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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
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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Mass Transfer
__________ developed the film theory.

Fick
Higbie
Ergun
Levenspeil

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Mass Transfer
Air at a particular humidity is heated in a furnace. The new dew point

Depends on the extent of heating
Remain unchanged
Decreases
Increases

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Mass Transfer
Molecular diffusivity of a liquid

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

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Mass Transfer
Which is the controlling factor for a drum drier?

Neither A nor B
Diffusion
Heat transfer
Both A & B

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