Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Neither A nor B
Range is 15°F
Both A & B
Approach is 10°F

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Mass Transfer
Blowdown in a cooling tower

All of these
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities
Increases the scale forming tendencies of water
Is undesirable

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