Discussion
Hunting of a synchronous motor is set off by
Answer: C
Correct answer: a sudden change of load or of supply
The rotor sits at a load angle determined by the load, and a sudden change moves the equilibrium point. The rotor swings towards the new angle, overshoots because of its inertia, and oscillates about it. The damper winding dissipates that oscillation; without it, or with a periodic disturbance near the natural frequency, hunting can build up until synchronism is lost.
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