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

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Mass Transfer
Which of the following assumes constant molal vaporisation and overflow?

Ponchan-Savarit method
McCabe-Thiele method
Enthalpy concentration method
Plate absorption column

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Mass Transfer
Relative volatility does not change appreciably with the change in

Vapour pressure of either component
Temperature
Total pressure
None of these

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

< 1
> 1
1

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

1
4
2
3

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Mass Transfer
Binary distillation involves the mass transfer by __________ at the gas-liquid interface.

Unidirectional diffusion from liquid to gas phase
A counter diffusion at an almost equal molar rate
Either A or B
Unidirectional diffusion from gas to liquid phase

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