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Mass Transfer

Mass Transfer
Large scale drying of sugar is done in a __________ dryer.

Tray
Rotary
Spouted bed
Truck

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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
1.56
2

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Mass Transfer
In a packed absorption tower, if the equilibrium and operating lines are both straight lines, then the ratio, HETP/HTUOG __________ the absorption factor.

Both A and B
Is one at unity value of
Increases with increase in
Neither A nor B

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Mass Transfer
Which of the following is not fixed by the process requirements, in the design of absorbers?

None of these
Composition of the entering liquid
Flow rate of the entering gas
Terminal concentrations of gas stream

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Mass Transfer
Agitator is provided in a crystalliser for

Crystal growth
Avoiding deposition on cooler surfaces
All of these
Formation of nuclei

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Mass Transfer
In a counter-current extractor, as the axial mixing increases, the extraction efficiency

Remains unchanged
Increases
Decreases
Depends on the pressure of the system

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