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Mass Transfer

Mass Transfer
Surface renewal model of mass transfer was enunciated by

Danckwerts
Stefan
Toor and Marchello
Fick

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Mass Transfer
Unit of molal diffusivity is

Gm moles/cm². sec
Gm moles/cm. sec
Gm moles/cm² . sec
Cm²/sec gm . mole

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Mass Transfer
Relative volatility does not change appreciably with the change in

None of these
Vapour pressure of either component
Temperature
Total pressure

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Mass Transfer
The operating cost of a distillation column at minimum reflux ratio is

Infinite
Maximum
Zero
Minimum

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Mass Transfer
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

Decreases
Increases
Increases linearly
Remains same

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Mass Transfer
Separation of __________ employs gaseous diffusion process.

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

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