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
Increase the residence time of the solid
None of these

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Mass Transfer
Flash distillation is

Same as differential distillation
Most useful for handling binary systems
Same as simple distillation
Used for multicomponent systems like crude refining

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