Mass Transfer
Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the __________ number.

Sherwood
Stanton
Schmidt
Peclet

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Mass Transfer
Dew point of an air-water vapor mixture

Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
All of the listed here
At constant humidity & total pressure is fixed
Decreases with decrease in pressure

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly

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Mass Transfer
Channelling is most severe

In towers packed randomly with crushed solids
In dumped packing of regular units
At very high liquid flow rate
In towers packed with stacked packing

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