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Mass Transfer

Mass Transfer
Stefan's law describes the mass transfer by

Bulk flow
Neither A nor B
Both A & B
Diffusion

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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
With decrease in the throughput (compared with the design capacity) for a bubble cap distillation column, its efficiency

May increase or decrease ; depends on individual design
Increases
Decreases
Remains same

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Mass Transfer
For the case of flow of air past a wet bulb thermometer (air water vapour system), the approximate value of H₂/ky.Cz is around

0.24
0.72
1
0.6

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Mass Transfer
The cooling effect in a cooling tower can not be increased by

None of these
Reducing the humidity of entering air
Lowering the barometric pressure
Increasing the air velocity over the wet surfaces

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Mass Transfer
In McCabe-Thiele method, at infinite reflux ratio

Neither A nor B
Both A & B
Both the operating lines coincide with diagonal
The overhead product is minimum

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