Mass Transfer
In a counter-current liquid extractor

Liquid's flow rate depends upon the temperature and pressure
Both liquids can have any desired flow rate
Only one of the liquids may be pumped at any desired rate
Both liquids flow at fixed rate

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Mass Transfer
Flights in a rotary dryer are provided to

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
Increase the residence time of the solid

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