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Mass Transfer

Mass Transfer
During drying operation, it is easier to remove the __________ moisture.

Equilibrium
Critical
Unbound
Bound

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Mass Transfer
HETP is numerically equal to HTU, only when the operating line

Lies above the equilibrium line
And equilibrium lines are parallel
Is far from the equilibrium line
Lies below the equilibrium line

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Mass Transfer
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by

Continuous distillation
Evaporation
Solvent extraction
Absorption

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Mass Transfer
Molecular diffusivity of a liquid

Is independent of temperature
Decreases with temperature
May increase or decrease with temperature
Increases with temperature

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Mass Transfer
Can the efficiency of a plate in the distillation tower be greater than 100%?

Yes
Never
Normally not; but is possible if infinite number of plates are put
Yes ; if the reflux ratio is maximum

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Mass Transfer
In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)

8.25
8.89
6.89
10

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