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Mass Transfer

Mass Transfer
When the psychometric ratio is __________ then the adiabatic saturation temperature and wet bulb temperature becomes equal.

1
< 1
?
> 1

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Mass Transfer
With increase in gas rate, the number of transfer units, NtoG, for a fixed degree of absorption by a fixed amount of solvent

Remains unaffected
Decreases
Decreases linearly
Increases

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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
1.56
2
1

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Mass Transfer
Nitrobenzene (boiling point = 210.6°C) is steam distilled at 1 atm pressure.Nitrobenzene will distill off __________ °C.

Between 100 and 210
At < 100
None of the listed here
At > 210.6

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Mass Transfer
Radioactive nuclear waste is treated in

Bollman extractor
Mixer-settler extractor
Rotating-disc contactor
Pulsed column extractor

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Mass Transfer
Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.

Plate
Packed
Baffle
None of these

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