Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Both operating and equilibrium lines are parallel
Operating line lies above the equilibrium line
Operating line lies below the equilibrium line
Pressure drop in the column is very high

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Mass Transfer
Heat load in a cooling tower

Is equal to the number of kg, of water circulated times the cooling range
Both A & B
Neither A nor B
Means the amount of heat thrown away (KCal/hr.) by the cooling tower

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the partial pressure of A
Partial pressure of component A to the total pressure
Vapour pressure of component A to the total pressure
Vapour pressure of component A to that of component B

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