Mass Transfer
Flights in a rotary dryer are provided to

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

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the settling rate of the bubbles
Helps in increasing the bubble size entering the settler

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