The hunting of a diesel engine may be caused by which of the following?
• Diesel engine hunting (cyclic speeding up and slowing down) and what typically causes unstable speed control • How a governor maintains engine speed, including the idea of sensitivity or control strength • Difference between a steady external change in load or fuel quality vs an internal control system that over-corrects
• Ask yourself: Does hunting look more like a random problem, or a regular back‑and‑forth oscillation caused by the speed control trying too hard? • Which option describes a condition that would make the governor keep overshooting the target speed instead of settling smoothly? • Which conditions would more likely change the average speed or power, rather than cause continuous oscillation around the set speed?
• Be clear on what engine hunting means: repeated overspeed/underspeed around the set RPM, not just one-time speed change. • Decide which choice most directly affects the stability of the governor’s speed control loop rather than just fuel quality or external load. • Check which answer describes the governor being too aggressive vs too weak, and which of those is more likely to cause repeated oscillations.
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