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Mass Transfer

Mass Transfer
Prandtl number for water at 20°C is about

7
0.7
150
70

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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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Mass Transfer
'ADDUCTS' and 'CLATHRATES' are used in case of

Absorption
Crystallisation
None of these
Extractive distillation

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Mass Transfer
Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture.

Free
Unbound
Bound
Equilibrium

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Mass Transfer
Azeotropism for ethyl alcohol-water system disappears by

Increasing temperature
No means
Increasing pressure
Decreasing pressure

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Mass Transfer
With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas

Decreases linearly
Remains same
Increases
Decreases

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