Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Raising the temperature
Both A & B
Lowering the total pressure
Neither A nor B

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Mass Transfer
Plate efficiency

Increases due to weeping and dumping of liquid
Is a function of the mass transfer between liquid and vapour
Increases due to foaming
Increases due to liquid entrainment

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