Chemical Engineering - Mass Transfer

26. 

At equilibrium the concentration of water in vapour phase (C*)in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

A. 0.0
B. 0.2
C. 0.4
D. 1.0

Answer: Option C

Explanation:

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27. 

Dry bulb temperature of unsaturated air is more than its __________ temperature.

A. dew point
B. wet bulb
C. both 'a' & 'b'
D. neither 'a' nor 'b'

Answer: Option C

Explanation:

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28. 

For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of h2/ky.Cz is around

A. 0.60
B. 0.24
C. 1
D. 0.72

Answer: Option C

Explanation:

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29. 

The reciprocal of stripping factor is termed as

A. selectivity index
B. relative volatility
C. absorption factor
D. Murphree efficiency

Answer: Option C

Explanation:

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30. 

Ponchan-Savarit method analyses the fractional equipment based on

A. enthalpy balance only.
B. material balance only.
C. both enthalpy and material balances.
D. the assumption of constant molaloverflow.

Answer: Option C

Explanation:

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