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PROB SOLVING PBE > (4) Materials and Construction > Flashcards

(4) Materials and Construction Flashcards

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.

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2
Q

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

A

-fire clay

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3
Q

Which of the following is universally employed as the low expansion metal in the bimetallic thermometer, which is an iron-nickel alloy containing 36% nickel and has very low co-efficient of expansion (l/20th of ordinary metals) ?
-Invar
-Constantan
-Chromel
-Alume

A

Invar

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4
Q

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

A

toughness

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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.

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6
Q

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

A

-silicon carbide.

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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

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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

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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.

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10
Q

The melleability of a material is the property by virtue of which it can be rolled or hammered into thin sheets. Which of the following materials has the miximum malleability ?
-Lead
-Copper
-Aluminium
-Wrought iron

A

Lead

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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.

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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

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13
Q

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

A

iron

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14
Q

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

A

hastealloy C

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15
Q

Lead pipes are not safe for carrying drinking water because water containing dissolved oxygen attacks lead thereby forming poisonous Pb (OH)2. Lead pipes are readily corroded by
-dilute HCI
-acetic acid
-concentrated H2SO4
-none of these

A

-acetic acid

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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.

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17
Q

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

A

cobalt

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18
Q

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

A

corrosion

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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).

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20
Q

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

A

-steel

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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.

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22
Q

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

A

corrundum

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23
Q

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

A

-ductility

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24
Q

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

A

-lead or glass

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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 process
-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
58
Wood is corroded by -hydrochloric acid -SO2 (dry or wet) -chlorine (dry or wet) -all (a), (b) and (c)
-all (a), (b) and (c)
59
Brass is an alloy of -nickel and tin -copper and zinc -tin and lead -copper, nickel and zinc
-copper and zinc
60
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.
61
Photographic plates are coated with -silver nitrate -silver halide -calcium silicate -metallic silver
-silver halide
62
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.
63
Locomotive boiler tubes are made of __________ alloys. -arsenic copper -magnesium -aluminium -nickel
-arsenic copper
64
Slow and progressive deformation of a material with time under constant stress is called -creep -erosion -resilience -none of these
-creep
65
Which of the following heat treatment processes is used for softening the hardened material ? -Normalising -Tempering -Annealing -None of these
-Tempering
66
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).
67
Mercury is transported in metal containers made of -aluminium -iron -lead -nickel
-iron
68
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
69
Which of the following has the least carbon percentage ? -Low carbon steel -Mild steel -Wrought iron -White cast iron
-Wrought iron
70
The range of Mho's scale of hardness is from l to l5 l to 8 l to10 0 to 10
l to10
71
Which of the following pairs of elements may form an alloy ? -Iron & carbon -Iron & mercury -Platinum & mercury -None of these
Iron & carbon
72
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.
73
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
74
The preferred material of construction for storage tanks for 98% sulphuric acid is -aluminium -lead -stainless steel 316 -mild steel
-lead
75
The fermentor used for the production of ethyl alcohol from molasses is made of -wood -concrete -copper bearing steel -procelain
-copper bearing steel
76
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.
77
Cermets are used for making -cutting tools -abrasives -both (a) & (b) -neither (a) nor (b)
both (a) & (b)
78
The formation of oxide film on a metal due to atmospheric exposure reduces its -toughness -stiffness -creep limit -all (a), (b) & (c)
-creep limit
79
A hardened steel essentially contains -sorbite -troostite -martensite -none of these
-martensite
80
Which one contains the least percentage of carbon ? -Wrought iron -High speed steel -Cast iron -Pig iron
-Wrought iron
81
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
82
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.
83
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.
84
Which of the following is not a copper based alloy with nickel ? -German silver -Monel metal -Inconel -Constantan
Inconel
85
Which of the following alloys does not contain nickel ? -Chlorinet - 2 alloy -Monel -Inconel -Babbit metal
Babbit metal
86
An elastic behaviour of materials is expressed in terms of -hysterisis loop area -stress-strain curve -relaxation time -none of these
-relaxation time
87
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.
88
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
89
Which of the following is not an alloy of copper and tin ? -Bell metal -Gun metal -Admiralty gun metal -Monel metal
Monel metal
90
__________ is never shipped in glass carboys. -Ammonia -Acetic acid -Phenol -Formaldehyde
-Ammonia
91
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.
92
Nitriding of steel is done (in electric furnace) at __________ °C. 510 1720 2210 910
510
93
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.
94
The softest material just next to talc in the Mhos scale is -quartz -gypsum -feldspar -fluorite
-gypsum
95
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
96
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
97
Aluminium storage vessel can be used to store -aqua regia -ferrous sulphate -hydrochloric acid (10%) -none of these
-none of these
98
Silicone rubber is not resistant to the corrosive action of -sulphuric acid (10%) -sulphuric acid (95%) -ether -both (b) and (c)
-both (b) and (c)
99
Which metal is protected by the layer of its own oxide ? -Iron -Silver -Calcium -Aluminium
-Aluminium

PROB SOLVING PBE (11 decks)

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