The following data refers to a single cylinder 4 strokes petrol engine. Cylinder diameter (=30) (mathrm{cm}), piston

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The following data refers to a single cylinder 4 strokes petrol engine. Cylinder diameter \(=30\) \(\mathrm{cm}\), piston stroke \(=40 \mathrm{~cm}\), engine speed \(=1,400\) rpm, indicated mean effective pressure \(=5\) bar, fuel consumption \(=17.568 \mathrm{~kg} / \mathrm{h}\), calorific value of the fuel is \(45,000 \mathrm{~kJ} / \mathrm{kg}\); specific gravity of the fuel is 0.8 . Determine the indicated thermal efficiency.

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