Mass Transfer MCQs

Total

Minimum

Operating

Maximum permissible

Dry bulb

Wet bulb

Dew point

None of these

Liquid

Gas

Both A & B

Neither A nor B

< 1 and ≈ 1

1 and 0

>1 and ≈ 1

0 and ≈ 1

Is a function of the mass transfer between liquid and vapour

Increases due to foaming

Increases due to liquid entrainment

Increases due to weeping and dumping of liquid

D ∝ P0.5

D ∝ 1/P0.5

D ∝ 1/P

D ∝ 1/P1.5

25%

50%

70%

90%

Gas side co-efficient should be increased

Liquid side coefficient should be increased

Gas side co-efficient should be decreased

Liquid side co-efficient should be decreased

Gas film

Liquid film

Liquid-gas interface

None of these

Unidirectional diffusion from liquid to gas phase

Unidirectional diffusion from gas to liquid phase

Either A or B

A counter diffusion at an almost equal molar rate