Chemical Engineering - Mass Transfer

16. 

In the absorption of ammonia in water, the main resistance to absorption is by the __________ phase.

A. liquid
B. gas
C. both (a) & (b)
D. neither (a) nor (b)

Answer: Option B

Explanation:

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17. 

Drying of refractory is normally carried out in a __________ dryer.

A. open pan
B. tray
C. rotary vacuum
D. truck/tunnel.

Answer: Option D

Explanation:

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18. 

The expression, ln(F/W) = is

A. differential distillation equation
B. for NtoG in absorption for dilute mixture
C. slope of q-line in McCabe-Thiele method
D. for relative volatility

Answer: Option A

Explanation:

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19. 

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using

A. liquid extraction
B. distillation
C. evaporation
D. absorption

Answer: Option A

Explanation:

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20. 

When the solvent dissolves very little of solute, then

A. solvent of low latent heat of vaporisation should be used.
B. solvent of low freezing point should be used.
C. large quantity of solvent is required to extract the solute.
D. very small quantity of solvent is required.

Answer: Option C

Explanation:

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