Mass Transfer MCQs

Question 1

Diameter of raschig rings used in packed tower in industry is normally around __________ inches.

Accepted Answer

2

Answer

8

Answer

12

Answer

18

Question 2

An example of elutioh is

Accepted Answer

Separation of uranium oxide from its ore by H2SO4 in a Pachuca tank

Answer

Separation of sugar from sugar beet by hot water

Answer

Dissolution of tannin out of tree barks by water

Answer

Recovery of vegetable oils from seeds

Question 3

Pick out the correct statement.

Accepted Answer

The driving force for mass transfer in a wet solid is its free moisture content

Answer

Bound moisture is removed during constant rate drying period

Answer

Free moisture is removed during falling rate drying period

Answer

The sum of free moisture and equilibrium moisture in a solid is called the critical moisture

Question 4

Dry bulb temperature of unsaturated air is more than its __________ temperature.

Accepted Answer

Both A & B

Answer

Dew point

Answer

Wet bulb

Answer

Neither A nor B

Question 5

In a packed bed absorption column, the channelling will be noted by the

Accepted Answer

Sharp drop in pressure drop

Answer

Increase in flow rate

Answer

Sharp rise in pressure drop

Answer

None of these

Question 6

Condensation of a vapour-gas mixture just begins, when (where, p = partial pressure of the vapour, P = vapour pressure of the liquid)

Accepted Answer

p = P

Answer

p >> P

Answer

p < P

Answer

p << P

Question 7

Relative volatility does not change appreciably with the change in

Accepted Answer

Temperature

Answer

Vapour pressure of either component

Answer

Total pressure

Answer

None of these

Question 8

Leaching of sugar from sugar beets is done by

Accepted Answer

Hot water

Answer

Hexane

Answer

Dilute H2SO4

Answer

Lime water

Question 9

In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)

Accepted Answer

Decreases

Answer

Increases

Answer

Remains unchanged

Answer

None of these