Mass Transfer
Use of packed towers for distillation is generally limited to the

Small sizes
Vacuum distillation
High pressure operation
Multicomponent distillation

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Mass Transfer
Flights in a rotary dryer are provided to

Increase the residence time of the solid
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Reduce the residence time of solid
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

Hot water entering and the cooled water leaving the cooling tower
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
None of these

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