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Mass Transfer

Mass Transfer
Alcohol is dehydrated using __________ distillation.

Azeotropic
Molecular
Extractive
Steam

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Mass Transfer
If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is

1
> 1
< 1

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Mass Transfer
__________ columns are used for liquid dispersion in a continuous gas phase.

Pulse
Sieve plate
Bubble cap
Packed

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Mass Transfer
The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m²/m³)

500
1000
100
50

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Mass Transfer
__________ developed the film theory.

Higbie
Ergun
Fick
Levenspeil

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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)

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

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