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Mass Transfer

Mass Transfer
Gaseous diffusivity at atmospheric pressure is of the order of __________ cm²/second.

1
> 10
5 to 10
1 to 5

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Never
Yes ; if the reflux ratio is maximum
Yes
Normally not; but is possible if infinite number of plates are put

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Mass Transfer
With increase in absolute humidity, the dew point of an unsaturated mixture of air and water vapor (at constant pressure and temperature)

Remains unchanged
Increases
Decreases
Decreases linearly

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Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Film
Penetration
None of these
Surface renewal

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Mass Transfer
__________ developed the film theory.

Higbie
Ergun
Levenspeil
Fick

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Mass Transfer
Ordinary diffusion process is also called __________ diffusion.

Concentration
Pressure
Forced
Thermal

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