A mass of air is initially at $260^{\circ} \mathrm{C}$ and 700 kPa , and occupies $0028 \mathrm{~m}^{3}$. The air is expanded at constant pressure to $0.084 \mathrm{~m}^{3}$. A polytropic process with $\mathrm{n}=1.50$ is then carried out, followed by a constant temperature process which completes a cycle. All the processes are reversible. (a) Sketch the cycle in the $p-v$ and $T$-s planes. (b) Find the heat received and heat rejected in the cycle. (c) Find the efficiency of the cycle.
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