Mass Transfer
In case of unsaturated air

Wet bulb temperature < dry bulb temperature
None of the listed here
Dew point < wet bulb temperature
Both of the options given here

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Mass Transfer
Henry's law states that the

Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Partial pressure is equal to the product of the mole fraction and total pressure
Vapour pressure is equal to the product of the mole fraction and total pressure

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Mass Transfer
Blowdown in a cooling tower

All of these
Is undesirable
Increases the scale forming tendencies of water
Means discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities

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