Chemical Engineering - Mass Transfer

41. 

A good solvent used for absorption should not have very high

A. viscosity
B. vapor pressure
C. freezing point
D. all (a), (b) & (c)

Answer: Option D

Explanation:

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42. 

In a counter-current liquid extractor

A. both liquids flow at fixed rate.
B. both liquids can have any desired flow rate.
C. only one of the liquids may be pumped at any desired rate.
D. liquid's flow rate depends upon the temperature and pressure.

Answer: Option C

Explanation:

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43. 

Which of the following is an undesirable property for an absorbing solvent ?

A. Low vapour pressure
B. Low velocity
C. Low freezing point
D. None of these

Answer: Option D

Explanation:

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44. 

The wetted wall tower is used to determine

A. individual mass transfer co-efficient (M.T.C.) in gaseous system.
B. M.T.C. of individual components in a liquid-liquid system.
C. M.T.C. of liquid in liquid-gas system.
D. the overall M.T.C. of the system.

Answer: Option A

Explanation:

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45. 

Weight of 1 m3 of humid air as compared to 1 m3 of dry air, under the same conditions, is

A. less
B. more
C. same
D. unpredictable

Answer: Option A

Explanation:

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