An Otto cycle is conducted as follows. Air at 100 kPa and 20^oC is compressed reversibly and adiabatically. The air is then heated at constant volume to 1500^oC. The air then expands reversibly and adiabatically back to the original volume and is cooled at constant volume back to the original pressure and temperature. The volume compression ratio is 8. Calculate the following.

i. The thermal efficiency.

ii. The heat input per kg of air.

iii. The net work output per kg of air.

iv. The maximum cycle pressure.

Cv = 718 kJ/kg

= 1.4.

R = 287 J/kg K