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

All of these
Evaporation
Blowdown and leakage
Drift

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Mass Transfer
Flash distillation is

Most useful for handling binary systems
Used for multicomponent systems like crude refining
Same as simple distillation
Same as differential distillation

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Mass Transfer
Channelling is most severe

In dumped packing of regular units
At very high liquid flow rate
In towers packed randomly with crushed solids
In towers packed with stacked packing

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