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Which one of the following motor is a 1-Φ AC motor?

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Which one of the following motor is a 1-Φ AC motor?

(a) Synchronous motor

(b) Series motor

(c) Shunt motor

(d) Capacitor run

I have been asked this question in an internship interview.

I'm obligated to ask this question of Power Rating Determination of Electric Motors for Different Applications topic in chapter Rating and Heating of Motors of Electric Drives

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Correct answer is (d) Capacitor run

The best I can explain: Capacitor run motor is a 1-Φ AC motor. The capacitor is used to provide a 90° phase difference between the currents of main and auxiliary winding.

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