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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

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

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

None of these
Momentum diffusivity to the mass dif-fusivity
Momentum diffusivity to the thermal diffusivity
Thermal diffusivity to the mass diffusivity

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Mass Transfer
Molecular seives are regenerated by heating to __________ °C.

200-330
> 500
> 1000
< 150

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Mass Transfer
Make up water is required in a cooling tower to replace the water lost by

Drift
Evaporation
All of these
Blowdown and leakage

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Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Depends on the pressure of the system
Remains unchanged
Increases
Decreases

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Mass Transfer
Selectivity of the solvent used in solvent extraction should be

> 1
< 1
1

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