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Mass Transfer

Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

(1 - f)/f
- (f - 1)/f
- 1/f
- f/(1 - f)

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Mass Transfer
When the __________ the relative humidity of air decreases, despite an increase in the absolute humidity.

Temperature falls
Temperature rises
Pressure falls
Pressure rises

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

0 and ≈ 1
< 1 and ≈ 1
1 and 0
>1 and ≈ 1

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Mass Transfer
Water-ethyl alcohal solution can be concentrated (in respect of alcohal concentration) by __________ distillation.

Atmospheric
None of these
High pressure
Vacuum

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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

8
1
10
9

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

1/f
F/2
F
2f

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