Question 40Motor Plants - Assistant Engineer70% to pass
The ratio of the brake horsepower to the indicated horsepower of a diesel engine is its_______________.
AI Explanation
The correct answer is B) mechanical efficiency.
The mechanical efficiency of a diesel engine is the ratio of the brake horsepower (the power available at the engine's output shaft) to the indicated horsepower (the power generated within the engine's cylinders). This ratio represents the proportion of the engine's indicated power that is actually delivered as useful work, accounting for mechanical losses such as friction and drag within the engine.
The other options are incorrect because:
A) Thermal efficiency is the ratio of the engine's useful work output to the total energy input.
C) Brake thermal efficiency is the ratio of the engine's brake horsepower to the total energy input.
D) Volumetric efficiency is the ratio of the actual volume of air/fuel mixture drawn into the engine's cylinders to the theoretical maximum volume.
Related Questions
#38 The theoretical minimum compression ratio necessary to ensure compression ignition in a direct injection diesel engine is_______________. #39 Which of the following relationships exist between the temperature developed in a combustion space, and the compression ratio of the engine? #41 The most important factor in engine performance is the actual power output at the end of the crankshaft available for doing work. This is known as_______________.#42 The average pressure exerted on a piston during each power stroke is termed_______________.#43 Most practical diesel engines today operate on a cycle which is a combination of the Diesel and Otto cycles. In this process, compression ignition _______________.