Mass Transfer
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

Cooling and dehumidification
Heating and dehumidification at almost constant wet bulb temperature
Dehumidification with dry bulb temperature remaining constant
None of these

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Mass Transfer
Inside the distillation column, the

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

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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
None of these
Increase the residence time of the solid

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