Mass Transfer - Section 1 (3)

Directions to Solve

Mass Transfer - Section 1

Mass transfer is a field and if you are interested to test your aptitude level
then you can find the MCQs in this section and can solve them easily.

17.

Which of the following remains constant during sensible cooling process ?

A.	Specific humidity
B.	Partial pressure of vapour
C.	Both (a) and (b)
D.	Neither (a) nor (b)

Answer: Option C

Explanation:

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18.

A plait point is the point on the solubility curve, where the tie line reduces to a point. What is the number of plait point for a ternery system containing twopairs of partially miscible liquids ?

A.	0
B.	1
C.	2
D.	3

Answer: Option A

Explanation:

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19.

Absorption factor is defined as (where, S1 = slope of the operating line S2 = slope of the equilibrium curve)

A.	S2/S1
B.	S1/S2
C.	S1 - S2
D.	S1 x S2

Answer: Option B

Explanation:

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20.

As the reflux ratio in a distillation coloumn is increased from the minimum, the

A.	slope of the operating line in stripping section decreases.
B.	number of plates decreases very slowly first and then more and more rapidly.
C.	total cost first decreases and then increases.
D.	liquid flow increases while the vapor flow decreases for a system.

Answer: Option C

Explanation:

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21.

In case of an absorber, the operating

A.	line always lies above the equilibrium curve.
B.	line always lies below the equilibrium curve.
C.	line can be either above or below the equilibrium curve.
D.	velocity is more than the loading velocity.

Answer: Option A

Explanation:

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22.

Which of the following plays an important role in problems of simultaneous heat and mass transfer ?

A.	Lewis number
B.	Schmidt number
C.	Prandtl number
D.	Sherwood number

Answer: Option A

Explanation:

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23.

In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

A.	increases with increase in
B.	is one at unity value of
C.	both (a) and (b)
D.	neither (a) nor (b)

Answer: Option C

Explanation:

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24.

Dew point of a gas-vapour mixture

A.	increases with temperature rise.
B.	decreases with temperature rise.
C.	decreases with decrease in pressure.
D.	increases with increase in pressure.

Answer: Option C

Explanation:

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