Chemical Engineering - Mass Transfer

31. 

The binary diffusivity in gases at atmospheric conditions is about

A. 10-9 cm/sec
B. 10-1 cm2/sec
C. 10-3 sec/cm
D. 10-4 cm2/sec2

Answer: Option B

Explanation:

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32. 

Percentage saturation is __________ the relative saturation.

A. always smaller than
B. always greater than
C. not related to
D. none of these

Answer: Option A

Explanation:

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33. 

In case of a desorber (stripper), the

A. operating line always lies above the equilibrium curve.
B. operating line always lies below the equilibrium curve.
C. temperature remains unaffected.
D. temperature always increases.

Answer: Option B

Explanation:

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34. 

What is the reflux ratio at total reflux ?

A. Zero
B. Infinity
C. Unity
D. Data insufficient

Answer: Option B

Explanation:

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35. 

Under conditions of flooding in packed tower, the gas pressure drop

A. decreases rapidly
B. increases rapidly
C. remains constant
D. is maximum

Answer: Option D

Explanation:

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