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Mass Transfer

Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

5
1.2 to 1.5
3 to 4
2.5 to 3

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

44119
30-40
70-80
90-100

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Mass Transfer
Calculation of mass transfer co-efficient is mostly/normally done using __________ theory.

Penetration
Film
None of the listed here
Surface renewal

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Mass Transfer
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.

None of these
< 100
100
> 100

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Mass Transfer
Dry bulb temperature of unsaturated air is more than its __________ temperature.

Wet bulb
Both A & B
Dew point
Neither A nor B

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Mass Transfer
Weeping in a distillation column

Results due to very low gas velocity
Results due to very high gas velocity
Provides large interfacial surface for mass transfer
Increases tray efficiency

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