Materials and Construction - Chemical Engineering Questions and Answers

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Trough of an apron conveyor is made of

lead lined concrete vessel

wood

metal

either (b) or (c)

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Pick out the wrong statement.

The toughness of a material decreases, when it is heated.

Crane hooks are normally made of wrought iron.

Cold working of a metal decreases its fatigue strength.

The temperature at which new grains are formed in a metal is known as the recrystallisation temperature.

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Which of the following finds the least commercial use ?

Pure iron

High silicon iron

Low carbon steel

High carbon steel

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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

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Silicon percentage in iron castings to have maximum hardness should be about

0.3

0.5

0.8

2.5

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Nickel as a material of construction

is used as an alloying element for both ferrous & non-ferrous alloys.

is paramagnetic below 415° C (its Curie temperature).

dimagnetic.

has a body centred cubic (bcc) crystal lattice structure.

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__________ moulding process can not be used for thermoplastic plastics.

Compression

Extrusion

Injection

None of these

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Which of the following crystal structures characterises the ferritic stainless steel ?

Face centred cubic

Body centred cubic

Simple hexagonal

None of these

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'Semi steel' is

produced by adding 10-20% steel to the cupola charge.

stronger than cast iron.

both (a) and (b).

neither (a) nor (b).