$2.$ An air standart cycle is executed in a closed system with $0,005$ Ibm of air and consists of the following three processes:$1-2$: Isentropic compression from $14,7$ psia and $80\backslash$deg F to $120$ psia$2-3$: P$=$ constant heat addition to initial specific vol$$me$3-1$: v$=$ constant heat rejection to initial statea$)$ Show the cycle on P$-$v and T$-$s diagrams.b$)$ Calculate the maximum temperature in the cycle.c$)$ Determine the thermal efficiency.