Mass Transfer
Batch tray dryers suffers from the disadvantage of

All of the listed here
Non-uniform & low production rate
High labour cost & low heat economy
High maintenance cost

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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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