Chemical Engineering - Mass Transfer

1. 

Unsaturated air (with dry and wet bulb temperatures being 35 and 25°C respectively) is passed through water spray chamber maintained at 35°C. The air will be

A. cooled
B. humidified
C. both (a) & (b)
D. dehumidified

Answer: Option B

Explanation:

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2. 

For absorbing a sparingly soluble gas in a liquid, the

A. gas side co-efficient should be increased.
B. liquid side coefficient should be increased.
C. gas side co-efficient should be decreased.
D. liquid side co-efficient should be decreased.

Answer: Option B

Explanation:

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3. 

A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

A. 10-15
B. 30-40
C. 70-80
D. 90-100

Answer: Option A

Explanation:

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4. 

The boiling points of pure components of a binary system __________ with increase in total pressure of the system.

A. decreases
B. increases
C. remains unchanged
D. may increase or decrease, depends on the system.

Answer: Option B

Explanation:

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5. 

The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the

A. differential heat of adsorption.
B. heat of wetting.
C. integral heat of adsorption.
D. none of these.

Answer: Option A

Explanation:

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