Mass Transfer
Flights in a rotary dryer are provided to

None of these
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

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Mass Transfer
In case of a desorber (stripper), the

Temperature remains unaffected
Operating line always lies below the equilibrium curve
Operating line always lies above the equilibrium curve
Temperature always increases

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Mass Transfer
In case of absorption with exothermic reaction, for fluids having

Both A & B
Pr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence
Pr = Sc = 1; total mass, momentum and thermal diffusivity will be the same
Pr = Sc ; there won

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