Mass Transfer
Unsaturated air (with dry bulb and wet bulb temperatures being 45°C and 25°C respectively) is passed through a water spray chamber maintained at 23°C. The air will be cooled and

Humidified with wet bulb temperature decreasing
Humidified at constant wet bulb temperature
None of these
Dehumidified

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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
None of these
Pressure increases gradually from bottom to the top of the column

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Increases pressure drop, increases surface area
Decreases pressure drop, decreases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, increases surface area

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