Mass Transfer
In a counter-current liquid extractor

Both liquids flow at fixed rate
Only one of the liquids may be pumped at any desired rate
Both liquids can have any desired flow rate
Liquid's flow rate depends upon the temperature and pressure

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

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

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