Mass Transfer
In a packed tower, the value of HETP equals HTUOG, when the equilibrium and the operating lines are (where, HETP = height equivalant to a theoretical plate HTUOG = overall gas phase height of a transfer unit)

Parallel
Straight
Both A & B
Neither A nor B

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

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Mass Transfer
Steam distillation is used to

Reduce the number of plates
Increase the total pressure of distillation
Avoid thermal decomposition of a component
Increase the efficiency of separation

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