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Mass Transfer

Mass Transfer
In a solution containing 0.30 Kg mole of solute and 600 kg of solvent, the molality is

0.5
1
0.6
2

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Mass Transfer
As the reflux ratio, in a continuous counter-current extraction is increased, the number of stages

Remain unchanged
Decrease
Can either increase or decrease, depends on the system
Increase

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Mass Transfer
Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the

Mass transfer co-efficient
Kinematic viscosity
Thermal diffusivity
Volumetric diffusivity

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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)

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

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Mass Transfer
If f is defined as above, then which of the following applies to a feed at dew point?

F = 1
F < 1
F > 1
0 < f < 1

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Mass Transfer
Absorption factor method is used to calculate the number of ideal stages, when

Operating line lies below the equilibrium line
Both operating and equilibrium lines are parallel
Operating line lies above the equilibrium line
Pressure drop in the column is very high

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