Chemical Engineering - Mass Transfer

46. 

For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

A. Re0.33
B. Re0.53
C. Re0.83
D. Re

Answer: Option C

Explanation:

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47. 

The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

A. temperature rises.
B. pressure rises.
C. temperature falls.
D. pressure falls.

Answer: Option A

Explanation:

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48. 

Unit of molal diffusivity is

A. cm2/sec gm . mole
B. gm moles/cm2 . sec
C. gm moles/cm. sec
D. gm moles/cm2. sec

Answer: Option C

Explanation:

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49. 

The term "approach" in a cooling tower refers to the difference in the temperature of the

A. cold water leaving the tower and the wet bulb temperature of the surrounding air.
B. hot water entering the tower and the wet bulb temperature of the surrounding air.
C. hot water entering and the cooled water leaving the cooling tower.
D. none of these

Answer: Option A

Explanation:

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50. 

Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

A. unidirectional diffusion from liquid to gas phase
B. unidirectional diffusion from gas to liquid phase
C. either 'a' or 'b'
D. a counter diffusion at an almost equal molar rate

Answer: Option D

Explanation:

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