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Q.1
Which metal is protected by the layer of its own oxide?
Iron
Silver
Calcium
Aluminium
Q.2
Light weight metallic alloy used in aircraft industry is
Aluminium
High silicon (14%) iron
Duralumin
Phosphor bronze
Q.3
Zinc is not used
For producing zinc base die casting alloys
In its oxide form as pigments
As anode for corrosion prevention in boiler
As an alloying element in various bronzes
Q.4
Cast iron and steel pipes are produced by __________ casting.
Die
Investment
Slush
True centrifugal
Q.5
Super conductors are those substances, which
Offer no resistance to current flow
Conduct electricity at low temperature
Offer high resistance to current flow
Conduct electricity at high temperature
Q.6
Galvanising (i.e., zinc coating) of steel sheets is done to
Prevent its rusting by contact with corrosive atmosphere
Protect the base metal by cathodic protection
Both A & B
Neither A nor B
Q.7
Nickel is a constituent of
Bronze
Solder
Duralumin
Monel metal
Q.8
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%)?
Armature of small motors/generators
Generators and small motors
Induction motors
High frequency transformers
Q.9
Nickel made/clad equipments are suitable for handling
Ammonia (both aqueous & anhydrous)
Fruit juices, milk & its products and caustic soda solution
Nitric acid & hydrochloric acid (conc)
Sulphuric acid (conc)
Q.10
Presence of 0.3 to 0.5% arsenic in copper increases its
Ductility
Malleability
Tenacity & hardness
Electrical conductivity
Q.11
Amount of energy that a material can absorb before its fracture is a measure of its
Toughness
Resilience
Malleability
Ductility
Q.12
Residual magnetism in steel for magnets is increased by the addition of
Nickel
Cobalt
Tungsten
Chromium
Q.13
Which of the following heat treatment processes is used for softening the hardened material?
Normalising
Tempering
Annealing
None of these
Q.14
Stainless steel is not corroded by
Hydrochloric acid (10%)
Nitric acid (10%)
Sulphuric acid (10%)
Saturated brine
Q.15
Which of the following stainless steels is non-magnetic?
Ferritic
Martensitic
Austenitic
None of these
Q.16
Which of the following alloy steels has the energy saving properties making it suitable for use in electrical machines?
Silicon steel
Chromium steel
Molybdenum steel
None of these
Q.17
Steel tower used for the storage of oleum
Is lined with lead
Need not be lined
Is lined with rubber
Is lined with acid-proof bricks
Q.18
__________ moulding process can not be used for thermoplastic plastics.
Compression
Extrusion
Injection
None of these
Q.19
Carbon tetrachloride can be stored in a storage vessel made of
High silicon iron (14% Si)
Tin
Stainless steel
All of the above
Q.20
The addition of antimony in tin-based alloys improves its
Rupture strength and hot hardness
Impact strength and bonding strength
Deformation resistance
Wear resistance
Q.21
The heat treatment process applied to cold formed steel parts is
Normalising
Tempering
Artificial ageing
Solution annealing
Q.22
The softest material just next to talc in the Mho's scale is
Quartz
Gypsum
Feldspar
Fluorite
Q.23
Slow and progressive deformation of a material with time under constant stress is called
Creep
Erosion
Resilience
None of these
Q.24
Which of the following is not used as the ceramic material in 'cermets'?
Silicides
Oxides
Carbides
Nitrides
Q.25
The most resistant material to alkaline corrosion is
Duriron
Nickel
Aluminium
Karbate
Q.26
Iron alloyed with carbon upto 2% is called
Pig iron
Wrought iron
High carbon steel
None of these
Q.27
A suitable material of construction to use with fuming sulphuric acid is
Carbon steel
Stainless steel type 304
Nickel
Monel
Q.28
Gas holder of a gobar (cowdung) gas plant is made of
Molybdenum stainless steel
Tin
Mild steel
Aluminium
Q.29
100% H₂SO₄ at 30°C can't be stored in a vessel made/lined with
Cast iron and high silicon iron
Mild steel and stainless steel
Aluminium, tin and rubber
Teflon, glass and porcelain
Q.30
Mercury is transported in metal containers made of
Aluminium
Iron
Lead
Nickel
Q.31
Mercury is transported in metal containers made of
Aluminium
Iron
Lead
Nickel
Q.32
__________ can replace tungsten in high speed steel,
Chromium
Vanadium
Cobalt
Molybdenum
Q.33
Which of the following undergoes granular fracture?
Wrought iron
Steel
Cast iron
None of these
Q.34
Lead alone is not used in storing equipment, because it
Is very costly
Corrodes easily
Is having low creep strength
None of these
Q.35
Tubes of multiple effect evaporator used for concentration of sugar cane juice are made of
Nickel
Copper
Stainless steel
Brass
Q.36
Mixing vessel used for the chlorination of methane to produce methyl chloride is made of
Copper
Cast iron
Aluminium
High carbon steel
Q.37
Cast iron has
Very high tensile strenth
High ductility
High malleability
Elastic limit close to ultimate breaking strength
Q.38
Bush bearings are made of
Mild steel
Phosphorous bronze
White metal alloys
None of these
Q.39
Hydrochloric acid is stored in a__vessel.
Lead lined steel
Rubber lined steel
Stainless steel
Cast iron
Q.40
High speed steel tools retain their hardness upto a temperature of __________ °C.
500
750
900
1100
Q.41
The material of construction of pressure mills used for squeezing out the juice from sugar cane is
Stainless steel
Cast iron
Mild steel
Monel
Q.42
Cementite is
Fe₃C chemically
A compound of carbon and iron
Characterised by an orthorhombic crystal structure
All of the above
Q.43
Dead mild steel, which contains 0.10 to 0.15 percent carbon is used for making
Shafts
Flanges
Gears
Shear blades
Q.44
How many atoms are there per unit cell in a body centred cubic lattice system?
2
3
4
6
Q.45
Caustic soda can be stored in __________ drums.
Steel
Cast iron
Brass
Gun metal
Q.46
Vessels made of __________ can be used to store dry chlorine.
Thermoplastic materials
Nickel
Steel or iron
None of these
Q.47
Cast iron has very high
Compressive strength
Ductility
Shock resistance
Resistance to brittleness
Q.48
Cast iron is
Used for making shock resisting parts
Manufactured in cupola and is brittle
Having compressive strength more than its tensile strength
All of the above
Q.49
Cast iron is having very high
Proximity between its elastic limit and ultimate breaking strength
Ductility
Tensile strength
All of the above
Q.50
Dilute sulphuric acid is transported in __________ pipes.
Mild steel
Lead
Copper
Special alloys
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