CHEMICAL ENGINEERING

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.

Question: Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.
[A].

molecular

[B].

extractive

[C].

steam

[D].

simple

Answer: Option D

Explanation:

No answer description available for this question.

Question: Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.
[A].

size

[B].

durability

[C].

porosity

[D].

cost

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of constant underflow extraction operation, the __________ at all solute concentration.
[A].

solids are drained to the same extent

[B].

ratio of the insoluble to solution is constant

[C].

both(a) & (b)

[D].

neither (a) nor (b)

Answer: Option C

Explanation:

No answer description available for this question.

Question: Occurrence of ‘case hardening’ during drying of a high moisture solid cake __________ the drying rate.
[A].

increases

[B].

decreases

[C].

does not affect

[D].

exponentially increases

Answer: Option B

Explanation:

No answer description available for this question.