Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

No
Yes ; but height of cooling tower will be prohibitively high
Yes ; but the air flow rate should be excessively high
Yes

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Total pressure is less
Temperature is less
Saturated steam is used for steam distillation

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