Discussion
True or false: a synchronous motor's speed falls as its load is increased.
Answer: D
Correct answer: False, since the speed is locked rigidly to the supply frequency
The rotor is locked to the revolving field, so it turns at exactly \( 120f/P \) at every load up to the pull-out point. What changes with load is the angle at which it sits behind the field, not its speed - and beyond pull-out it does not slow down but falls out of step altogether.
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