Mass Transfer
Separation of two volatile liquids by distillation makes use of their

Selectivity
Density difference
Solubility
Relative volatility

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Mass Transfer
The wetted wall tower is used to determine

The overall M.T.C. of the system
Individual mass transfer co-efficient (M.T.C.) in gaseous system
M.T.C. of liquid in liquid-gas system
M.T.C. of individual components in a liquid-liquid system

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Mass Transfer
Blowdown in a cooling tower

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

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