Mass Transfer
Flights in a rotary dryer are provided to

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

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Mass Transfer
In saturated gas, the

Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature
Vapour is in equilibrium with the liquid at the gas temperature
None of the listed here

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