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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
D2
1/D
D0.5

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Mass Transfer
In a distillation column, with increase in the reflux ratio, the heat removed in the cooler

Decreases
Remains unaffected
And the heat required in reboiler decreases
Increases

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Mass Transfer
Molecular diffusivity of a liquid

May increase or decrease with temperature
Increases with temperature
Is independent of temperature
Decreases with temperature

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Mass Transfer
The Schmidt number which is defined as, μ/ρ D, is the ratio of the

None of these
Momentum diffusivity to the mass dif-fusivity
Momentum diffusivity to the thermal diffusivity
Thermal diffusivity to the mass diffusivity

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Mass Transfer
Pick out the correct relationship. (where, Ri = internal reflux ratio Ro = external reflux ratio. )

(1 - Ri) = Ro/Ri
(1 + Ro) = Ro/Ri
(1 + Ri) = Ro/Ri
(1 - Ro) = Ro/Ri

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

Isotopes of helium
SO₂ and air
Isotopes of uranium
N₂ and O₂ from air

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