An ideal otto cycle operates with a temperature of 370 c at the end of the compression process, a maximum temperature of 1510 c and a minimum temperature of 20 c. what is the temperature at the beginning of the heat rejection process, c?

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?