Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Minimise the overall pressure drop
Reduce liquid hold up
Avoid channeling
Avoid flooding

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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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