Chemical Engineering - Mass Transfer

1. 

Boiling point diagram is

A. not affected by pressure.
B. affected by pressure.
C. a plot of temperature vs. liquid composition.
D. a plot of temperature vs. vapour composition.

Answer: Option B

Explanation:

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2. 

When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system,

A. as the acetone concentration increases, the solubility curves approach each other.
B. both the phases become identical at a particular common point on both the solubility curves called the plait point.
C. the distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption terminates on the x = y diagonal at the concentration of the plait point.
D. all (a), (b) and (c).

Answer: Option D

Explanation:

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3. 

Steam distillation is used to

A. reduce the number of plates.
B. avoid thermal decomposition of a component.
C. increase the efficiency of separation.
D. increase the total pressure of distillation.

Answer: Option B

Explanation:

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4. 

Freundlich equation applies to the adsorption of solute from

A. dilute solutions, over a small concentration range.
B. gaseous solutions at high pressure.
C. concentrated solutions.
D. none of these.

Answer: Option A

Explanation:

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5. 

For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

A. no change in theoretical
B. marginal decrease in the number of
C. major decrease in the number of
D. none of these

Answer: Option B

Explanation:

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