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Mass Transfer

Mass Transfer
Mass transfer co-efficient varies as DAB0.5, according to the __________ theory.

Film
Penetration
Surface renewal
None of these

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Mass Transfer
During dehumidification of unsaturated air wet bulb temperature & partial pressure of vapor are not constant. However, during evaporative cooling process with recirculated water supply, the __________ remains constant.

None of these
Wet bulb temperature
Relative humidity
Partial pressure of water vapor

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Minimise the overall pressure drop
Avoid channeling
Avoid flooding
Reduce liquid hold up

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Mass Transfer
Stacked packing compared to dumped packing

Gives higher pressure drop
Gives lower pressure drop
Both A & B
Provides poorer contact between the fluids

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Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Relative
Percentage
None of these
Molal

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Mass Transfer
The reason for preferring packed towers over plate towers in distillation practice is that the packed tower operation gives

Low pressure drop and high hold up
High pressure drop and high hold up
Low pressure drop and low hold up
High pressure drop and low hold up

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