MDE 5 Q4

Answer: C) By changing the position of the plunger within the pump cylinder
Explanation: In Bosch or Jerk type fuel injection pumps, the delivered quantity of fuel oil is controlled by varying the position of the plunger within the pump cylinder. This adjustment changes the volume of fuel drawn into the pump and subsequently delivered to the injector, thereby controlling the amount of fuel injected into the engine.

Answer: B) To prevent fuel leakage back into the pump after injection
Explanation: The delivery valve in Bosch or Jerk type fuel injection pumps prevents fuel from leaking back into the pump after it has been injected. It ensures that the injected fuel remains in the fuel lines and injector, maintaining proper pressure and volume for effective fuel delivery.