Mass Transfer

Question: Channelling is most severe
[A].

in towers packed with stacked packing.

[B].

in towers packed randomly with crushed solids.

[C].

in dumped packing of regular units.

[D].

at very high liquid flow rate.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Lewis number (Le) is
[A].

Sc x Pr

[B].

Pr x St

[C].

Sh x Pr

[D].

St x Sh

Answer: Option A

Explanation:

No answer description available for this question.

Question: For contacting a highly soluble gas with a liquid
[A].

bubble the gas through liquid.

[B].

spray the liquid on gas stream.

[C].

either (a) or (b) would suffice.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: For absorbing a sparingly soluble gas in a liquid, the
[A].

gas side co-efficient should be increased.

[B].

liquid side coefficient should be increased.

[C].

gas side co-efficient should be decreased.

[D].

liquid side co-efficient should be decreased.

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mass transfer co-efficient of liquid is
[A].

affected more by temperature than that for gases.

[B].

affected much less by temperature than that for gases.

[C].

not affected by the temperature.

[D].

none of these.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the __________ number.
[A].

Sherwood

[B].

Schmidt

[C].

Peclet

[D].

Stanton

Answer: Option A

Explanation:

No answer description available for this question.

Question: In physical terms, Schmidt number means
[A].

thermal diffusivity/mass diffusivity.

[B].

thermal diffusivity/momentum diffusivity.

[C].

momentum diffusivity/mass diffusivity.

[D].

mass diffusivity/thermal diffusivity.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.
[A].

Schmidt

[B].

Sherwood

[C].

Peclet

[D].

Stanton

Answer: Option A

Explanation:

No answer description available for this question.

Question: Penetration theory relates the average mass transfer co-efficient (K) with diffusivity (D) as
[A].

K ∝D

[B].

K ∝D

[C].

K ∝D1.5

[D].

K ∝D2

Answer: Option B

Explanation:

No answer description available for this question.

Question: Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as
[A].

K ∝ D

[B].

K ∝D

[C].

K ∝ D1.5

[D].

K ∝ D2

Answer: Option A

Explanation:

No answer description available for this question.