In an Otto cycle, air at 1 bar and \(300 \mathrm{~K}\) is compressed isentropically until the pressure rises to 16 bar. The heat is added at constant volume until the pressure rises to 30 bar. Calculate the air standard efficiency and mean effective pressure of the cycle. Take \(C_{\mathrm{v}}=0.717 \mathrm{~kJ} / \mathrm{kgK} ; \mathrm{R}=\) \(8.314 \mathrm{~kJ} / \mathrm{kg}\) mole.