Chemical Engineering - Mass Transfer

1. 

The McCabe Δ L law states that the

A. molar heats of vaporisation of components are nearly equal.
B. linear crystal growth rate depends on the degree of supersaturation.
C. linear crystal growth rate does not depend on the crystal size.
D. linear crystal growth rate depends on the crystal size.

Answer: Option C

Explanation:

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2. 

Bollman extractor

A. is a static bed leaching equipment.
B. is used for extraction of oil from oilseed.
C. is a centrifugal extractor.
D. employs only counter-current extraction.

Answer: Option B

Explanation:

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3. 

The relation, Sc = Pr = 1, is valid, when the mechanism of __________ ansfer is same.

A. heat and mass
B. mass and momentum
C. heat and momentum
D. heat, momentum and mass

Answer: Option A

Explanation:

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4. 

A coalescer in a mixer-settler liquid-liquid extraction coloumn

A. comprises of thin bed of substances of extended surface having high porosity.
B. helps in increasing the bubble size entering the settler.
C. helps in increasing the settling rate of the bubbles.
D. all 'a', 'b', & 'c'.

Answer: Option D

Explanation:

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5. 

For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

A. increase
B. decrease
C. remain same
D. data insufficient, can't be predicted

Answer: Option A

Explanation:

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