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Mass Transfer

Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

Half
Twice
Equal to
More than

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Mass Transfer
Surface renewal model of mass transfer was enunciated by

Fick
Stefan
Toor and Marchello
Danckwerts

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

None of these
Distillation
Absorption
Solvent extraction

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Mass Transfer
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Decreases linearly
Increases
Remains same
Decreases

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Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Both A & B
Range is 15°F
Approach is 10°F
Neither A nor B

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Mass Transfer
The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the __________ temperature.

None of these
Wet bulb
Dry bulb
Dew point

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