Mass Transfer - Section 1 (4)

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.

25.

The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

A.	1
B.	0.5
C.	10
D.	0

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

26.

To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

A.	increase both 'G' and 'S'.
B.	decrease both 'G' and 'S'.
C.	increase 'S' and decrease 'G'.
D.	increase 'G' and decrease 'S'

Answer: Option C

Explanation:

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27.

Heat in BTU necessary to increase the temperature of 1 lb of gas and its accompanying vapour by 1°F is called the

A.	latent heat
B.	humid heat
C.	specific heat
D.	sensible heat

Answer: Option C

Explanation:

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28.

Psychrometry deals with the properties of gas-vapor mixture. Humidity can be determined by the measurement of the __________ of a fibre.

A.	electrical resistance
B.	thermal conductivity
C.	strength
D.	none of these.

Answer: Option A

Explanation:

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29.

In batch distillation with constant reflux, overhead product composition __________ with time.

A.	increases
B.	decreases
C.	does not vary
D.	may increase on decrease, depends on the system.

Answer: Option B

Explanation:

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30.

Relative humidity is the ratio of the

A.	partial pressure of the vapour to the vapour pressure of the liquid at room temperature.
B.	partial pressure of the vapour to the vapour pressure of the liquid at gas temperature.
C.	actual humidity to saturation humidity.
D.	none of these

Answer: Option B

Explanation:

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31.

At minimum reflux ratio for a given separation

A.	number of plates is zero.
B.	number of plates is infinity.
C.	minimum number of the theoretical plates is required.
D.	separation is most efficient.

Answer: Option B

Explanation:

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32.

Stefan's law describes the mass transfer by

A.	diffusion
B.	bulk flow
C.	both 'a' & 'b'
D.	neither 'a' nor 'b'

Answer: Option C

Explanation:

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