Mass Transfer MCQs

Question 1

Which of the following equipments is not used in liquid-liquid extraction?

Accepted Answer

Pachuka tank

Answer

Agitated vessels

Answer

Centrifugal extractors

Answer

Packed towers

Question 2

With increase in temperature, the solubility of gases in liquids, at fixed pressure

Accepted Answer

Decreases

Answer

Increases

Answer

Remains same

Answer

Either A or B, depends on the system

Question 3

Dryer widely used in a textile industry is __________ dryer.

Accepted Answer

Conveyor

Answer

Festoon

Answer

Cylinder

Answer

Tunnel

Question 4

Drying of a solid involves __________ transfer.

Accepted Answer

Both heat and mass

Answer

Only heat

Answer

Only mass

Answer

None of these

Question 5

Laboratory determination of the dif-fusivity of vapor is done by __________ method.

Accepted Answer

Wetted wall column

Answer

Gilliland's

Answer

Winkel mann's

Answer

Wike's

Question 6

'Absorption with chemical reaction' is involved in the removal of

Accepted Answer

Carbon dioxide from gaseous stream using alkaline solution

Answer

Benzol from coke oven gas using solar oil/wash oil

Answer

Ammonia from coke oven gas using refrigerated water

Answer

Tar from coke oven gas in primary gas coolers using chilled water

Question 7

Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Accepted Answer

Porosity

Answer

Size

Answer

Durability

Answer

Cost

Question 8

Which of the following employs an accessory known as 'drift eliminator' ?

Accepted Answer

Mechanical draft cooling tower

Answer

Multiple effect evaporator

Answer

Rotary dryer

Answer

Rotating disc contactor

Question 9

If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)

Accepted Answer

$$ - \frac{1}{{	ext{f}}}$$

Answer

$$\frac{{1 - {	ext{f}}}}{{	ext{f}}}$$

Answer

$$ - \frac{{{	ext{f}} - 1}}{{	ext{f}}}$$

Answer

$$ - \frac{{	ext{f}}}{{1 - {	ext{f}}}}$$