An oil engine works on the Dual cycle, the heat liberated at constant pres- ure being twice that liberated at constant volume. The compression ratio of the engine is 8 and the expansion ratio is 5.3. But the compressio, expansion processes follow the law pvis C. The pressure and temper ature at the beginning of compression are 1 bar and 27 respectiv Assuming CP 1.004 kJ/kg K and Cu 0.717 kJ/kg K for air, find air-standard efficiency and the mean effective pressure.