Quiz about Mass Transfer

Question 1

According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B ? Assume that relative volatility (αAB = 2) does not change appreciably in the column.

Accepted Answer

12

Answer

5

Answer

9

Answer

28

Question 2

With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________, if the conduction and radiation through the solid are negligible.

Accepted Answer

Increases

Answer

Decreases

Answer

Remain same

Answer

Increases linearly

Question 3

During the constant rate period of drying of a solid,

Accepted Answer

Surface evaporation of unbound moisture occurs

Answer

Increased air humidity decreases the rate of drying

Answer

Increasing the air temperature decreases the drying rate

Answer

None of these

Question 4

Large scale drying of wheat is done in a __________ dryer.

Accepted Answer

Spouted bed

Answer

Fluidised bed

Answer

Tray

Answer

Vacuum rotary

Question 5

Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is

Accepted Answer

Insoluble in the liquid

Answer

Soluble in the liquid

Answer

Non-ideal in nature

Answer

At a fixed temperature

Question 6

With increase in temperature, the leaching rate increases due to

Accepted Answer

Both (A) and (B)

Answer

Decreased liquid viscosity

Answer

Increased diffusivity

Answer

Neither (A) nor (B)

Question 7

As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

Accepted Answer

Decrease

Answer

Increase

Answer

Remain unchanged

Answer

Can either increase or decrease, depends on the system

Question 8

In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

Accepted Answer

q = 1

Answer

q > 1

Answer

q < 1

Answer

q = 0

Question 9

Large scale drying of sugar is done in a __________ dryer.

Accepted Answer

Rotary

Answer

Spouted bed

Answer

Tray

Answer

Truck

Question 10

Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysteresis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Accepted Answer

Lower than

Answer

Higher than

Answer

Same as

Answer

Either same or higher than

Practice Test On:
Mass Transfer

Mass Transfer Important MCQs

Practice Test On: Mass Transfer

Mass Transfer Important MCQs

Practice Test On:
Mass Transfer