Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with increase in wet bulb temperature
At the same relative humidity
And humidified
And dehumidified with decrease in wet bulb temperature

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Mass Transfer
Flights in a rotary dryer are provided to

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
Increase the residence time of the solid

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