Discussion
Which of these is NOT a way of controlling the speed of an induction motor?
Answer: C
Correct answer: Varying the armature resistance of the machine
An induction motor has no armature - that is a dc machine term, and the corresponding induction motor method is rotor resistance control, which works only on a wound rotor machine. Stator voltage variation, pole changing and frequency variation are all genuine methods, the last being the one that has displaced the others.
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