Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Both operating and equilibrium lines are parallel
Operating line lies below the equilibrium line
Pressure drop in the column is very high
Operating line lies above the equilibrium line

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Mass Transfer
Flights in a rotary dryer are provided to

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

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