Mass Transfer
Perforated plate towers are unique for solvent extraction because, they provide

Repeated coalescence & redispersion of the drop phase
Higher contact area
Better contact of the phase
None of these

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Mass Transfer
Flights in a rotary dryer are provided to

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

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