Chemical Engineering

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.

Question: For the same process conditions, the reflux ratio of an unlagged distillation column
[A].

decreases in winter

[B].

increases in winter

[C].

increases in summer

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: 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:

No answer description available for this question.

Question: For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.
[A].

binary mixture is represented by the apex

[B].

binary mixture is represented by any point inside

[C].

ternery mixture is represented by the sides

[D].

pure component is represented by the apex.

Answer: Option D

Explanation:

No answer description available for this question.

Question: For a binary mixture with low relative volatility, continuous rectification to get pure products will require
[A].

low reflux ratio

[B].

less number of trays

[C].

small cross-section column

[D].

high reflux ratio

Answer: Option D

Explanation:

No answer description available for this question.