Mass Transfer
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

Spray chamber
None of these
Induced draft cooling tower
Natural draft cooling tower

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Mass Transfer
Inside the distillation column, the

Driving force for the vapour flow is the pressure drop
Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column
None of these

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Mass Transfer
Flights in a rotary dryer are provided to

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

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