Chemical Engineering - Mass Transfer

31. 

As the reflux ratio in a distillation coloumn is increased from the minimum, the

A. slope of the operating line in stripping section decreases.
B. number of plates decreases very slowly first and then more and more rapidly.
C. total cost first decreases and then increases.
D. liquid flow increases while the vapor flow decreases for a system.

Answer: Option C

Explanation:

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32. 

Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)

A. S2/S1
B. S1/S2
C. S1 - S2
D. S1 x S2

Answer: Option B

Explanation:

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33. 

A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids ?

A. 0
B. 1
C. 2
D. 3

Answer: Option A

Explanation:

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34. 

Which of the following remains constant during sensible cooling process ?

A. Specific humidity
B. Partial pressure of vapour
C. Both (a) and (b)
D. Neither (a) nor (b)

Answer: Option C

Explanation:

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35. 

Physical absorption is

A. an irreversible phenomenon.
B. a reversible phenomenon.
C. accompanied by evolution of heat.
D. both (b) and (c)

Answer: Option D

Explanation:

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