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

None of these
Dew point
Dry bulb temperature
Wet bulb temperature

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Mass Transfer
Priming in a distillation column

Is desirable from point efficiency consideration
Reduces the overall pressure drop
Is characterised by the presence of foam throughout the space between trays
Results from very low gas velocity

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Mass Transfer
In an operating distillation column, the

Highest temperature is encountered at the top of the column
Vapors and liquids are at their dew point and bubble point respectively
Driving force for the vapor flow is the pressure drop, as the pressure decreases gradually from the bottom to the top of the column
Driving force for the liquid flow is its specific weight

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