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
Cold water leaving the tower and the wet bulb temperature of the surrounding air
None of these

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Total cost first decreases and then increases
Liquid flow increases while the vapor flow decreases for a system
Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases

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