Chemical Engineering - Mass Transfer

46. 

In distillation columns, the number of bubble caps per tray primarily depends upon the

A. allowable liquid velocity.
B. allowable gas velocity.
C. allowable gas and liquid velocities.
D. feed composition.

Answer: Option C

Explanation:

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47. 

In distillation, overhead product contains

A. only one component
B. two components
C. any number of components
D. only saturated liquid

Answer: Option C

Explanation:

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48. 

With increase in pressure, the relative volatility for a binary system

A. increases.
B. decreases.
C. remains same.
D. either (a) or (b), depends on the system.

Answer: Option B

Explanation:

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49. 

Low viscosity absorbent is preferred for reasons of

A. rapid absorption rates and good heat transfer characteristics.
B. improved flooding characteristics.
C. low pressure drop on pumping.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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50. 

Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

A. KD
B. KD
C. KD1.5
D. KD2

Answer: Option A

Explanation:

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