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Mass Transfer

Mass Transfer
The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases 'A' and 'B' is

0.5
2
∞
1

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Mass Transfer
If Rm is the minimum reflux ratio, the optimum reflux ratio may be around __________ Rm.

3 to 4
5
1.2 to 1.5
2.5 to 3

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Mass Transfer
If f = moles of vapour present per mole of feed, then the slope of feed line is

- 1/f
(1 - f)/f
- f/(1 - f)
- (f - 1)/f

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Mass Transfer
Percentage saturation is __________ the relative saturation.

Always smaller than
None of these
Not related to
Always greater than

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Mass Transfer
Flash distillation is suitable for separating the constituents of a binary system, which

Have very close boiling points
Have very wide boiling points
Form minimum boiling azeotrope
Form constant boiling azeotrope

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = 2a₂
a₁ = 0.5 a₂
None of these
a₁ = a₂

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