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Mass Transfer

Mass Transfer
The diffusivity (D) in a binary gas mixture is related to the pressure (P) as

D ∝ 1/P
D ∝ P0.5
D ∝ 1/P0.5
D ∝ 1/P1.5

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Mass Transfer
'ADDUCTS' and 'CLATHRATES' are used in case of

Crystallisation
Absorption
None of these
Extractive distillation

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Mass Transfer
The drying time between fixed moisture contents within the 'constant rate period' is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid )

T
T3
√T
T1.5

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Mass Transfer
Antibiotics are best handled in a

Podbielniak extractor
Pulsed column extractor
Rotating disc contactor
Sieve tray contractor

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Mass Transfer
The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = __________

3
2
4
1

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Mass Transfer
Stage efficiency in a leaching process depends on the

Vapour pressure of the solution
Time of contact between the solid and the solution
Both A & B
Rate of diffusion of the solute through the solid and into the liquid

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