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Mass Transfer

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

1
3
2
4

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Mass Transfer
When the feed to a distillation column is a saturated liquid, slope of the feed line is

None of these
Infinity
Unity
Zero

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Mass Transfer
Schimdt number and Lewis number for pure air at atmospheric conditions are respectively

1 and 0
< 1 and ≈ 1
0 and ≈ 1
>1 and ≈ 1

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Mass Transfer
Molarity is defined as the number of gm moles of solute per __________ of solvent.

Gm
Kg
c
Litre

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Mass Transfer
For a binary mixture with low relative volatility, continuous rectification to get pure products will require

Less number of trays
Small cross-section column
Low reflux ratio
High reflux ratio

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

T
T²
√T
T³

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