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Mass Transfer

Mass Transfer
Most important factor to be considered in the selection of packings for absorbers is the __________ of packing.

Durability
Size
Porosity
Cost

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Mass Transfer
In which of the following unit operations, the selectivity is an important parameter?

None of these
Absorption
Solvent extraction
Distillation

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Mass Transfer
The value of L/mG ratio for economical absorption operation ranges from

0.5 to 0.8
1.25 to 2.0
2.5 to 3.5
0.8 to 1.2

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Mass Transfer
The dew point of an unsaturated gas-vapor mixture does not depend upon the __________ of the mixture.

All of these
Total pressure
Temperature
Composition

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Mass Transfer
To remove all the moisture from a wet solid it requires exposure to __________ air.

Perfectly dry
Highly humid
High temperature
None of these

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Mass Transfer
Positive deviation from Raoult's law means a mixture whose total pressure is

Greater than that computed for ideality
Less than that computed for ideality
Less than the sum of the vapour pressure of the components
None of these

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