एक IC इंजन चक्र के माध्य प्रभावी दबाव (mean effective pressure) को गणितीय रूप से इस प्रकार परिभाषित किया गया है:

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?