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Mass Transfer

Mass Transfer
If f is defined as above, then which of the following applies to a feed at dew point?

F > 1
F = 1
F < 1
0 < f < 1

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Mass Transfer
The suitable evaporator for concentration of foaming liquids is a __________ evaporator.

Short tube
Falling film
Long tube
Vacuum

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Mass Transfer
The percentage humidity is less than the relative humidity only at __________ percent humidity.

None of these
Both zero and hundred
Zero
Hundred

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Mass Transfer
Mass transfer co-efficient (K) and diffusivity (D) are related according to film theory as

K ∝ √D
K ∝ D2
K ∝ D
K ∝ D1.5

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Mass Transfer
Which of the following mixtures does not form an azeotrope at atmosheric pressure?

Butyl acetate-water
Water-alcohol
None of these
Methyl alcohol-acetone

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Mass Transfer
As the reflux ratio decreases, the

Number of plates increases
Column diameter increases
None of these
Separation becomes more efficient

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