Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

Evaporation
Blowdown and leakage
All of these
Drift

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Gas side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be increased
Liquid side mass transfer co-efficient should be decreased
Mass transfer co-efficient must be kept constant

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