Question 50Motor Plants - Assistant Engineer
70% to passInjection pressure in a common rail fuel system is controlled by _______________.
Aengine speed
Bvarying the fuel pump piston stroke
Cvarying the injector needle valve clearance
Da bypass valve
AI Explanation
The correct answer is D) a bypass valve. In a common rail fuel system, the injection pressure is controlled by a bypass valve. This valve regulates the pressure in the common rail by allowing excess fuel to bypass the high-pressure fuel pump, thereby maintaining the desired injection pressure. This is done independently of engine speed (option A) or the fuel pump piston stroke (option B). The injector needle valve clearance (option C) determines the amount of fuel injected, but does not directly control the injection pressure.
Related Questions
Q@q.QuestionNumber:Starting systems for large, direct reversing, main propulsion diesel engines are... Q@q.QuestionNumber:What is the normal bearing clearance permitted at the horizontal axis of the sha... Q@q.QuestionNumber:The device shown in the illustration is classified as a/an _______________. Illu... Q@q.QuestionNumber:On the cylinder indicator diagram illustrated, the maximum rise in pressure occu... Q@q.QuestionNumber:A water jacket is placed around the exhaust manifolds of propulsion diesel engin...
Ready to test your knowledge?
Take a Motor Plants - Assistant Engineer Practice ExamOfficial Resources
Want to practice with timed exams?
Download Coast Guard Exams for the full exam experience.
Get the App