Mass Transfer

Question: Mass transfer co-efficient is defined as
[A].

Flux = Co-efficient/concentration difference.

[B].

Co-efficient = Flux/concentration difference.

[C].

Flux=concentration difference/co-effi-cient.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Molecular diffusion is caused by the
[A].

transfer of molecules from low concentration to high concentration region.

[B].

thermal energy of the molecules.

[C].

activation energy of the molecules.

[D].

potential energy of the molecules.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,
[A].

inversely

[B].

linearly

[C].

exponentially

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: For the flow of gases through a capillary, with increase in temperature, the permeability __________ as per Knudsen law.
[A].

increases

[B].

decreases

[C].

remains same

[D].

either (a) or (b); depends on the gas

Answer: Option A

Explanation:

No answer description available for this question.

Question: (NRe . NSc) is termed in mass transfer operation as the __________ number.
[A].

Stanton

[B].

Sherwood

[C].

Peclet

[D].

none of these

Answer: Option C

Explanation:

No answer description available for this question.

Question: In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.
[A].

lower than

[B].

higher than

[C].

equal to

[D].

either (a) or (b), depends on the mixture composition

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.
[A].

increases

[B].

decreases

[C].

remains same

[D].

increases linearly

Answer: Option A

Explanation:

No answer description available for this question.

Question: With increase in temperature, the solubility of gases in liquids, at fixed pressure
[A].

increases

[B].

decreases

[C].

remains same

[D].

either (a) or (b), depends on the system

Answer: Option B

Explanation:

No answer description available for this question.

Question: With increase in pressure, the relative volatility for a binary system
[A].

increases.

[B].

decreases.

[C].

remains same.

[D].

either (a) or (b), depends on the system.

Answer: Option B

Explanation:

No answer description available for this question.

Question: (NSh/NRe.NSc) is termed in mass transfer operation as the
[A].

Stanton number

[B].

Peclet number

[C].

thermal diffusivity

[D].

momentum diffusivity

Answer: Option A

Explanation:

No answer description available for this question.