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

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

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
Form a low boiling azeotrope with one of the constituents of the mixture
Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Have high viscosity to provide high tray efficiency

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