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Q.1
Silicone rubber is not resistant to the corrosive action of
Sulphuric acid (10%)
Sulphuric acid (95%)
Ether
Both B and C
Q.2
With increase in carbide/graphite ratio in cast iron, its
Hardness & brittleness increases
Ductility decreases
Both A & B
Neither A nor B
Q.3
A material is called 'ductile', if it can be
Drawn into wires
Hammered to a thin sheet
Fractured without deformation
Made lustrous by heating it
Q.4
The maximum percentage of chromium that can be added to steel is about
12
18
24
30
Q.5
Maximum carbon content in any variety of steel can be upto 1.3%. Steel containing 0.4% Carbon is not used for making
Nuts
Bolts
Chiesels
Studs
Q.6
Which of the following has the least carbon percentage?
Low carbon steel
Mild steel
Wrought iron
White cast iron
Q.7
Ceramic materials
Are exemplified by clay and mica
Are poor electrical conductors due to lack of free electrons
Never exhibit polymorphism
All of the above
Q.8
Ball bearings are generally made of
Plain carbon steel
Chrome carbon steel
Stainless steel
Malleable cast iron
Q.9
Bell metal is an alloy of
Copper & zinc
Copper & tin
Copper & nickel
Zinc & tin
Q.10
Brass is an alloy of
Nickel and tin
Copper and zinc
Tin and lead
Copper, nickel and zinc
Q.11
Ability of a material to __________ is indicated by its damping capacity.
Withstand compression
Absorb vibration
Absorb shock
None of these
Q.12
Locomotive boiler tubes are made of __________ alloys.
Arsenic copper
Magnesium
Aluminium
Nickel
Q.13
Coke oven regenerators are made of __________ bricks.
Fire clay
Silica
Low thermal conductivity
High electrical conductivity
Q.14
Tin coating on metals is not done by
Spraying
Powder metallurgy
Hot dipping
Electro-deposition
Q.15
An ideal material of construction for the storage of 50% caustic soda solution would be
Karbate
High silicon cast iron
Monel
None of these
Q.16
Beehive coke ovens are made of __________ bricks.
Silica
Fireclay
Silicon carbide
Corundum
Q.17
Cold worked steel parts are normally subjected to
Normalising
Hardening
Annealing
Shot peening
Q.18
In cold working of metal as compared to its hot working
Cracks and blow holes are eliminated
Ductility and impact strength improves
Appreciable strain hardening is produced
Yield stress, hardness and fatigue strength is not at all affected
Q.19
German silver is an alloy of copper, nickel and
Zinc
Silver
Tin
Lead
Q.20
Which of the following has the highest density and the lowest melting point?
Stainless steel
Titanium
Lead
Aluminium
Q.21
Ball bearings are normally made of __________ steel.
High speed
High carbon
Chrome
Silicon
Q.22
Steel balls for ball bearings are generally made of __________ steel.
Cast
Stainless
Free carbon
Carbon chrome
Q.23
Babbit metal is not a
Tin base alloy
White metal
Lead base alloy
Pure metal
Q.24
Nickel (56%) and molybdenum (17%) alloys are called
Monel
Hastealloy C
Inconel
Bronzes
Q.25
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
Q.26
The electrical conductivity of a __________ decreases with rise in temperature.
Metal/alloy
Semi-conductor
Dielectric
None of these
Q.27
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
Q.28
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
Q.29
Acid proof stoneware
Has very low strength
Cannot be heated
Is broken by small temperature changes
All of the above
Q.30
Steel pipes are normally manufactured by __________ process.
Extrusion
Cold working
Forging
Electroforming
Q.31
Valves in pipe size of 2" and under are normally made of
Wrought iron
Brass
Bronze
Monel
Q.32
Wrought iron is a suitable material of construction for handling __________ solutions.
Dilute acidic
Concentrated acidic
Alkalis & alkaline
None of these
Q.33
Clock pendulums are usually made of __________ steel.
High speed
Stainless
Heat resisting
None of these
Q.34
Presence of high amount of silicon in cast iron
Suppresses the decomposition of Fe₃ C
Increases the formation of graphite
Increases the contraction of the metal
Reduces its fluidity
Q.35
18/8 steel is a/an __________ stainless steel.
Austenitic
Ferritic
Martensitic
None of these
Q.36
Zinc is highly __________ at room temperature.
Ductile
Resistant to atmospheric corrosion
Malleable
Brittle
Q.37
Brine solution is stored/treated in __________ lined vessels/pipes.
Rubber
Lead
Glass
Nickel
Q.38
Dry chlorine can be handled in a vessel made of
Iron or steel
PVC
Ickel
Brass
Q.39
How many molecules per unit cell are there in a face centred cubic lettice?
2
4
6
8
Q.40
Percentage elongation of a material is a measure of its
Ductility
Brittleness
Toughness
Malleability
Q.41
Invar contains the highest percentage of
Vanadium
Iron
Tungsten
Cobalt
Q.42
The most distinguished property of malleable cast iron is its high
Ductility
Hardness
Malleability
None of these
Q.43
The preferred material of construction for storage tanks for 98% sulphuric acid is
Aluminium
Lead
Stainless steel 316
Mild steel
Q.44
High speed cutting tool steels contain about __________ percent of tungsten.
6-8
18-20
30-35
50-55
Q.45
Fermenter used in the production of pen-cillin by deep fermentation proces is a __________ lined steel vessel
Rubber
Monel
Glass
Nickel
Q.46
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
Q.47
Lead pipes are not safe for carraying drinking water, because water, containing dissolved oxygen attacks lead thereby forming poisonous Pb(OH)₂. Lead pipes are readily corroded by
Dilute HC₁
Acetic acid
v
None of these
Q.48
Hydrochloric acid is __________ corrosive to common metals.
Least
Not
Mildly
Highly
Q.49
Nickel base alloys with __________ are known as monel metal.
Zinc
Tin
Copper
Molybdenum
Q.50
Failure of a material is termed as fatigue failure, if it fails below the yield point. The resistance to fatigue failure of a material is measured by the
Ultimate tensile strength (U.T.S.)
Endurance limit
Elastic limit
None of these
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