Chemical Engineering - Mass Transfer

1. 

Solvent extraction is the terminology applied to the liquid-liquid extraction, which is preferred for the separation of the components of liquids, when

A. extracting solvent is cheaply & abundantly available.
B. one of the liquid components is heat sensitive.
C. viscosity of liquid components is very high.
D. one of the liquid components has very high affinity towards the solvent.

Answer: Option D

Explanation:

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2. 

Inside the distillation column, the

A. driving force for the vapour flow is the pressure drop.
B. liquids are not always at their bubble points.
C. pressure increases gradually from bottom to the top of the column.
D. none of these

Answer: Option A

Explanation:

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3. 

Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in

A. viscosity with concentration.
B. degree of ideality of the solution.
C. both (a) and (b).
D. neither (a) nor (b).

Answer: Option C

Explanation:

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4. 

Occurrence of 'case hardening' during drying of a high moisture solid cake __________ the drying rate.

A. increases
B. decreases
C. does not affect
D. exponentially increases

Answer: Option B

Explanation:

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5. 

Which of the following is not a continuous drier ?

A. Drum drier
B. Spray drier
C. Tunnel drier
D. Tray drier

Answer: Option D

Explanation:

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