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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm/sec
Cm²/seC₂
Cm³/sec
Cm²/sec

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Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Free
Bound
Critical
Unbound

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Mass Transfer
In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the

Approach is 10°F
Range is 15°F
Both A & B
Neither A nor B

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Mass Transfer
__________ is used as an 'entrainer' for the separation of acetic acid-water mixture by distillation.

Hexane
Benzol
Furfural
Butyl acetate

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Mass Transfer
In extraction, as the temperature increases, the area of hetrogeneity (area covered by binodal curve)

None of these
Remains unchanged
Increases
Decreases

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Mass Transfer
Weeping in a distillation column

Results due to very high gas velocity
Provides large interfacial surface for mass transfer
Increases tray efficiency
Results due to very low gas velocity

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