A gas engine working on ideal Otto cycle has a compression ratio of 6.1. The pressure and temperature at the commencement of compression are 1 bar and \(27^{\circ} \mathrm{C}\). The heat supplied during the constant volume combustion process is \(1200 \mathrm{~kJ} / \mathrm{kg}\). Determine the peak pressure and temperature, work output per \(\mathrm{kg}\) of air and air-standard efficiency. Assume \(c_{v}=\) \(0.718 \mathrm{~kJ} / \mathrm{kg} . \mathrm{K}\) and \(\gamma=1.4\) for air.