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Mass Transfer

Mass Transfer
Paper industry employs __________ driers.

Spray
Rotary
Fluidised bed
Cylinder

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Mass Transfer
The ratio of Murphree plate efficiency to point efficiency is always > 1 in a __________ flow model.

Perfectly mixed
Both plug & perfectly mixed
Plug
None of the listed here

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Mass Transfer
Low viscosity absorbent is preferred for reasons of

Improved flooding characteristics
All of these
Rapid absorption rates and good heat transfer characteristics
Low pressure drop on pumping

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Mass Transfer
Bound moisture is that liquid which exerts an equilibrium vapor pressure __________ that of the pure liquid at the given temperature.

Less than
More than
Either A or B; depends on the solid
Equal to

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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

2
0.56
1.56
1

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Mass Transfer
With increase in the mass velocity of the gas, the rate of drying during the constant rate period __________ , if the conduction and radiation through the solid are negligible.

Remains same
Increases linearly
Decreases
Increases

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