Mechanical Operations - Chemical Engineering Questions and Answers

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Pick out the correct statement.

Plastic chips are called non-cohesive solids.

Kick's crushing law is, P/m = K . ln

Communition is a generic term for size enlargement operation.

Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'.

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If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

linear speed of the basket is doubled.

linear speed of the basket is halved.

centrifugal force is doubled.

capacity of centrifuge is increased.

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The ratio of the area of openings in one screen (Taylor series) to that of the openings in the next smaller screen is

1.5

none of these

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Mixing of plastic solids is generally facilitated by

dispersion

mastication

kneading

none of these

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The mechanism of size reduction by a hammer mill is by impact and attrition between the

grinding element & the housing.

feed particles.

both (a) and (b).

neither (a) nor (b).

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Which of the following is not an industrial screening equipment ?

Sharpies centrifuge

Vibrating screen

Grizzly

Trommel

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Which of the following is not a wet classifier ?

Sharpies supercentrifuge

Hydrocyclones

Dorr Oliver rake classifier

None of these

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Helical screw agitator is used for

mixing highly viscous pastes.

blending immiscible liquids.

mixing liquids at very high temperature (> 250 °C).

none of these.

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For raschig rings, the sphericity is

0.5