Mass Transfer
Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air?

Dew point
None of these
Dry bulb temperature
Wet bulb temperature

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Mass Transfer
To get high tray efficiency

Interfacial surface between liquid and gas phase should be large
Gas velocity should be very low
Liquid entrainment should be severe
Time of contact between the two phases should be less

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Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
Actual humidity to saturation humidity
Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
None of these

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