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

Entrainment
Evaporation
All of these
Blowdown

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Mass Transfer
As the reflux ratio in a distillation coloumn is increased from the minimum, the

Slope of the operating line in stripping section decreases
Liquid flow increases while the vapor flow decreases for a system
Number of plates decreases very slowly first and then more and more rapidly
Total cost first decreases and then increases

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