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Mass Transfer

Mass Transfer
Liquid diffusivity is of the order of __________ cm² /second.

0.01
> 1
10-5 to 10-6
0.1

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Mass Transfer
Water entrained by circulating air in cooling towers is termed as

Vapor load
None of the listed here
Drift
Blow down

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Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NSc = 1
NSc = NLe
NSc = NPr = NLe
NPr = NLe

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Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Tray
Packed
Spray
Bubble

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Mass Transfer
According to the Fenske equation, what will be the minimum number of plates required in a distillation column to separate an equimolar binary mixture of components A and B into an overhead fraction containing 99 mol% A and a bottom fraction containing 98 mol% B? Assume that relative volatility (αAB = 2) does not change appreciably in the coloumn.

10
12
8
6

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

5
1.2 to 1.5
3 to 4
2.5 to 3

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