Mass Transfer MCQs

Question 1

Ordinary diffusion process is also called __________ diffusion.

Accepted Answer

Concentration

Answer

Pressure

Answer

Thermal

Answer

Forced

Question 2

Leaching of coffee from coffee beans is done by

Accepted Answer

Hot water

Answer

Hexane

Answer

Lime water

Answer

Dilute H 2 SO 4 (hot)

Question 3

The value of L/mG ratio for economical absorption operation ranges from

Accepted Answer

1.25 to 2.0

Answer

0.5 to 0.8

Answer

0.8 to 1.2

Answer

2.5 to 3.5

Question 4

The diffusivity (D) in a binary gas mixture is related to the temperature (T) as

Accepted Answer

D ∝ T 1.5

Answer

D ∝ T

Answer

D ∝ T 0.5

Answer

D ∝ T 2

Question 5

H 2 S present in naphtha reformed gas is removed by absorbing with

Accepted Answer

Ethanolamine

Answer

K 2 CO 3

Answer

HCl

Answer

Vacuum gas oil

Question 6

The caking of crystals can be prevented by

Accepted Answer

Both A and C

Answer

Maintaining high critical humidity

Answer

Maintaining low critical humidity

Answer

Coating the product with inert material

Question 7

The slope of 9-line is determined by the

Accepted Answer

Thermal condition of the feed

Answer

Reflux ratio

Answer

Plate efficiency to be achieved

Answer

Relative volatility

Question 8

A solid material shows case hardening properties while drying. Which of the following should be controlled to control the drying process?

Accepted Answer

Temperature of the solid

Answer

Flow rate of inlet air

Answer

Relative humidity of outlet air

Answer

Humidity of inlet air

Question 9

Langmuir equation is associated with

Accepted Answer

Adsorption

Answer

Leaching

Answer

Steam distillation

Answer

Multicomponent absorption