Mass Transfer
Blowdown in a cooling tower

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

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Mass Transfer
Flights in a rotary dryer are provided to

None of these
Reduce the residence time of solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Increase the residence time of the solid

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