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Mass Transfer

Mass Transfer
Diameter to height ratio for a rashig ring is

1
5
2
0.5

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Mass Transfer
Unit of molal diffusivity is

Gm moles/cm. sec
Cm²/sec gm . mole
Gm moles/cm² . sec
Gm moles/cm². sec

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Mass Transfer
Desirable value of absorption factor in an absorber is

< 1
> 1
0.5
1

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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
6
12
8

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Mass Transfer
(NSh/NRe.NSc) is termed in mass transfer operation as the

Thermal diffusivity
Stanton number
Momentum diffusivity
Peclet number

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Mass Transfer
To increase the absorption factor, (where, G = gas flow rate, S = solvent flow rate)

Increase 'S' and decrease 'G'
Increase 'G' and decrease 'S'
Decrease both 'G' and 'S'
Increase both 'G' and 'S'

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