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Mass Transfer

Mass Transfer
According to Chilton-Colburn analogy for mass transfer, NSt.NSc2/3 is equal to

F/2
2f
F
1/f

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Mass Transfer
Acetone is to be removed from air in an isothermal dilute absorber using pure water as solvent. The incoming air contains 5 mole% of acetone (yin = 0.05). The design equation to be used for obtaining the number of trays (N) of the absorber is, N+2 = 6 log (yin/yout).For 98% recovery of acetone, the number of trays required is/are

10
1
9
8

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Mass Transfer
The most economical range of absorption factor is

5 to 10
2.5 to 3
1.25 to 2
2 to 2.5

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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

Neither A nor B
Range is 15°F
Both A & B
Approach is 10°F

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Mass Transfer
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

Increases
Increases linearly
Decreases
Remains same

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Mass Transfer
Selectivity of the solvent used in solvent extraction should be

1
> 1
< 1

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