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Mass Transfer

Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

1
< 1
> 1

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Mass Transfer
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Temperature
Total pressure
All of these
Composition

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Mass Transfer
Drying operation under vacuum is carried out to

Increase drying temperature
Reduce drying temperature
Dry those materials which have very high unbound mositure content
Dry materials having high bound moisture content

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Mass Transfer
Selectivity of the solvent used in solvent extraction should be

> 1
1
< 1

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

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

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Mass Transfer
In a moderately sized packed absorption tower, channeling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter

< 6:1
> 8:1
> 4 :1
< 8 : 1

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