Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Normally not; but is possible if infinite number of plates are put
Yes ; if the reflux ratio is maximum
Yes
Never

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Mass Transfer
Blowdown in a cooling tower

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

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