Mass Transfer
Make up water is supplied during cooling tower operation to compensate for water losses due to

Blowdown
Evaporation
Entrainment
All of these

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Mass Transfer
Relative humidity is the ratio of the

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

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