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Mass Transfer

Mass Transfer
In case of liquids, the binary diffusivity is proportional to (where, T = temperature)

T
1/T
√T
T²

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Mass Transfer
The binary diffusivity in gases at atmospheric conditions is about

10-9 cm/sec
10-1 cm²/sec
10-3 sec/cm
10-4 cm²/seC₂

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Mass Transfer
What is the reflux ratio at total reflux?

Unity
Zero
Data insufficient
Infinity

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Mass Transfer
Drying operation under vacuum is carried out to

Increase drying temperature
Reduce drying temperature
Dry materials having high bound moisture content
Dry those materials which have very high unbound mositure content

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Mass Transfer
In azeotropic mixture, the equilibrium vapour composition is

Less than liquid composition
More than liquid composition
None of the listed here
Same as liquid composition

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Mass Transfer
For turbulent mass transfer in pipes, the Sherwood number depends on the Reynolds number as

Re0.33
Re0.53
Re0.83
Re

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