Mass Transfer

Question: Dew point of an air-water vapor mixture
[A].

decreases with decrease in pressure.

[B].

at constant humidity & total pressure is fixed.

[C].

corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option D

Explanation:

No answer description available for this question.

Question: During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.
[A].

wet bulb temperature

[B].

partial pressure of water vapor

[C].

relative humidity

[D].

none of these

Answer: Option A

Explanation:

No answer description available for this question.

Question: Dry bulb temperature of unsaturated air is more than its __________ temperature.
[A].

dew point

[B].

wet bulb

[C].

both ‘a’ & ‘b’

[D].

neither ‘a’ nor ‘b’

Answer: Option C

Explanation:

No answer description available for this question.

Question: Batch tray dryers suffers from the disadvantage of
[A].

high maintenance cost.

[B].

non-uniform & low production rate.

[C].

high labour cost & low heat economy.

[D].

all ‘a’, ‘b’ & ‘c’.

Answer: Option C

Explanation:

No answer description available for this question.

Question: Antibiotics are best handled in a
[A].

Podbielniak extractor.

[B].

sieve tray contractor.

[C].

rotating disc contactor.

[D].

pulsed column extractor.

Answer: Option A

Explanation:

No answer description available for this question.

Question: Dried finished product sampled from various parts of a __________ dryer exhibits non-uniformity in the moisture content.
[A].

rotary

[B].

tray

[C].

freeze

[D].

none of these

Answer: Option B

Explanation:

No answer description available for this question.

Question: Perforated plate towers are unique for solvent extraction because, they provide
[A].

higher contact area.

[B].

better contact of the phase.

[C].

repeated coalescence & redispersion of the drop phase.

[D].

none of these.

Answer: Option C

Explanation:

No answer description available for this question.

Question: In stripping section of continuous distillation column, the
[A].

liquid is stripped of high boiler.

[B].

liquid is enriched with high boiler.

[C].

vapour is stripped of low boiler.

[D].

none of these.

Answer: Option B

Explanation:

No answer description available for this question.

Question: In a gas-liquid absorption coloumn, for obtaining the maximum absorption efficiency
[A].

liquid stream should be distributed uniformly.

[B].

gas stream should be distributed uniformly.

[C].

both gas as well as liquid streams should be distributed uniformly.

[D].

by passing should be completely avoided.

Answer: Option C

Explanation:

No answer description available for this question.

Question: __________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids.
[A].

Watted wall

[B].

Packed

[C].

Plate

[D].

Spray

Answer: Option C

Explanation:

No answer description available for this question.