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Mass Transfer

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

1.2 to 1.5
3 to 4
2.5 to 3
5

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

Absorption
None of these
Distillation
Solvent extraction

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Mass Transfer
In liquid extraction, if the selectivity is unity, then

Separation of the constituents is the most effective
No separation will occur
Solvent flow rate should be very low
Amount of solvent required will be minimum

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Mass Transfer
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

Composition
All of these
Total pressure
Temperature

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Mass Transfer
When both the fluids flow concurrently in an absorber, the slope of the operating line is

- ve
-1
1
+ ve

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Mass Transfer
______ extractor uses centrifugal force for separating the two phases.

Schiebel
Treybal
Podbielniak
None of the listed here

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