Mass Transfer

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.

Question: __________ extractor uses centrifugal force for separating the two phases.
[A].

Treybal

[B].

Schiebel

[C].

Podbielniak

[D].

None of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: If the amount of the steam used in steam distillation is increased, the temperature of distillation
[A].

increases

[B].

decreases

[C].

remains unchanged

[D].

depends on relative volatility

Answer: Option B

Explanation:

No answer description available for this question.

Question: Dorr thickener is an equipment used for
[A].

classification

[B].

sedimentation

[C].

clarification

[D].

leaching

Answer: Option B

Explanation:

No answer description available for this question.

Question: The boiling points of pure components of a binary system __________ with increase in total pressure of the system.
[A].

decreases

[B].

increases

[C].

remains unchanged

[D].

may increase or decrease, depends on the system.

Answer: Option B

Explanation:

No answer description available for this question.

Question: JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by
[A].

Nsh = 2

[B].

Nst = 2

[C].

Nsc = 2

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Laboratory determination of the dif-fusivity of vapor is done by __________ method.
[A].

wetted wall column

[B].

Gilliland’s

[C].

Winkel mann’s

[D].

Wike’s

Answer: Option C

Explanation:

No answer description available for this question.