Question: Following data refers to a test on a petrol engine. Indicated power (=30 mathrm{~kW}), Brake power (=26) (mathrm{kW}), Engine speed (=1800 mathrm{RPM}), Brake specific fuel

Following data refers to a test on a petrol engine. Indicated power $=30 \mathrm{~kW}$, Brake power $=26$ $\mathrm{kW}$, Engine speed $=1800 \mathrm{RPM}$, Brake specific fuel consumption $=0.35 \mathrm{~kg} / \mathrm{kWh}, \mathrm{C} . \mathrm{V}$. of fuel $=$ $44,000 \mathrm{~kJ} / \mathrm{kg}$

Calculate : (1) $\eta_{\text {mech }}(2)\left(\eta_{\mathrm{th}}\right)_{i}(3)\left(\eta_{\mathrm{th}}\right)_{b}$.

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