Mass Transfer

Question: Adsorption is an unit operation which generally involves __________ systems.
[A].

liquid-solid

[B].

gas-solid

[C].

fluid-solid

[D].

solid-solid

Answer: Option C

Explanation:

No answer description available for this question.

Question: Mechanism of moisture removal in case of freeze drying of food stuff is by
[A].

evaporation

[B].

sublimation

[C].

dehydration

[D].

adsorption

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: Even though bubble cap towers are very effective for humidification operation, they are not used commonly in industries, because of the
[A].

high evaporation losses of water.

[B].

high pressure drop of the gas.

[C].

difficulty in its fabrication.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Entrainer used in azeotropic distillation should
[A].

form a low boiling azeotrope with one of the constituents of the mixture.

[B].

form a new azeotrope of low relative volatility with one of the constituents of the mixture.

[C].

have high latent heat of vaporisation.

[D].

have high viscosity to provide high tray efficiency.

Answer: Option A

Explanation:

No answer description available for this question.

Question: For a binary mixture with low relative volatility,
[A].

use steam distillation.

[B].

use molecular distillation.

[C].

use high pressure distillation.

[D].

an azeotrope may be formed during distillation.

Answer: Option D

Explanation:

No answer description available for this question.

Question: Experimental determination of __________ is done by wetted wall column method.
[A].

diffusion co-efficient

[B].

mass transfer co-efficient

[C].

NTU

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Azeotropic distillation is employed to separate
[A].

constant boiling mixture.

[B].

high boiling mixture.

[C].

mixture with very high relative volatility.

[D].

heat sensitive materials.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature)
[A].

log P vs . T

[B].

log P vs. log T

[C].

T vs . P

[D].

P vs . log T

Answer: Option A

Explanation:

No answer description available for this question.

Question: Large scale usage of flash distillation is practised in
[A].

soap manufacturing

[B].

ammonia synthesis plant

[C].

polymerisation industry

[D].

petroleum refinning

Answer: Option D

Explanation:

No answer description available for this question.