Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Feed composition
Allowable gas velocity
Allowable liquid velocity
Allowable gas and liquid velocities

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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
None of these
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas

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