Chemical Engineering - Mass Transfer

1. 

When both the fluids flow concurrently in an absorber, the slope of the operating line is

A. - ve
B. + ve
C. 1
D. -1

Answer: Option A

Explanation:

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2. 

The percentage humidity is less than the relative humidity only at __________ percent humidity.

A. zero
B. hundred
C. both zero and hundred
D. none of these

Answer: Option C

Explanation:

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3. 

Back-trapping in a distillation column

A. increases tray efficiency.
B. decreases tray efficiency.
C. reduces pressure drop.
D. is desirable, as it provides improved vapour-liquid contact.

Answer: Option B

Explanation:

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4. 

Flooding in a vapor-liquid contacting equipment occurs in a tray, when the pressure drop through a tray is __________ the liquid head available in the downcomer.

A. less than
B. more than
C. same as
D. very much less

Answer: Option B

Explanation:

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5. 

Milk is dried usually in a __________ dryer.

A. freeze
B. spray
C. tray
D. rotary

Answer: Option B

Explanation:

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