Chemical Engineering - Mass Transfer

6. 

At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.

A. operating
B. total
C. minimum
D. maximum permissible

Answer: Option B

Explanation:

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7. 

Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

A. viscosity
B. density
C. solubility
D. relative volatility

Answer: Option C

Explanation:

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8. 

Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.

A. molecular
B. extractive
C. steam
D. simple

Answer: Option D

Explanation:

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9. 

Which of the following equipments is not used in liquid-liquid extraction ?

A. Pachuka tank
B. Agitated vessels
C. Centrifugal extractors
D. Packed towers

Answer: Option A

Explanation:

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10. 

Pick out the wrong statement.

A. Packed towers are preferred for vacuum operation, because the pressure drop through the packing is less and they (packings) also lessen the possibility of tower wall collapse.
B. Packed towers are preferred over plate towers for handling corrosive and foamy liquids.
C. Diameter of randomly packed tower is normally more than 1.2 metres.
D. Due to uneven supply and improper distribution of liquid, problem of channeling, loading & flooding is generally encountered in packed towers.

Answer: Option C

Explanation:

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