Chemical Engineering - Mechanical Operations

1. 

Pick out the wrong statement.

A. For the compressible cake, voidage & the specific resistance of the cake can be assumed to be constant.
B. Cake resistance is independent of the pressure drop.
C. Crushing of explosive materials are done by employing drygrinding.
D. Gyratory crusher is a coarse crusher.

Answer: Option B

Explanation:

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2. 

Which of the following oxides is not present in hematite iron ore?

A. Titanium oxide
B. Calcium oxide
C. Cobalt oxide
D. Manganese oxide

Answer: Option C

Explanation:

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3. 

Ribbon blenders are exclusively meant for

A. blending miscible liquids.
B. non-flowing powder and thin pastes.
C. bath mixing.
D. continuous mixing.

Answer: Option B

Explanation:

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4. 

In closed circuit grinding as compared to open circuit grinding, the

A. specific surface of product is more.
B. product has lesser size uniformity.
C. production rate at a given limiting size is lower.
D. operation is economical.

Answer: Option D

Explanation:

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5. 

Pick out the correct statement.

A. Angle of repose is always greater than the angle of slide.
B. A hopper is a small bin with a sloping bottom.
C. A silo is a short height vessel of very large diameter used for the storage of high volatile matter coal.
D. Pine oil is used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process.

Answer: Option B

Explanation:

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