Mass Transfer

Question: In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter
[A].

> 4 :1

[B].

< 8 : 1

[C].

> 8:1

[D].

< 6:1

Answer: Option C

Explanation:

No answer description available for this question.

Question: In batch distillation with constant reflux, overhead product composition __________ with time.
[A].

increases

[B].

decreases

[C].

does not vary

[D].

may increase on decrease, depends on the system.

Answer: Option B

Explanation:

No answer description available for this question.

Question: __________ column is used in gas absorption process.
[A].

Wetted wall

[B].

Seive/perforated tray

[C].

Bubble cap

[D].

Packed

Answer: Option D

Explanation:

No answer description available for this question.

Question: During drying of a solid, the critical moisture content increases with
[A].

decreased drying rate

[B].

increased thickness of the solid

[C].

increased drying rate

[D].

both (b) and (c).

Answer: Option D

Explanation:

No answer description available for this question.

Question: In azeotropic mixture, the equilibrium vapour composition is
[A].

more than liquid composition.

[B].

less than liquid composition.

[C].

same as liquid composition.

[D].

independent of pressure.

Answer: Option C

Explanation:

No answer description available for this question.

Question: For __________ drying, the effects of velocity, temperature and humidity of the gas and the thickness of the solid are the same.
[A].

unsaturated surface

[B].

constant rate

[C].

both (a) and (b)

[D].

neither (a) nor (b).

Answer: Option C

Explanation:

No answer description available for this question.

Question: On moving the feed line (q-line) from saturated liquid feed (vertical position) to saturated vapor feed (horizontal feed), if the slope of both the operating lines are to be increased, then it will result in
[A].

greater degree of separation with a fixed number of trays

[B].

increased reboiler load

[C].

increased reflux ratio

[D].

None of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Leaching of coarse solid lumps is also termed as
[A].

decoction

[B].

dissolution

[C].

percolation

[D].

agitation and settling

Answer: Option C

Explanation:

No answer description available for this question.

Question: Which of the following T-H diagram is valid for dehumidification operation ?
[A].

[B].

[C].

[D].

Answer: Option A

Explanation:

No answer description available for this question.

Question: A packed tower compared to a plate tower for a particular mass transfer operation
[A].

incurs smaller pressure drop.

[B].

allows installation of cooling coils.

[C].

is less costly when built in large sizes/diameters.

[D].

is more suitable, if suspended solids are present in fluid streams.

Answer: Option A

Explanation:

No answer description available for this question.