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Mass Transfer

Mass Transfer
According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity)

D
1/D
D2
D0.5

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

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

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Mass Transfer
Azeotropic distillation is employed to separate

Mixture with very high relative volatility
High boiling mixture
Constant boiling mixture
Heat sensitive materials

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Mass Transfer
The velocity, concentration and temperature boundary, for the boundary layer development on a flat plate during connective mass transfer will be same, if

NPr = NLe
NSc = NPr = NLe
NSc = NLe
NSc = 1

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Mass Transfer
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

Remain unchanged
Can either increase or decrease, depends on the system
Decrease
Increase

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Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Pressure rises
Temperature rises
Pressure falls
Temperature falls

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