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Mass Transfer

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

Vacuum rotary
Fluidised bed
Spouted bed
Tray

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Mass Transfer
Danckwerts developed the __________ theory.

Film
None of these
Surface renewal
Penetration

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Mass Transfer
Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of

Thermal diffusivity to mass diffusivity
Momentum diffusivity to thermal diffusivity
Mass diffusivity to momentum diffusivity
None of these

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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

1.56
2
0.56
1

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Mass Transfer
Alcohol is dehydrated using __________ distillation.

Molecular
Steam
Azeotropic
Extractive

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Mass Transfer
The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by

Both A & B
Neither A nor B
Raising the temperature
Lowering the total pressure

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