Mass Transfer
Mass transfer co-efficient is directly proportional to DAB according to the __________ theory.

Surface-renewal
Film
Penetration
None of these

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

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 and the cooled water leaving the cooling tower
None of these

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