Chemical Engineering - Mass Transfer

36. 

For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).

A. 1-5
B. 10-60
C. 200-300
D. > 500

Answer: Option B

Explanation:

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37. 

For absorbing a sparingly soluble gas in a liquid

A. gas side mass transfer co-efficient should be increased.
B. liquid side mass transfer co-efficient should be increased.
C. liquid side mass transfer co-efficient should be decreased.
D. mass transfer co-efficient must be kept constant.

Answer: Option B

Explanation:

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38. 

Channelling in a packed tower results from the

A. high pressure drop
B. maldistribution of liquid
C. non-uniformity of packing
D. both (b) and (c)

Answer: Option D

Explanation:

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39. 

The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or "outgassed" adsorbent to from a definite concentration of adsorbate is called its

A. integral heat of adsorption.
B. heat of wetting.
C. differential heat of adsorption.
D. heat of normal condensation.

Answer: Option A

Explanation:

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40. 

The minimum number of theoretical plates is required for achieving a given separation in distillation column with

A. no reflux
B. total reflux
C. zero reflux ratio
D. minimum reflux ratio

Answer: Option B

Explanation:

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