Mass Transfer

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.

Question: Degree of freedom for leaching and solvent extraction process is
[A].

1

[B].

3

[C].

0

[D].

2

Answer: Option B

Explanation:

No answer description available for this question.

Question: For a binary mixture distillation process, the degree of freedom is 2. However, if the pressure is fixed in this process, the number of independent variables in this process will be
[A].

1

[B].

0

[C].

2

[D].

3

Answer: Option A

Explanation:

No answer description available for this question.

Question: Drying operation under vacuum is carried out to
[A].

dry those materials which have very high unbound mositure content.

[B].

reduce drying temperature.

[C].

increase drying temperature.

[D].

dry materials having high bound moisture content.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In rectifying section of a continuous distillation column, the
[A].

vapour is enriched with low boilers.

[B].

vapour is enriched with high boilers.

[C].

liquid is stripped of high boilers.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of __________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated.
[A].

molecular

[B].

azeotropic

[C].

extractive

[D].

flash.

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.
[A].

Sherwood

[B].

Stanton

[C].

Lewis

[D].

Peclet

Answer: Option C

Explanation:

No answer description available for this question.