A gas engine working on four-stroke cycle has a cylinder of \(250 \mathrm{~mm}\) diameter, length of stroke \(450 \mathrm{~mm}\) and is running at \(180 \mathrm{rpm}\). Its mechanical efficiency is \(80 \%\); mean effective pressure is \(0.65 \mathrm{MPa}\), Find: (i) indicated power, (ii) brake power, and (iii) friction power.