Mass Transfer
Relative humidity is the ratio of the

Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature

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Mass Transfer
Plate efficiency

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

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Mass Transfer
For a ternery mixture, in which equilateral triangular co-ordinate is used in leaching and extraction, a __________ of the equilateral triangular co-ordinates.

Binary mixture is represented by the apex
Ternery mixture is represented by the sides
Pure component is represented by the apex
Binary mixture is represented by any point inside

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Mass Transfer
For water-ethanol system, the minimum reflux ratio

Cannot be computed
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Is the optimum reflux ratio
Is computed from the intercept of the operating line

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