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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
Reboiler is considered as one theoretical plate, because

Vapour is recycled to the column
Of the assumption that vapour and liquid leaving the reboiler are in equilibrium
Reboiler itself contains one plate
None of these

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Mass Transfer
In case of an ideal solution, the total vapor pressure varies __________ with the composition expressed as mole fraction,

None of these
Exponentially
Linearly
Inversely

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Mass Transfer
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.

None of these
100
> 100
< 100

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Mass Transfer
Which of the following is the most suitable for extraction in a system having very low density difference?

Centrifugal extractor
Mixer-settler extractor
Packed extraction tower
Pulsed extractor

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

Increases
Decreases
Depends on the pressure of the system
Remains unchanged

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