MASS TRANSFER QUIZ

Rayleigh's equation applies to __________ distillation.

Flash

Differential

Steam

Continuous

TRUE ANSWER : ?
YOUR ANSWER : ?

Weeping in a distillation column

Results due to very high gas velocity

Provides large interfacial surface for mass transfer

Increases tray efficiency

Results due to very low gas velocity

TRUE ANSWER : ?
YOUR ANSWER : ?

The commonly used solvent in supercritical extraction is

Water

Carbon tetrachloride

Methyl ethyl ketone

Carbon dioxide

TRUE ANSWER : ?
YOUR ANSWER : ?

For which of the following unit operations, Lewis number is of significance?

Adsorption

Gas absorption

Humidification

Binary distillation

TRUE ANSWER : ?
YOUR ANSWER : ?

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

D0.5

1/D

D2

D

TRUE ANSWER : ?
YOUR ANSWER : ?

The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

Dependent on the Reynolds number

D/2a

Proportional to √D

D/a

TRUE ANSWER : ?
YOUR ANSWER : ?

In distillation, overhead product contains

Only saturated liquid

Only one component

Any number of components

Two components

TRUE ANSWER : ?
YOUR ANSWER : ?

Heat load in a cooling tower

Neither A nor B

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

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

Both A & B

TRUE ANSWER : ?
YOUR ANSWER : ?

Total reflux in a distillation operation requires minimum

All of these

Reboiler load

Number of plates

Condenser load

TRUE ANSWER : ?
YOUR ANSWER : ?

A coalescer in a mixer-settler liquid-liquid extraction coloumn

Helps in increasing the settling rate of the bubbles

All of these

Helps in increasing the bubble size entering the settler

Comprises of thin bed of substances of extended surface having high porosity

TRUE ANSWER : ?
YOUR ANSWER : ?