Mass Transfer MCQs

Question 1

Pick out the wrong statement.

Accepted Answer

The capacity of a distillation coloumn is maximum at total reflux

Answer

In solvent extraction, the distribution co-efficient should be as large as possible for solvent economy

Answer

With increase in pressure, the solubility of gases in solvent increases at a fixed temperature

Answer

Decrease in Murphree plate efficiency is an indication of entrainment in distillation coloumn

Question 2

Raschig ring made of procelain cannot be used for treating concentrated

Accepted Answer

Alkalis

Answer

Hydrochloric acid

Answer

Nitric acid

Answer

Sulphuric acid

Question 3

The-relative volatility for separation of a non-ideal binary mixture by distillation should be

Accepted Answer

> 1

Answer

0

Answer

1

Answer

< 1

Question 4

According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

Accepted Answer

D

Answer

D 2

Answer

D 0.5

Answer

$$\frac{1}{{	ext{D}}}$$

Question 5

In Mcabe-Thiele method, at infinite reflux ratio

Accepted Answer

Both the operating lines coincide with the diagram

Answer

Number of plates is maximum

Answer

Overhead product is maximum

Answer

None of these

Question 6

What is the reflux ratio at total reflux?

Accepted Answer

Infinity

Answer

Zero

Answer

Unity

Answer

Data insufficient

Question 7

__________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower.

Accepted Answer

Lewis

Answer

Sherwood

Answer

Stanton

Answer

Peclet

Question 8

Plate efficiency

Accepted Answer

Is a function of the mass transfer between liquid and vapour

Answer

Increases due to foaming

Answer

Increases due to liquid entrainment

Answer

Increases due to weeping and dumping of liquid

Question 9

The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Accepted Answer

Temperature

Answer

Composition

Answer

Total pressure

Answer

All of the above