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Mass Transfer

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

5
2.5 to 3
3 to 4
1.2 to 1.5

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Mass Transfer
The equipment frequently used for adiabatic humidification-cooling operation with recirculating liquid is

Natural draft cooling tower
Spray chamber
None of these
Induced draft cooling tower

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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
In continuous distillation, the internal reflux ratio (Ri) and the external reflux ratio (Re) are related as

Ri = Re
Ri = Re/(1 - Re)
Ri = (1 - Re)/Re
Ri = Re/(1 + Re)

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Mass Transfer
Dry bulb temperature of the gas is __________ the wet bulb temperature.

None of these
Equal to
More than
Less than

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Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
0.0025
2.5
1.25

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