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Mass Transfer

Mass Transfer
In case of gases, the binary diffusivity is proportional to (where, P = pressure)

1/P
√P
P
1/√P

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

And equilibrium lines are parallel
Is far from the equilibrium line
Lies above the equilibrium line
Lies below the equilibrium line

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Mass Transfer
__________ extractor is used for the concentration of radioactive nuclear waste.

Mixer-settler
None of the listed here
Pulsed column
Seive plate

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Mass Transfer
The feed to fractionating column is changed from saturated vapour to saturated liquid. If the separation and reflux ratio remains unchanged, the number of ideal stages will

Increase
Depend on saturated boiling point; may increase or decrease
Decrease
Remains same

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Mass Transfer
Steam distillation is used to separate

Azeotropes
Heat sensitive materials
Mixtures of low relative volatility
High boiling substances from nonvolatile impurities

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Mass Transfer
Lewis number (Le) is

Sc x Pr
St x Sh
Pr x St
Sh x Pr

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