1.3 1 kg of air has a volume of 85 litres and a temperature of 150ºC. The air is heated at  constant volume until the temperature is 250ºC. It is then expanded according to the law Pv1.3 =  C until the pressure has halved. R for air is 0.287 kJ/kg.K and Cp = 1.005 kJ/kg.K. (a) Calculate the change in entropy during the constant volume heating process (b) Calculate the pressure at the beginning and end of constant volume process, the  temperature and pressure at the end of expansion and the volume at the end of expansion. (c) Calculate the change in entropy during the expansion

Elements Of Electromagnetics
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1.3 1 kg of air has a volume of 85 litres and a temperature of 150ºC. The air is heated at 
constant volume until the temperature is 250ºC. It is then expanded according to the law Pv1.3 = 
C until the pressure has halved. R for air is 0.287 kJ/kg.K and Cp = 1.005 kJ/kg.K.
(a) Calculate the change in entropy during the constant volume heating process
(b) Calculate the pressure at the beginning and end of constant volume process, the 
temperature and pressure at the end of expansion and the volume at the end of expansion.
(c) Calculate the change in entropy during the expansion

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