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Quiz 6
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Q.1
Spark plugs, ignition tubes and electrodes are made of nickel __________ alloys.
Beryllium
Manganese
Copper
Iron
Q.2
The purpose of nitriding the steel is to
Harden its surface
Soften its surface
Improve its reliability
None of these
Q.3
The temperature at which new grains are formed in the metal is called the __________ temperature.
Eutectic
Recrystallisation
Upper critical
Lower critical
Q.4
A material capable of undergoing large permanent deformation, when subjected to compression is termed as
Malleable
Ductile
Brittle
None of these
Q.5
The loss of strength in compression which occurs, when there is a gain of strength in tension due to over loading is called
Bauschinger effect
Hooke's effect
Hysterisis
Relaxation
Q.6
Duralumin is an alloy of
Aluminium, copper and manganese
Aluminium, nickel and silicon
Aluminium and nickel
None of these
Q.7
Duriron is
Acid resistant, brittle and very hard
High silicon iron
Prone to breakage due to thermal expansion because of its very high co-efficient of thermal expansion
All of the above
Q.8
__________ does not contain copper as an alloying element,
Nichrome
Manganin
Perminivar
Monel metal
Q.9
Copper has very low
Malleability
Ductility
Tensile strength
Thermal & electrical conductivity
Q.10
Hardest materials so far found is
Diamond
Graphite
Carborundum
Pumice stone
Q.11
Polymerisation reactor used for the production of styrene butadiene rubber (SBR) is made of
Cast iron
Stainless steel or glass lined vessel
Karbate
Wrought iron
Q.12
Which of the following is produced by addition polymerisation?
Polybutadiene
Phenol formaldehyde
Urea-formaldehyde
Dacron
Q.13
Ammonium chloride solution is stored/ treated in __________ vessels/pipes.
Plain carbon steel
Stainless steel
Rubber or durmet-20 lined
Lead
Q.14
Wood metal is not used for making
Soft solder
Casting for dental work
Storage tank for storing brine and caustic soda
Fusible safety plug for pressure cooker
Q.15
Plasticisers are added to polymers to improve their
Tensile strength
Softness & flexibility
Acid resistance
Alkali resistance
Q.16
DDT is shipped in
Stainless steel containers
Paper bags
Fibre drums
Either B or C
Q.17
'Age hardening' of duralumin is due to
Copper
Magnesium
Both A & B
Neither A nor B
Q.18
Chilled iron castings are
Easily machinable
Soft on surface
Highly wear resistant
None of these
Q.19
Refined acetic acid storage vessel are made of
Copper
Aluminium
High carbon steel
Nickel
Q.20
Nickel is a __________ material.
Ferromagnetic
Diamagnetic
Paramagnetic
None of these
Q.21
Bearings subjected to light load are made of
White metal
Phosphorous bronze
Monel
Silicon bronze
Q.22
Caustic soda is produced in a mercury cell having anode and cathode made respectively of moving mercury and
Moving mercury and graphite
Graphite and moving mercury
Moving mercury and carbon
Moving mercury and crimped steel wire
Q.23
In the kraft (sulphate) process for the paper manufacture, the digestor is made of
Cast iron
Stainless steel
Karbate carbon
Wrought iron
Q.24
Polymerisation reactor used in the production of styrene butadiene rubber (SBR) is made of
Stainless steel or glass lined steel
Nickel clad steel
High silicon cast iron
Aluminium
Q.25
Evaporators used in caustic soda recovery and production plant are made of
Monel metal
Gun metal
Wood metal
Babbit metal
Q.26
Silicon percentage in acid resistant cast iron is about
4
8
14
20
Q.27
Constantan is an alloy of
Cu (55%) & Sn (45%)
Cu (55%) & Ni (45%)
Pt (95%) & Rh (10%)
Fe (80%) & Ni (20%)
Q.28
The fermentor used for the production of ethyl alcohol from molasses is made of
Wood
Concrete
Copper bearing steel
Procelain
Q.29
The heat treatment process to which castings and the steel balls produced by cold heading are subjected is
Tempering
Normalising
Annealing
None of these
Q.30
Alinco, which is a aluminium-cobalt-nickel steel, is used for making
Surgical instruments
Powerful magnets
Chemical equipments
Boiler tubes
Q.31
Biological shield in a nuclear power reactor is made of
Concrete
Steel
Cadmium
Zircalloy
Q.32
Ceramic materials are
Organic in nature
Stronger in compression than in tension
Always amorphous in nature
Always bad heat conductors
Q.33
Cermets are used for making
Cutting tools
Abrasives
Both A & B
Neither A nor B
Q.34
Interchain forces are the weakest in case of
Plastics
Fibres
Elastomers
Both rubber & elastomers
Q.35
Which of the following comprises of hydrocarbons?
Mica flakes
Glass
Rubber
None of these
Q.36
Specify the material of construction suitable for handling concentrated HNO₃ at 100°C.
High silicon iron, Kel-F and teflon
Tin and wood
Silicone rubber
Stainless steel
Q.37
Which of the following is not an alloy of copper?
Muntz metal
Admirability gun metal
German silver
Pewter metal
Q.38
Addition of lead, sulphur and phosphorus to low carbon steel helps in improving its
Corrosion resistance
Tensile strength
Machinability
Compressive strength
Q.39
Constituents of stellite are
Zinc, copper and nickel
Cobalt, chromium and tungsten
Zinc, aluminium and nickel
Nickel, cobalt and vanadium
Q.40
Polythene (low or high density) containers are not corroded by
Sulphuric acid (10%) at room temperature
Nitric acid (95%) at room temperature
Sulphur trioxide at 60°C
Any of these
Q.41
The behaviour of visco-elastic material is time dependent. This behaviour is commo in __________ materials.
Non-crystalline solid
Crystalline
Rubberry
Non-crystalline organic polymeric
Q.42
Cast iron compared to steel is better in
Ductility
Fluidity & castability
Strength
Malleability
Q.43
Acetylene gas holder is made of
Copper
Cast iron
Steel
Monel metal
Q.44
Low carbon steels are those in which carbon percentage is around
0.1 to 0.35
0.4 to 0.7
0.8 to 1.5
1.5 to 2
Q.45
Softness of silver can be converted into hardness by alloying it with small quantity of
Copper & nickel
Zinc
Aluminium
Tin
Q.46
Tempering of steel is done to make it
Brittle
Hard
Rollable
Soft
Q.47
Maximum permissible sulphur content in steel is __________ percent.
0.015
0.055
0.505
0.805
Q.48
Carbon content in steel is __________ percent.
0.1-2
4-6
2-4
0.001-0.01
Q.49
Carbon content in plain carbon steel is __________ percent.
0.1 to 0.15
0.35 to 0.45
0.65 to 0.80
0.85 to 1.2
Q.50
Constantan used in thermocouples is an alloy of
Iron & copper
Copper & aluminium
Lead & tin
None of these
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