Chemical Engineering - Mass Transfer

11. 

Pick out the correct statement.

A. In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity.
B. With increase in temperature, the selectivity of the solvent used in solvent extraction decreases.
C. The selectivity of solvent used in solvent extraction is unity at the plait point.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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12. 

__________ columns are used for liquid dispersion in a continuous gas phase.

A. Packed
B. Pulse
C. Bubble cap
D. Sieve plate

Answer: Option A

Explanation:

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13. 

Overall efficiency of the distillation column is

A. the ratio of number of ideal plates to actual plates.
B. the ratio of number of actual plates to ideal plates.
C. same as the Murphree efficiency.
D. always more than the point efficiency.

Answer: Option A

Explanation:

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14. 

On addition of solute in the solvent, the __________ of the solution decreases.

A. boiling point
B. freezing point
C. vapour pressure
D. both (b) and (c)

Answer: Option D

Explanation:

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15. 

Which is the controlling factor for a drum drier?

A. Diffusion
B. Heat transfer
C. Both (a) and (b)
D. Neither (a) nor (b)

Answer: Option B

Explanation:

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