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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

150
0.7
7
70

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Mass Transfer
__________ developed the film theory.

Higbie
Fick
Ergun
Levenspeil

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Mass Transfer
During constant rate drying period, vaporisation rate per unit drying surface area

Does not affect the moisture content of the wet solid
Decreases with time
Increases with time
Does not change with time

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Mass Transfer
Extraction of coffee from its seed is done by

Steam distillation
Leaching
Liquid-liquid extraction
Extractive distillation

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Mass Transfer
If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are

Both A & B
Neither A nor B
Parallel
Straight

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Mass Transfer
Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.

Molecular
Steam
Simple
Extractive

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