Q 40. The pressure, temperature and velocity of air flowing in a pipe are 5 bar, 500 K
and 50 m/s, respectively. The specific heats of air at constant pressure and at
constant volume are 1.005 kJ/kg K and 0.718 kJ/kg K, respectively. Neglect
potential energy. If the pressure and temperature of the surrounding are 1 bar
and 300 K, respectively, the available energy in kJ/kg of the air stream is
(A) 170
(B) 187
(C) 191
(D) 213
Answer: (B)
Explanation:
