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Mass Transfer

Mass Transfer
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of

0.6
1.5
-0.6
-1.5

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Mass Transfer
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?

Bubble cap tower
Perforated tray tower
Wetted wall tower
Grid tray tower

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Mass Transfer
Leaching of sugar from sugar beets is done by

Hot water
Dilute H₂SO₄
Lime water
Hexane

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Mass Transfer
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the

Pressure rises
Pressure falls
Temperature falls
Temperature rises

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Mass Transfer
The mass transfer co-efficient for a solid sphere of radius 'a' dissolving in a large volume of quiescent liquid, in which D is the diffusivity of solute, is

D/2a
Dependent on the Reynolds number
Proportional to √D
D/a

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Mass Transfer
H₂S is being absorbed in a gas absorber unit. The height of the transfer unit based on the overall mass transfer coefficient on the gas side is 0.4 m. The equilibrium data is given by, y = 1.5 x. The bulk concentration of H₂S has to be reduced from 0.05 to 0.001 mole fraction in the gas side. The height of the tower (in metres) corresponding to an operating line given by, y = 5x + 0.001 is

0.56
1
2
1.56

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