Materials and Construction Flashcards
(512 cards)
1
Q
The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.
A
non-crystalline organic polymeric.
2
Q
Coke oven regenerators are made of __________ bricks.
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) ?
A
invar
4
Q
Shock resisting steels should possess high
A
toughness
5
Q
The purpose of nitriding the steel is to
A
harden its surface.
6
Q
Ceramic recuperators are generally made of
A
silicon carbide.
7
Q
Hammers and railway rails are normally made of
A
high carbon steel
8
Q
Softness of silver can be converted into hardness by alloying it with small quantity of
A
copper & nickel
9
Q
The addition of antimony in tin-based alloys improves its
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 ?
A
Lead
11
Q
The main purpose of galvanising iron sheets is to
A
prevent the action of water.
12
Q
The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
A
4
13
Q
Invar used in thermocouples is an alloy of nickel and
A
iron
14
Q
Nickel (56%) and molybdenum (17%) alloys are called
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
A
acetic acid
16
Q
Constituents of stellite are
A
cobalt, chromium and tungsten.
17
Q
Residual magnetism in steel for magnets is increased by the addition of
A
cobalt
18
Q
Presence of nickel in steel improves its
A
corrosion resistance.
19
Q
Cementite is
A
all (a), (b) and (c).
20
Q
Acetylene gas holder is made of
A
steel
21
Q
Sulphur melting pit in the sulphuric acid plant is made of
A
steel or cement-brick lined.
22
Q
The hardest material just prior to diamond in Mho’s scale is
A
corrundum
23
Q
Percentage elongation of a material is a measure of its
A
ductility
24
Q
Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with
A
lead or glass
25
Heavy duty bearings are usually made of
white metal
26
Dielectric strength of a material is
its capacity to withstand high voltage.
27
Which of the following stainless steels is non-magnetic ?
Austenitic
28
18-4-1 high speed steel contains 18%, 4% and 1% respectively of
tungsten, chromium and vanadium
29
Aluminium as a material of construction suffers from the disadvantage of
rather low tensile strength.
30
Babbit metal used for bearings is a____base alloy.
tin
31
18/8 steel is a/an __________ stainless steel.
austenitic
32
Cast iron has very high
compressive strength
33
Liquid ammonia is shipped in __________ containers.
glass
34
Cermets are __________ materials.
refractory
35
Cast irons are generally specified by their
tensile strength
36
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
12-14
37
White cast iron is not
malleable
38
Galvanised iron is
protected from rusting
39
German silver used for decorative purposes contains maximum percentage of
copper
40
The metals occuring at the lower most position in the electromotive series
resist corrosion very strongly.
41
German silver in an alloy of
copper, nickel and zinc.
42
A suitable material of construction to use with fuming sulphuric acid is
monel
43
Which of the following crystal structures characterises the austenitic stainless steel?
Face centred cubic
44
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
graphite and moving mercury.
45
Addition of __________ in steel can help in increasing the depth of hardness.
tungsten
46
Which of the following has the highest compressive strength ?
High carbon steel
47
Zinc is not used
as an alloying element in various bronzes.
48
Refined acetic acid storage vessel are made of
aluminium
49
Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
cobalt
50
Constantan is an alloy of
Cu (55%) & Ni (45%).
51
Babbit metals used for making bearings are
tin or lead based alloys.
52
Pipes for bi-cycle frames are made of __________ steel.
cold rolled
53
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ?
Brass, cast iron, mild steel and tin.
54
Interchain forces are the weakest in case of
both rubber & elastomers
55
__________ possesses viscoelastic properties.
Rubber
56
Steel tower used for the storage of oleum
need not be lined.
57
Plastics are
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
59
Wood is corroded by
all (a), (b) and (c)
60
Brass is an alloy of
copper and zinc
61
Lead
can not be work hardened.
62
Photographic plates are coated with
silver halide
63
Cast iron has
elastic limit close to ultimate breaking strength.
64
Locomotive boiler tubes are made of __________ alloys.
arsenic copper
65
Slow and progressive deformation of a material with time under constant stress is called
creep
66
Which of the following heat treatment processes is used for softening the hardened material ?
Tempering
67
Which of the following mechanical properties of a material is most structure insensitive ?
Modulus of elasticity (young's modulus).
68
Mercury is transported in metal containers made of
iron
69
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
Stainless steel
70
Which of the following has the least carbon percentage ?
Wrought iron
71
The range of Mho's scale of hardness is from
l to10
72
Which of the following pairs of elements may form an alloy ?
Iron & carbon
73
SO3 is absorbed using H2SO4 in a
packed steel tower lined with acid proof bricks.
74
Carbon percentage in medium carbon steel is around
0.35 to 0.5
75
The preferred material of construction for storage tanks for 98% sulphuric acid is
lead
76
The fermentor used for the production of ethyl alcohol from molasses is made of
copper bearing steel
77
Super conductors are those substances, which
offer no resistance to current flow.
78
Cermets are used for making
both (a) & (b)
79
The formation of oxide film on a metal due to atmospheric exposure reduces its
creep limit
80
A hardened steel essentially contains
martensite
81
Which one contains the least percentage of carbon ?
Wrought iron
82
Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of
steel
83
All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain
increases very quickly.
84
Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)
are used for leaf and coiled springs.
85
Which of the following is not a copper based alloy with nickel ?
Inconel
86
Which of the following alloys does not contain nickel ?
Babbit metal
87
An elastic behaviour of materials is expressed in terms of
relaxation time
88
Pure nickel is
ferromagnetic at room temperature.
89
In drop forging process, the forging is done by dropping the __________ at high velocity.
die with hammer
90
Which of the following is not an alloy of copper and tin ?
Monel metal
91
__________ is never shipped in glass carboys.
Ammonia
92
Lead is
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
94
Addition of 2% nickel in steel makes it suitable for making
boiler plates, rivets etc.
95
The softest material just next to talc in the Mhos scale is
gypsum
96
Fatigue strength of a material increases by
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
98
Aluminium storage vessel can be used to store
none of these
99
Silicone rubber is not resistant to the corrosive action of
both (b) and (c)
100
Which metal is protected by the layer of its own oxide ?
Aluminium
101
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
endurance limit
102
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).
103
Wrought iron is a suitable material of construction for handling __________ solutions.
alkalis & alkaline
104
Steel rods are used in reinforced concrete to increase its __________ strength.
tensile
105
Corrosion involves exchange of electrons in __________ corrosion.
both (a) & (b)
106
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%) ?
High frequency transformers.
107
Which of the following has the least value of ultimate tensile strength (UTS) ?
Cast iron
108
__________ does not contain tin as an alloying material.
Brass
109
A metallic alloy in general as compared to their pure metal components is
more corrosion resistant.
110
Pick out the wrong statement.
Wrought iron can not be easily forged and welded.
111
The increase in hardness of metal due to its cold working is termed as the __________ hardening.
work
112
Copper is dissolved from its ore by H2SO4 in a percolation tank made of
reinforced concrete lined with lead
113
Bearings subjected to light load are made of
phosphorous bronze
114
Softening of hardned steel is done by its
tempering
115
Maximum permissible sulphur content in steel is __________ percent.
0.055
116
Ceramic materials fabrication can not be done by
welding
117
Which has the maximum melting point out of the following ?
Wrought iron
118
Cast iron is
all (a), (b) & (c)
119
Which of the following has no effect on the carbide forming tendency in steels ?
Phosphorus
120
Approximate value of the modulus of elasticity for steel is about __________ x l06kg/cm2.
2
121
Carbon is present in steel wholly in the
combined form.
122
Carbon supply in pack carburising process is in the form of
charcoal
123
In SO3 absorber (Contact Process), packing material used is of
chemical stoneware
124
Presence of manganese in alloy steel improves its
abrasion resistance & toughness.
125
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
lead or acid-proof bricks
126
A material is called 'ductile', if it can be
drawn into wires.
127
A chemical change takes place when iron
rusts
128
Evaporator used for concentrating tomato juice is made of
stainless steel-glass lined
129
High carbon steel contains more than __________ percent carbon.
0.5
130
The main constituent of carborundum is __________ carbide.
silicon
131
For storing water and acid free benzol, use a __________ vessel.
steel
132
The chlorinator used in the manufacture of DDT is made of
glass lined steel
133
Reduction in the grain size reduces the __________ of the material.
creep resistance
134
Age hardening is concerned with
duralumin
135
Which of the following undergoes granular fracture ?
Steel
136
Ball bearings are normally made of __________ steel.
chrome
137
The electrical conductivity of a __________ decreases with rise in temperature.
metal/alloy
138
Which one occupies the lowermost position in the electromotive series of metals ?
Noble metals (Ag, Pt, Au)
139
Addition of nickel to copper improves its
hardness
140
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
bismuth
141
High speed cutting tool steels contain about __________ percent of tungsten.
18-20
142
The 'bomb' in the bomb calorimeter is made of
molybdenum stainless steel
143
Which of the following is produced by condensation polymerisation ?
Bakelite
144
The crystal structure of most of the common metals is
cubic
145
Telfon (PTFE) is corroded by
none of these
146
Hastelloy C is a good material of construction in chemical process industry, since it is
light and resists attack by acids.
147
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
cast iron
148
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.
149
Pick out the wrong statement.
Thermal conductivity of aluminium is higher than that of copper; hence it is increasingly used for utensil making.
150
The specific gravity of coal depends mainly on its __________ content.
ash
151
Carbon percentage is the same in cast iron and
pig iron
152
Pick out the wrong statement.
The ability of a material to fracture without appreciable deformation is called its ductility.
153
Which of the following has the highest density and the lowest melting point ?
Lead
154
In order to be called steel, an alloy should have iron percentage greater than
80
155
Nickel is a constituent of
monel metal
156
Soap kettle used in the production of laundry soap is made of
steel with top section nickel clad or stainless steel
157
Nickel made/clad equipments are suitable for handling
fruit juices, milk & its products and caustic soda solution.
158
Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
copper
159
In hot wire aneomometer used for gas flow measurement, the wire is normally made of
platinum
160
The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
normalising
161
Mild steel is used for making
channels
162
Presence of 0.3 to 0.5% arsenic in copper increases its
tenacity & hardness
163
The heat treatment process applied to cold formed steel parts is
solution annealing
164
The largest consumption of zinc for alloys is in the making of
brasses
165
Plate and frame filter press is usually made of
cast iron
166
Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
rubber or durmet-20 lined
167
Nickel and copper are the basic constituents of
monel metal
168
Copper has very low
tensile strength
169
Hardest material so far found is
Hardest material so far found is
170
Most suitable material of construction for the storage of concentrated nitric acid is
aluminium or chromium alloys (Cr > 18% for cold acid)
171
The most resistant material to alkaline corrosion is
nickel
172
Tin coating is not done by
vaporising
173
Stainless steel is not corroded by
nitric acid (10%).
174
__________ is added in stainless steel to prevent inter crystal corrosion.
Niobium
175
Nickel is a __________ material.
ferromagnetic
176
Babbit metal is not a
pure metal
177
Which of the following alloys does not contain nickel ?
Babbit metal
178
Which of the following is the lightest of engineering metals ?
Magnesium
179
Evaporators used in caustic soda recovery and production plant are made of
monel metal
180
With increase in carbide/graphite ratio in cast iron, its
both (a) and (b).
181
The fermentor used in the production of pencillin (by deep fermentation process) is made of
glass lined steel
182
Nickel (76%) and chromium (15%) alloys are termed as
inconel
183
Low carbon steels are those in which carbon percentage is around
0.1 to 0.35
184
White metal is an alloy of
none of these
185
The carbonating tower used in Solvay process of soda ash manufacture is made of
cast iron
186
For platinum thermocouples, lead wires are made of
copper & copper-nickel alloys.
187
High resistance electrical heating elements/wire are not made of
marageing steel
188
Cast irons are generally specified by their
tensile strength
189
Which one is remelted and poured into moulds to get cast iron ?
Pig iron
190
Wood metal is not used for making
storage tank for storing brine and caustic soda.
191
An ideal material of construction for the storage of 50% caustic soda solution would be
monel
192
Which of the following is the hardest ?
Austenite
193
Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?
Nickel-chrome steelZircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium
194
The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
sintering
195
Sulphuric acid pickling tanks are lined with
rubber
196
Valves in pipe size of 2" and under are normally made of
brass
197
Ceramic materials are
stronger in compression than in tension
198
Which is an amorphous material ?
Glass
199
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of
cast iron
200
Platinum and silver are corroded by
none of these
201
Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium
tin, nickel, iron and chromium
201
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
flanges
201
Work hardening of a material
decreases its ductility.
201
The material used in the filament of electric bulbs is
tungsten
201
Caustic soda can be stored in __________ drums.
steel
202
Wrought iron is
malleable & ductile; and hence is used for chain links, hooks & couplings.
203
Perspex is nothing but
acrylic sheet
204
Centrifugal pump made of pyrex or glass can't be used to pump
alkaline solutions.
205
Ability of a material to __________ is indicated by its damping capacity.
absorb vibration
206
Corrosion resistance of steel is increased by the addition of
nickel and chromium.
207
Hydrochloric acid is __________ corrosive to common metals.
highly
208
Tank furnace used for melting of glass is made of
refractory blocks
209
Spray dryer for evaporating milk to produce milk powder is made of
stainless steel
210
Chromel (Nichrome) is an alloy of
nickel and chromium.
211
Which of the following is not an alloy of nickel and chromium ?
Duralumin
212
Thermoplastic resins are those polymers, which
easily deform under pressure at high temperature.
213
The temperature at which new grains are formed in the metal is called the __________ temperature.
recrystallisation
214
Molten phthalic anhydride is stored in a/an __________ vessel.
aluminium
215
Fatigue failure of a material results from __________ stress.
fluctuating
216
Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel
glass
217
Pick out the wrong statement.
Tungsten has a body centred cubic (bcc) crystal lattice structure.
218
Ability of a material to absorb energy in deformation in the plastic range is characterised as its
toughness
219
Monel alloy is
used for making steam valves and turbine blades as it resists steam attack at high temperature.
220
Molybdenum steels containing 0.15 to 0.40% molybdenum
are used for automobile parts like gears, axle, shaft, bearings etc.
221
Kel-F is a material, which is
all (a), (b) and (c).
222
Presence of high amount of silicon in cast iron
increases the formation of graphite.
223
Rubber lined pumps can be used to pump
all (a), (b) and (c)
224
Titanium metal
is used in oceanographic and space exploration applications.
225
Purity of electrical grade aluminium should be ≥ __________ percent.
99.5
226
Maximum consumption of zinc is in
galvanising
227
Hardest materials so far found is
diamond
228
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
sheradising
229
Which of the following commercial metals is most abundantly found in India ?
Aluminium
230
Tin vessels are corroded by
none of these
231
Out of the following, copper vessels are the most suitable for the storage of
dry chlorine & dry fluorine.
232
Tempering of steel is done to make it
soft
233
Concrete tank can be used to store
saturated brine
234
Zinc is highly __________ at room temperature.
resistant to atmospheric corrosion
235
Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property ?
Silicon
236
Most common stainless steel type 316, which is highly resistant to corrosion contains
16-13% Cr 10-14% Ni and 2-3% Mo.
237
Sheardising process is used for
surface coating.
238
The maximum percentage of chromium that can be added to steel is about
18
239
Which of the following is a non-magnetic material ?
Zinc
240
An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
constantan
241
The material of construction of pressure mills used for squeezing out the juice from sugar cane is
cast iron
242
Rotary driers are generally made of
mild steel
243
Presence of high phosphorous in cast iron increases its
fluidity
244
The phenomenon in which slow extension of material takes place with the time at constant load is called
creep
245
A material capable of undergoing large permanent deformation, when subjected to compression is termed as
malleable
246
__________ is used for examining the macro-structure of a material.
Visual inspection by naked eye
247
High speed steel tools retain their hardness upto a temperature of __________ °C.
900
248
Dry chlorine can be handled in a vessel made of
iron or steel
249
Brine solution is stored/treated in __________ lined vessels/pipes.
nickel
250
Steel balls for ball bearings are generally made of __________ steel.
carbon chrome
251
Beehive coke ovens are made of __________ bricks.
silica
252
Muntz metal is a/an alloys of
copper & zinc
253
Rotary kilns in cement industry are lined with____bricks.
high alumina & high magnesia
254
Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
0.2
255
Which of the following will have the highest melting point ?
Wrought iron
256
Galvanising is generally done on
low carbon steel
257
Carbon is present in the combined form (carbide) in case of
all (a), (b) & (c)
258
Chilled iron castings are
highly wear resistant
259
A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.
5
260
Presence of nitrogen in steel
makes it brittle.
261
Very high sulphur in pig iron makes
its casting unsound.
262
Amount of energy that a material can absorb before its fracture is a measure of its
toughness
263
Anodic material used for the cathodic protection of underground buried steel pipeline is
zinc or magnesium
264
Bush bearings are made of
phosphorous bronze
265
Alinco, which is a aluminium-cobalt-nickel steel, is used for making
powerful magnets
266
Slow plastic deformation of metals under a constant stress is termed as __________ failure.
creep
267
Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of
silicon
268
Pick out the wrong statement
both (b) and (c)
269
Duriron is
all (a), (b) and (c).
270
Pick out the correct statement.
Hardening of a soft metal can be done by alloying it with another metal or non-metal.
271
Cast iron detachable joint is used in __________ pipes.
steel
272
Tin coating on metals is not done by
powder metallurgy
273
The softest material just next to talc in the Mho's scale is
gypsum
274
18/8 stainless steel means, that it contains
18% chromium and 8% nickel.
275
Glass is corroded by
fluorine (dry or wet)
276
Iron alloyed with carbon upto 2% is called
none of these
277
Which of the following is a low melting point metal ?
tin
278
Trough of an apron conveyor is made of
either (b) or (c)
279
Pick out the wrong statement.
Cold working of a metal decreases its fatigue strength.
280
Which of the following finds the least commercial use ?
Pure iron
281
Which of the following is the most widely used insulating material for steam carray-ing pipelines ?
Glass wool and 85% magnesia
282
Silicon percentage in iron castings to have maximum hardness should be about
0.8
283
Nickel as a material of construction
is used as an alloying element for both ferrous & non-ferrous alloys.
284
__________ moulding process can not be used for thermoplastic plastics.
Injection
285
Which of the following crystal structures characterises the ferritic stainless steel ?
Body centred cubic
286
'Semi steel' is
both (a) and (b).
287
Gun metal is an alloy of
copper, tin and zinc
288
Carbon content in steel is __________ percent.
0.1-2
289
Nitriding of steel is a process for
case hardening
290
Which of the following has a very high carbide forming tendency in steels ?
Vanadium
291
The most distinguished property of malleable cast iron is its high
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.
proof
293
Which of the following is the hardest material ?
Corrundum
294
Which of the following material of construction may be recommended by a chemical engineer for handling a gaseous chlorine (dry or wet) stream in a fluid flow system ?
High silicon iron, silicon rubber, Kel-F and teflon.
295
Biological shield in a nuclear power reactor is made of
concrete
296
Caustic soda is transported in __________ lined containers.
either (b) or (c)
297
Acid proof stoneware
all (a), (b) and (c).
298
Diamagnetic materials are magnetised
in a direction opposite to that of the applied field.
299
High degree of toughness is a must for
shock resisting steel
300
'Hypersil' is a __________ steel.
silicon
301
__________ can replace tungsten in high speed steel,
Molybdenum
302
Polythene (low or high density) containers are not corroded by
sulphuric acid (10%) at room temperature.
303
Bronze is an alloy of copper and
tin
304
Which of the following exercises most powerful influence on the mechanical properties of steel ?
Carbon
305
Percentage of silver in German silver is
0
306
Balls in a ball mill are usually made of
steel
307
DDT is shipped in
either (b) or (c)
308
Constantan used in thermocouples is an alloy of
none of these
309
A material is able to retain the deformation permanently by virtue of its
plasticity
310
__________ steel is widely used for the manufacture of motor car crankshafts.
Chrome
311
Galvanising (i.e., zinc coating) of steel sheets is done to
both(a) & (b).
312
Which of the following is not a nickel based alloy ?
Babbit metal
313
Coke oven walls are lined with __________ bricks.
silica
314
Iron rust is
hydrated ferric oxide.
315
Urea autoclave is made of
stainless steel
316
Mild steel is
a low carbon steel (0.05 to 0.3% carbon).
317
Dilute sulphuric acid is transported in __________ pipes.
lead
318
__________ alloys have the highest specific strength of all the structural materials out of the following.
Titanium
319
100% H2SO4 at 30°C can't be stored in a vessel made/lined with
aluminium, tin and rubber.
320
Carbon content in plain carbon steel is __________ percent.
0.35 to 0.45
321
Duralumin is an alloy of
aluminium, copper and manganese.
322
Silicon percentage in acid resistant cast iron is about
14
323
Concentrated HCl at 30°C can be stored in a vessel made of
PTFE and porcelain.
324
Which of the following stainless steels is non-magnetic ?
Austenitic
325
A magnetic material becomes __________ above the Curie temperature.
paramagnetic
326
Which of the following is not a non-ferrous alloy ?
Meehanite
327
Which of the following is the most elastic material ?
Steel
328
Water gas generator is made of
carbon steel-brick lined
329
The digester of a Gobar gas plant is a
masonry well
330
The ability of a material to offer resistance to scratching or indentation is a measure of its
hardness
331
Brine (15% concentration) can be stored in a vessel made of
monel
332
Generally __________ are subjected to galvanising (i.e., zinc coating).
low carbon steels
333
A material no longer behaves elastically beyond
elastic limit
334
When the steel is subjected to normalising, its __________ decreases.
ductility
335
The most commonly used resin for making reinforced plastic is
unsaturated polyester
336
Most suitable material for high pressure vessel operating at 500 atm. and 500° C is
molybdenum stainless steel.
337
Brinell Hardness Number (BHN) for talc is approximately in the range of
20-30
338
Dies for wire drawing are generally made of
carbides
339
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
340
Which of the following contains maximum percentage of carbon ?
Saws for cutting steel
341
Tempering of steel is done to make it
soft
342
Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
high strength to weight ratio.
343
Babbit metal used for making bearings should have
high-co-efficient of friction between journal and bearing.
344
Vessels made of __________ can be used to store dry chlorine.
steel or iron
345
For spinning viscose rayon, the extrusion spinnerettes are made of
platinum or gold alloys
346
Alpha iron is stable __________ °C.
upto 910
347
Babbit metal (used for making bearings) comprises of
mainly tin (85%) and lead.
348
Hydrochloric acid is stored in a __________ steel vessel.
rubber lined
349
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.
350
Which of the following alloying elements is present in maximum percentage in high speed steel.
Tungsten
351
Electronic structure of a material is generally studied by
spectroscopic techniques
352
Which of the following has the poorest wel-dability ?
High-carbon steel
353
Creep is not exhibited at low temperature by
lead
354
Nickel and molybdenum are the basic constituents of
hastealloy
355
Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
manganese
356
A steel alloy containing 36% nickel is called __________ , which has a zero co-efficient of expansion.
invar
357
Which of the following is not used as the ceramic material in 'cermets' ?
Nitrides
358
Glass lined vessels are not used for handling/storing
hydroflouric acid
359
For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
cast iron
360
Cast iron has
its elastic limit very close to ultimate breaking strength.
361
Which of the following is not an alloy of tin?
German silver
362
Which of the following is the easiest to bend?
Wrought iron
363
Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
partly crystalline
364
In the kraft (sulphate) process for the paper manufacture, the digestor is made of
stainless steel
365
Cast iron and steel pipes are produced by __________ casting.
true centrifugal
366
Cold worked steel parts are normally subjected to
annealing
367
Graphite is a good
both (b) & (c).
368
Lead alone is not used in storing equipment, because it
is having low creep strength.
369
H2SO4 (< 50% concentration) is corrosive to
aluminium, mild steel, stainless steel, concrete & tin.
370
In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of
steel
371
A bearing metal should not have
low thermal conductivity.
372
__________ is not a case hardening process.
Annealing
373
Materials having __________ lattice structure are usually most ductile.
f.c.c.
374
Invar contains the highest percentage of
iron
375
Metalloid is
an element which exhibits the properties of both metal & non-metal.
376
The ability of a material to absorb energy in the elastic range is a measure of its
resilience
377
Phenol is not shipped in
cast iron containers.
378
To improve the machinability of steel, it is generally subjected to
spheroidising
379
Glass lined vessels are not used for handling
hydroflouric acid
380
Hardening of steel is not possible unless it is heated __________ critical point.
above the lowest
381
Hydrochloric acid absorber in made of
karbate
382
Pick out the wrong statement.
Tin can be readily and very easily drawn into very fine wire.
383
Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.
stainless steel
384
Presence of silicon in steel
decreases the blow holes formation tendency in castings.
385
Pick the odd man out of the following.
Calorising
386
Cold work tool steel should have
high wear resistance
387
Aqueous nitric acid is stored in
stainless steel vessel
388
Addition of tungsten to steel imparts
cutting hardness
389
Hot working of lead is carried out at
room temperature
390
Which of the following is a light alloy ?
Dow metal
391
Thermosetting resins are those polymers, which
do not increase in plasticity with rise in temperature.
392
Ceramic materials
all (a), (b) and (c).
393
Light weight metallic alloy used in aircraft industry is
duralumin
394
Which of the following is an alloy of nickel and copper ?
Monel
395
Gunmetal and bronze are not corroded by the action of
synthetic detergent solution.
396
Atmospheric corrosion of metals result from their
slow oxidation
397
Karbate is
both (b) and (c).
398
To improve the machinability of steel by its softening, it is subjected to
annealing
399
Which one has the maximum tensile strength out of the following ?
Nodular cast iron
400
Material of construction of pipe generally used for conveying water in India is
cast iron
401
Which of the following is the softest material ?
Calcite
402
Thermosetting polymers are
cast molded
403
Maximum consumption of lead is in the manufacture of
storage batteries.
404
Clock pendulums are usually made of __________ steel.
none of these
405
Which of the following is produced by addition polymerisation ?
Polybutadiene
406
With increase in the carbon percentage in the steel, its
all (a), (b) and (c).
407
__________ is used for determining the tensile strength of steels.
Universal testing machine
408
Mild steel storage vessels are suitable for the storage of
anhydrous ammonia
409
Mild steel is a/an __________ steel.
low carbon
410
Hardened steel is softened by
tempering
411
Which of the following is not shipped in mild steel containers ?
Formic acid
412
Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
machinability
413
Maximum consumption of copper is in
electrical industry.
414
Maximum carbon content in cast iron is __________ percent.
4.3
415
Manganese in steel affects its
tensile strength
416
Lead lined equipments & vessels are suitable for handling
sulphuric acid upto 60°C.
417
Carbon tetrachloride can be stored in a storage vessel made of
all (a), (b) and (c)
418
The process of coating steel sheets by zinc to improve its corrosion resistance is called
galvanising
419
__________ does not contain copper as an alloying element,
Nichrome
420
Reactor used in the production of polyvinyl chloride (PVC) is made of
nickel or glass lined steel
421
__________ is added in low carbon steel to raise its yield point.
Manganese
422
__________ iron is produced, when molten pig iron is allowed to cool gradually.
Grey cast
423
Cast iron vessels are not suitable for the storage of
wet SO2
424
Condenser tubes are not made of
wood metal
425
Tin in its pure form is used for making
all (a), (b) and (c).
426
Addition of __________ in steel is helpful in increasing the depth of hardness.
chromium
427
Hydrochloric acid is stored in a__vessel.
rubber lined steel
428
Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its
high corrosion resistance.
429
Pick out the wrong statement.
Presence of silicon in steel decreases its electrical resistance.
430
Ferric stainless steels compared to austenitic stainless steels
all (a), (b) and (c).
431
Liners of a ball mill are never made of
lead
432
Most of the common metals have __________ crystal structure.
cubic
433
Cast iron is a __________ material.
brittle
434
Hydrocyanic acid is not shipped in
cast iron vessels.
435
Spark plugs are made of
high alumina ceramic
436
The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement.
both'a' & 'b'
437
Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of
stainles steel
438
Gas holder of a gobar (cowdung) gas plant is made of
mild steel
439
A material capable of undergoing large permanent deformation, when subjected to tension is termed as
ductile
440
Bell metal is an alloy of
copper & tin
441
Mercury is transported in metal containers made of
iron
442
Lead pipe is
all (a), (b) and (c).
443
Inconel is an alloy of
iron, nickel and chromium
444
A measure of toughness of a material is its
yield strength
445
Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of
stainless steel or glass lined vessel
446
Cast iron is having very high
proximity between its elastic limit and ultimate breaking strength.
447
The material of construction of bearings is
babbit metal
448
Wrought iron is a suitable material of construction for handling __________ solutions.
alkalis & alkaline
449
Hastelloy comprises of
molybdenum and nickel
450
Metalloid is
an element, which exhibits the properties of both metal & non metal.
451
Stainless steel contains
chromium and nickel
452
Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower
abundant availability.
453
Metal at the top of the electromotive series is
most active
454
Fatigue failure of a material may occur, when it is subjected to __________ stress.
fluctuating
455
Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.
both (b) and (c)
456
High speed steel should have high
both(b) & (c)
457
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
acetic acid
458
An alloy of iron containing 4% carbon is called
none of these
459
Steel pipes are normally manufactured by __________ process.
extrusion
460
Polymorphism is not exhibited by
none of these
461
Rubber lined vessels are corroded by the action of
all (a), (b) and (c)
462
__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.
Strain ageing
463
Which of the following metals in not used for coating of the base metal to guard it against corrosion ?
Magnesium
464
Brass container is suitable for storing
beer
465
Aqueous nitric acid is stored in __________ vessel.
cast iron
466
A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.
mercury
467
Graphite is corroded by
none of these
468
Carbon is present in the uncombined (graphitic) form in case of
cast iron
469
Among the tin containing alloys, __________ consumes the maximum amount of tin.
solder
470
The hardest material just prior to diamond in Mhos scale is
corrundum
471
The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.
abrasive
472
Cast iron compared to steel is better in
fluidity & castability
473
Plasticisers are added to polymers to improve their
softness & flexibility.
474
Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of
stainless steel or glass lined steel
475
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
acidic refractory
476
The softest material in Mho's scale (for measuring hardness) is
talc
477
Acetaldehyde is shipped in __________ drums.
either (b) & (c)
478
Monel metal is an alloy of
nickel and copper.
479
German silver is an alloy of copper, nickel and
zinc
480
The presence of impurities in iron
decreases its melting point.
481
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines ?
Silicon steel
482
Visco-elastic behaviour of materials which is time dependent is common in
non-crystalline organic polymer
483
Which of the following is not an alloy of copper ?
Pewter metal
484
Which of the following is the most prone to atmospheric corrosion ?
Iron
485
As the impurities are oxidised, the melting point of iron
increases
486
In a plate type heat exchanger, heat transfer plates are never made of
cast iron
487
Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about
one fifth
488
Ball bearings are generally made of
chrome carbon steel
489
Mild steel is a/an __________ steel.
low carbon
490
Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making
chiesels
491
Which is the purest form of iron ?
Wrought iron
492
White cast iron as compared to grey cast iron is
all (a), (b) & (c)
493
Combination of metals and ceramics are called
cermets
494
__________ iron is produced, when molten pig iron is chilled suddenly.
White cast
495
Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?
Nickel
496
Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
glass
497
'Age hardening' of duralumin is due to
both (a) & (b)
498
__________ is a donor impurity for semi-conductors.
Antimony
499
Post weld heat treatment is done by
stress relieving
500
How many atoms are there per unit cell in a body centred cubic lattice system ?
2
501
Presence of cobalt in steel improves its
cutting ability
502
In cold working of metal as compared to its hot working
appreciable strain hardening is produced.
503
Nickel base alloys with __________ are known as monel metal.
copper
504
Wrought iron is having very high
corrosion resistance.
505
When iron is rusted, it is
oxidised
506
Containers made of high silicon cast iron (14% Si) are not suitable for the storage of
hydrochloric acid (concentrated).
507
How many molecules per unit cell are there in a face centred cubic lettice ?
4
508
Which of the following comprises of hydrocarbons ?
Rubber
