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

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Mass Transfer
The dimension of diffusivity is same as that of the

Velocity head
Density
Kinematic viscosity
Molal concentration

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Mass Transfer
Which of the following provides maximum contact surface for a liquid-vapour system?

Wetted wall column
Seive-plate column
Bubble-cap plate column
Packed tower

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Mass Transfer
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

3
1
2
4

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Mass Transfer
A good solvent used for absorption should not have very high

Viscosity
Vapor pressure
All of these
Freezing point

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Mass Transfer
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Increases
Decreases
Remains same
Decreases linearly

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