Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

Plate absorption column
McCabe-Thiele method
Enthalpy concentration method
Ponchan-Savarit method

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Mass Transfer
Blowdown in a cooling tower

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

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