🔍 Key Concepts

• 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

💭 Think About

• 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?

✅ Before You Answer

• 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.