Mass Transfer
In case of unsaturated air

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

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Mass Transfer
In a counter-current liquid extractor

Only one of the liquids may be pumped at any desired rate
Liquid's flow rate depends upon the temperature and pressure
Both liquids flow at fixed rate
Both liquids can have any desired flow rate

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