matl of construction Flashcards
(247 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 malleability 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 maximum 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
15
Q
Residual magnetism in steel for magnets is increased by the addition of
A
cobalt
15
Q
Constituents of stellite are
A
cobalt, chromium and tungsten.
16
Q
Presence of nickel in steel improves its
A
corrosion resistance.
17
Q
Cementite is
A
Fe3C chemically.
a compound of carbon and iron.
characterised by an orthorhombic crystal structure.
all (a), (b) and (c).
18
Q
Acetylene gas holder is made of
A
steel
19
Q
Sulphur melting pit in the sulphuric acid plant is made of
A
steel or cement-brick lined.
20
Q
The hardest material just prior to diamond in Mho’s scale is
A
corrundum
21
Q
Percentage elongation of a material is a measure of its
A
ductility
22
Q
Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with
A
lead or glass
23
Heavy duty bearings are usually made of
white metal
24
Dielectric strength of a material is
its capacity to withstand high voltage.
25
Which of the following stainless steels is non-magnetic ?
Austenitic
26
18-4-1 high speed steel contains 18%, 4% and 1% respectively of
tungsten, chromium and vanadium
27
Aluminium as a material of construction suffers from the disadvantage of
rather low tensile strength.
28
Babbit metal used for bearings is a____base alloy.
tin
29
18/8 steel is a/an __________ stainless steel.
austenitic
30
Cast iron has very high
compressive strength
31
Liquid ammonia is shipped in __________ containers.
glass
32
Cermets are __________ materials.
refractory
33
Cast irons are generally specified by their
tensile strength
34
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
12-14
35
White cast iron is not
malleable
36
Galvanised iron is
protected from rusting
37
German silver used for decorative purposes contains maximum percentage of
copper
38
The metals occuring at the lower most position in the electromotive series
resist corrosion very strongly.
39
German silver in an alloy of
copper, nickel and zinc.
40
A suitable material of construction to use with fuming sulphuric acid is
monel
41
Which of the following crystal structures characterises the austenitic stainless steel?
Face centred cubic
42
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
graphite and moving mercury.
43
Addition of __________ in steel can help in increasing the depth of hardness.
tungsten
44
Which of the following has the highest compressive strength ?
High carbon steel
45
Zinc is not used
as an alloying element in various bronzes.
46
Refined acetic acid storage vessel are made of
aluminium
47
Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
cobalt
48
Constantan is an alloy of
Cu (55%) & Ni (45%).
49
Babbit metals used for making bearings are
tin or lead based alloys.
50
Pipes for bi-cycle frames are made of __________ steel.
cold rolled
51
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C ?
Brass, cast iron, mild steel and tin.
52
Interchain forces are the weakest in case of
both rubber & elastomers
53
__________ possesses viscoelastic properties.
Rubber
54
Steel tower used for the storage of oleum
need not be lined.
55
Plastics are
non-biodegradable.
56
Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
rubber lined mild steel
57
Wood is corroded by
hydrochloric acid
SO2 (dry or wet)
chlorine (dry or wet)
all (a), (b) and (c)
58
Brass is an alloy of
copper and zinc
59
Lead
can not be work hardened.
60
Photographic plates are coated with
silver halide
61
Cast iron has
elastic limit close to ultimate breaking strength.
62
Locomotive boiler tubes are made of __________ alloys.
arsenic copper
63
Slow and progressive deformation of a material with time under constant stress is called
creep
64
Which of the following heat treatment processes is used for softening the hardened material ?
Tempering
65
Which of the following mechanical properties of a material is most structure insensitive ?
Modulus of elasticity (young's modulus).
66
Mercury is transported in metal containers made of
iron
67
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
Stainless steel
68
Which of the following has the least carbon percentage ?
Wrought iron
69
The range of Mho's scale of hardness is from
l to10
70
Which of the following pairs of elements may form an alloy ?
Iron & carbon
71
SO3 is absorbed using H2SO4 in a
packed steel tower lined with acid proof bricks.
72
Carbon percentage in medium carbon steel is around
0.35 to 0.5
73
The preferred material of construction for storage tanks for 98% sulphuric acid is
lead
74
The fermentor used for the production of ethyl alcohol from molasses is made of
copper bearing steel
75
Super conductors are those substances, which
offer no resistance to current flow.
76
Cermets are used for making
cutting tools
abrasives
both (a) & (b)
77
The formation of oxide film on a metal due to atmospheric exposure reduces its
creep limit
78
A hardened steel essentially contains
martensite
79
Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of
steel
80
Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)
are used for leaf and coiled springs.
81
Which of the following is not a copper based alloy with nickel ?
Inconel
82
Which of the following alloys does not contain nickel ?
Babbit metal
83
An elastic behaviour of materials is expressed in terms of
relaxation time
84
Pure nickel is
ferromagnetic at room temperature.
85
In drop forging process, the forging is done by dropping the __________ at high velocity.
die with hammer
86
Which of the following is not an alloy of copper and tin ?
Monel metal
87
__________ is never shipped in glass carboys.
Ammonia
88
Lead is
used as a shock absorber (in mattress form) between the foundation and steel framework of skyscrapper buildings.
89
Nitriding of steel is done (in electric furnace) at __________ °C.
510
90
Addition of 2% nickel in steel makes it suitable for making
boiler plates, rivets etc.
91
The softest material just next to talc in the Mhos scale is
gypsum
92
Fatigue strength of a material increases by
under stressing the specimen
93
Specify the material of construction suitable for handling concentrated HNO3 at 100°C.
High silicon iron, Kel-F and teflon
94
Aluminium storage vessel can be used to store
none of these
95
Silicone rubber is not resistant to the corrosive action of
sulphuric acid (95%)
ether
both (b) and (c)
96
Which metal is protected by the layer of its own oxide ?
Aluminium
97
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
98
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).
99
Wrought iron is a suitable material of construction for handling __________ solutions.
alkalis & alkaline
100
Steel rods are used in reinforced concrete to increase its __________ strength.
tensile
101
Corrosion involves exchange of electrons in __________ corrosion.
chemical
electrochemical
both (a) & (b)
102
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.
103
Which of the following has the least value of ultimate tensile strength (UTS) ?
Cast iron
104
__________ does not contain tin as an alloying material.
Brass
105
A metallic alloy in general as compared to their pure metal components is
more corrosion resistant.
106
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.
107
The increase in hardness of metal due to its cold working is termed as the __________ hardening.
work
108
Copper is dissolved from its ore by H2SO4 in a percolation tank made of
reinforced concrete lined with lead
109
Bearings subjected to light load are made of
phosphorous bronze
110
Softening of hardned steel is done by its
tempering
111
Maximum permissible sulphur content in steel is __________ percent.
0.055
112
Ceramic materials fabrication can not be done by
welding
113
Which has the maximum melting point out of the following ?
Wrought iron
114
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)
115
Which of the following has no effect on the carbide forming tendency in steels ?
Phosphorus
116
Approximate value of the modulus of elasticity for steel is about __________ x l0^6kg/cm2.
2
117
Carbon is present in steel wholly in the
combined form.
118
Carbon supply in pack carburising process is in the form of
charcoal
119
In SO3 absorber (Contact Process), packing material used is of
chemical stoneware
120
Presence of manganese in alloy steel improves its
abrasion resistance & toughness.
121
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
lead or acid-proof bricks
122
A material is called 'ductile', if it can be
drawn into wires.
123
Evaporator used for concentrating tomato juice is made of
stainless steel-glass lined
124
High carbon steel contains more than __________ percent carbon.
0.5
125
The main constituent of carborundum is __________ carbide.
silicon
126
For storing water and acid free benzol, use a __________ vessel.
steel
127
The chlorinator used in the manufacture of DDT is made of
glass lined steel
128
Reduction in the grain size reduces the __________ of the material.
creep resistance
129
Age hardening is concerned with
duralumin
130
Which of the following undergoes granular fracture ?
Steel
131
Ball bearings are normally made of __________ steel.
chrome
132
The electrical conductivity of a __________ decreases with rise in temperature.
metal/alloy
133
Which one occupies the lowermost position in the electromotive series of metals ?
Noble metals (Ag, Pt, Au)
134
Addition of nickel to copper improves its
hardness
135
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
bismuth
136
High speed cutting tool steels contain about __________ percent of tungsten.
18-20
137
The 'bomb' in the bomb calorimeter is made of
molybdenum stainless steel
138
The crystal structure of most of the common metals is
cubic
139
Telfon (PTFE) is corroded by
none of these
140
Hastelloy C is a good material of construction in chemical process industry, since it is
light and resists attack by acids.
141
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
cast iron
142
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.
143
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.
144
The specific gravity of coal depends mainly on its __________ content.
ash
145
Carbon percentage is the same in cast iron and
pig iron
146
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.
147
.
Which of the following has the highest density and the lowest melting point ?
Lead
148
In order to be called steel, an alloy should have iron percentage greater than
80
149
Nickel is a constituent of
monel metal
150
Soap kettle used in the production of laundry soap is made of
steel with top section nickel clad or stainless steel
151
Nickel made/clad equipments are suitable for handling
fruit juices, milk & its products and caustic soda solution.
152
Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
copper
153
The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
normalising
154
In hot wire aneomometer used for gas flow measurement, the wire is normally made of
platinum
155
Mild steel is used for making
channels
156
Presence of 0.3 to 0.5% arsenic in copper increases its
tenacity & hardness
157
The heat treatment process applied to cold formed steel parts is
solution annealing
158
The largest consumption of zinc for alloys is in the making of
brasses
159
Plate and frame filter press is usually made of
cast iron
160
Nickel and copper are the basic constituents of
monel metal
160
Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
rubber or durmet-20 lined
161
Nickel and copper are the basic constituents of
monel metal
162
Copper has very low
tensile strength
163
Hardest material so far found is
diamond
164
Most suitable material of construction for the storage of concentrated nitric acid is
aluminium or chromium alloys (Cr > 18% for cold acid)
165
The most resistant material to alkaline corrosion is
nickel
166
Tin coating is not done by
vaporising
167
Stainless steel is not corroded by
nitric acid (10%).
168
__________ is added in stainless steel to prevent inter crystal corrosion.
Niobium
169
Nickel is a __________ material.
ferromagnetic
170
Babbit metal is not a
pure metal
171
Which of the following alloys does not contain nickel ?
Babbit metal
172
Which of the following is the lightest of engineering metals ?
Magnesium
173
Evaporators used in caustic soda recovery and production plant are made of
monel metal
174
With increase in carbide/graphite ratio in cast iron, its
hardness & brittleness increases.
ductility decreases.
both (a) and (b).
175
The fermentor used in the production of pencillin (by deep fermentation process) is made of
glass lined steel
176
Nickel (76%) and chromium (15%) alloys are termed as
inconel
177
Low carbon steels are those in which carbon percentage is around
0.1 to 0.35
178
White metal is an alloy of
none of these
179
The carbonating tower used in Solvay process of soda ash manufacture is made of
cast iron
180
For platinum thermocouples, lead wires are made of
copper & copper-nickel alloys.
181
High resistance electrical heating elements/wire are not made of
marageing steel
182
Which one is remelted and poured into moulds to get cast iron ?
Pig iron
183
Wood metal is not used for making
storage tank for storing brine and caustic soda.
184
An ideal material of construction for the storage of 50% caustic soda solution would be
monel
185
Which of the following is the hardest ?
Austenite
186
Which of the following alloy steels is the most suitable for making gun barrels and projectiles ?
Nickel-chrome steel
187
The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
sintering
188
Sulphuric acid pickling tanks are lined with
rubber
189
Valves in pipe size of 2" and under are normally made of
brass
190
Ceramic materials are
stronger in compression than in tension
191
Which is an amorphous material ?
Glass
192
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of
cast iron
193
Platinum and silver are corroded by
none of these
194
Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium
tin, nickel, iron and chromium
195
The material used in the filament of electric bulbs is
tungsten
196
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
flanges
197
Caustic soda can be stored in __________ drums.
steel
198
Work hardening of a material
decreases its ductility.
199
Wrought iron is
malleable & ductile; and hence is used for chain links, hooks & couplings.
200
Perspex is nothing but
acrylic sheet
201
Centrifugal pump made of pyrex or glass can't be used to pump
alkaline solutions.
201
Ability of a material to __________ is indicated by its damping capacity.
absorb vibration
202
Corrosion resistance of steel is increased by the addition of
nickel and chromium.
203
Hydrochloric acid is __________ corrosive to common metals.
highly
204
Tank furnace used for melting of glass is made of
refractory blocks
205
Spray dryer for evaporating milk to produce milk powder is made of
stainless steel
206
stainless steel
nickel and chromium.
207
Which of the following is not an alloy of nickel and chromium ?
Duralumin
208
Thermoplastic resins are those polymers, which
easily deform under pressure at high temperature.
209
The temperature at which new grains are formed in the metal is called the __________ temperature.
recrystallisation
210
Molten phthalic anhydride is stored in a/an __________ vessel.
aluminium
211
Fatigue failure of a material results from __________ stress.
fluctuating
212
Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel
glass
213
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.
214
Ability of a material to absorb energy in deformation in the plastic range is characterised as its
toughness
215
Monel alloy is
used for making steam valves and turbine blades as it resists steam attack at high temperature.
216
Molybdenum steels containing 0.15 to 0.40% molybdenum
are used for automobile parts like gears, axle, shaft, bearings etc.
217
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).
218
Presence of high amount of silicon in cast iron
increases the formation of graphite.
219
Rubber lined pumps can be used to pump
caustic soda
chlorinated brine
hypochlorous acid
all (a), (b) and (c)
220
Titanium metal
is used in oceanographic and space exploration applications.
221
Purity of electrical grade aluminium should be ≥ __________ percent.
99.5
222
Maximum consumption of zinc is in
galvanising
223
Hardest materials so far found is
diamond
224
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
sheradising
225
Which of the following commercial metals is most abundantly found in India ?
Aluminium
226
Tin vessels are corroded by
none of these
227
Out of the following, copper vessels are the most suitable for the storage of
dry chlorine & dry fluorine.
228
Tempering of steel is done to make it
soft
229
Concrete tank can be used to store
saturated brine
230
Zinc is highly __________ at room temperature.
resistant to atmospheric corrosion
231
Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property ?
Silicon
232
Most common stainless steel type 316, which is highly resistant to corrosion contains
16-13% Cr 10-14% Ni and 2-3% Mo.
233
Sheardising process is used for
surface coating.
234
The maximum percentage of chromium that can be added to steel is about
18
235
Which of the following is a non-magnetic material ?
Zinc
236
An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
constantan
237
The material of construction of pressure mills used for squeezing out the juice from sugar cane is
cast iron
238
Rotary driers are generally made of
mild steel
239
Presence of high phosphorous in cast iron increases its
fluidity
240
The phenomenon in which slow extension of material takes place with the time at constant load is called
creep
241
A material capable of undergoing large permanent deformation, when subjected to compression is termed as
malleable
242
__________ is used for examining the macro-structure of a material.
Visual inspection by naked eye
243
