Aquantity of a gas occupying 0.14m at 9.65bar and 371°c is heated during a constant volume process until the pressure reaches 41.4bar. the gas is then expand adibatically to a pressure of 2.76bar. given that r= 0.288 kj /kgk and gamma =1.41

Air inially occupying a volume of 1 m2 at 100 kpa, 27 c undergoes three internally reversible processes in series. process 1-2 compression to 500 kpa during which pv constant process 2-3 adiabatic expanslon to 100 kpa process 3-1: constant-pressure expansion to 100 kpa (a) calculate the change of entropy for each of the three processes. (b) calculate the heat and work involved in each process. (c) is this cycle a power cycle or refrigeration cycle?