Mass Transfer
Flights in a rotary dryer are provided to

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

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

None of the listed here
Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the cooled water leaving the tower
Hot water entering the tower and the wet bulb temperature of the surrounding air

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