Mass Transfer
Mass transfer co-efficient is directly proportional to DAB0.5, according to __________ theory.

Film
Penetration
Surface renewal
None of these

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Mass Transfer
Flights in a rotary dryer are provided to

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

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