Mass Transfer MCQs

Question 1

When adsorption hysteresis is observed, the desorption equilibrium pressure is __________ that obtained by adsorption.

Accepted Answer

Always lower than

Answer

Always higher than

Answer

Same as

Answer

Dependent on the system; can be either lower or higher than

Question 2

Pick out the correct statement.

Accepted Answer

All of the above

Answer

For identical gas flow rates, less pressure drop occurs through a plate tower than through a packed tower

Answer

Plate column can handle greater liquid loads without flooding than packed column, but the liquid hold up is more in the case of plate column

Answer

For the same duty, plate columns weigh less than packed columns

Question 3

__________ developed the film theory.

Accepted Answer

Higbie

Answer

Fick

Answer

Ergun

Answer

Levenspeil

Question 4

On addition of solute in the solvent, the __________ of the solution decreases.

Accepted Answer

Both B and C

Answer

Boiling point

Answer

Freezing point

Answer

Vapour pressure

Question 5

Wet bulb and dry bulb temperatures becomes identical at __________ percent saturation curve.

Accepted Answer

100

Answer

50

Answer

78

Answer

None of these

Question 6

At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Accepted Answer

Is greater than

Answer

Is lower than

Answer

Is same as

Answer

Cannot be predicted as data are insufficient

Question 7

Dry bulb temperature of the gas is __________ the wet bulb temperature.

Accepted Answer

More than

Answer

Less than

Answer

Equal to

Answer

None of these

Question 8

In case of an unsaturated mixture of gas and vapor, the percentage saturation is __________ its relative saturation.

Accepted Answer

Lower than

Answer

Higher than

Answer

Equal to

Answer

Either A or B, depends on the mixture composition

Question 9

Percentage saturation is __________ the relative saturation.

Accepted Answer

Always smaller than

Answer

Always greater than

Answer

Not related to

Answer

None of these