Mass Transfer
Blowdown in a cooling tower

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

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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
Dew point of an air-water vapor mixture

Decreases with decrease in pressure
Corresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve
At constant humidity & total pressure is fixed
All of the listed here

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