Cast iron
Mild steel
High carbon steel
High carbon steel
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.
as an alloying element in various bronzes.
48
Refined acetic acid storage vessel are made of
copper
aluminium
high carbon steel
nickel
aluminium
49
Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
chromium
nickel
tungsten
cobalt
cobalt
50
Constantan is an alloy of
Cu (55%) & Sn (45%).
Cu (55%) & Ni (45%).
Pt (95%) & Rh (10%).
Fe (80%) & Ni (20%).
Cu (55%) & Ni (45%).
51
Babbit metals used for making bearings are
tin or lead based alloys.
short of antifrictional properties.
having homogenous microstructure.
yellow metals.
tin or lead based alloys.
52
Pipes for bi-cycle frames are made of __________ steel.
hot rolled
chrome carbon
cold rolled
stainless
cold rolled
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.
Brass, cast iron, mild steel and tin.
54
Interchain forces are the weakest in case of
plastics
fibres
elastomers
both rubber & elastomers
both rubber & elastomers
55
__________ possesses viscoelastic properties.
Cork
Glass
Graphite
Rubber
Rubber
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.
need not be lined.
57
Plastics are
used in very high temperature applications.
non-biodegradable.
not suitable for drainage pipe manufacture.
all (a), (b) & (c).
non-biodegradable.
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
rubber lined mild steel
59
Wood is corroded by
hydrochloric acid
SO2 (dry or wet)
chlorine (dry or wet)
all (a), (b) and (c)
all (a), (b) and (c)
60
Brass is an alloy of
nickel and tin
copper and zinc
tin and lead
copper, nickel and zinc
copper and zinc
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.
can not be work hardened.
62
Photographic plates are coated with
silver nitrate
silver halide
calcium silicate
metallic silver
silver halide
63
Cast iron has
very high tensile strenth.
high ductility.
high malleability.
elastic limit close to ultimate breaking strength.
elastic limit close to ultimate breaking strength.
64
Locomotive boiler tubes are made of __________ alloys.
arsenic copper
magnesium
aluminium
nickel
arsenic copper
65
Slow and progressive deformation of a material with time under constant stress is called
creep
erosion
resilience
none of these
creep
66
Which of the following heat treatment processes is used for softening the hardened material ?
Normalising
Tempering
Annealing
None of these
Tempering
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.
Modulus of elasticity (young's modulus).
68
Mercury is transported in metal containers made of
aluminium
iron
lead
nickel
iron
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
Stainless steel
70
Which of the following has the least carbon percentage ?
Low carbon steel
Mild steel
Wrought iron
White cast iron
Wrought iron
71
The range of Mho's scale of hardness is from
l to l5
l to 8
l to10
0 to 10
l to10
72
Which of the following pairs of elements may form an alloy ?
Iron & carbon
Iron & mercury
Platinum & mercury
None of these
Iron & carbon
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.
packed steel tower lined with acid proof bricks.
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
0.35 to 0.5
75
The preferred material of construction for storage tanks for 98% sulphuric acid is
aluminium
lead
stainless steel 316
mild steel
lead
76
The fermentor used for the production of ethyl alcohol from molasses is made of
wood
concrete
copper bearing steel
procelain
copper bearing steel
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.
offer no resistance to current flow.
78
Cermets are used for making
cutting tools
abrasives
both (a) & (b)
neither (a) nor (b)
both (a) & (b)
79
The formation of oxide film on a metal due to atmospheric exposure reduces its
toughness
stiffness
creep limit
all (a), (b) & (c)
creep limit
80
A hardened steel essentially contains
sorbite
troostite
martensite
none of these
martensite
81
Which one contains the least percentage of carbon ?
Wrought iron
High speed steel
Cast iron
Pig iron
Wrought iron
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
steel
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.
increases very quickly.
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.
are used for leaf and coiled springs.
85
Which of the following is not a copper based alloy with nickel ?
German silver
Monel metal
Inconel
Constantan
Inconel
86
Which of the following alloys does not contain nickel ?
Chlorinet - 2 alloy
Monel
Inconel
Babbit metal
Babbit metal
87
An elastic behaviour of materials is expressed in terms of
hysterisis loop area
stress-strain curve
relaxation time
none of these
relaxation time
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.
ferromagnetic at room temperature.
89
In drop forging process, the forging is done by dropping the __________ at high velocity.
hammer
workpiece.
die with hammer
weight on hammer
die with hammer
90
Which of the following is not an alloy of copper and tin ?
Bell metal
Gun metal
Admiralty gun metal
Monel metal
Monel metal
91
__________ is never shipped in glass carboys.
Ammonia
Acetic acid
Phenol
Formaldehyde
Ammonia
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.
used as a shock absorber (in mattress form) between the foundation and steel framework of skyscrapper buildings.
93
Nitriding of steel is done (in electric furnace) at __________ °C.
510
1720
2210
910
510
94
Addition of 2% nickel in steel makes it suitable for making
electronic valves
boiler plates, rivets etc.
turbine blades
connecting rod
boiler plates, rivets etc.
95
The softest material just next to talc in the Mhos scale is
quartz
gypsum
feldspar
fluorite
gypsum
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
under stressing the specimen
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
High silicon iron, Kel-F and teflon
98
Aluminium storage vessel can be used to store
aqua regia
ferrous sulphate
hydrochloric acid (10%)
none of these
none of these
99
Which metal is protected by the layer of its own oxide ?
Iron
Silver
Calcium
Aluminium
Aluminium
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
endurance limit
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.
an intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide).
102
Wrought iron is a suitable material of construction for handling __________ solutions.
dilute acidic
concentrated acidic
alkalis & alkaline
none of these
alkalis & alkaline
103
Steel rods are used in reinforced concrete to increase its __________ strength.
shear
tensile
compressive
none of these
tensile
104
Corrosion involves exchange of electrons in __________ corrosion.
chemical
electrochemical
both (a) & (b)
neither (a) nor (b)
both (a) & (b)
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.
High frequency transformers.
106
Which of the following has the least value of ultimate tensile strength (UTS) ?
Medium carbon steel
High carbon steel
Cast iron
Wrought iron
Cast iron
107
__________ does not contain tin as an alloying material.
Brass
Pewter
Solder
Babbit metal
Brass
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.
more corrosion resistant.
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.
Wrought iron can not be easily forged and welded.
110
The increase in hardness of metal due to its cold working is termed as the __________ hardening.
work
age
induction
flame
work
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)
reinforced concrete lined with lead
112
Bearings subjected to light load are made of
white metal
phosphorous bronze
monel
silicon bronze
phosphorous bronze
113
Softening of hardned steel is done by its
normalising
tempering
annealing
carburising
tempering
114
Maximum permissible sulphur content in steel is __________ percent.
0.015
0.055
0.505
0.805
0.055
115
Ceramic materials fabrication can not be done by
welding
slip casting
extrusion
plastic pressing
welding
116
Which has the maximum melting point out of the following ?
Steel
Cast iron
Stainless steel
Wrought iron
Wrought iron
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)
all (a), (b) & (c)
118
Which of the following has no effect on the carbide forming tendency in steels ?
Molybdenum
Phosphorus
Chromium
Vanadium
Phosphorus
119
Approximate value of the modulus of elasticity for steel is about __________ x l06kg/cm2.
0.5
2
40
75
2
120
Carbon is present in steel wholly in the
combined form.
free state as graphite.
both (a) and (b).
neither (a) nor (b).
combined form.
121
Carbon supply in pack carburising process is in the form of
charcoal
calcium carbide
hydrocarbon oil
graphite
charcoal
122
In SO3 absorber (Contact Process), packing material used is of
cast iron
chemical stoneware
karbate
mild steel
chemical stoneware
123
Presence of manganese in alloy steel improves its
corrosion resistance.
cutting ability.
abrasion resistance & toughness.
elasticity & creep resistance.
abrasion resistance & toughness.
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
lead or acid-proof bricks
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.
drawn into wires.
126
A chemical change takes place when iron
rusts
melts
is heated
none of these
rusts
127
Evaporator used for concentrating tomato juice is made of
nickel
brass
stainless steel-glass lined
cast iron-rubber lined
stainless steel-glass lined
128
High carbon steel contains more than __________ percent carbon.
0.5
2.2
2.5
2.8
0.5
129
The main constituent of carborundum is __________ carbide.
calcium
silicon
boron
aluminium
silicon
130
For storing water and acid free benzol, use a __________ vessel.
steel
karbate
stainless steel
none of these
steel
131
The chlorinator used in the manufacture of DDT is made of
glass
glass lined steel
teflon
bakelite
glass lined steel
132
Reduction in the grain size reduces the __________ of the material.
fatigue resistance
tensile strength
creep resistance
all (a), (b) & (c)
creep resistance
133
Age hardening is concerned with
copper
brass
duralumin
silver
duralumin
134
Which of the following undergoes granular fracture ?
Wrought iron
Steel
Cast iron
None of these
Steel
135
Ball bearings are normally made of __________ steel.
high speed
high carbon
chrome
silicon
chrome
136
The electrical conductivity of a __________ decreases with rise in temperature.
metal/alloy
semi-conductor
dielectric
none of these
metal/alloy
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)
Noble metals (Ag, Pt, Au)
138
Addition of nickel to copper improves its
machinability
ductility
strength
hardness
hardness
139
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
oxygen
arsenic
antimony
bismuth
bismuth
140
High speed cutting tool steels contain about __________ percent of tungsten.
6-8
18-20
30-35
50-55
18-20
141
The 'bomb' in the bomb calorimeter is made of
molybdenum stainless steel
mild steel
high silicon iron (14% Si)
copper
molybdenum stainless steel
142
Which of the following is produced by condensation polymerisation ?
Bakelite
Polythene
Poly vinyl chloride
Polystyrene
Bakelite
143
The crystal structure of most of the common metals is
orthorhombic
cubic
hexagonal
none of these
cubic
144
Telfon (PTFE) is corroded by
hydrochloric acid (10%)
hydrochloric acid (95%)
sulphuric acid
none of these
none of these
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.
light and resists attack by acids.
146
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
copper
cast iron
aluminium
high carbon steel
cast iron
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.
Bauschinger effect.
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.
Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making.
149
The specific gravity of coal depends mainly on its __________ content.
carbon
volatile matter
ash
moisture
ash
150
Carbon percentage is the same in cast iron and
wrought iron
pig iron
mild steel
high silicon (14%) iron
pig iron
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.
The ability of a material to fracture without appreciable deformation is called its ductility.
152
Which of the following has the highest density and the lowest melting point ?
Stainless steel
Titanium
Lead
Aluminium
Lead
153
In order to be called steel, an alloy should have iron percentage greater than
80
70
90
50
80
154
Nickel is a constituent of
bronze
solder
duralumin
monel metal
monel metal
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
steel with top section nickel clad or stainless
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).
fruit juices, milk & its products and caustic soda solution.
157
Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
nickel
copper
stainless steel
brass
copper
158
In hot wire aneomometer used for gas flow measurement, the wire is normally made of
copper
platinum
constantan
chromium
platinum
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
normalising
160
Mild steel is used for making
fish plates
die block
channels
drop forging
channels
161
Presence of 0.3 to 0.5% arsenic in copper increases its
ductility
malleability
tenacity & hardness
electrical conductivity
tenacity & hardness
162
The heat treatment process applied to cold formed steel parts is
normalising
tempering
artificial ageing
solution annealing
solution annealing
163
The largest consumption of zinc for alloys is in the making of
bearing metal
brasses
brazing solder
die casting alloys
brasses
164
Plate and frame filter press is usually made of
mild steel
cast iron
stainless steel
galvanised iron
cast iron
165
Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
plain carbon steel
stainless steel
rubber or durmet-20 lined
lead
rubber or durmet-20 lined
166
Nickel and copper are the basic constituents of
hastelloy
monel metal
German silver
inconel
monel metal
167
Copper has very low
malleability
ductility
tensile strength
thermal & electrical conductivity
tensile strength
168
Hardest material so far found is
diamond
graphite
carborundum
pumice stone
diamond
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)
aluminium or chromium alloys (Cr > 18% for cold acid)
170
The most resistant material to alkaline corrosion is
duriron
nickel
aluminium
karbate
nickel
171
Tin coating is not done by
vaporising
hot dipping
electro deposition
spraying
vaporising
172
Stainless steel is not corroded by
hydrochloric acid (10%).
nitric acid (10%).
sulphuric acid (10%).
saturated brine.
nitric acid (10%).
173
__________ is added in stainless steel to prevent inter crystal corrosion.
Vanadium
Niobium
Chromium
Nickel
Niobium
174
Nickel is a __________ material.
ferromagnetic
diamagnetic
paramagnetic
none of these
ferromagnetic
175
Babbit metal is not a
tin base alloy
white metal
lead base alloy
pure metal
pure metal
176
Which of the following alloys does not contain nickel ?
Chloro, et-2 alloy
Monel
Inconel
Babbit metal
Babbit metal
177
Which of the following is the lightest of engineering metals ?
Magnesium
Aluminium
Titanium
Tin
Magnesium
178
Evaporators used in caustic soda recovery and production plant are made of
monel metal
gun metal
wood metal
babbit metal
monel metal
179
With increase in carbide/graphite ratio in cast iron, its
hardness & brittleness increases.
ductility decreases.
both (a) and (b).
neither (a) nor (b).
both (a) and (b).
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
glass lined steel
181
Nickel (76%) and chromium (15%) alloys are termed as
inconel
monel
aluminium bronzes
brass
inconel
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
0.1 to 0.35
183
White metal is an alloy of
lead, tin and cadmium
copper, tin and zinc
copper and lead
none of these
none of these
184
The carbonating tower used in Solvay process of soda ash manufacture is made of
cast iron
stainless steel
karbate
lead lined steel
cast iron
185
For platinum thermocouples, lead wires are made of
copper & copper-nickel alloys.
copper & iron.
iron & nickel.
tin & nickel.
copper & copper-nickel alloys.
186
High resistance electrical heating elements/wire are not made of
marageing steel
nimonic alloys
kanthal wire
nichrome
marageing steel
187
Cast irons are generally specified by their
carbon percentage
tensile strength
hardness
iron percentage
tensile strength
188
Which one is remelted and poured into moulds to get cast iron ?
Wrought iron
Pig iron
Low carbon steel
Mild steel
Pig iron
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.
storage tank for storing brine and caustic soda.
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
monel
191
Which of the following is the hardest ?
Cementite
Pearlite
Austenite
Ferrite
Austenite
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
Nickel-chrome steel
193
The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
precipitation
fusion
sintering
agglomeration
sintering
194
Sulphuric acid pickling tanks are lined with
nickel
rubber
aluminium
glass
rubber
195
Valves in pipe size of 2" and under are normally made of
wrought iron
brass
bronze
monel
brass
196
Ceramic materials are
organic in nature.
stronger in compression than in tension
always amorphous in nature.
always bad heat conductors.
stronger in compression than in tension
197
Which is an amorphous material ?
Glass
Mica
Brass
Cast iron
Glass
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
cast iron
199
Platinum and silver are corroded by
caustic soda solution
phosphoric acid
sulphuric acid (10%)
none of these
none of these
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
tin, nickel, iron and chromium
200
The material used in the filament of electric bulbs is:
nichrome
tungsten
constantan
German silver
tungsten
201
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
shafts
flanges
gears
shear blades
flanges
202
Caustic soda can be stored in __________ drums.
steel
cast iron
brass
gun metal
steel
203
Work hardening of a material
decreases its tensile strength.
decreases its ductility.
increases its ductility.
does not affect its ductility.
decreases its ductility.
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.
malleable & ductile; and hence is used for chain links, hooks & couplings.
205
Perspex is nothing but
acrylic sheet
an elastomer
an alloy of lead and tin
aluminium foil clad with bakelite
acrylic sheet
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.
alkaline solutions.
207
Ability of a material to __________ is indicated by its damping capacity.
withstand compression
absorb vibration
absorb shock
none of these
absorb vibration
208
Corrosion resistance of steel is increased by the addition of
phosphorous and tungsten.
nickel and chromium.
lead and vanadium.
molybdenum and tungsten.
nickel and chromium.
209
Hydrochloric acid is __________ corrosive to common metals.
least
not
mildly
highly
highly
210
Tank furnace used for melting of glass is made of
mild steel
cast iron
refractory blocks
stainless steel
refractory blocks
211
Spray dryer for evaporating milk to produce milk powder is made of
lead lined steel
stainless steel
aluminium
cast iron
stainless steel
212
Chromel (Nichrome) is an alloy of
chromium and molybdenum.
nickel and chromium.
molybdenum and nickel.
chromium and aluminium.
nickel and chromium.
213
Which of the following is not an alloy of nickel and chromium ?
Inconel
Hastealloy
Nimonic alloys
Duralumin
Duralumin
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.
easily deform under pressure at high temperature.
215
The temperature at which new grains are formed in the metal is called the __________ temperature.
eutectic
recrystallisation
upper critical
lower critical
recrystallisation
216
Molten phthalic anhydride is stored in a/an __________ vessel.
aluminium
nickel clad steel
lead lined steel
glass lined steel.
aluminium
217
Fatigue failure of a material results from __________ stress.
tensile
compressive
fluctuating
none of these.
fluctuating
218
Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel
rubber
monel
glass
nickel
glass
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.
Tungsten has a body centred cubic (bcc) crystal lattice structure.
220
Ability of a material to absorb energy in deformation in the plastic range is characterised as its:
ductility
toughness
creep
resilience
toughness
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.
used for making steam valves and turbine blades as it resists steam attack at high temperature.
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.
are used for automobile parts like gears, axle, shaft, bearings etc.
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).
all (a), (b) and (c).
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.
increases the formation of graphite.
225
Rubber lined pumps can be used to pump:
caustic soda
chlorinated brine
hypochlorous acid
all (a), (b) and (c)
all (a), (b) and (c)
226
Titanium metal
exists in three allotropic forms.
can not be welded.
is used in oceanographic and space exploration applications.
none of these.
is used in oceanographic and space exploration applications.
227
Purity of electrical grade aluminium should be ≥ __________ percent.
95
99.5
85
90
99.5
228
Maximum consumption of zinc is in
alloying
galvanising
utensil manufacture
electrical industry
galvanising
229
Hardest materials so far found is
diamond
graphite
carborundum
pumice stone
diamond
230
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as:
sheradising
parkerising
anodising
none of these
sheradising
231
Which of the following commercial metals is most abundantly found in India ?
Copper
Aluminium
Nickel
Zinc
Aluminium
232
Tin vessels are corroded by
anhydrous ammonia
aromatic solvents
synthetic detergent solution
none of these
none of these
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).
dry chlorine & dry fluorine.
234
Tempering of steel is done to make it
brittle
hard
rollable
soft
soft
235
Concrete tank can be used to store
alum
ferrous sulphate
sulphuric acid
saturated brine
saturated brine
236
Zinc is highly __________ at room temperature.
ductile
resistant to atmospheric corrosion
malleable
brittle
resistant to atmospheric corrosion
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
Silicon
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.
16-13% Cr 10-14% Ni and 2-3% Mo.
239
Sheardising process is used for:
surface coating.
heat treatment of high speed steel.
cold working on metals.
none of these.
surface coating.
240
The maximum percentage of chromium that can be added to steel is about
12
18
24
30
18
241
Which of the following is a non-magnetic material ?
Cobalt
Zinc
Nickel
None of these
Zinc
242
An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
constantan
kanthal
chromel
German silver
constantan
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
cast iron
244
Rotary driers are generally made of
cast iron
mild steel
high silicon iron (14% Si)
tin lined with refractory bricks
mild steel
245
Presence of high phosphorous in cast iron increases its
fluidity
melting point
shrinkage
tensile strength
fluidity
246
The phenomenon in which slow extension of material takes place with the time at constant load is called
plasticity
creep
elasticity
ductility
creep
247
A material capable of undergoing large permanent deformation, when subjected to compression is termed as
malleable
ductile
brittle
none of these
malleable
248
_________ is used for examining the macro-structure of a material.
Metallurgical microscope
Optical microscope
X-rays
Visual inspection by naked eye
Visual inspection by naked eye
249
High speed steel tools retain their hardness upto a temperature of __________ °C.
500
750
900
1100
900
250
Dry chlorine can be handled in a vessel made of
iron or steel
PVC
nickel
brass
iron or steel
251
Brine solution is stored/treated in __________ lined vessels/pipes.
rubber
lead
glass
nickel
nickel
252
Steel balls for ball bearings are generally made of __________ steel.
cast
stainless
free carbon
carbon chrome
carbon chrome
253
Beehive coke ovens are made of __________ bricks.
silica
fireclay
silicon carbide
corundum
silica
254
Muntz metal is a/an alloys of
magnesium & tin
ferrous material
lead & tin
copper & zinc
copper & zinc
255
Rotary kilns in cement industry are lined with____bricks.
fireclay
silica
lead
high alumina & high magnesia
high alumina & high magnesia
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
0.2
257
Which of the following will have the highest melting point ?
Pig iron
Mild steel
Wrought iron
High carbon steel
Wrought iron
258
Galvanising is generally done on
non-ferrous metals
low carbon steel
stainless steel
cast iron
low carbon steel
259
Carbon is present in the combined form (carbide) in case of
pig iron
steel
ferroalloys
all (a), (b) & (c)
all (a), (b) & (c)
260
Chilled iron castings are
easily machinable
soft on surface
highly wear resistant
none of these
highly wear resistant
261
A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.
5
100
250
500
5
262
Presence of nitrogen in steel
makes it brittle.
increases its strength.
increases its hardness.
is desirable.
makes it brittle.
263
Very high sulphur in pig iron makes
its casting unsound.
its hard and machinable.
its brittle and malleable.
all (a), (b) & (c)
its casting unsound.
264
Amount of energy that a material can absorb before its fracture is a measure of its:
toughness
resilience
malleability
ductility
toughness
265
Anodic material used for the cathodic protection of underground buried steel pipeline is
nickel or copper
zinc or magnesium
bronze
brass
zinc or magnesium
266
Bush bearings are made of
mild steel
phosphorous bronze
white metal alloys
none of these
phosphorous bronze
267
Alinco, which is a aluminium-cobalt-nickel steel, is used for making
surgical instruments
powerful magnets
chemical equipments
boiler tubes
powerful magnets
268
Slow plastic deformation of metals under a constant stress is termed as __________ failure.
fatigue
endurance
creep
none of these
creep
269
Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of:
tungsten
vanadium
silicon
all (a), (b) & (c)
silicon
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).
all (a), (b) and (c).
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.
Hardening of a soft metal can be done by alloying it with another metal or non-metal.
272
Cast iron detachable joint is used in __________ pipes.
steel
cast iron
asbestos cement
reinforced cement concrete
steel
273
Tin coating on metals is not done by:
spraying
powder metallurgy
hot dipping
electro-deposition
powder metallurgy
274
The softest material just next to talc in the Mho's scale is
quartz
gypsum
feldspar
fluorite
gypsum
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.
18% chromium and 8% nickel.
276
Glass is corroded by
fluorine (dry or wet)
sulphuric acid
phosphoric acid
none of these
fluorine (dry or wet)
277
Iron alloyed with carbon upto 2% is called
pig iron
wrought iron
high carbon steel
none of these
none of these
278
Which of the following is a low melting point metal ?
Stainless steel
Wrought iron
Tin
Copper
Tin
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.
Cold working of a metal decreases its fatigue strength.
280
Which of the following finds the least commercial use ?
Pure iron
High silicon iron
Low carbon steel
High carbon steel
Pure iron
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
Glass wool and 85% magnesia
282
Silicon percentage in iron castings to have maximum hardness should be about
0.3
0.5
0.8
2.5
0.8
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.
is used as an alloying element for both ferrous & non-ferrous alloys.
284
__________ moulding process can not be used for thermoplastic plastics.
Compression
Extrusion
Injection
None of these
Injection
285
Which of the following crystal structures characterises the ferritic stainless steel ?
Face centred cubic
Body centred cubic
Simple hexagonal
None of these
Body centred cubic
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).
both (a) and (b).
287
Gun metal is an alloy of
nickel, tin and copper
copper, tin and zinc
copper, phosphorus and nickel
manganese, phosphorus and nickel
copper, tin and zinc
288
Carbon content in steel is __________ percent.
0.1-2
4-6
2-4
0.001-0.01
0.1-2
289
Nitriding of steel is a process for:
case hardening
spheroidising
normalising
annealing
case hardening
290
Which of the following has a very high carbide forming tendency in steels ?
Silicon
Chromium
Nickel
Vanadium
Vanadium
291
The most distinguished property of malleable cast iron is its high:
ductility
hardness
malleability
none of these
ductility
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
proof
293
Which of the following is the hardest material ?
Topaz
Quartz
Corrundum
Flourite
Corrundum
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.
High silicon iron, silicon rubber, Kel-F and teflon.
295
Biological shield in a nuclear power reactor is made of:
concrete
steel
cadmium
zircalloy
concrete
296
Acid proof stoneware
has very low strength.
cannot be heated.
is broken by small temperature changes.
all (a), (b) and (c).
all (a), (b) and (c).
297
Diamagnetic materials are magnetised
strongly.
only slightly.
with eddy currents only.
in a direction opposite to that of the applied field.
in a direction opposite to that of the applied field.
298
High degree of toughness is a must for
high speed steel
shock resisting steel
cold work tool steel
none of these
shock resisting steel
299
'Hypersil' is a __________ steel.
high speed
silicon
molybdenum
tungsten
silicon
300
_________ can replace tungsten in high speed steel,
Chromium
Vanadium
Cobalt
Molybdenum
Molybdenum
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.
sulphuric acid (10%) at room temperature.
302
Bronze is an alloy of copper and
lead
tin
nickel
zinc
tin
303
Which of the following exercises most powerful influence on the mechanical properties of steel ?
Manganese
Carbon
Phosphorous
Silicon
Carbon
304
Percentage of silver in German silver is
5
10
20
0
0
305
Balls in a ball mill are usually made of
steel
cast iron
stainless steel
bronze
steel
306
Constantan used in thermocouples is an alloy of
iron & copper
copper & aluminium
lead & tin
none of these
none of these
307
A material is able to retain the deformation permanently by virtue of its
elasticity
plasticity
ductility
malleability
plasticity
308
__________ steel is widely used for the manufacture of motor car crankshafts.
Silicon
Nickel
Chrome
High speed
Chrome
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).
both(a) & (b).
310
Which of the following is not a nickel based alloy ?
Inconel
Hastelloys
Nimonics
Babbit metal
Babbit metal
311
Coke oven walls are lined with __________ bricks.
silica
tar-dolomite
low thermal conductivity
fire clay
silica
312
Iron rust is:
ferrous oxide.
hydrated ferric oxide.
powdered iron.
ferric sulphide.
hydrated ferric oxide.
313
Urea autoclave is made of
cast iron
refractory blocks
stainless steel
lead lined steel
stainless steel
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.
a low carbon steel (0.05 to 0.3% carbon).
315
Dilute sulphuric acid is transported in __________ pipes.
mild steel
lead
copper
special alloys
lead
316
__________ alloys have the highest specific strength of all the structural materials out of the following.
Magnetic steel
Titanium
Chromium
Magnesium
Titanium
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.
aluminium, tin and rubber.
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
0.35 to 0.45
319
Duralumin is an alloy of
aluminium, copper and manganese.
aluminium, nickel and silicon.
aluminium and nickel.
none of these.
aluminium, copper and manganese.
320
Silicon percentage in acid resistant cast iron is about
4
8
14
20
14
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.
PTFE and porcelain.
322
Which of the following stainless steels is non-magnetic ?
Ferritic
Martensitic
Austenitic
None of these
Austenitic
323
A magnetic material becomes __________ above the Curie temperature.
ferromagnetic
diamagnetic
paramagnetic
none of these
paramagnetic
324
Which of the following is not a non-ferrous alloy ?
Meehanite
Magnalium
Gun metal
Muntz metal
Meehanite
325
Which of the following is the most elastic material ?
Plastic
Glass
Steel
Rubber
Steel
326
Water gas generator is made of
carbon steel-brick lined
stainless steel-lead lined
cast iron
high carbon steel-procelain lined
carbon steel-brick lined
327
The digester of a Gobar gas plant is a
mild steel drum
stainless steel vessel
masonry well
cast iron vessel
masonry well
328
The ability of a material to offer resistance to scratching or indentation is a measure of its
brittleness
toughness
hardness
resilience
hardness
329
Brine (15% concentration) can be stored in a vessel made of
monel
karbate
cast iron
none of these
monel
330
Generally __________ are subjected to galvanising (i.e., zinc coating).
non-ferrous metals
non-metals
low carbon steels
stainless steel
low carbon steels
331
A material no longer behaves elastically beyond
plastic limit
limiting load
elastic limit
breaking load
elastic limit
332
When the steel is subjected to normalising, its __________ decreases.
yield point
ductility
ultimate tensile strength (UTS)
none of these
ductility
333
The most commonly used resin for making reinforced plastic is
unsaturated polyester
polypropylene
polyurathane
nylon-6
unsaturated polyester
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).
molybdenum stainless steel.
335
Brinell Hardness Number (BHN) for talc is approximately in the range of
1-5
20-30
100 -150
200 - 250
20-30
336
Dies for wire drawing are generally made of
mild steel
stainless steel
carbides
high carbon steel
carbides
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
brass
338
Which of the following contains maximum percentage of carbon ?
Boiler plate steel
Rail steel
Saws for cutting steel
Railway spring steel
Saws for cutting steel
339
Tempering of steel is done to make it
brittle
hard
rollable
soft
soft
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.
high strength to weight ratio.
341
Vessels made of __________ can be used to store dry chlorine.
thermoplastic materials
nickel
steel or iron
none of these
steel or iron
342
For spinning viscose rayon, the extrusion spinnerettes are made of
platinum or gold alloys
high carbon steel
aluminium
nickel
platinum or gold alloys
343
Alpha iron is stable __________ °C.
above 1403
up to 910
above 1800
between 910 & 1403
up to 910
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.
mainly tin (85%) and lead.
345
Hydrochloric acid is stored in a __________ steel vessel.
lead lined
rubber lined
glass lined
stainless
rubber lined
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.
used for making axle & shafts of aeroplanes, automobiles and locomotives.
347
Which of the following alloying elements is present in maximum percentage in high speed steel.
Molybdenum
Chromium
Tungsten
Vanadium
Tungsten
348
Electronic structure of a material is generally studied by
metallurgical microscope
electron diffraction
spectroscopic techniques
X-ray
spectroscopic techniques
349
Which of the following has the poorest wel-dability ?
Low carbon steel
Mild steel
Wrought iron
High-carbon steel
High-carbon steel
350
Creep is not exhibited at low temperature by
rubber
acrylics
lead
plastics
lead
351
Nickel and molybdenum are the basic constituents of
hastealloy
German silver
inconel
solder
hastealloy
352
Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
beryllium
manganese
copper
iron
manganese
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
invar
354
Which of the following is not used as the ceramic material in 'cermets' ?
Silicides
Oxides
Carbides
Nitrides
Nitrides
355
Glass lined vessels are not used for handling/storing
dilute H2SO4
dilute HNO3
dilute HCl
hydroflouric acid
hydroflouric acid
356
For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
stainless steel
cast iron
aluminium
nickel
cast iron
due to formation of protective layer when exposed to H2SO4
357
Cast iron has:
high ductility.
high malleability.
very high tensile strength.
its elastic limit very close to ultimate breaking strength.
its elastic limit very close to ultimate breaking strength.
358
Which of the following is not an alloy of tin?
White-bearing metal
Pewter type metal
Soft solder
German silver
German silver
359
Which of the following is the easiest to bend?
Steel
Stainless steel
Cast iron
Wrought iron
Wrought iron
360
Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
fully crystalline
partly crystalline
amorphous
none of these
partly crystalline
361
In the kraft (sulphate) process for the paper manufacture, the digestor is made of
cast iron
stainless steel
karbate carbon
wrought iron
stainless steel
362
Cast iron and steel pipes are produced by __________ casting.
die
investment
slush
true centrifugal
true centrifugal
363
Cold worked steel parts are normally subjected to
normalising
hardening
annealing
shot peening
annealing
364
Lead alone is not used in storing equipment, because it
is very costly.
corrodes easily.
is having low creep strength.
none of these.
is having low creep strength.
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.
aluminium, mild steel, stainless steel, concrete & tin.
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
steel
367
A bearing metal should not have
enough plasticity.
low thermal conductivity.
low co-efficient of friction.
high toughness.
low thermal conductivity.
368
________ is not a case hardening process.
Carburising
Nitriding
Cyaniding
Annealing
Annealing
369
Materials having __________ lattice structure are usually most ductile.
f.c.c.
b.c.c.
h.c.p.
cubic
f.c.c.
370
Invar contains the highest percentage of:
vanadium
iron
tungsten
cobalt
iron
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).
an element which exhibits the properties of both metal & non-metal.
372
The ability of a material to absorb energy in the elastic range is a measure of its
toughness
resilience
malleability
brittleness
resilience
373
Phenol is not shipped in
nickel lined steel tank cars.
galvanised or tin lined drums.
boxed glass carboys.
cast iron containers.
cast iron containers.
374
To improve the machinability of steel, it is generally subjected to
spheroidising
tempering
normalising
annealing
spheroidising
375
Glass lined vessels are not used for handling
dilute H2SO4
dilute HNO3
dilute HCI
hydroflouric acid
hydroflouric acid
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
above the lowest
377
Hydrochloric acid absorber in made of
cast iron
mild steel
karbate
stainless steel
karbate
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.
Tin can be readily and very easily drawn into very fine wire.
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
stainless steel
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.
decreases the blow holes formation tendency in castings.
381
Pick the odd man out of the following.
Calorising
Pack carburising
Nitriding
Cyaniding
Calorising
382
Cold work tool steel should have
high toughness
poor hardenability
high wear resistance
all (a), (b) & (c)
high wear resistance
383
Aqueous nitric acid is stored in
steel drum
stainless steel vessel
cast iron vessel lined with acid-proof masonry brick
cast iron vessel
stainless steel vessel
384
Addition of tungsten to steel imparts
magnetic properties
cutting hardness
corrosion resistance
ductility
cutting hardness
385
Hot working of lead is carried out at
75° C
373° K
150° C
room temperature
room temperature
386
Which of the following is a light alloy ?
Monel metal
Dow metal
German silver
Babbit metal
Dow metal
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.
do not increase in plasticity with rise in temperature.
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).
all (a), (b) and (c).
389
Light weight metallic alloy used in aircraft industry is
aluminium
high silicon (14%) iron
duralumin
phosphor bronze
duralumin
390
Which of the following is an alloy of nickel and copper ?
Hastelloy
Duriron
Monel
Inconel
Monel
391
Gunmetal and bronze are not corroded by the action of
wet chlorine.
synthetic detergent solution.
hydrochloric acid (10%).
nitric acid (< 25%).
synthetic detergent solution.
392
Atmospheric corrosion of metals result from their
slow oxidation
fast oxidation
fast hydration
slow dehydration
slow oxidation
393
To improve the machinability of steel by its softening, it is subjected to
cold working
annealing
shot blasting
heating
annealing
394
Which one has the maximum tensile strength out of the following ?
Nodular cast iron
pig iron
white cast iron
grey cast iron
Nodular cast iron
395
Material of construction of pipe generally used for conveying water in India is
stainless steel
cast iron
wrought iron
lead lined steel
cast iron
396
Which of the following is the softest material ?
Quartz
Calcite
Corrundum
Flourite
Calcite
397
Thermosetting polymers are
injection moulded
cast molded
extruded
none of these
cast molded
398
Maximum consumption of lead is in the manufacture of ___.
storage batteries.
solder alloys.
electric cable sheathing.
lead lined vessels.
storage batteries.
399
Clock pendulums are usually made of __________ steel.
high speed
stainless
heat resisting
none of these
none of these
400
Which of the following is produced by addition polymerisation ?
Polybutadiene
Phenol formaldehyde
Urea-formaldehyde
Dacron
Polybutadiene
401
With increase in the carbon percentage in the steel, its
hardness increases.
ductility reduces.
tensile strength increases.
all (a), (b) and (c)
all (a), (b) and (c)
402
_________ is used for determining the tensile strength of steels.
Hydraulic press
Universal testing machine
Mechanical press
none of these
Universal testing machine
403
Mild steel storage vessels are suitable for the storage of ___.
anhydrous ammonia
fatty acids
hydrochloric acid (95%)
sulphuric acid (25%)
anhydrous ammonia
404
Mild steel is a/an __________ steel.
low carbon
medium carbon
high carbon
high alloy
low carbon
405
Hardened steel is softened by
normalising
tempering
annealing
carburising
tempering
406
Which of the following is not shipped in mild steel containers ?
Acetone
Ammonia
Ethyl alcohol
Formic acid
Formic acid
407
Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
corrosion resistance
tensile strength
machinability
compressive strength
machinability
408
Maximum consumption of copper is in
utensil manufacture.
electrical industry.
industrial equipment manufacture.
small scale industries.
electrical industry.
409
Maximum carbon content in cast iron is __________ percent.
3.8
5.2
4.8
4.3
4.3
410
Manganese in steel affects its
ductility
tensile strength
hardness
none of these
tensile strength
411
Lead lined equipments & vessels are suitable for:
handling
hydrochloric acid (10%).
nitric acid.
sulphuric acid upto 60°C.
all (a), (b) and (c).
sulphuric acid upto 60°C.
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)
all (a), (b) and (c)
413
The process of coating steel sheets by zinc to improve its corrosion resistance is called:
calorising
galvanising
zincification
tempering
galvanising
414
_________ does not contain copper as an alloying element,
Nichrome
Manganin
Perminivar
Monel metal
Nichrome
415
Reactor used in the production of polyvinyl chloride (PVC) is made of
nickel or glass lined steel
aluminium
tantalum
lead
nickel or glass lined steel
416
_________ is added in low carbon steel to raise its yield point.
Sulphur
Phosphorous
Silicon
Manganese
Manganese
417
________ iron is produced, when molten pig iron is allowed to cool gradually.
White cast
Grey cast
Wrought
none of these
Grey cast
418
Cast iron vessels are not suitable for the storage of
freon
H2SO4 (95%) at room temperature
H2SO4 (fuming)
wet SO2
wet SO2
419
Condenser tubes are not made of
cartridge brass
muntz brass
wood metal
aluminium brass alloy
wood metal
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).
all (a), (b) and (c).
421
Addition of __________ in steel is helpful in increasing the depth of hardness.
chromium
sulphur
vanadium
tungsten
chromium
422
Hydrochloric acid is stored in a__vessel.
lead lined steel
rubber lined steel
stainless steel
cast iron
rubber lined steel
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).
high corrosion resistance.
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.
Presence of silicon in steel decreases its electrical resistance.
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).
all (a), (b) and (c).
426
Liners of a ball mill are never made of ___.
lead
alloy steel
rubber or ceramic material
cast iron
lead
427
Most of the common metals have __________ crystal structure.
cubic
hexagonal
orthorhombic
none of these
cubic
428
Cast iron is a __________ material.
brittle
ductile
tough
malleable
brittle
429
Hydrocyanic acid is not shipped in
cast iron vessels.
steel cylinders.
aluminium containers.
monel drums.
cast iron vessels.
430
Spark plugs are made of
high alumina ceramic
metallic carbides
corundum
carborundum
high alumina ceramic
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
stainles steel
432
Gas holder of a gobar (cowdung) gas plant is made of
molybdenum stainless steel
tin
mild steel
aluminium
mild steel
433
A material capable of undergoing large permanent deformation, when subjected to tension is termed as
friable
ductile
brittle
none of these
ductile
434
Bell metal is an alloy of
copper & zinc
copper & tin
copper & nickel
zinc & tin
copper & tin
435
Mercury is transported in metal containers made of
aluminium
iron
lead
nickel
iron
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).
all (a), (b) and (c).
437
Inconel is an alloy of
tin, zinc and nickel
iron, nickel and chromium
copper and nickel
copper and tin
iron, nickel and chromium
438
A measure of toughness of a material is its
percentage elongation
yield strength
ultimate strength
area under stress-strain diagram
yield strength
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
stainless steel or glass lined vessel
440
Cast iron is having very high ___.
proximity between its elastic limit and ultimate breaking strength.
ductility.
tensile strength.
all (a), (b) and (c).
proximity between its elastic limit and ultimate breaking strength.
441
The material of construction of bearings is
cast iron
babbit metal
pig iron
steel
babbit metal
442
Wrought iron is a suitable material of construction for handling __________ solutions.
dilute acidic
concentrated acidic
alkalis & alkaline
none of these
alkalis & alkaline
443
Hastelloy comprises of
copper and tin
copper and nickel
molybdenum and nickel
lead and tin
molybdenum and nickel
444
Metalloid is:
an element, which exhibits the properties of both metal & non metal.
highly electronegative in nature.
an alloy.
all (a), (b) & (c)
an element, which exhibits the properties of both metal & non metal.
445
Stainless steel contains:
chromium and nickel
copper
aluminium
vanadium
chromium and nickel
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.
abundant availability.
447
Metal at the top of the electromotive series is:
least active
most stable
most active
most noble
most active
448
Fatigue failure of a material may occur, when it is subjected to __________ stress.
fluctuating
tensile
compressive
torsion
fluctuating
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
acetic acid
450
An alloy of iron containing 4% carbon is called
high carbon steel
wrought iron
mild steel
none of these
none of these
451
Steel pipes are normally manufactured by __________ process.
extrusion
cold working
forging
electroforming
extrusion
452
Polymorphism is not exhibited by __.
carbon
iron
phosphorous
none of these
none of these
453
Rubber lined vessels are corroded by the action of ___.
aqua regia
chloroform
sulphuric acid (95%)
all (a), (b) and (c)
all (a), (b) and (c)
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
Strain ageing
455
Which of the following metals in not used for coating of the base metal to guard it against corrosion ?
Lead
Cadmium
Magnesium
Aluminium
Magnesium
456
Brass container is suitable for storing
aqueous ammonia
beer
H2SO4(95%)
phosphoric acid (95%)
beer
457
Aqueous nitric acid is stored in __________ vessel.
plain carbon steel
stainless steel
cast iron
thermosetting plastic material
cast iron
458
A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.
zinc
mercury
lead
tin
mercury
459
Graphite is corroded by
sulphuric acid (10%)
sea water
hydrochloric acid
none of these
none of these
460
Carbon is present in the uncombined (graphitic) form in case of __.
cast iron
steel
ferroalloy
none of these
cast iron
461
Among the tin containing alloys, __________ consumes the maximum amount of tin.
solder
white metal
pewter matal
bronzes
solder
462
The hardest material just prior to diamond in Mhos scale is
topax
carborundum
corrundum
calcite
corrundum
463
The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.
abrasive
corrosive
both (a) & (b)
neither (a) nor (b)
abrasive
464
Cast iron compared to steel is better in
ductility
fluidity & castability
strength
malleability
fluidity & castability
465
Plasticisers are added to polymers to improve their
tensile strength.
softness & flexibility.
acid resistance.
alkali resistance.
softness & flexibility.
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
stainless steel or glass lined steel
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
acidic refractory
468
The softest material in Mho's scale (for measuring hardness) is
talc
gypsum
rubber
none of these
talc
469
Monel metal is an alloy of
molybdenum and nickel.
nickel and copper.
molybdenum and aluminium.
molybdenum and zinc.
nickel and copper.
470
German silver is an alloy of copper, nickel and
zinc
silver
tin
lead
zinc
471
The presence of impurities in iron
increases its melting point.
does not affect its melting point.
decreases its melting point.
makes it malleable.
decreases its melting point.
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
Silicon steel
473
Which of the following is not an alloy of copper ?
Muntz metal
Admirability gun metal
German silver
Pewter metal
Pewter metal
474
Which of the following is the most prone to atmospheric corrosion ?
Silver
Iron
Tin
Copper
Iron
475
As the impurities are oxidised, the melting point of iron
decreases.
remains unchanged.
increases.
may increase or decrease ; unpredictable.
increases
476
In a plate type heat exchanger, heat transfer plates are never made of
stainless steel
cast iron
titanium
hastealloy C
cast iron
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
one fifth
478
Ball bearings are generally made of
plain carbon steel
chrome carbon steel
stainless steel
malleable cast iron
chrome carbon steel
479
Mild steel is a/an __________ steel.
low carbon
medium carbon
high carbon
high alloy
low carbon
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
chiesels
481
Which is the purest form of iron ?
Wrought iron
Pig iron
Bessemer iron
Grey iron
Wrought iron
482
hite cast iron as compared to grey cast iron is
more durable
very brittle
very hard
all (a), (b) & (c)
all (a), (b) & (c)
483
Combination of metals and ceramics are called
metalloy
cermets
pellets
non-crystalline ceramics
cermets
484
_________ iron is produced, when molten pig iron is chilled suddenly.
White cast
Grey cast
Wrought
none of these
White cast
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
Nickel
486
Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
cermet
glass
thermosetting plastic
metallic alloy
glass
487
'Age hardening' of duralumin is due to
copper
magnesium
both (a) & (b)
neither (a) nor (b)
both (a) & (b)
488
_________ is a donor impurity for semi-conductors.
Boron
Antimony
Gallium
none of these
Antimony
489
Post weld heat treatment is done by
normalising
stress relieving
tempering
solution annealing
stress relieving
490
How many atoms are there per unit cell in a body centred cubic lattice system ?
2
3
4
6
2
491
Presence of cobalt in steel improves its
cutting ability
corrosion resistance
tensile strength
none of these
cutting ability
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.
appreciable strain hardening is produced.
493
Nickel base alloys with __________ are known as monel metal.
zinc
tin
copper
molybdenum
copper
494
Wrought iron is having very high
hardness.
strength.
corrosion resistance.
susceptibility to changes in its properties by heat treatment.
corrosion resistance.
495
When iron is rusted, it is
converted to a fine powder
reduced
oxidised
none of these
oxidised
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).
hydrochloric acid (concentrated).
497
How many molecules per unit cell are there in a face centred cubic lettice ?
2
4
6
8
4
498
Which of the following comprises of hydrocarbons ?
Mica flakes
Glass
Rubber
None of these
Rubber
