Mass Transfer - Section 1 (5)

Directions to Solve

Mass Transfer - Section 1

Mass transfer is a field and if you are interested to test your aptitude level
then you can find the MCQs in this section and can solve them easily.

33.

Separation of two or more components of a liquid solution can not be achieved by

A.	fractional crystallisation
B.	liquid extraction
C.	absorption
D.	evaporation

Answer: Option C

Explanation:

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34.

Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a

A.	higher dew point.
B.	higher absolute (specific) humidity.
C.	higher relative humidity
D.	higher wet bulb temperature.

Answer: Option C

Explanation:

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35.

Drying operation under vacuum is carried out to

A.	dry those materials which have very high unbound mositure content.
B.	reduce drying temperature.
C.	increase drying temperature.
D.	dry materials having high bound moisture content.

Answer: Option B

Explanation:

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36.

Which is the controlling factor for a drum drier?

A.	Diffusion
B.	Heat transfer
C.	Both (a) and (b)
D.	Neither (a) nor (b)

Answer: Option B

Explanation:

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37.

On addition of solute in the solvent, the __________ of the solution decreases.

A.	boiling point
B.	freezing point
C.	vapour pressure
D.	both (b) and (c)

Answer: Option D

Explanation:

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38.

Overall efficiency of the distillation column is

A.	the ratio of number of ideal plates to actual plates.
B.	the ratio of number of actual plates to ideal plates.
C.	same as the Murphree efficiency.
D.	always more than the point efficiency.

Answer: Option A

Explanation:

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39.

__________ columns are used for liquid dispersion in a continuous gas phase.

A.	Packed
B.	Pulse
C.	Bubble cap
D.	Sieve plate

Answer: Option A

Explanation:

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40.

Pick out the correct statement.

A.	In case of liquid-liquid extraction, no separation is possible, if the selectivity of the solvent used is unity.
B.	With increase in temperature, the selectivity of the solvent used in solvent extraction decreases.
C.	The selectivity of solvent used in solvent extraction is unity at the plait point.
D.	all (a), (b) and (c).

Answer: Option D

Explanation:

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