Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Decreases
Remains unchanged
Increases
Depends on the pressure of the system

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Mass Transfer
Flights in a rotary dryer are provided to

None of these
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

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