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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

1/D
D
D0.5
D2

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Mass Transfer
During the constant rate period of drying of a solid,

Increasing the air temperature decreases the drying rate
Surface evaporation of unbound moisture occurs
Increased air humidity decreases the rate of drying
None of these

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Mass Transfer
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Cannot be predicted as data are insufficient
Is same as
Is lower than
Is greater than

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Less number of trays
Low reflux ratio
Small cross-section column
High reflux ratio

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Mass Transfer
For ethanol-water system, the lowering of distillate quality from 95% to 92% will cause __________ plate requirement.

No change in theoretical
Major decrease in the number of
Marginal decrease in the number of
None of the listed here

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Mass Transfer
At constant pressure, with increase of temperature, the dew point will

Increase/decrease ; depends on the temperature
Remain unchanged
Increase
Decrease

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