A four-cylinder, four stroke cycle petrol engine has (100 mathrm{~mm}) bore and stroke is 1.25 times the

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A four-cylinder, four stroke cycle petrol engine has \(100 \mathrm{~mm}\) bore and stroke is 1.25 times the bore. It consumes \(4 \mathrm{~kg}\) of fuel per hour having a calorific value of \(41,000 \mathrm{~kJ} / \mathrm{kg}\). The engine speed is \(800 \mathrm{rpm}\). Calculate indicated thermal efficiency if indicated mean effective pressure is \(0.75 \mathrm{MPa}\).

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