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Mass Transfer

Mass Transfer
Mechanism of moisture removal in case of freeze drying of food stuff is by

Adsorption
Evaporation
Sublimation
Dehydration

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Mass Transfer
Operating velocity in a packed tower is usually __________ the flooding velocity.

More than
Equal to
Twice
Half

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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
1
2
0.56

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Mass Transfer
Components, having widely different boiling point in a binary mixture, can be separated using __________ distillation.

Molecular
Steam
Simple
Extractive

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Mass Transfer
Milk is dried usually in a __________ dryer.

Freeze
Spray
Rotary
Tray

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Mass Transfer
Azeotropism for ethyl alcohol-water system disappears by

No means
Increasing temperature
Decreasing pressure
Increasing pressure

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