Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Liquid flow increases while the vapor flow decreases for a system
Slope of the operating line in stripping section decreases
Number of plates decreases very slowly first and then more and more rapidly
Total cost first decreases and then increases

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Mass Transfer
Steam distillation is used to

Increase the total pressure of distillation
Increase the efficiency of separation
Reduce the number of plates
Avoid thermal decomposition of a component

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Mass Transfer
Flights in a rotary dryer are provided to

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

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