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Mass Transfer

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

Minimum
Optimum
Infinite
None of these

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Mass Transfer
As per Gilliland's equation, the diffusivity is

Directly proportional to 'T1.5'
Dependent on the molecular volume & molecular weight of components
Inversely proportional to 'P'
All of these

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Mass Transfer
Solvent used in extractive distillation

Does not alter the relative volatility of the original components
Forms a high boiling azeotrope
Is of low volatility
Forms a low boiling azeotrope

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Mass Transfer
Humid volume, at a given temperature is a/an __________ function of humidity.

Inverse
Exponential
Linear
Logarithmic

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Mass Transfer
Though, theoretically the adsorption & desorption isotherms is expected to coincide but sometimes at least a part of the isotherms does not coincide and this phenomenon is known as adsorption hysterisis. In such cases, the desorption equilibrium pressure is __________ that obtained for adsorption.

Higher than
Lower than
Either same or higher than
Same as

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Mass Transfer
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)

L/(FG.G)
FG/(G.a)
(G.a)/FG
F/(FG.a)

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