Q 42. A moist air sample has dry bulb temperature of 30℃ and specific humidity of 11.5 g water vapour per kg dry air. Assume molecular weight of air as 28.93. If the saturation vapour pressure of water at 30℃ is 4.24 kPa and the total pressure is 90 kPa, then the relative humidity (in %) of air sample is
(A) 50.5
(B) 38.5
(C) 56.5
(D) 68.5
Answer: (B)
Explanation:
