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
No
Yes
Yes ; but height of cooling tower will be prohibitively high

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Only liquid phase obeys Dalton's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law
Only vapor phase follows Raoult's law

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