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Mass Transfer

Mass Transfer
At what percentage (by volume) of alcohol composition, it forms an azeotrope with water?

90
99
95
91.5

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Mass Transfer
Pick out the system with maximum boiling azeotrope at 1 atm.

Ethyl alcohol-water
Benzene-ethyl alcohol
Acetone chloroform
None of these

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Mass Transfer
In the layout plan for a vacuum distillation unit, operating at 60 mm Hg, supported by a barometric condenser, the appropriate place for the location of vacuum drum for collecting the distillate will be

At ground level
10 metres above ground
2 metres above the ground
5 metres above ground

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Mass Transfer
The main reason for dividing a tall packed tower into series of small towers is to

Minimise the overall pressure drop
Reduce liquid hold up
Avoid flooding
Avoid channeling

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Mass Transfer
Flash distillation is suitable for the separation of components

Which form maximum boiling azeotrope
Which form minimum boiling azeotrope
Having very close boiling points
Having very wide boiling points

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

Proportional to √D
D/a
D/2a
Dependent on the Reynolds number

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