Chemical Engineering - Mass Transfer

26. 

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:

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27. 

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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28. 

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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29. 

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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30. 

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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