Mass Transfer
In case of unsaturated air

Both of the options given here
Wet bulb temperature < dry bulb temperature
Dew point < wet bulb temperature
None of the listed here

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Mass Transfer
Flights in a rotary dryer are provided to

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
None of these

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