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Mass Transfer

Mass Transfer
A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.

70-80
30-40
44119
90-100

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Mass Transfer
Which of the following is not fixed by the process requirements, in the design of absorbers?

Composition of the entering liquid
Flow rate of the entering gas
None of these
Terminal concentrations of gas stream

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Mass Transfer
In distillation columns, the number of bubble caps per tray primarily depends upon the

Allowable gas velocity
Allowable gas and liquid velocities
Feed composition
Allowable liquid velocity

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Mass Transfer
For which of the following unit operations, Lewis number is of significance?

Humidification
Binary distillation
Adsorption
Gas absorption

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Mass Transfer
Overall efficiency of the distillation column is

The ratio of number of actual plates to ideal plates
Always more than the point efficiency
Same as the Murphree efficiency
The ratio of number of ideal plates to actual plates

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Mass Transfer
Desulphurisation of petrol is done in a

Rotating disc extractor
Packed extraction column
Bollman extractor
Plate type extraction column

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