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Mass Transfer

Mass Transfer
The rough value of diffusion co-efficient of water vapor into air at 25°C may be about __________ cm²/sec.

0.25
1.25
2.5
0.0025

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Mass Transfer
Which of the following parameters remains almost constant during adiabatic saturation of unsaturated air?

Wet bulb temperature
None of these
Dew point
Dry bulb temperature

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Mass Transfer
Percentage saturation is __________ the relative saturation.

Not related to
None of these
Always greater than
Always smaller than

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Mass Transfer
At the same gas flow rate, the pressure drop in a packed tower being irrigated with liquid __________ that in dry packed tower.

Cannot be predicted as data are insufficient
Is greater than
Is same as
Is lower than

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Mass Transfer
Azeotropic distillation is employed to separate

Constant boiling mixture
Mixture with very high relative volatility
High boiling mixture
Heat sensitive materials

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Mass Transfer
If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be __________ percent.

None of these
100
< 100
> 100

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