A four-stroke single-cylinder engine produces 24 kW of power at the engine crankshaft at 2000 rpm. The mechanical efficiency of the engine is 80%, the swept volume is 800 cc, and the stroke length is 9 cm. What will be the indicated mean effective pressure of the engine?

A 40 kW engine has a mechanical efficiency of 80% at full rated load. If the frictional power is assumed to remain constant with load, what is the approximate value of the mechanical efficiency at 50% of the rated load?

A diesel engine develops a brake power of 4 kW. Its indicated thermal efficiency is 30% and mechanical efficiency is 80%. If the calorific value of the fuel is 42,000 kJ/kg, what will be the fuel consumption in kg/hr?