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Mass Transfer

Mass Transfer
__________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.

Packed
Tray
Bubble
Spray

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Mass Transfer
The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around

600
1
0.24
3.97

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Mass Transfer
Can a cooling tower cool water below the wet bulb temperature of inlet air?

Yes ; but the air flow rate should be excessively high
Yes
No
Yes ; but height of cooling tower will be prohibitively high

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

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

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Mass Transfer
Mass transfer co-efficient is defined as

Co-efficient = Flux/concentration difference
Flux = Co-efficient/concentration difference
None of the listed here
Flux=concentration difference/co-effi-cient

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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.

Bound
Free
Critical
Unbound

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