Mass Transfer
For the same process conditions, the reflux ratio of an unlagged distillation column

Decreases in winter
Increases in summer
None of these
Increases in winter

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Mass Transfer
Entrainer used in azeotropic distillation should

Have high latent heat of vaporisation
Have high viscosity to provide high tray efficiency
Form a new azeotrope of low relative volatility with one of the constituents of the mixture
Form a low boiling azeotrope with one of the constituents of the mixture

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Mass Transfer
Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled

And dehumidified with decrease in wet bulb temperature
And humidified
And dehumidified with increase in wet bulb temperature
At the same relative humidity

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