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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.

30-40
70-80
44119
90-100

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Mass Transfer
When a multistage tray tower uses a minimum reflux ratio, it implies

Infinite trays and maximum reboiler heat load
Infinite trays and minimum reboiler heat load
Minimum trays and maximum reboiler heat load
Minimum trays and minimum reboiler heat load

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-1 cm²/sec
10-4 cm²/seC₂
10-9 cm/sec
10-3 sec/cm

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Mass Transfer
At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is __________ percent.

50
Between 0 and 100
100

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Mass Transfer
Ordinary diffusion process is also called __________ diffusion.

Thermal
Pressure
Concentration
Forced

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Mass Transfer
Stefan's law describes the mass transfer by

Both A & B
Bulk flow
Neither A nor B
Diffusion

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