Mass Transfer

Question: Measurement of the interfacial area of mass transfer is achieved easily & accurately in case of a __________ coloumn.
[A].

spray

[B].

packed

[C].

bubble cap plate

[D].

wetted wall

Answer: Option D

Explanation:

No answer description available for this question.

Question: During bottling of cold drinks (e.g. Pepsi), the main resistance to mass transfer for the absorption of carbon dioxide in water lies in the
[A].

gas film

[B].

liquid film

[C].

liquid-gas interface

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: McCabe-Thiele method
[A].

uses molal units for material and energy balance.

[B].

uses weight fractions to express liquid and vapour composition.

[C].

can use any type of units.

[D].

is more accurate than Ponchan-Savarit method.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Advantage of continuous drying over batch drying is that the
[A].

drying cost per unit weight of dried product is less.

[B].

product with more uniform moisture content is produced.

[C].

equipment size required is smaller.

[D].

all ‘a’, ‘b’ & ‘c’

Answer: Option D

Explanation:

No answer description available for this question.

Question: Binary distillation involves the mass transfer by __________ at the gas-liquid interface.
[A].

unidirectional diffusion from liquid to gas phase

[B].

unidirectional diffusion from gas to liquid phase

[C].

either ‘a’ or ‘b’

[D].

a counter diffusion at an almost equal molar rate

Answer: Option D

Explanation:

No answer description available for this question.

Question: A coalescer in a mixer-settler liquid-liquid extraction coloumn
[A].

comprises of thin bed of substances of extended surface having high porosity.

[B].

helps in increasing the bubble size entering the settler.

[C].

helps in increasing the settling rate of the bubbles.

[D].

all ‘a’, ‘b’, & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.

Question: In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in
[A].

reducing the axial mixing.

[B].

increasing the rate of extraction.

[C].

maintaining the concentration difference between the two phases.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.

Question: With increase in temperature, the rate of leaching increases, because the
[A].

diffusivity of solute increases.

[B].

viscosity of solvent decreases.

[C].

thermal conductivity of solute increases.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Mass transfer rate between two fluid phases does not necessarily depend on the __________ of the two phases.
[A].

chemical properties

[B].

physical properties

[C].

degree of turbulence

[D].

interfacial area

Answer: Option A

Explanation:

No answer description available for this question.

Question: As per Gilliland’s equation, the diffusivity is
[A].

directly proportional to ‘T1.5’.

[B].

inversely proportional to ‘P’.

[C].

dependent on the molecular volume & molecular weight of components.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.