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

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

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Number of plates decreases very slowly first and then more and more rapidly
Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system
Total cost first decreases and then increases

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