Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Decreases
And the heat required in reboiler decreases
Increases
Remains unaffected

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Mass Transfer
Flights in a rotary dryer are provided to

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

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