Chemical Engineering - Mass Transfer

11. 

As complete saturation of an adsorbent is approached, the differential heat of adsrop-tion approaches

A. that of normal condensation.
B. integral heat of adsorption.
C. zero.
D. none of these.

Answer: Option A

Explanation:

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12. 

'Absorption with chemical reaction' is involved in the removal of

A. carbon dioxide from gaseous stream using alkaline solution.
B. benzol from coke oven gas using solar oil/wash oil.
C. ammonia from coke oven gas using refrigerated water.
D. tar from coke oven gas in primary gas coolers using chilled water.

Answer: Option A

Explanation:

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13. 

The-relative volatility for separation of a non-ideal binary mixture by distillation should be

A. 0
B. 1
C. > 1
D. < 1

Answer: Option C

Explanation:

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14. 

Pick out the wrong statement:

A. Reboiler is not used in open steam distillation.
B. The separation of solutes of different molecular sizes in a liquid solution by use of a suitable membrane is called dialysis.
C. Freeze drying is used for the drying of fish.
D. Fenske-Underwood equation is used for calculating theoretical number of plates in a distillation column at normal operating reflux condition.

Answer: Option D

Explanation:

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15. 

In paper industry, paper is dried in a __________ dryer.

A. tunnel
B. heated cylinder
C. conveyor
D. festoon

Answer: Option B

Explanation:

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