Subtopic: I.C. engine systems – fuel, cooling, lubrication, ignition, electrical, intake and exhaust
Question Statement:
In an in-line diesel fuel injection jerk pump, the quantity of fuel delivered per stroke is modulated by:
Options:
(A) Rotating the pump plunger so that its helical groove aligns with the spill port earlier or later to terminate effective stroke
(B) Varying the camshaft lift profile dynamically
(C) Changing the nozzle hole diameter
(D) Adjusting the engine intake valve clearance
Answer Key:
A
Step-by-Step Solution & Explanation
A control rack rotates the plunger via a pinion; the helix angle determines the plunger travel before the spill port is uncovered, ending fuel delivery.