Mass Transfer
Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for

Constant relative volatility
All of these
Constant molal overflow
Total reflux

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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

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

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