In an engine working on Otto cycle, air has a pressure of 1.0 bar and temperature \(30^{\circ} \mathrm{C}\) at the entry. Air is compressed with a compression ratio of 6 . The heat is added at constant volume until the temperature rises to \(1,500^{\circ} \mathrm{C}\). Determine: (i) air standard efficiency, (ii) pressure and temperature at the end of compression, and (iii) heat supplied. Take \(\mathrm{Cv}=0.718 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}, \mathrm{R}=\) \(0.287 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\).