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Mass Transfer

Mass Transfer
The unit of volumetric diffusivity is

Cm³/sec
Cm²/sec
Cm²/seC₂
Cm/sec

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Mass Transfer
The solvent used in liquid-liquid extraction should have __________ less than one.

Selectivity
Both A & B
Distribution co-efficient
Neither A nor B

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Mass Transfer
The cooling effect in a cooling tower can not be increased by

None of these
Reducing the humidity of entering air
Increasing the air velocity over the wet surfaces
Lowering the barometric pressure

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Mass Transfer
In case of unsaturated air

Wet bulb temperature < dry bulb temperature
None of the listed here
Both of the options given here
Dew point < wet bulb temperature

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Mass Transfer
Chemisorption compared to physical absorption has

None of these
Lower adsorption rate
Increased utilisation of stagnant zones of the liquid phase
Lower capacity of the solvent for the solute gas

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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

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

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