Mass Transfer MCQs

Question 1

The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Accepted Answer

Temperature rises

Answer

Pressure rises

Answer

Temperature falls

Answer

Pressure falls

Question 2

In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be

Accepted Answer

Gas phase resistance controlled

Answer

Liquid phase resistance-controlled

Answer

Impossible

Answer

Driven by a non-linear driving force

Question 3

Which of the following is not a batch drier?

Accepted Answer

Fluidised bed drier

Answer

Truck drier

Answer

Agitated pan drier

Answer

Vacuum shelf drier

Question 4

Molecular diffusivity of a liquid

Accepted Answer

Increases with temperature

Answer

Decreases with temperature

Answer

May increase or decrease with temperature

Answer

Is independent of temperature

Question 5

During sensible cooling process

Accepted Answer

Both B and C

Answer

Relative humidity decreases

Answer

Relative humidity increases

Answer

Wet bulb temperature decreases

Question 6

In McCabe-Thiele method, at infinite reflux ratio

Accepted Answer

The overhead product is minimum

Answer

Both the operating lines coincide with diagonal

Answer

Both A & B

Answer

Neither A nor B

Question 7

The dew point of a saturated gas phase equals the __________ temperature.

Accepted Answer

Gas

Answer

Room

Answer

Wet bulb

Answer

None of these

Question 8

Absorption (liquid-gas system) with evolution of heat as compared to isothermal absorption results in

Accepted Answer

All of the above

Answer

Decreased solute solubility

Answer

Large minimum liquid to gas (L/G) ratio

Answer

Large number of trays

Question 9

Stage efficiency in a leaching process depends on the

Accepted Answer

Both A & B

Answer

Time of contact between the solid and the solution

Answer

Rate of diffusion of the solute through the solid and into the liquid

Answer

Vapour pressure of the solution