Materials and Construction MCQs : This section focuses on the "Materials and Construction". These Multiple Choice Questions (MCQs) should be practiced to improve the Materials and Construction skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.
Question 1
18/8 steel is a/an __________ stainless steel.
A. austenitic
B. ferritic
C. martensitic
D. none of these
Question 2
18-4-1 high speed steel contains 18%, 4% and 1% respectively of
A. tungsten, vanadium and chromium
B. tungsten, chromium and vanadium
C. vanadium, chromium and tungsten
D. chromium, tungsten and vanadium
Question 3
A suitable material of construction to use with fuming sulphuric acid is
A. carbon steel
B. stainless steel type 304
C. nickel
D. monel
Question 4
Acetylene gas holder is made of
A. copper
B. cast iron
C. steel
D. monel metal
Question 5
Addition of __________ in steel can help in increasing the depth of hardness.
A. nickel
B. chromium
C. vanadium
D. tungsten
Question 6
Addition of __________ to the steel helps in increasing the residual magnetism in steel used for making magnets.
A. chromium
B. nickel
C. tungsten
D. cobalt
Question 7
Aluminium as a material of construction suffers from the disadvantage of
A. very high cost.
B. rather low tensile strength.
C. very low strength to weight ratio.
D. scarce availability.
Question 8
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
A. 1.5-2
B. 3.5-4.5
C. 07-Sep
D. Dec-14
Question 9
Babbit metal used for bearings is a____base alloy.
A. tin
B. lead
C. aluminium
D. copper
Question 10
Cast iron has very high
A. compressive strength
B. ductility
C. shock resistance
D. resistance to brittleness
Question 11
Cast irons are generally specified by their
A. carbon content
B. tensile strength
C. hardness
D. manufacturing proces
Question 12
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
A. moving mercury and graphite.
B. graphite and moving mercury.
C. moving mercury and carbon.
D. moving mercury and crimped steel wire.
Question 13
Cementite is
A. Fe3C chemically.
B. a compound of carbon and iron.
C. characterised by an orthorhombic crystal structure.
D. all (a), (b) and (c).
Question 14
Ceramic recuperators are generally made of
A. silicon carbide.
B. calcium carbide.
C. fireclay bricks.
D. high alumina bricks.
Question 15
Cermets are __________ materials.
A. refractory
B. reinforced
C. abrasive
D. fully metallic
Question 16
Chlorination of benzene is done to produce benzene hexachloride (a pesticide) in a photochemical reactor lined with
A. karbate
B. lead or glass
C. fireclay bricks
D. PVC
Question 17
Coke oven regenerators are made of __________ bricks.
A. fire clay
B. silica
C. low thermal conductivity
D. high electrical conductivity
Question 18
Constantan is an alloy of
A. Cu (55%) & Sn (45%).
B. Cu (55%) & Ni (45%).
C. Pt (95%) & Rh (10%).
D. Fe (80%) & Ni (20%).
Question 19
Constituents of stellite are
A. zinc, copper and nickel.
B. cobalt, chromium and tungsten.
C. zinc, aluminium and nickel.
D. nickel, cobalt and vanadium.
Question 20
Dielectric strength of a material is
A. its energy stroage capacity.
B. a magnetic property.
C. its capacity to resist the flow of current.
D. its capacity to withstand high voltage.
Question 21
Galvanised iron is
A. harder
B. protected from rusting
C. alumina coated iron
D. none of these
Question 22
German silver in an alloy of
A. copper, nickel and zinc.
B. copper, aluminium and silver.
C. silver, zinc and aluminium.
D. silver, nickel and zinc.
Question 23
German silver used for decorative purposes contains maximum percentage of
A. silver
B. copper
C. zinc
D. nickel
Question 24
Hammers and railway rails are normally made of
A. mild steel
B. dead mild steel
C. medium carbon steel
D. high carbon steel
Question 25
Heavy duty bearings are usually made of
A. white metal
B. phosphorous bronze
C. monel
D. zinc
Question 26
Invar used in thermocouples is an alloy of nickel and
A. iron
B. copper
C. chromium
D. lead
Question 27
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. dilute HCI
B. acetic acid
C. concentrated H2SO4
D. none of these
Question 28
Liquid ammonia is shipped in __________ containers.
A. steel
B. aluminium
C. glass
D. lead lined
Question 29
Nickel (56%) and molybdenum (17%) alloys are called
A. monel
B. hastealloy C
C. inconel
D. bronzes
Question 30
Percentage elongation of a material is a measure of its
A. ductility
B. brittleness
C. toughness
D. malleability
Question 31
Presence of nickel in steel improves its
A. corrosion resistance.
B. cutting ability.
C. wear resistance.
D. all (a), (b) and (c).
Question 32
Refined acetic acid storage vessel are made of
A. copper
B. aluminium
C. high carbon steel
D. nickel
Question 33
Residual magnetism in steel for magnets is increased by the addition of
A. nickel
B. cobalt
C. tungsten
D. chromium
Question 34
Shock resisting steels should possess high
A. hardness
B. toughness
C. tensile strength
D. wear resistance
Question 35
Softness of silver can be converted into hardness by alloying it with small quantity of
A. copper & nickel
B. zinc
C. aluminium
D. tin
Question 36
Sulphur melting pit in the sulphuric acid plant is made of
A. lead lined stainless steel.
B. cast iron.
C. steel or cement-brick lined.
D. hard wood.
Question 37
The addition of antimony in tin-based alloys improves its
A. rupture strength and hot hardness.
B. impact strength and bonding strength.
C. deformation resistance.
D. wear resistance.
Question 38
The behaviour of visco-elastic material is time dependent. This behaviour is common in __________ materials.
A. non-crystalline solid
B. crystalline
C. rubberry
D. non-crystalline organic polymeric.
Question 39
The hardest material just prior to diamond in Mho's scale is
A. topax
B. carborundum
C. corrundum
D. calcite
Question 40
The impure iron (pig iron) that is tapped out from blast furnace contains about __________ percent carbon.
A. 0.2
B. 2
C. 4
D. 8
Question 41
The main purpose of galvanising iron sheets is to
A. harden the surface.
B. increase its glossiness and lustre.
C. prevent the action of water.
D. prevent the action of oxygen.
Question 42
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
B. Copper
C. Aluminium
D. Wrought iron
Question 43
The metals occuring at the lower most position in the electromotive series
A. do not resist corrosion.
B. resist corrosion very strongly.
C. are very brittle.
D. are heat insulators.
Question 44
The purpose of nitriding the steel is to
A. harden its surface.
B. soften its surface.
C. improve its reliability.
D. none of these.
Question 45
Which of the following crystal structures characterises the austenitic stainless steel?
A. Simple hexagonal
B. Body centred cubic
C. Face centred cubic
D. None of these
Question 46
Which of the following has the highest compressive strength ?
A. Wrought iron
B. Cast iron
C. Mild steel
D. High carbon steel
Question 47
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
B. Constantan
C. Chromel
D. Alumel
Question 48
Which of the following stainless steels is non-magnetic ?
A. Ferritic
B. Martensitic
C. Austenitic
D. None of these
Question 49
White cast iron is not
A. malleable
B. whitish in color
C. brittle
D. strong and hard
Question 50
Zinc is not used
A. for producing zinc base die casting alloys.
B. in its oxide form as pigments.
C. as anode for corrosion prevention in boiler.
D. as an alloying element in various bronzes.
Question 51
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
B. Constantan
C. Chromel
D. Alumel
Question 52
In drop forging process, the forging is done by dropping the __________ at high velocity.
A. Hammer
B. Workpiece
C. Die with hammer
D. Weight on hammer
Question 53
Most of the common metals have __________ crystal structure.
A. Cubic
B. Hexagonal
C. Orthorhombic
D. None of these
Question 54
Chrome vanadium steels usually contain 0.8 to 1.1% Cr, 0.25 to 0.35% C and < 0.25% V. It is
A. Used for making axle & shafts of aeroplanes, automobiles and locomotives
B. Having poor fatigue resistance
C. Having poor toughness
D. Not helpful in producing cleaner steel due to oxidising action of vanadium
Question 55
Liners of a ball mill are never made of
A. Lead
B. Alloy steel
C. Rubber or ceramic material
D. Cast iron
Question 56
Approximate value of the modulus of elasticity for steel is about __________ x l0⁶kg/cm².
A. 0.5
B. 2
C. 40
D. 75
Question 57
Which of the following constituents of cast iron is mainly responsible for imparting it an anti-corrosive property?
A. Silicon
B. Phosphorus
C. Sulphur
D. None of these
Question 58
An alloy used as thermocouple material comprises of 40% nickel and 60% copper. It is called
A. Constantan
B. Kanthal
C. Chromel
D. German silver
Question 59
Brinell Hardness Number (BHN) for talc is approximately in the range of
A. 1-5
B. 20-30
C. 100 -150
D. 200 - 250
Question 60
Rubber lined vessels are corroded by the action of
A. Aqua regia
B. Chloroform
C. Sulphuric acid (95%)
D. All of the above
Question 61
Pipes for bi-cycle frames are made of __________ steel.
A. Hot rolled
B. Chrome carbon
C. Cold rolled
D. Stainless
Question 62
Nickel and copper are the basic constituents of
A. Hastelloy
B. Monel metal
C. German silver
D. Inconel
Question 63
Nickel and molybdenum are the basic constituents of
A. Hastealloy
B. German silver
C. Inconel
D. Solder
Question 64
Nickel as a material of construction
A. Is used as an alloying element for both ferrous & non-ferrous alloys
B. Is paramagnetic below 415° C (its Curie temperature)
C. Dimagnetic
D. Has a body centred cubic (bcc) crystal lattice structure
Question 65
The increase in hardness of metal due to its cold working is termed as the __________ hardening.
A. Work
B. Age
C. Induction
D. Flame
Question 66
Balls in a ball mill are usually made of
A. Steel
B. Cast iron
C. Stainless steel
D. Bronze
Question 67
Concentrated HCl at 30°C can be stored in a vessel made of
A. PTFE and porcelain
B. Cast iron and aluminium
C. Stainless steel and high silicon cast iron
D. None of these
Question 68
Brine (15% concentration) can be stored in a vessel made of
A. Monel
B. Karbate
C. Cast iron
D. None of these
Question 69
A bearing metal should not have
A. Enough plasticity
B. Low thermal conductivity
C. Low co-efficient of friction
D. High toughness
Question 70
White cast iron as compared to grey cast iron is
A. More durable
B. Very brittle
C. Very hard
D. All of the above
Question 71
Which of the following is produced by condensation polymerisation?
A. Bakelite
B. Polythene
C. Poly vinyl chloride
D. Polystyrene
Question 72
Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.
A. Bismuth
B. Arsenic
C. Antimony
D. Both B and C
Question 73
Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.
A. Copper
B. Copper alloys
C. Stainless steel
D. Monel
Question 74
Dies for wire drawing are generally made of
A. Mild steel
B. Stainless steel
C. Carbides
D. High carbon steel
Question 75
High resistance electrical heating elements/wire are not made of
A. Marageing steel
B. Nimonic alloys
C. Kanthal wire
D. Nichrome
Question 76
The material used in the filament of electric bulbs is
A. Nichrome
B. Tungsten
C. Constantan
D. German silver
Question 77
The main purpose of galvanising iron sheets is to
A. Harden the surface
B. Increase its glossiness and lustre
C. Prevent the action of water
D. Prevent the action of oxygen
Question 78
Which of the following metals in not used for coating of the base metal to guard it against corrosion?
A. Lead
B. Cadmium
C. Magnesium
D. Aluminium
Question 79
__________ is a donor impurity for semi-conductors.
A. Boron
B. Antimony
C. Gallium
D. None of these
Question 80
Hydrochloric acid is stored in a __________ steel vessel.
A. Lead lined
B. Rubber lined
C. Glass lined
D. Stainless
Question 81
Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of
A. Wood
B. Stainless steel
C. Reinforced concrete lined with lead
D. High silicon iron (14% Si)
Question 82
Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
A. 0.02
B. 0.2
C. 0.35
D. 0.5
Question 83
Alpha iron is stable __________ °C.
A. Above 1403
B. Upto 910
C. Above 1800
D. Between 910 & 1403
Question 84
__________ iron is produced, when molten pig iron is allowed to cool gradually.
A. White cast
B. Grey cast
C. Wrought
D. None of these
Question 85
Which of the following is not a nickel based alloy?
A. Inconel
B. Hastelloys
C. Nimonics
D. Babbit metal
Question 86
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
A. Oxygen
B. Arsenic
C. Antimony
D. Bismuth
Question 87
Maximum consumption of lead is in the manufacture of
A. Storage batteries
B. Solder alloys
C. Electric cable sheathing
D. Lead lined vessels
Question 88
Coke oven walls are lined with __________ bricks.
A. Silica
B. Tar-dolomite
C. Low thermal conductivity
D. Fire clay
Question 89
Babbit metal (used for making bearings) comprises of
A. Mainly tin (85%) and lead
B. Saw dust and iron dust mixture
C. Zinc and aluminium
D. Copper and aluminium
Question 90
The chlorinator used in the manufacture of DDT is made of
A. Glass
B. Glass lined steel
C. Teflon
D. Bakelite
Question 91
Carbon percentage in medium carbon steel is around
A. 0.1 to 0.35
B. 0.35 to 0.5
C. 0.8 to 1.4
D. 1 to 1. 5
Question 92
Addition of nickel to copper improves its
A. Machinability
B. Ductility
C. Strength
D. Hardness
Question 93
__________ is not a case hardening process.
A. Carburising
B. Nitriding
C. Cyaniding
D. Annealing
Question 94
Gunmetal and bronze are not corroded by the action of
A. Wet chlorine
B. Synthetic detergent solution
C. Hydrochloric acid (10%)
D. Nitric acid (< 25%)
Question 95
Glass lined vessels are not used for handling/storing
A. Dilute H₂SO₄
B. Dilute HNO₃
C. Dilute HCl
D. Hydroflouric acid
Question 96
Pick the odd man out of the following.
A. Calorising
B. Pack carburising
C. Nitriding
D. Cyaniding
Question 97
For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
A. Stainless steel
B. Cast iron
C. Aluminium
D. Nickel
Question 98
Percentage of silver in German silver is
A. 5
B. 10
C. 20
D. 0
Question 99
Sulphuric acid pickling tanks are lined with
A. Nickel
B. Rubber
C. Aluminium
D. Glass
Question 100
__________ iron is produced, when molten pig iron is chilled suddenly.
A. White cast
B. Grey cast
C. Wrought
D. None of these
Question 101
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. Dilute HCI
B. Acetic acid
C. Concentrated H₂SO₄
D. None of these
Question 102
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
A. Dilute HC₁
B. Acetic acid
C. v
D. None of these
Question 103
To improve the machinability of steel by its softening, it is subjected to
A. Cold working
B. Annealing
C. Shot blasting
D. Heating
Question 104
Which of the following is the most widely used insulating material for steam carray-ing pipelines?
A. Ceramic fibre blanket
B. Glass wool and 85% magnesia
C. Vermiculite
D. Slag wool
Question 105
18/8 stainless steel means, that it contains
A. 18% chromium and 8% nickel
B. 18% chromium and 8% molybdenum
C. 18% nickel and 8% chromium
D. 18% molybdenum and 8% chromium
Question 106
Lead alone is not used in storing equipment, because it
A. Is very costly
B. Corrodes easily
C. Is having low creep strength
D. None of these
Question 107
Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
A. Nickel
B. Copper
C. Stainless steel
D. Brass
Question 108
High speed steel tools retain their hardness upto a temperature of __________ °C.
A. 500
B. 750
C. 900
D. 1100
Question 109
The material of construction of pressure mills used for squeezing out the juice from sugar cane is
A. Stainless steel
B. Cast iron
C. Mild steel
D. Monel
Question 110
Which of the following has the least carbon percentage?
A. Low carbon steel
B. Mild steel
C. Wrought iron
D. White cast iron
Question 111
The addition of antimony in tin-based alloys improves its
A. Rupture strength and hot hardness
B. Impact strength and bonding strength
C. Deformation resistance
D. Wear resistance
Question 112
The heat treatment process applied to cold formed steel parts is
A. Normalising
B. Tempering
C. Artificial ageing
D. Solution annealing
Question 113
The softest material just next to talc in the Mho's scale is
A. Quartz
B. Gypsum
C. Feldspar
D. Fluorite
Question 114
__________ can replace tungsten in high speed steel,
A. Chromium
B. Vanadium
C. Cobalt
D. Molybdenum
Question 115
Which of the following undergoes granular fracture?
A. Wrought iron
B. Steel
C. Cast iron
D. None of these
Question 116
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?
A. Silicon steel
B. Chromium steel
C. Molybdenum steel
D. None of these
Question 117
Steel tower used for the storage of oleum
A. Is lined with lead
B. Need not be lined
C. Is lined with rubber
D. Is lined with acid-proof bricks
Question 118
Iron alloyed with carbon upto 2% is called
A. Pig iron
B. Wrought iron
C. High carbon steel
D. None of these
Question 119
Gas holder of a gobar (cowdung) gas plant is made of
A. Molybdenum stainless steel
B. Tin
C. Mild steel
D. Aluminium
Question 120
Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
A. Fully crystalline
B. Partly crystalline
C. Amorphous
D. None of these
Question 121
In SO₃ absorber (Contact Process), packing material used is of
A. Cast iron
B. Chemical stoneware
C. Karbate
D. Mild steel
Question 122
To improve the machinability of steel, it is generally subjected to
A. Spheroidising
B. Tempering
C. Normalising
D. Annealing
Question 123
In hot wire aneomometer used for gas flow measurement, the wire is normally made of
A. Copper
B. Platinum
C. Constantan
D. Chromium
Question 124
A magnetic material becomes __________ above the Curie temperature.
A. Ferromagnetic
B. Diamagnetic
C. Paramagnetic
D. None of these
Question 125
Hydrochloric acid is __________ corrosive to common metals.
A. Least
B. Not
C. Mildly
D. Highly
Question 126
Nickel base alloys with __________ are known as monel metal.
A. Zinc
B. Tin
C. Copper
D. Molybdenum
Question 127
The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement.
A. Brass for low
B. Nickel alloys for high
C. Both A & B
D. Aluminium for all
Question 128
A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.
A. Zinc
B. Mercury
C. Lead
D. Tin
Question 129
The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
A. Precipitation
B. Fusion
C. Sintering
D. Agglomeration
Question 130
Zinc is highly __________ at room temperature.
A. Ductile
B. Resistant to atmospheric corrosion
C. Malleable
D. Brittle
Question 131
Brine solution is stored/treated in __________ lined vessels/pipes.
A. Rubber
B. Lead
C. Glass
D. Nickel
Question 132
High speed cutting tool steels contain about __________ percent of tungsten.
A. 6-8
B. 18-20
C. 30-35
D. 50-55
Question 133
Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel
A. Rubber
B. Monel
C. Glass
D. Nickel
Question 134
Austenitic manganese steel used for making jaws of crushing machines contains about __________ percent manganese.
A. 1.5-2
B. 3.5-4.5
C. 7-9
D. 12-14
Question 135
SO₃ is absorbed using H₂SO₄ in a
A. Cast iron packed tower
B. Stainless steel plate tower
C. Packed steel tower lined with acid proof bricks
D. None of these
Question 136
How many molecules per unit cell are there in a face centred cubic lettice?
A. 2
B. 4
C. 6
D. 8
Question 137
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
A. Ultimate tensile strength (U.T.S.)
B. Endurance limit
C. Elastic limit
D. None of these
Question 138
Acid proof stoneware
A. Has very low strength
B. Cannot be heated
C. Is broken by small temperature changes
D. All of the above
Question 139
Steel pipes are normally manufactured by __________ process.
A. Extrusion
B. Cold working
C. Forging
D. Electroforming
Question 140
Invar contains the highest percentage of
A. Vanadium
B. Iron
C. Tungsten
D. Cobalt
Question 141
The most distinguished property of malleable cast iron is its high
A. Ductility
B. Hardness
C. Malleability
D. None of these
Question 142
Which of the following is not an alloy of nickel and chromium?
A. Inconel
B. Hastealloy
C. Nimonic alloys
D. Duralumin
Question 143
Ball bearings are normally made of __________ steel.
A. High speed
B. High carbon
C. Chrome
D. Silicon
Question 144
Steel balls for ball bearings are generally made of __________ steel.
A. Cast
B. Stainless
C. Free carbon
D. Carbon chrome
Question 145
Clock pendulums are usually made of __________ steel.
A. High speed
B. Stainless
C. Heat resisting
D. None of these
Question 146
Presence of high amount of silicon in cast iron
A. Suppresses the decomposition of Fe₃ C
B. Increases the formation of graphite
C. Increases the contraction of the metal
D. Reduces its fluidity
Question 147
German silver is an alloy of copper, nickel and
A. Zinc
B. Silver
C. Tin
D. Lead
Question 148
Which of the following has the highest density and the lowest melting point?
A. Stainless steel
B. Titanium
C. Lead
D. Aluminium
Question 149
Valves in pipe size of 2" and under are normally made of
A. Wrought iron
B. Brass
C. Bronze
D. Monel
Question 150
Wrought iron is a suitable material of construction for handling __________ solutions.
A. Dilute acidic
B. Concentrated acidic
C. Alkalis & alkaline
D. None of these
Question 151
The preferred material of construction for storage tanks for 98% sulphuric acid is
A. Aluminium
B. Lead
C. Stainless steel 316
D. Mild steel
Question 152
Dilute sulphuric acid is transported in __________ pipes.
A. Mild steel
B. Lead
C. Copper
D. Special alloys
Question 153
Silicone rubber is not resistant to the corrosive action of
A. Sulphuric acid (10%)
B. Sulphuric acid (95%)
C. Ether
D. Both B and C
Question 154
With increase in carbide/graphite ratio in cast iron, its
A. Hardness & brittleness increases
B. Ductility decreases
C. Both A & B
D. Neither A nor B
Question 155
Locomotive boiler tubes are made of __________ alloys.
A. Arsenic copper
B. Magnesium
C. Aluminium
D. Nickel
Question 156
Beehive coke ovens are made of __________ bricks.
A. Silica
B. Fireclay
C. Silicon carbide
D. Corundum
Question 157
Cold worked steel parts are normally subjected to
A. Normalising
B. Hardening
C. Annealing
D. Shot peening
Question 158
In cold working of metal as compared to its hot working
A. Cracks and blow holes are eliminated
B. Ductility and impact strength improves
C. Appreciable strain hardening is produced
D. Yield stress, hardness and fatigue strength is not at all affected
Question 159
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
B. Copper
C. Aluminium
D. Wrought iron
Question 160
The electrical conductivity of a __________ decreases with rise in temperature.
A. Metal/alloy
B. Semi-conductor
C. Dielectric
D. None of these
Question 161
Tin coating on metals is not done by
A. Spraying
B. Powder metallurgy
C. Hot dipping
D. Electro-deposition
Question 162
An ideal material of construction for the storage of 50% caustic soda solution would be
A. Karbate
B. High silicon cast iron
C. Monel
D. None of these
Question 163
Babbit metal is not a
A. Tin base alloy
B. White metal
C. Lead base alloy
D. Pure metal
Question 164
Dry chlorine can be handled in a vessel made of
A. Iron or steel
B. PVC
C. Ickel
D. Brass
Question 165
Caustic soda can be stored in __________ drums.
A. Steel
B. Cast iron
C. Brass
D. Gun metal
Question 166
Vessels made of __________ can be used to store dry chlorine.
A. Thermoplastic materials
B. Nickel
C. Steel or iron
D. None of these
Question 167
Ball bearings are generally made of
A. Plain carbon steel
B. Chrome carbon steel
C. Stainless steel
D. Malleable cast iron
Question 168
Bell metal is an alloy of
A. Copper & zinc
B. Copper & tin
C. Copper & nickel
D. Zinc & tin
Question 169
Brass is an alloy of
A. Nickel and tin
B. Copper and zinc
C. Tin and lead
D. Copper, nickel and zinc
Question 170
Bush bearings are made of
A. Mild steel
B. Phosphorous bronze
C. White metal alloys
D. None of these
Question 171
Hydrochloric acid is stored in a__vessel.
A. Lead lined steel
B. Rubber lined steel
C. Stainless steel
D. Cast iron
Question 172
A material is called 'ductile', if it can be
A. Drawn into wires
B. Hammered to a thin sheet
C. Fractured without deformation
D. Made lustrous by heating it
Question 173
The maximum percentage of chromium that can be added to steel is about
A. 12
B. 18
C. 24
D. 30
Question 174
Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making
A. Nuts
B. Bolts
C. Chiesels
D. Studs
Question 175
Cast iron has
A. Very high tensile strenth
B. High ductility
C. High malleability
D. Elastic limit close to ultimate breaking strength
Question 176
Cast iron is
A. Used for making shock resisting parts
B. Manufactured in cupola and is brittle
C. Having compressive strength more than its tensile strength
D. All of the above
Question 177
Cast iron is having very high
A. Proximity between its elastic limit and ultimate breaking strength
B. Ductility
C. Tensile strength
D. All of the above
Question 178
Ability of a material to __________ is indicated by its damping capacity.
A. Withstand compression
B. Absorb vibration
C. Absorb shock
D. None of these
Question 179
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
A. Copper
B. Cast iron
C. Aluminium
D. High carbon steel
Question 180
Cementite is
A. Fe₃C chemically
B. A compound of carbon and iron
C. Characterised by an orthorhombic crystal structure
D. All of the above
Question 181
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
A. Shafts
B. Flanges
C. Gears
D. Shear blades
Question 182
How many atoms are there per unit cell in a body centred cubic lattice system?
A. 2
B. 3
C. 4
D. 6
Question 183
Ceramic materials
A. Are exemplified by clay and mica
B. Are poor electrical conductors due to lack of free electrons
C. Never exhibit polymorphism
D. All of the above
Question 184
Ceramic materials are
A. Organic in nature
B. Stronger in compression than in tension
C. Always amorphous in nature
D. Always bad heat conductors
Question 185
Cermets are used for making
A. Cutting tools
B. Abrasives
C. Both A & B
D. Neither A nor B
Question 186
Interchain forces are the weakest in case of
A. Plastics
B. Fibres
C. Elastomers
D. Both rubber & elastomers
Question 187
Low carbon steels are those in which carbon percentage is around
A. 0.1 to 0.35
B. 0.4 to 0.7
C. 0.8 to 1.5
D. 1.5 to 2
Question 188
Chilled iron castings are
A. Easily machinable
B. Soft on surface
C. Highly wear resistant
D. None of these
Question 189
Nickel is a __________ material.
A. Ferromagnetic
B. Diamagnetic
C. Paramagnetic
D. None of these
Question 190
Alinco, which is a aluminium-cobalt-nickel steel, is used for making
A. Surgical instruments
B. Powerful magnets
C. Chemical equipments
D. Boiler tubes
Question 191
Biological shield in a nuclear power reactor is made of
A. Concrete
B. Steel
C. Cadmium
D. Zircalloy
Question 192
The fermentor used for the production of ethyl alcohol from molasses is made of
A. Wood
B. Concrete
C. Copper bearing steel
D. Procelain
Question 193
The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
A. Tempering
B. Normalising
C. Annealing
D. None of these
Question 194
The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.
A. Non-crystalline solid
B. Crystalline
C. Rubberry
D. Non-crystalline organic polymeric
Question 195
Cast iron compared to steel is better in
A. Ductility
B. Fluidity & castability
C. Strength
D. Malleability
Question 196
H₂SO₄ (< 50% concentration) is corrosive to
A. Aluminium, mild steel, stainless steel, concrete & tin
B. Copper, cast iron & high silicon iron (14% Si)
C. Rubber (butyl and hard), silicone rubber & teflon
D. Glass, graphite, porcelain & stoneware
Question 197
Constantan is an alloy of
A. Cu (55%) & Sn (45%)
B. Cu (55%) & Ni (45%)
C. Pt (95%) & Rh (10%)
D. Fe (80%) & Ni (20%)
Question 198
Constituents of stellite are
A. Zinc, copper and nickel
B. Cobalt, chromium and tungsten
C. Zinc, aluminium and nickel
D. Nickel, cobalt and vanadium
Question 199
Polythene (low or high density) containers are not corroded by
A. Sulphuric acid (10%) at room temperature
B. Nitric acid (95%) at room temperature
C. Sulphur trioxide at 60°C
D. Any of these
Question 200
An alloy of iron containing 4% carbon is called
A. High carbon steel
B. Wrought iron
C. Mild steel
D. None of these
Question 201
__________ does not contain copper as an alloying element,
A. Nichrome
B. Manganin
C. Perminivar
D. Monel metal
Question 202
Copper has very low
A. Malleability
B. Ductility
C. Tensile strength
D. Thermal & electrical conductivity
Question 203
Bearings subjected to light load are made of
A. White metal
B. Phosphorous bronze
C. Monel
D. Silicon bronze
Question 204
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
A. Moving mercury and graphite
B. Graphite and moving mercury
C. Moving mercury and carbon
D. Moving mercury and crimped steel wire
Question 205
In the kraft (sulphate) process for the paper manufacture, the digestor is made of
A. Cast iron
B. Stainless steel
C. Karbate carbon
D. Wrought iron
Question 206
Which of the following is produced by addition polymerisation?
A. Polybutadiene
B. Phenol formaldehyde
C. Urea-formaldehyde
D. Dacron
Question 207
Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
A. Plain carbon steel
B. Stainless steel
C. Rubber or durmet-20 lined
D. Lead
Question 208
Wood metal is not used for making
A. Soft solder
B. Casting for dental work
C. Storage tank for storing brine and caustic soda
D. Fusible safety plug for pressure cooker
Question 209
Evaporators used in caustic soda recovery and production plant are made of
A. Monel metal
B. Gun metal
C. Wood metal
D. Babbit metal
Question 210
Silicon percentage in acid resistant cast iron is about
A. 4
B. 8
C. 14
D. 20
Question 211
The temperature at which new grains are formed in the metal is called the __________ temperature.
A. Eutectic
B. Recrystallisation
C. Upper critical
D. Lower critical
Question 212
A material capable of undergoing large permanent deformation, when subjected to compression is termed as
A. Malleable
B. Ductile
C. Brittle
D. None of these
Question 213
Plasticisers are added to polymers to improve their
A. Tensile strength
B. Softness & flexibility
C. Acid resistance
D. Alkali resistance
Question 214
DDT is shipped in
A. Stainless steel containers
B. Paper bags
C. Fibre drums
D. Either B or C
Question 215
Age hardening' of duralumin is due to
A. Copper
B. Magnesium
C. Both A & B
D. Neither A nor B
Question 216
The ability of a material to offer resistance to scratching or indentation is a measure of its
A. Brittleness
B. Toughness
C. Hardness
D. Resilience
Question 217
Cast iron has
A. High ductility
B. High malleability
C. Very high tensile strength
D. Its elastic limit very close to ultimate breaking strength
Question 218
Hardest materials so far found is
A. Diamond
B. Graphite
C. Carborundum
D. Pumice stone
Question 219
Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of
A. Cast iron
B. Stainless steel or glass lined vessel
C. Karbate
D. Wrought iron
Question 220
Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of
A. Stainless steel or glass lined steel
B. Nickel clad steel
C. High silicon cast iron
D. Aluminium
Question 221
Galvanising is not a zinc diffusion process. A zinc diffusion process is termed as
A. Sheradising
B. Parkerising
C. Anodising
D. None of these
Question 222
Nitriding of steel is a process for
A. Case hardening
B. Spheroidising
C. Normalising
D. Annealing
Question 223
The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called
A. Bauschinger effect
B. Hooke's effect
C. Hysterisis
D. Relaxation
Question 224
Duralumin is an alloy of
A. Aluminium, copper and manganese
B. Aluminium, nickel and silicon
C. Aluminium and nickel
D. None of these
Question 225
Duriron is
A. Acid resistant, brittle and very hard
B. High silicon iron
C. Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
D. All of the above
Question 226
Which of the following is a light alloy?
A. Monel metal
B. Dow metal
C. German silver
D. Babbit metal
Question 227
Which of the following has no effect on the carbide forming tendency in steels?
A. Molybdenum
B. Phosphorus
C. Chromium
D. Vanadium
Question 228
Which of the following has a very high carbide forming tendency in steels?
A. Silicon
B. Chromium
C. Nickel
D. Vanadium
Question 229
In order to be called steel, an alloy should have iron percentage greater than
A. 80
B. 70
C. 90
D. 50
Question 230
Carbon percentage is the same in cast iron and
A. Wrought iron
B. Pig iron
C. Mild steel
D. High silicon (14%) iron
Question 231
Which one contains the least percentage of carbon?
A. Wrought iron
B. High speed steel
C. Cast iron
D. Pig iron
Question 232
Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
A. Beryllium
B. Manganese
C. Copper
D. Iron
Question 233
The purpose of nitriding the steel is to
A. Harden its surface
B. Soften its surface
C. Improve its reliability
D. None of these
Question 234
Acetaldehyde is produced by hydration of acetylene in a sulphuric acid solution of mercuric sulphate. Hydration tower is made of
A. Rubber lined mild steel
B. Lead lined mild steel
C. Aluminium
D. Cast iron
Question 235
Pick out the wrong statement
A. Hardening makes the steel more brittle
B. High alloy steels contain more than 50% alloying element
C. 18/8 stainless steel is a magnetic steel
D. Both B and C
Question 236
A material capable of undergoing large permanent deformation, when subjected to tension is termed as
A. Friable
B. Ductile
C. Brittle
D. None of these
Question 237
Which one occupies the lowermost position in the electromotive series of metals?
A. Aluminium
B. Noble metals (Ag, Pt, Au)
C. Zinc
D. Alkali metals (K, Na, Li)
Question 238
Carbon is present in the uncombined (graphitic) form in case of
A. Cast iron
B. Steel
C. Ferroalloy
D. None of these
Question 239
__________ moulding process can not be used for thermoplastic plastics.
A. Compression
B. Extrusion
C. Injection
D. None of these
Question 240
Carbon tetrachloride can be stored in a storage vessel made of
A. High silicon iron (14% Si)
B. Tin
C. Stainless steel
D. All of the above
Question 241
100% H₂SO₄ at 30°C can't be stored in a vessel made/lined with
A. Cast iron and high silicon iron
B. Mild steel and stainless steel
C. Aluminium, tin and rubber
D. Teflon, glass and porcelain
Question 242
Mercury is transported in metal containers made of
A. Aluminium
B. Iron
C. Lead
D. Nickel
Question 243
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%)?
A. Armature of small motors/generators
B. Generators and small motors
C. Induction motors
D. High frequency transformers
Question 244
Nickel made/clad equipments are suitable for handling
A. Ammonia (both aqueous & anhydrous)
B. Fruit juices, milk & its products and caustic soda solution
C. Nitric acid & hydrochloric acid (conc)
D. Sulphuric acid (conc)
Question 245
Slow and progressive deformation of a material with time under constant stress is called
A. Creep
B. Erosion
C. Resilience
D. None of these
Question 246
Which of the following is not used as the ceramic material in 'cermets'?
A. Silicides
B. Oxides
C. Carbides
D. Nitrides
Question 247
The most resistant material to alkaline corrosion is
A. Duriron
B. Nickel
C. Aluminium
D. Karbate
Question 248
__________ possesses viscoelastic properties.
A. Cork
B. Glass
C. Graphite
D. Rubber
Question 249
Fatigue failure of a material results from __________ stress.
A. Tensile
B. Compressive
C. Fluctuating
D. None of these
Question 250
__________ is added in stainless steel to prevent inter crystal corrosion.
A. Vanadium
B. Niobium
C. Chromium
D. Nickel
Question 251
__________ is never shipped in glass carboys.
A. Ammonia
B. Acetic acid
C. Phenol
D. Formaldehyde
Question 252
Neutraliser tank used for reacting nitric acid with ammonia for the production of ammonium nitrate is made of
A. Aluminium
B. Stainles steel
C. High silicon (14%) iron
D. Copper
Question 253
Trough of an apron conveyor is made of
A. Lead lined concrete vessel
B. Wood
C. Metal
D. Either B or C
Question 254
Presence of cobalt in steel improves its
A. Cutting ability
B. Corrosion resistance
C. Tensile strength
D. None of these
Question 255
Most suitable material of construction for the storage of concentrated nitric acid is
A. Cast iron
B. Monel
C. Karbate
D. Aluminium or chromium alloys (Cr > 18% for cold acid)
Question 256
Which of the following pairs of elements may form an alloy?
A. Iron & carbon
B. Iron & mercury
C. Platinum & mercury
D. None of these
Question 257
The damage/deterioration of metals by the __________ action of fluids is called 'erosion'.
A. Abrasive
B. Corrosive
C. Both A & B
D. Neither A nor B
Question 258
Pick out the wrong statement.
A. Wrought iron contains about 0.02% carbon
B. Wrought iron can not be easily forged and welded
C. The chilled cast iron does not contain graphite
D. Spheroidal grey cast iron contains graphite flakes
Question 259
Softening of hardned steel is done by its
A. Normalising
B. Tempering
C. Annealing
D. Carburising
Question 260
The crystal structure of most of the common metals is
A. Orthorhombic
B. Cubic
C. Hexagonal
D. None of these
Question 261
Presence of nickel in steel improves its
A. Corrosion resistance
B. Cutting ability
C. Wear resistance
D. All of the above
Question 262
Ceramic materials fabrication can not be done by
A. Welding
B. Slip casting
C. Extrusion
D. Plastic pressing
Question 263
Aluminium as a material of construction suffers from the disadvantage of
A. Very high cost
B. Rather low tensile strength
C. Very low strength to weight ratio
D. Scarce availability
Question 264
The largest consumption of zinc for alloys is in the making of
A. Bearing metal
B. Brasses
C. Brazing solder
D. Die casting alloys
Question 265
Which of the following is a non-magnetic material?
A. Cobalt
B. Zinc
C. Nickel
D. None of these
Question 266
Pick out the wrong statement.
A. Bronze is an alloy of copper & tin
B. Brass is an alloy of copper & zinc
C. The alloy named 'German silver' does not contain any silver
D. The ability of a material to fracture without appreciable deformation is called its ductility
Question 267
Carbon is present in the combined form (carbide) in case of
A. Pig iron
B. Steel
C. Ferroalloys
D. All of the above
Question 268
Rubber lined pumps can be used to pump
A. Caustic soda
B. Chlorinated brine
C. Hypochlorous acid
D. All of the above
Question 269
Silico-manganese steels (containing 0.7% Mn, 0.5% C and 2% Si)
A. Do not require heat treatment for any of its applications
B. Are used for leaf and coiled springs
C. Do not have good resilience properties
D. Is tempered at 850°C
Question 270
When the steel is subjected to normalising, its __________ decreases.
A. Yield point
B. Ductility
C. Ultimate tensile strength (UTS)
D. None of these
Question 271
Molybdenum steels containing 0.15 to 0.40% molybdenum
A. Are prone to temper brittleness
B. Are used for automobile parts like gears, axle, shaft, bearings etc
C. Have very poor fatigue resistance
D. Do not contain nickel or chromium or both
Question 272
Which one is remelted and poured into moulds to get cast iron?
A. Wrought iron
B. Pig iron
C. Low carbon steel
D. Mild steel
Question 273
Reactor used in the production of polyvinyl chloride (PVC) is made of
A. Nickel or glass lined steel
B. Aluminium
C. Tantalum
D. Lead
Question 274
Soap kettle used in the production of laundry soap is made of
A. Steel with top section nickel clad or stainless steel
B. Cast iron
C. Nickel
D. Concrete
Question 275
In the Kraft process of sulphate paper pulp manufacture, the black liquor and the white liquor storage tank is made of
A. Concrete
B. Wood
C. Steel
D. Porcelain
Question 276
Cast iron is a __________ material.
A. Brittle
B. Ductile
C. Tough
D. Malleable
Question 277
The specific gravity of coal depends mainly on its __________ content.
A. Carbon
B. Volatile matter
C. Ash
D. Moisture
Question 278
In a plate type heat exchanger, heat transfer plates are never made of
A. Stainless steel
B. Cast iron
C. Titanium
D. Hastealloy C
Question 279
Platinum and silver are corroded by
A. Caustic soda solution
B. Phosphoric acid
C. Sulphuric acid (10%)
D. None of these
Question 280
For storing water and acid free benzol, use a __________ vessel.
A. Steel
B. Karbate
C. Stainless steel
D. None of these
Question 281
A steel alloy containing 36% nickel is called __________ , which has a zero co- efficient of expansion.
A. Austenitic stainless steel
B. Heat resisting steel
C. Invar
D. High speed steel
Question 282
Hydrocyanic acid is not shipped in
A. Cast iron vessels
B. Steel cylinders
C. Aluminium containers
D. Monel drums
Question 283
The carbonating tower used in Solvay process of soda ash manufacture is made of
A. Cast iron
B. Stainless steel
C. Karbate
D. Lead lined steel
Question 284
The material of construction of bearings is
A. Cast iron
B. Babbit metal
C. Pig iron
D. Steel
Question 285
Metal at the top of the electromotive series is
A. Least active
B. Most stable
C. Most active
D. Most noble
Question 286
Which of the following would not be a suitable material of construction for handling aqueous hydrofluoric acid (HF) at 100°C ?
A. Monel
B. Stainless steel
C. Graphite
D. Kel-F and teflon
Question 287
Chromel (Nichrome) is an alloy of
A. Chromium and molybdenum
B. Nickel and chromium
C. Molybdenum and nickel
D. Chromium and aluminium
Question 288
The metals occuring at the lower most position in the electromotive series
A. Do not resist corrosion
B. Resist corrosion very strongly
C. Are very brittle
D. Are heat insulators
Question 289
Atmospheric corrosion of metals result from their
A. Slow oxidation
B. Fast oxidation
C. Fast hydration
D. Slow dehydration
Question 290
Condenser tubes are not made of
A. Cartridge brass
B. Muntz brass
C. Wood metal
D. Aluminium brass alloy
Question 291
Which of the following is the most prone to atmospheric corrosion?
A. Silver
B. Iron
C. Tin
D. Copper
Question 292
Bronze is an alloy of copper and
A. Lead
B. Tin
C. Nickel
D. Zinc
Question 293
Material of construction of pipe generally used for conveying water in India is
A. Stainless steel
B. Cast iron
C. Wrought iron
D. Lead lined steel
Question 294
Centrifugal pump made of pyrex or glass can't be used to pump
A. Milk and fruit juices
B. Alkaline solutions
C. Dilute H₂SO₄ at room temperature
D. Brine
Question 295
Babbit metal used for making bearings should have
A. High-co-efficient of friction between journal and bearing
B. Ability to retain lubricant on its surface
C. Low co-efficient of friction between journal and bearing
D. Both B & C
Question 296
Tank furnace used for melting of glass is made of
A. Mild steel
B. Cast iron
C. Refractory blocks
D. Stainless steel
Question 297
The hardest material just prior to diamond in Mhos scale is
A. Topax
B. Carborundum
C. Corrundum
D. Calcite
Question 298
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
A. Brass
B. Copper
C. High carbon steel
D. Aluminium
Question 299
The process of coating steel sheets by zinc to improve its corrosion resistance is called
A. Calorising
B. Galvanising
C. Zincification
D. Tempering
Question 300
The main constituent of carborundum is __________ carbide.
A. Calcium
B. Silicon
C. Boron
D. Aluminium
Question 301
Cast iron vessels are not suitable for the storage of
A. Freon
B. H₂SO₄ (95%) at room temperature
C. H₂SO₄ (fuming)
D. Wet SO₂
Question 302
Wrought iron is having very high
A. Hardness
B. Strength
C. Corrosion resistance
D. Susceptibility to changes in its properties by heat treatment
Question 303
Anodic material used for the cathodic protection of underground buried steel pipeline is
A. Nickel or copper
B. Zinc or magnesium
C. Bronze
D. Brass
Question 304
For platinum thermocouples, lead wires are made of
A. Copper & copper-nickel alloys
B. Copper & iron
C. Iron & nickel
D. Tin & nickel
Question 305
Presence of high phosphorous in cast iron increases its
A. Fluidity
B. Melting point
C. Shrinkage
D. Tensile strength
Question 306
Which of the following is not shipped in mild steel containers?
A. Acetone
B. Ammonia
C. Ethyl alcohol
D. Formic acid
Question 307
Ceramic recuperators are generally made of
A. Silicon carbide
B. Calcium carbide
C. Fireclay bricks
D. High alumina bricks
Question 308
Hypersil' is a __________ steel.
A. High speed
B. Silicon
C. Molybdenum
D. Tungsten
Question 309
Perspex is nothing but
A. Acrylic sheet
B. An elastomer
C. An alloy of lead and tin
D. Aluminium foil clad with bakelite
Question 310
Phenol is not shipped in
A. Nickel lined steel tank cars
B. Galvanised or tin lined drums
C. Boxed glass carboys
D. Cast iron containers
Question 311
Pick out the wrong statement.
A. Alloys are harder than their component elements
B. Presence of silicon in steel decreases its electrical resistance
C. Karbate is an acid resistant material of construction
D. Nichrome, a steel alloyed with 10% Ni and 20% Cr can be used upto a temperature of 1100°C
Question 312
Plastics are
A. Used in very high temperature applications
B. Non-biodegradable
C. Not suitable for drainage pipe manufacture
D. All of the above
Question 313
Which of the following is not a copper based alloy with nickel?
A. German silver
B. Monel metal
C. Inconel
D. Constantan
Question 314
The presence of impurities in iron
A. Increases its melting point
B. Does not affect its melting point
C. Decreases its melting point
D. Makes it malleable
Question 315
Presence of nitrogen in steel
A. Makes it brittle
B. Increases its strength
C. Increases its hardness
D. Is desirable
Question 316
Presence of silicon in steel
A. Is in the form of free Si
B. Indicates that steel is not deoxidised properly
C. Decreases the blow holes formation tendency in castings
D. None of these
Question 317
Carbon is present in steel wholly in the
A. Combined form
B. Free state as graphite
C. Both A & B
D. Neither A nor B
Question 318
Hastelloy C is a good material of construction in chemical process industry, since it is
A. Highly corrosion resistant and is readily fabricated
B. Relatively inexpensive although it can be fabricated with some difficulty
C. Corrosion resistant to most alkalis, particularly because of its coper content
D. Light and resists attack by acids
Question 319
Spray dryer for evaporating milk to produce milk powder is made of
A. Lead lined steel
B. Stainless steel
C. Aluminium
D. Cast iron
Question 320
Pure nickel is
A. Ferromagnetic above its curie point (i.e., 415°C)
B. Having h.c.p. crystal lattice
C. Ferromagnetic at room temperature
D. Not resistant to oxidation at high temperature
Question 321
Aluminium alloy is one of the most suitable materials of construction for aircrafts mainly due to its
A. High strength to weight ratio
B. Low temperature strength properties
C. Its ability to be cast, rolled, forged & stamped
D. High strength and corrosion & oxidation-resistance at elevated temperature
Question 322
The most commonly used resin for making reinforced plastic is
A. Unsaturated polyester
B. Polypropylene
C. Polyurathane
D. Nylon-6
Question 323
Ability of a material to absorb energy in deformation in the plastic range is characterised as its
A. Ductility
B. Toughness
C. Creep
D. Resilience
Question 324
Evaporator used for concentrating tomato juice is made of
A. Nickel
B. Brass
C. Stainless steel-glass lined
D. Cast iron-rubber lined
Question 325
Which of the following alloying elements is present in maximum percentage in high speed steel.
A. Molybdenum
B. Chromium
C. Tungsten
D. Vanadium
Question 326
Hardest material so far found is
A. Diamond
B. Graphite
C. Carborundum
D. Pumice stone
Question 327
A hardness depth of about 3 mm can be achieved by induction hardness in __________ seconds.
A. 5
B. 100
C. 250
D. 500
Question 328
Mild steel storage vessels are suitable for the storage of
A. Anhydrous ammonia
B. Fatty acids
C. Hydrochloric acid (95%)
D. Sulphuric acid (25%)
Question 329
In the Contact process of sulphuric acid manufacture, 98% acid cooler is made of
A. Stainless steel
B. Cast iron
C. Lead lined steel
D. Rubber lined steel
Question 330
Steel rods are used in reinforced concrete to increase its __________ strength.
A. Shear
B. Tensile
C. Compressive
D. None of these
Question 331
Molten phthalic anhydride is stored in a/an __________ vessel.
A. Aluminium
B. Nickel clad steel
C. Lead lined steel
D. Glass lined steel
Question 332
Compressive strength of wood is usually more along the grains. The tenile strength of wood as compared to that of steel is about
A. Half
B. One third
C. One fifth
D. One twelfth
Question 333
High degree of toughness is a must for
A. High speed steel
B. Shock resisting steel
C. Cold work tool steel
D. None of these
Question 334
Concrete tank can be used to store
A. Alum
B. Ferrous sulphate
C. Sulphuric acid
D. Saturated brine
Question 335
An elastic behaviour of materials is expressed in terms of
A. Hysterisis loop area
B. Stress-strain curve
C. Relaxation time
D. None of these
Question 336
Nitriding of steel is done (in electric furnace) at __________ °C.
A. 510
B. 1720
C. 2210
D. 910
Question 337
Cast iron and steel pipes are produced by __________ casting.
A. Die
B. Investment
C. Slush
D. True centrifugal
Question 338
Super conductors are those substances, which
A. Offer no resistance to current flow
B. Conduct electricity at low temperature
C. Offer high resistance to current flow
D. Conduct electricity at high temperature
Question 339
Presence of 0.3 to 0.5% arsenic in copper increases its
A. Ductility
B. Malleability
C. Tenacity & hardness
D. Electrical conductivity
Question 340
Amount of energy that a material can absorb before its fracture is a measure of its
A. Toughness
B. Resilience
C. Malleability
D. Ductility
Question 341
Iron rust is
A. Ferrous oxide
B. Hydrated ferric oxide
C. Powdered iron
D. Ferric sulphide
Question 342
Which of the following is a low melting point metal?
A. Stainless steel
B. Wrought iron
C. Tin
D. Copper
Question 343
Which of the following is the most elastic material?
A. Plastic
B. Glass
C. Steel
D. Rubber
Question 344
Visco-elastic behaviour of materials which is time dependent is common in
A. Plastics
B. Crystalline solid
C. Non-crystalline solids
D. Non-crystalline organic polymer
Question 345
Nickel (76%) and chromium (15%) alloys are termed as
A. Inconel
B. Monel
C. Aluminium bronzes
D. Brass
Question 346
Karbate is
A. A mixture of iron dust and saw dust
B. Carbon impregnated with resin (usually bakelite)
C. An acid resistant material
D. Both B and C
Question 347
Kel-F is a material, which is
A. Chemically known as polychlorotrifluor-oethylene (PTFE)
B. Having excellent chemical & high temperature resistance (upto 200°C)
C. Having elastomeric properties
D. All of the above
Question 348
Hot working of lead is carried out at
A. 75° C
B. 373° K
C. 150° C
D. Room temperature
Question 349
A chemical change takes place when iron
A. Rusts
B. Melts
C. Is heated
D. None of these
Question 350
Addition of 2% nickel in steel makes it suitable for making
A. Electronic valves
B. Boiler plates, rivets etc
C. Turbine blades
D. Connecting rod
Question 351
Which of the following materials may prove unsuitable for handling acetic acid (glacial & anhydrous) at 40°C?
A. Silicone rubber, teflon, procelain and wood
B. Nickel, monel, stainless steel and graphite
C. Aluminium, copper, high silicon iron
D. Brass, cast iron, mild steel and tin
Question 352
Cold work tool steel should have
A. High toughness
B. Poor hardenability
C. High wear resistance
D. All of the above
Question 353
Pick out the wrong statement.
A. Etal/alloys having hexagonal crystal lattice structure are less malleable than those having cubic crystal lattice structure
B. Etal/alloys having body centred cubic (bcc) crystal lattice structure is stronger & less ductile than those having face centred cubic (fcc) crystal lattice structure
C. Ungsten has a body centred cubic (bcc) crystal lattice structure
D. Oth ferritic & austenitic stainless steel has a face centred cubic (fcc) crystal structure
Question 354
The softest material in Mho's scale (for measuring hardness) is
A. Talc
B. Gypsum
C. Rubber
D. None of these
Question 355
Lead
A. Is the hardest metal in common use
B. Is the lightest metal in common use
C. Can not be scratched by finger nails
D. Can not be work hardened
Question 356
Lead is
A. Not resistant to corrosion
B. Used as a cathodic material
C. Not used as pigment (in its compound forms) for paints
D. Used as a shock absorber (in mattress form) between the foundation an steel framework of skyscrapper buildings
Question 357
Lead pipe is
A. Especially resistant to solutions containing H₂SO₄
B. Usually joined by burning (e.g. by melting to adjacent pieces with a torch)
C. Having very low elastic limit resulting in permanent deformation from either mechanical or thermal strain
D. All of the above
Question 358
Hydrochloric acid absorber in made of
A. Cast iron
B. Mild steel
C. Karbate
D. Stainless steel
Question 359
Which of the following is not an alloy of tin?
A. White-bearing metal
B. Pewter type metal
C. Soft solder
D. German silver
Question 360
Which of the following is the easiest to bend?
A. Steel
B. Stainless steel
C. Cast iron
D. Wrought iron
Question 361
Which of the following alloys does not contain nickel?
A. Chlorinet - 2 alloy
B. Monel
C. Inconel
D. Babbit metal
Question 362
Galvanising is generally done on
A. Non-ferrous metals
B. Low carbon steel
C. Stainless steel
D. Cast iron
Question 363
Polymorphism is not exhibited by
A. Carbon
B. Iron
C. Phosphorous
D. None of these
Question 364
Thermal shield used in high powered nuclear reactor to protect the walls of the reactor from radiation damage is made of
A. Concrete
B. Steel
C. Zircalloy
D. Graphite
Question 365
__________ is used for examining the macro-structure of a material.
A. Metallurgical microscope
B. Optical microscope
C. X-rays
D. Visual inspection by naked eye
Question 366
Zircalloy used as a fuel cladding material in a nuclear reactor (thermal) is an alloy of zirconium
A. Tin, nickel, iron and chromium
B. And graphite
C. And copper
D. None of these
Question 367
Manganese in steel affects its
A. Ductility
B. Tensile strength
C. Hardness
D. None of these
Question 368
Which of the following contains maximum percentage of carbon?
A. Boiler plate steel
B. Rail steel
C. Saws for cutting steel
D. Railway spring steel
Question 369
The phenomenon in which slow extension of material takes place with the time at constant load is called
A. Plasticity
B. Creep
C. Elasticity
D. Ductility
Question 370
The fermentor used in the production of pencillin (by deep fermentation process) is made of
A. Glass
B. Glass lined steel
C. High silicon cast iron
D. Procelain
Question 371
Among the tin containing alloys, __________ consumes the maximum amount of tin.
A. Solder
B. White metal
C. Pewter matal
D. Bronzes
Question 372
Metalloid is
A. Highly electronegative in nature
B. An element which exhibits the properties of both metal & non-metal
C. An alloy
D. All of the above
Question 373
Combination of metals and ceramics are called
A. Metalloy
B. Cermets
C. Pellets
D. Non-crystalline ceramics
Question 374
Mild steel is
A. A low carbon steel (0.05 to 0.3% carbon)
B. Highly resistant to corrosion (as much as stainless steel)
C. A high carbon steel (0.5 to 1.5% carbon)
D. Very poor in strength & ductility
Question 375
Pick out the wrong statement.
A. The toughness of a material decreases, when it is heated
B. Crane hooks are normally made of wrought iron
C. Cold working of a metal decreases its fatigue strength
D. The temperature at which new grains are formed in a metal is known as the recrystallisation temperature
Question 376
Mild steel is used for making
A. Fish plates
B. Die block
C. Channels
D. Drop forging
Question 377
Monel alloy is
A. The costliest of all the alloys of nickel
B. Not suitable for making kitchen utensils
C. Used for making steam valves and turbine blades as it resists steam attack at high temperature
D. Not used in cast and wrought forms
Question 378
Monel metal is an alloy of
A. Molybdenum and nickel
B. Nickel and copper
C. Molybdenum and aluminium
D. Molybdenum and zinc
Question 379
The formation of oxide film on a metal due to atmospheric exposure reduces its
A. Toughness
B. Stiffness
C. Creep limit
D. All of the above
Question 380
Which of the following mechanical properties of a material is most structure insensitive?
A. Modulus of elasticity (young
B. Toughness
C. Percentage reduction of area
D. Tensile strength
Question 381
__________ of a material results, when its strength is increased & ductility is decreased by heating at a relatively lower temperature after cold working.
A. Solid solution hardening
B. Screw dislocation
C. Strain ageing
D. Twinning
Question 382
Muntz metal is a/an alloys of
A. Magnesium & tin
B. Ferrous material
C. Lead & tin
D. Copper & zinc
Question 383
Caustic soda is transported in __________ lined containers.
A. Glass
B. Nickel
C. Neoprene
D. Either B or C
Question 384
Sulphuric acid is mixed with ground phosphate rock (to produce phosphoric acid) in a steel digestor lined with
A. Acidic refractory
B. Rubber
C. Karbate
D. Lead or acid-proof bricks
Question 385
Which of the following is an alloy of nickel and copper?
A. Hastelloy
B. Duriron
C. Monel
D. Inconel
Question 386
Bog iron used for the adsorption of H?S from coke oven gas is
A. An intimate mixture of saw dust and iron dust (i.e. moist ferric hydroxide)
B. Iron impregnated with resin (usually bakelite)
C. Carbon free iron
D. None of these
Question 387
Addition of tungsten to steel imparts
A. Magnetic properties
B. Cutting hardness
C. Corrosion resistance
D. Ductility
Question 388
With increase in the carbon percentage in the steel, its
A. Hardness increases
B. Ductility reduces
C. Tensile strength increases
D. All of the above
Question 389
A material is able to retain the deformation permanently by virtue of its
A. Elasticity
B. Plasticity
C. Ductility
D. Malleability
Question 390
Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
A. Corrosion resistance
B. Tensile strength
C. Machinability
D. Compressive strength
Question 391
Maximum permissible sulphur content in steel is __________ percent.
A. 0.015
B. 0.055
C. 0.505
D. 0.805
Question 392
Carbon content in steel is __________ percent.
A. 0.1-2
B. 4-6
C. 2-4
D. 0.001-0.01
Question 393
Carbon content in plain carbon steel is __________ percent.
A. 0.1 to 0.15
B. 0.35 to 0.45
C. 0.65 to 0.80
D. 0.85 to 1.2
Question 394
Constantan used in thermocouples is an alloy of
A. Iron & copper
B. Copper & aluminium
C. Lead & tin
D. None of these
Question 395
__________ does not contain tin as an alloying material.
A. Brass
B. Pewter
C. Solder
D. Babbit metal
Question 396
Which of the following finds the least commercial use?
A. Pure iron
B. High silicon iron
C. Low carbon steel
D. High carbon steel
Question 397
Pick out the wrong statement.
A. Tin can be readily and very easily drawn into very fine wire
B. Tin can be severely cold worked without the necessity of annealing due to its low recrystallisation temperature
C. Tin exists in two allotropic forms
D. The predominant use of tin is in the form of coating for steel & copper alloys
Question 398
A hardened steel essentially contains
A. Sorbite
B. Troostite
C. Martensite
D. None of these
Question 399
Diamagnetic materials are magnetised
A. Strongly
B. Only slightly
C. With eddy currents only
D. In a direction opposite to that of the applied field
Question 400
Which of the following comprises of hydrocarbons?
A. Mica flakes
B. Glass
C. Rubber
D. None of these
Question 401
Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.
A. High silicon iron, Kel-F and teflon
B. Tin and wood
C. Silicone rubber
D. Stainless steel
Question 402
Which of the following is not an alloy of copper?
A. Muntz metal
B. Admirability gun metal
C. German silver
D. Pewter metal
Question 403
Tempering of steel is done to make it
A. Brittle
B. Hard
C. Rollable
D. Soft
Question 404
Galvanising (i.e., zinc coating) of steel sheets is done to
A. Prevent its rusting by contact with corrosive atmosphere
B. Protect the base metal by cathodic protection
C. Both A & B
D. Neither A nor B
Question 405
Nickel is a constituent of
A. Bronze
B. Solder
C. Duralumin
D. Monel metal
Question 406
Which of the following heat treatment processes is used for softening the hardened material?
A. Normalising
B. Tempering
C. Annealing
D. None of these
Question 407
Stainless steel is not corroded by
A. Hydrochloric acid (10%)
B. Nitric acid (10%)
C. Sulphuric acid (10%)
D. Saturated brine
Question 408
Which of the following stainless steels is non-magnetic?
A. Ferritic
B. Martensitic
C. Austenitic
D. None of these
Question 409
Corrosion resistance of steel is increased by the addition of
A. Phosphorous and tungsten
B. Nickel and chromium
C. Lead and vanadium
D. Molybdenum and tungsten
Question 410
Tin in its pure form is used for making
A. Cans for food packing
B. Collapsible tubes for toilet preparations
C. Foil for wrapping cheese
D. All of the above
Question 411
All materials obey Hooke's law within elastic limit. When elastic limit is reached, the tensile strain
A. Increases very quickly
B. Decreases very quickly
C. Increases in proportion to stress
D. Decreases in proportion to stress
Question 412
Acetaldehyde is shipped in __________ drums.
A. Cast iron
B. Steel
C. Aluminium
D. Either B & C
Question 413
Aqueous nitric acid is stored in __________ vessel.
A. Plain carbon steel
B. Stainless steel
C. Cast iron
D. Thermosetting plastic material
Question 414
Babbit metals used for making bearings are
A. Tin or lead based alloys
B. Short of antifrictional properties
C. Having homogenous microstructure
D. Yellow metals
Question 415
Presence of manganese in alloy steel improves its
A. Corrosion resistance
B. Cutting ability
C. Abrasion resistance & toughness
D. Elasticity & creep resistance
Question 416
Glass lined vessels are not used for handling
A. Dilute HNO₃
B. Dilute HNO₃
C. Dilute HCI
D. Hydroflouric acid
Question 417
Thermosetting resins are those polymers, which
A. Do not increase in plasticity with rise in temperature
B. Allow slip to occur between molecules
C. Do not take on a permanent set
D. None of these
Question 418
Lead lined equipments & vessels are suitable for handling
A. Hydrochloric acid (10%)
B. Nitric acid
C. Sulphuric acid upto 60°C
D. All of the above
Question 419
Semi steel' is
A. Produced by adding 10-20% steel to the cupola charge
B. Stronger than cast iron
C. Both A & B
D. Neither A nor B
Question 420
Carbon supply in pack carburising process is in the form of
A. Charcoal
B. Calcium carbide
C. Hydrocarbon oil
D. Graphite
Question 421
Thermoplastic resins are those polymers, which
A. Has decreased plasticity at increasing temperature
B. Can not be moulded
C. Easily deform under pressure at high temperature
D. None of these
Question 422
Most common stainless steel type 316, which is highly resistant to corrosion contains
A. 16-13% Cr 10-14% Ni and 2-3% Mo
B. 20-22% Cr, and 8-10% Ni
C. 2-4% Cr, 22% NI and 2-4% Mo
D. None of these
Question 423
Spark plugs are made of
A. High alumina ceramic
B. Metallic carbides
C. Corundum
D. Carborundum
Question 424
Which of the following commercial metals is most abundantly found in India?
A. Copper
B. Aluminium
C. Nickel
D. Zinc
Question 425
Maximum carbon content in cast iron is __________ percent.
A. 3.8
B. 5.2
C. 4.8
D. 4.3
Question 426
Out of the following, copper vessels are the most suitable for the storage of
A. Bromine
B. Dry chlorine & dry fluorine
C. Nitric acid (95% and fuming)
D. Phosphoric acid (95%) & sulphuric acid (95% and fuming)
Question 427
Stainless steel contains
A. Chromium and nickel
B. Copper
C. Aluminium
D. Vanadium
Question 428
The digester of a Gobar gas plant is a
A. Mild steel drum
B. Stainless steel vessel
C. Masonry well
D. Cast iron vessel
Question 429
The ability of a material to absorb energy in the elastic range is a measure of its
A. Toughness
B. Resilience
C. Malleability
D. Brittleness
Question 430
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?
A. High silicon iron, silicon rubber, Kel-F and teflon
B. Mild steel and stainless steel
C. Cast iron, tin and aluminium
D. Copper, nickel and monel
Question 431
Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its
A. High co-efficient of thermal expansion
B. Low thermal conductivity
C. High corrosion resistance
D. All of the above
Question 432
Rotary kilns in cement industry are lined with____bricks.
A. Fireclay
B. Silica
C. Lead
D. High alumina & high magnesia
Question 433
Which of the following is not an alloy of copper and tin?
A. Bell metal
B. Gun metal
C. Admiralty gun metal
D. Monel metal
Question 434
Cast iron detachable joint is used in __________ pipes.
A. Steel
B. Cast iron
C. Asbestos cement
D. Reinforced cement concrete
Question 435
Containers made of high silicon cast iron (14% Si) are not suitable for the storage of
A. Acetic acid
B. Benzoic & boric acids
C. Phosphoric acid (95%) & sulphuric acid (95%)
D. Hydrochloric acid (concentrated)
Question 436
The softest material just next to talc in the Mhos scale is
A. Quartz
B. Gypsum
C. Feldspar
D. Fluorite
Question 437
Brass container is suitable for storing
A. Aqueous ammonia
B. Beer
C. H₂SO₄(95%)
D. Phosphoric acid (95%)
Question 438
Hardening of steel is not possible unless it is heated __________ critical point.
A. Above the highest
B. Above the lowest
C. Between the first & second
D. Between the second & third
Question 439
Mild steel is a/an __________ steel.
A. Low carbon
B. Medium carbon
C. High carbon
D. High alloy
Question 440
__________ is added in low carbon steel to raise its yield point.
A. Sulphur
B. Phosphorous
C. Silicon
D. Manganese
Question 441
Telfon (PTFE) is corroded by
A. Hydrochloric acid (10%)
B. Hydrochloric acid (95%)
C. Sulphuric acid
D. None of these
Question 442
Vycor, a widely used material for making 'thermal wells' in temperature measurement, is a
A. Cermet
B. Glass
C. Thermosetting plastic
D. Metallic alloy
Question 443
Electronic structure of a material is generally studied by
A. Metallurgical microscope
B. Electron diffraction
C. Spectroscopic techniques
D. X-ray
Question 444
__________ alloys have the highest specific strength of all the structural materials out of the following.
A. Magnetic steel
B. Titanium
C. Chromium
D. Magnesium
Question 445
Slow plastic deformation of metals under a constant stress is termed as __________ failure.
A. Fatigue
B. Endurance
C. Creep
D. None of these
Question 446
Which of the following is the hardest?
A. Cementite
B. Pearlite
C. Austenite
D. Ferrite
Question 447
A metallic alloy in general as compared to their pure metal components is
A. More corrosion resistant
B. Having higher melting point
C. Having lower hardness, reactivity and fusibility
D. Having lower electrical conductivity
Question 448
Thermosetting polymers are
A. Injection moulded
B. Cast molded
C. Extruded
D. None of these
Question 449
Tin coating is not done by
A. Vaporising
B. Hot dipping
C. Electro deposition
D. Spraying
Question 450
Tin vessels are corroded by
A. Anhydrous ammonia
B. Aromatic solvents
C. Synthetic detergent solution
D. None of these
Question 451
Most suitable material for high pressure vessel operating at 500 atm. and 500° C is
A. Molybdenum stainless steel
B. 18/8 stainless steel
C. Mild steel
D. High silicon iron (14% Si)
Question 452
Titanium metal
A. Exists in three allotropic forms
B. Can not be welded
C. Is used in oceanographic and space exploration applications
D. None of these
Question 453
Ferric stainless steels compared to austenitic stainless steels
A. Have lower corrosion resistance
B. Are harder to fabricate
C. Are less ductile and hence less suitable for cold pressing
D. All of the above
Question 454
A measure of toughness of a material is its
A. Percentage elongation
B. Yield strength
C. Ultimate strength
D. Area under stress-strain diagram
Question 455
Which of the following is the most suitable material of construction for evaporator & its tubes for concentrating NaOH solution to 70%?
A. Cast iron
B. Steel
C. Nickel
D. Karbate
Question 456
Which one has the maximum tensile strength out of the following?
A. Nodular cast iron
B. Pig iron
C. White cast iron
D. Grey cast iron
Question 457
Dielectric strength of a material is
A. Its energy stroage capacity
B. A magnetic property
C. Its capacity to resist the flow of current
D. Its capacity to withstand high voltage
Question 458
Corrosion involves exchange of electrons in __________ corrosion.
A. Chemical
B. Electrochemical
C. Both A & B
D. Neither A nor B
Question 459
Materials having __________ lattice structure are usually most ductile.
A. F.c.c.
B. B.c.c.
C. H.c.p.
D. Cubic
Question 460
__________ steel is widely used for the manufacture of motor car crankshafts.
A. Silicon
B. Nickel
C. Chrome
D. High speed
Question 461
Fatigue failure of a material may occur, when it is subjected to __________ stress.
A. Fluctuating
B. Tensile
C. Compressive
D. Torsion
Question 462
Aqueous nitric acid is stored in
A. Steel drum
B. Stainless steel vessel
C. Cast iron vessel lined with acid-proof masonry brick
D. Cast iron vessel
Question 463
Sulphur melting pit in the sulphuric acid plant is made of
A. Lead lined stainless steel
B. Cast iron
C. Steel or cement-brick lined
D. Hard wood
Question 464
Maximum consumption of copper is in
A. Utensil manufacture
B. Electrical industry
C. Industrial equipment manufacture
D. Small scale industries
Question 465
Urea autoclave is made of
A. Cast iron
B. Refractory blocks
C. Stainless steel
D. Lead lined steel
Question 466
For spinning viscose rayon, the extrusion spinnerettes are made of
A. Platinum or gold alloys
B. High carbon steel
C. Aluminium
D. Nickel
Question 467
Generally __________ are subjected to galvanising (i.e., zinc coating).
A. Non-ferrous metals
B. Non-metals
C. Low carbon steels
D. Stainless steel
Question 468
Which of the following will have the highest melting point?
A. Pig iron
B. Mild steel
C. Wrought iron
D. High carbon steel
Question 469
Water gas generator is made of
A. Carbon steel-brick lined
B. Stainless steel-lead lined
C. Cast iron
D. High carbon steel-procelain lined
Question 470
Post weld heat treatment is done by
A. Normalising
B. Stress relieving
C. Tempering
D. Solution annealing
Question 471
When iron is rusted, it is
A. Converted to a fine powder
B. Reduced
C. Oxidised
D. None of these
Question 472
White metal is an alloy of
A. Lead, tin and cadmium
B. Copper, tin and zinc
C. Copper and lead
D. None of these
Question 473
Which of the following is the hardest material?
A. Topaz
B. Quartz
C. Corrundum
D. Flourite
Question 474
Which of the following is the softest material?
A. Quartz
B. Calcite
C. Corrundum
D. Flourite
Question 475
Wood is corroded by
A. Hydrochloric acid
B. SO₂ (dry or wet)
C. Chlorine (dry or wet)
D. All of the above
Question 476
Work hardening of a material
A. Decreases its tensile strength
B. Decreases its ductility
C. Increases its ductility
D. Does not affect its ductility
Question 477
Wrought iron is
A. High carbon iron
B. Highly resistance to acid corrosion
C. Malleable & ductile; and hence is used for chain links, hooks & couplings
D. An alloy of iron, chromium & carbon
Question 478
Creep is not exhibited at low temperature by
A. Rubber
B. Acrylics
C. Lead
D. Plastics
Question 479
Silicon percentage in iron castings to have maximum hardness should be about
A. 0.3
B. 0.5
C. 0.8
D. 2.5
Question 480
Rotary driers are generally made of
A. Cast iron
B. Mild steel
C. High silicon iron (14% Si)
D. Tin lined with refractory bricks
Question 481
Corrosion resisting properties of cast iron are significantly improved by the addition of 12 - 15% of
A. Tungsten
B. Vanadium
C. Silicon
D. All of the above
Question 482
Which metal is protected by the layer of its own oxide?
A. Iron
B. Silver
C. Calcium
D. Aluminium
Question 483
Light weight metallic alloy used in aircraft industry is
A. Aluminium
B. High silicon (14%) iron
C. Duralumin
D. Phosphor bronze
Question 484
Which of the following is not a non-ferrous alloy?
A. Meehanite
B. Magnalium
C. Gun metal
D. Muntz metal
Question 485
Which has the maximum melting point out of the following?
A. Steel
B. Cast iron
C. Stainless steel
D. Wrought iron
Question 486
Age hardening is concerned with
A. Copper
B. Brass
C. Duralumin
D. Silver
Question 487
Aluminium storage vessel can be used to store
A. Aqua regia
B. Ferrous sulphate
C. Hydrochloric acid (10%)
D. None of these
Question 488
A material no longer behaves elastically beyond
A. Plastic limit
B. Limiting load
C. Elastic limit
D. Breaking load
Question 489
German silver in an alloy of
A. Copper, nickel and zinc
B. Copper, aluminium and silver
C. Silver, zinc and aluminium
D. Silver, nickel and zinc
Question 490
Which of the following is the lightest of engineering metals?
A. Magnesium
B. Aluminium
C. Titanium
D. Tin
Question 491
Glass is corroded by
A. Fluorine (dry or wet)
B. Sulphuric acid
C. Phosphoric acid
D. None of these
Question 492
Photographic plates are coated with
A. Silver nitrate
B. Silver halide
C. Calcium silicate
D. Metallic silver
Question 493
Graphite is a good
A. Thermal & electrical insulator
B. Conductor of heat
C. Conductor of electricity
D. Both B & C
Question 494
Graphite is corroded by
A. Sulphuric acid (10%)
B. Sea water
C. Hydrochloric acid
D. None of these
Question 495
Fatigue strength of a material increases by
A. Having notches in the specimen
B. Rise in temperature
C. Under stressing the specimen
D. Having scratches on the surface
Question 496
Which of the following alloy steels is the most suitable for making gun barrels and projectiles?
A. Tungsten steel
B. Molybdenum steel
C. Nickel-chrome steel
D. Cobalt steel
Question 497
Gun metal is an alloy of
A. Nickel, tin and copper
B. Copper, tin and zinc
C. Copper, phosphorus and nickel
D. Manganese, phosphorus and nickel
Question 498
Which is the purest form of iron?
A. Wrought iron
B. Pig iron
C. Bessemer iron
D. Grey iron
Question 499
High speed steel should have high
A. Toughness
B. Wear resistance
C. Hardenability
D. Both B & C
Question 500
High carbon steel contains more than __________ percent carbon.
A. 0.5
B. 2.2
C. 2.5
D. 2.8
Question 501
Which of the following exercises most powerful influence on the mechanical properties of steel?
A. Manganese
B. Carbon
C. Phosphorous
D. Silicon
Question 502
Hardened steel is softened by
A. Normalising
B. Tempering
C. Annealing
D. Carburising
Question 503
Which of the following has the poorest wel-dability?
A. Low carbon steel
B. Mild steel
C. Wrought iron
D. High-carbon steel
Question 504
Hastelloy comprises of
A. Copper and tin
B. Copper and nickel
C. Molybdenum and nickel
D. Lead and tin
Question 505
Reduction in the grain size reduces the __________ of the material.
A. Fatigue resistance
B. Tensile strength
C. Creep resistance
D. All of the above
Question 506
The 'bomb' in the bomb calorimeter is made of
A. Molybdenum stainless steel
B. Mild steel
C. High silicon iron (14% Si)
D. Copper
Question 507
Which of the following crystal structures characterises the ferritic stainless steel?
A. Face centred cubic
B. Body centred cubic
C. Simple hexagonal
D. None of these
Question 508
__________ is used for determining the tensile strength of steels.
A. Hydraulic press
B. Universal testing machine
C. Mechanical press
D. None of these
Question 509
Sheardising process is used for
A. Surface coating
B. Heat treatment of high speed steel
C. Cold working on metals
D. None of these
Question 510
Very high sulphur in pig iron makes
A. Its casting unsound
B. Its hard and machinable
C. Its brittle and malleable
D. All of the above
Question 511
Which of the following has the highest compressive strength?
A. Wrought iron
B. Cast iron
C. Mild steel
D. High carbon steel
Question 512
The range of Mho's scale of hardness is from
A. 1 to 15
B. 1 to 8
C. 1 to 10
D. 0 to 10
Question 513
Purity of electrical grade aluminium should be ≥ __________ percent.
A. 95
B. 99.5
C. 85
D. 90
Question 514
Which is an amorphous material?
A. Glass
B. Mica
C. Brass
D. Cast iron
Question 515
Pick out the correct statement.
A. Stainless steel is nothing but chromium coated steel
B. Hardening of a soft metal can be done by alloying it with another metal or non-metal
C. Plastic deformation of a material is its temporary distortion under the action of applied stress
D. Rusting of iron is not electrochemical in nature
Question 516
Plate and frame filter press is usually made of
A. Mild steel
B. Cast iron
C. Stainless steel
D. Galvanised iron
Question 517
Which of the following has the least value of ultimate tensile strength (UTS)?
A. Medium carbon steel
B. High carbon steel
C. Cast iron
D. Wrought iron
Question 518
Maximum consumption of zinc is in
A. Alloying
B. Galvanising
C. Utensil manufacture
D. Electrical industry
Question 519
Tin base and lead base alloys are used for bearing materials. Tin compared to lead has lower
A. Price
B. Corrosion resistance
C. Thermal conductivity
D. Abundant availability
Question 520
Inconel is an alloy of
A. Tin, zinc and nickel
B. Iron, nickel and chromium
C. Copper and nickel
D. Copper and tin
Question 521
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.
A. Ultimate
B. Yield point
C. Proof
D. None of these