Discussion
A single-phase induction motor whose starting capacitor has failed open circuit will
Answer: D
Correct answer: hum but fail to start, and burn out if left energised
Without the capacitor there is no phase displacement, so the field merely pulsates and the two component torques cancel at standstill. The machine sits still drawing locked-rotor current, which is five or six times rated, and the windings overheat within a minute or two unless the thermal protector opens.
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