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
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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
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Most of the common metals have __________ crystal structure.
A. Cubic
B. Hexagonal
C. Orthorhombic
D. None of these
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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
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Liners of a ball mill are never made of
A. Lead
B. Alloy steel
C. Rubber or ceramic material
D. Cast iron
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Approximate value of the modulus of elasticity for steel is about __________ × 106 kg/cm2 .
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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
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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
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Brinell Hardness Number (BHN) for talc is approximately in the range of
A. 1-5
B. 20-30
C. 100 -150
D. 200 - 250
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Rubber lined vessels are corroded by the action of
A. Aqua regia
B. Chloroform
C. Sulphuric acid (95%)
D. All of the above
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Pipes for bi-cycle frames are made of __________ steel.
A. Hot rolled
B. Chrome carbon
C. Cold rolled
D. Stainless
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Nickel and copper are the basic constituents of
A. Hastelloy
B. Monel metal
C. German silver
D. Inconel
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Nickel and molybdenum are the basic constituents of
A. Hastealloy
B. German silver
C. Inconel
D. Solder
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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
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The increase in hardness of metal due to its cold working is termed as the __________ hardening.
A. Work
B. Age
C. Induction
D. Flame
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Balls in a ball mill are usually made of
A. Steel
B. Cast iron
C. Stainless steel
D. Bronze
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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
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Brine (15% concentration) can be stored in a vessel made of
A. Monel
B. Karbate
C. Cast iron
D. None of these
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A bearing metal should not have
A. Enough plasticity
B. Low thermal conductivity
C. Low co-efficient of friction
D. High toughness
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White cast iron as compared to grey cast iron is
A. More durable
B. Very brittle
C. Very hard
D. All of the above
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