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Q.1
Which of the following is not an alloy of nickel and chromium?
Inconel
Hastealloy
Nimonic alloys
Duralumin
Q.2
Common house hold glass (i.e., soda-lime glass) is a/an __________ material.
Fully crystalline
Partly crystalline
Amorphous
None of these
Q.3
In SO₃ absorber (Contact Process), packing material used is of
Cast iron
Chemical stoneware
Karbate
Mild steel
Q.4
Pick the odd man out of the following.
Calorising
Pack carburising
Nitriding
Cyaniding
Q.5
For handling sulphuric acid of 95% strength, the suitable material of construction for pipes is
Stainless steel
Cast iron
Aluminium
Nickel
Q.6
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
Q.7
To improve the machinability of steel by its softening, it is subjected to
Cold working
Annealing
Shot blasting
Heating
Q.8
Which of the following is the most widely used insulating material for steam carray-ing pipelines?
Ceramic fibre blanket
Glass wool and 85% magnesia
Vermiculite
Slag wool
Q.9
18/8 stainless steel means, that it contains
18% chromium and 8% nickel
18% chromium and 8% molybdenum
18% nickel and 8% chromium
18% molybdenum and 8% chromium
Q.10
The high expansion metal normally used in the bimetallic thermometer is __________ temperature measurement.
Brass for low
Nickel alloys for high
Both A & B
Aluminium for all
Q.11
A metallic alloy in which one of the constituent metal is __________ , is called an amalgam.
Zinc
Mercury
Lead
Tin
Q.12
The process of heating the cold pressed metallic powder is called __________ in powder metallurgy.
Precipitation
Fusion
Sintering
Agglomeration
Q.13
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
Q.14
Addition of nickel to copper improves its
Machinability
Ductility
Strength
Hardness
Q.15
The material used in the filament of electric bulbs is
Nichrome
Tungsten
Constantan
German silver
Q.16
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
Q.17
Presence of even 0.005% of __________ in copper makes it highly brittle, rendering it useless for wire-drawing.
Oxygen
Arsenic
Antimony
Bismuth
Q.18
Maximum consumption of lead is in the manufacture of
Storage batteries
Solder alloys
Electric cable sheathing
Lead lined vessels
Q.19
To improve the machinability of steel, it is generally subjected to
Spheroidising
Tempering
Normalising
Annealing
Q.20
In hot wire aneomometer used for gas flow measurement, the wire is normally made of
Copper
Platinum
Constantan
Chromium
Q.21
A magnetic material becomes __________ above the Curie temperature.
Ferromagnetic
Diamagnetic
Paramagnetic
None of these
Q.22
Percentage of silver in German silver is
5
10
20
0
Q.23
Sulphuric acid pickling tanks are lined with
Nickel
Rubber
Aluminium
Glass
Q.24
__________ is not a case hardening process.
Carburising
Nitriding
Cyaniding
Annealing
Q.25
Gunmetal and bronze are not corroded by the action of
Wet chlorine
Synthetic detergent solution
Hydrochloric acid (10%)
Nitric acid (< 25%)
Q.26
Which of the following metals in not used for coating of the base metal to guard it against corrosion?
Lead
Cadmium
Magnesium
Aluminium
Q.27
__________ is a donor impurity for semi-conductors.
Boron
Antimony
Gallium
None of these
Q.28
Copper is dissolved from its ore by H₂SO₄ in a percolation tank made of
Wood
Stainless steel
Reinforced concrete lined with lead
High silicon iron (14% Si)
Q.29
Steel will respond to hardening by heat treatment processes, only when the minimum carbon content in it is __________ percent.
0.02
0.2
0.35
0.5
Q.30
Coke oven walls are lined with __________ bricks.
Silica
Tar-dolomite
Low thermal conductivity
Fire clay
Q.31
Babbit metal (used for making bearings) comprises of
Mainly tin (85%) and lead
Saw dust and iron dust mixture
Zinc and aluminium
Copper and aluminium
Q.32
Which of the following is produced by condensation polymerisation?
Bakelite
Polythene
Poly vinyl chloride
Polystyrene
Q.33
Balls in a ball mill are usually made of
Steel
Cast iron
Stainless steel
Bronze
Q.34
Concentrated HCl at 30°C can be stored in a vessel made of
PTFE and porcelain
Cast iron and aluminium
Stainless steel and high silicon cast iron
None of these
Q.35
__________ iron is produced, when molten pig iron is chilled suddenly.
White cast
Grey cast
Wrought
None of these
Q.36
Glass lined vessels are not used for handling/storing
Dilute H₂SO₄
Dilute HNO₃
Dilute HCl
Hydroflouric acid
Q.37
Hydrochloric acid is stored in a __________ steel vessel.
Lead lined
Rubber lined
Glass lined
Stainless
Q.38
Alpha iron is stable __________ °C.
Above 1403
Upto 910
Above 1800
Between 910 & 1403
Q.39
__________ iron is produced, when molten pig iron is allowed to cool gradually.
White cast
Grey cast
Wrought
None of these
Q.40
Pipes for bi-cycle frames are made of __________ steel.
Hot rolled
Chrome carbon
Cold rolled
Stainless
Q.41
Approximate value of the modulus of elasticity for steel is about __________ x l0⁶kg/cm².
0.5
2
40
75
Q.42
The chlorinator used in the manufacture of DDT is made of
Glass
Glass lined steel
Teflon
Bakelite
Q.43
Presence of even very minute amount (say 0.1%) of __________ in copper, reduces its electrical conductivity very seriously.
Bismuth
Arsenic
Antimony
Both B and C
Q.44
Thermometer bulb & capillary in case of mercury filled pressure spring expansion thermometer is normally made of __________ as mercury does not amalgamate with it.
Copper
Copper alloys
Stainless steel
Monel
Q.45
Brine (15% concentration) can be stored in a vessel made of
Monel
Karbate
Cast iron
None of these
Q.46
A bearing metal should not have
Enough plasticity
Low thermal conductivity
Low co-efficient of friction
High toughness
Q.47
Which one is remelted and poured into moulds to get cast iron?
Wrought iron
Pig iron
Low carbon steel
Mild steel
Q.48
Reactor used in the production of polyvinyl chloride (PVC) is made of
Nickel or glass lined steel
Aluminium
Tantalum
Lead
Q.49
Which of the following is not a nickel based alloy?
Inconel
Hastelloys
Nimonics
Babbit metal
Q.50
Rubber lined pumps can be used to pump
Caustic soda
Chlorinated brine
Hypochlorous acid
All of the above
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