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What is the displacement of the running and the starting windings used?

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What is the displacement of the running and the starting windings used?

(a) running winding displaces the starting winding by 180°

(b) running winding displaces the starting winding by 90°

(c) starting winding displaces the running winding by 90°

(d) starting winding displaces the running winding by 180°

The question was asked in a job interview.

My question is taken from Types of Motor topic in portion Design of Single Phase Induction Motor of Design of Electrical Machines

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The correct option is (b) running winding displaces the starting winding by 90°

Best explanation: The split phase starting makes use of the starting windings along with the running windings. The running winding displaces the starting windings by 900.

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