Chemical Engineering - Mass Transfer

6. 

Total reflux in a distillation operation requires minimum

A. reboiler load
B. number of plates
C. condenser load
D. all (a), (b) and (c)

Answer: Option B

Explanation:

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7. 

The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

A. raising the temperature.
B. lowering the total pressure.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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8. 

The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is

A. +ve
B. -ve
C. zero
D. none of these

Answer: Option A

Explanation:

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9. 

Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

A. relative volatility is reasonably constant.
B. mixture (to be separated) shows negative deviation from ideality.
C. mixture (to be separated) shows positive deviation from ideality.
D. multicomponent distillation is involved.

Answer: Option A

Explanation:

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10. 

When the temperature and humidity of air is low, we usually use __________ draft cooling tower.

A. natural
B. forced
C. induced
D. none of these

Answer: Option A

Explanation:

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