Chemical Engineering - Mass Transfer

31. 

With increase in the concentration of the adsorbate, the integral heat of adsorption

A. increases.
B. decreases.
C. remains unchanged.
D. may increase or decrease ; depends on the type of adsorbate.

Answer: Option B

Explanation:

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32. 

Small dia distillation column can be a

A. packed column
B. sieve tray
C. bubble cap
D. any of these

Answer: Option A

Explanation:

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33. 

If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

A. 0
B. 1
C. < 1
D. > 1

Answer: Option B

Explanation:

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34. 

An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively.The humidity of air sample expressed as kg of water vapour/kg of dry air is

A. 0.048
B. 0.079
C. 0.122
D. 0.152

Answer: Option D

Explanation:

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35. 

__________ column is used in gas absorption process.

A. Wetted wall
B. Seive/perforated tray
C. Bubble cap
D. Packed

Answer: Option D

Explanation:

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