Mass Transfer MCQs

Question 1

Raoult's law is applicable to the

Accepted Answer

Ideal solutions

Answer

Real solutions

Answer

Mixture of water and alcohol

Answer

Non-ideal gases

Question 2

Molecular seives are regenerated by heating to __________ °C.

Accepted Answer

200-330

Answer

< 150

Answer

> 500

Answer

> 1000

Question 3

The most common packing used in industrial operations is __________ rings.

Accepted Answer

Raschig

Answer

Lessing

Answer

Cross-partition

Answer

Single spiral

Question 4

For the same feed, feed quality and separation (in a distillation column), with the increase of total pressure, the number of ideal plates will

Accepted Answer

Increase

Answer

Decrease

Answer

Remain same

Answer

Data insufficient, can't be predicted

Question 5

For an absorber, both equilibrium and operating line will be straight for

Accepted Answer

Dilute solution and isothermal operation

Answer

Concentrated solution and non-isothermal operation

Answer

Dilute solution and non-isothermal operation

Answer

Concentrated solution and isothermal operation

Question 6

Heat load in a cooling tower

Accepted Answer

Both A & B

Answer

Means the amount of heat thrown away (KCal/hr.) by the cooling tower

Answer

Is equal to the number of kg, of water circulated times the cooling range

Answer

Neither A nor B

Question 7

A minimum boiling azeotrope is exemplified by

Accepted Answer

Acetone-carbon disulphide

Answer

Toluene-benzene

Answer

Water-isobutyl alcohol

Answer

None of these

Question 8

In case of absorption & stripping, the interface of the liquid & gas phases are present in equilibrium, when the diffusional resistance of __________ is zero.

Accepted Answer

Interface

Answer

Gas phase

Answer

Liquid phase

Answer

All of the above

Question 9

In most of the vacuum crystalliser, vacuum is generally produced by means of a

Accepted Answer

Steam jet ejector with a barometric condenser

Answer

Suction pump

Answer

Compressed air jet

Answer

None of these