Materials and Construction - Chemical Engineering Questions and Answers

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Brass tubes are used in the manufacture of tubes of evaporators used in sugar and salt industries, mainly because of its

high co-efficient of thermal expansion.

low thermal conductivity.

high corrosion resistance.

all (a), (b) and (c).

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Pick out the wrong statement.

Alloys are harder than their component elements.

Presence of silicon in steel decreases its electrical resistance.

Karbate is an acid resistant material of construction.

Nichrome, a steel alloyed with 10% Ni and 20% Cr can be used upto a temperature of 1100°C.

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Ferric stainless steels compared to austenitic stainless steels

have lower corrosion resistance.

are harder to fabricate.

are less ductile and hence less suitable for cold pressing.

all (a), (b) and (c).

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Liners of a ball mill are never made of

lead

alloy steel

rubber or ceramic material

cast iron

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Most of the common metals have __________ crystal structure.

cubic

hexagonal

orthorhombic

none of these

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Cast iron is a __________ material.

brittle

ductile

tough

malleable

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Hydrocyanic acid is not shipped in

cast iron vessels.

steel cylinders.

aluminium containers.

monel drums.

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Spark plugs are made of

high alumina ceramic

metallic carbides

corundum

carborundum

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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