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
Q331:One of the factors limiting the amount of load which can be put on a modern mari... Q323:The section of the turbocharger which would be connected to the aftercooler inle... Q84:In a diesel engine, after ignition of the fuel occurs, but before the piston rea... Q367:Which operating parameter may need to be decreased when running a large main pro... Q92:A diesel engine operating at a light load, when compared to operating at heavy l...
Ready to test your knowledge?
Take a Motor Plants - Assistant Engineer Practice ExamOfficial Resources