Mass Transfer
Relative humidity is the ratio of the

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

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

Helps in increasing the bubble size entering the settler
All of these
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the settling rate of the bubbles

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Mass Transfer
The term "cooling range" in a cooling tower refers to the difference in the temperature of

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering the tower and the wet bulb temperature of the surrounding air
None of the listed here
Hot water entering the tower and the cooled water leaving the tower

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