Mass Transfer
Fenske's equation for determining the minimum number of theoretical stages in distillation column holds good, when the

Multicomponent distillation is involved
Mixture (to be separated) shows positive deviation from ideality
Relative volatility is reasonably constant
Mixture (to be separated) shows negative deviation from ideality

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Mass Transfer
Inside the distillation column, the

None of these
Driving force for the vapour flow is the pressure drop
Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column

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Mass Transfer
The term "cooling range" in a cooling tower refers to the difference in the temperature of

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the cooled water leaving the tower
None of the listed here

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