Mass Transfer
In distillation where q is defined as the moles of liquid flow in the stripping section per mole of feed introduced, for saturated liquid feed

q = 0
q < 1
q > 1
q = 1

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only liquid phase obeys Dalton's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Only vapor phase follows Raoult's law

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Mass Transfer
Plate efficiency

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

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