Question 30Motor Plants - Assistant Engineer

The correct answer is C) a combination of constant volume and constant pressure. Modern marine diesel engines equipped with mechanical fuel injection operate on a combustion cycle that is a combination of constant volume and constant pressure. This is because the initial compression of the air-fuel mixture occurs at constant volume, followed by the injection of fuel and the subsequent combustion, which occurs at constant pressure. This combination of constant volume and constant pressure is the fundamental principle underlying the operation of modern diesel engines. The other options are incorrect because: A) Diesel engines do not operate on a entirely constant volume combustion cycle. B) Diesel engines do not operate on a entirely constant pressure combustion cycle. D) The combustion cycle in diesel engines is not a combination of constant temperature and constant pressure.