Mass Transfer
Which of the following remains constant during evaporative cooling process with recirculated water supply?

Relative humidity
Partial pressure of vapour
None of these
Wet bulb temperature

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Mass Transfer
Flights in a rotary dryer are provided to

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
Increase the residence time of the solid

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