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Mass Transfer

Mass Transfer
The slope of the operating line for a single component co-current absorber when plotted in terms of mole ratio units is

+ve
-ve
∞

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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)

100
1000
500
50

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Mass Transfer
__________ diffusion is used for separating the isotopes of methane.

Force
Thermal
Pressure
Concentration

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Mass Transfer
Cox chart is useful in the design of

Dryer
Crystalliser
Evaporator
Distillation column

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Mass Transfer
If a₁ and a₂ are the relative volatilities when the pressure in the distillation column is 1 and 2 atm respectively. Pick out the correct statement.

a₁ = a₂
a₁ = 2a₂
None of these
a₁ = 0.5 a₂

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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)

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

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