Mass Transfer

Question: At a fixed total pressure, humidity depends only on the
[A].

partial pressure of vapour in the mixture.

[B].

heat capacity of the vapour.

[C].

density of the vapour.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Co-current absorbers are usually used when the gas to be dissolved in the liquid is
[A].

sparingly soluble

[B].

highly soluble

[C].

a pure substance

[D].

a mixture

Answer: Option C

Explanation:

No answer description available for this question.

Question: Absorption accompanied by heat evolution results in
[A].

increased capacity of the absorber.

[B].

increase in equilibrium solubility.

[C].

decrease in equilibrium solubility.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Desirable value of absorption factor in an absorber is
[A].

1

[B].

< 1

[C].

> 1

[D].

0.5

Answer: Option C

Explanation:

No answer description available for this question.

Question: HETP is numerically equal to HTU, only when the operating line
[A].

lies below the equilibrium line.

[B].

lies above the equilibrium line.

[C].

and equilibrium lines are parallel.

[D].

is far from the equilibrium line.

Answer: Option C

Explanation:

No answer description available for this question.

Question: For the same system, if the same liquid used in an absorber is decreased, the tower height will
[A].

increase

[B].

decrease

[C].

remain unaffected

[D].

decrease or increase ; depends on the type of liquid

Answer: Option A

Explanation:

No answer description available for this question.

Question: In an absorber, HETP does not vary with the
[A].

flow rate of liquid

[B].

flow rate of gas

[C].

type and size of packing

[D].

none of these

Answer: Option D

Explanation:

No answer description available for this question.

Question: Ammonia present in the coke oven gas is removed by washing with
[A].

caustic solution

[B].

dilute ammoniacal liquor

[C].

dilute HCl

[D].

ethanolamine

Answer: Option B

Explanation:

No answer description available for this question.

Question: For absorbers, high pressure drop results in
[A].

increased efficiency.

[B].

decreased efficiency.

[C].

high operating cost.

[D].

better gas liquid contact.

Answer: Option C

Explanation:

No answer description available for this question.

Question: If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is
[A].

L/G

[B].

G/L

[C].

always < 1

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.