Engineering :: Refrigeration and Air conditioning

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On a particular time of a day if dry bulb temperature is equal to the wet bulb temperature, then it can be safely concluded that

[A].	Specific humidity of air was 0.010 kg per kg of dry air	[B].	Dew point was less than 20?C
[C].	Relative humidity of air was 100%	[D].	Atmospheric air was free from moisture
[E].	Rain had occurred one or two hours earlier

Answer: Option C