Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Saturated steam is used for steam distillation
Total pressure is less
Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Temperature is less

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Mass Transfer
Relative humidity is the ratio of the

None of these
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature

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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
None of these
Reduce the residence time of solid

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