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When a single-phase winding is excited by an alternating current, then which of the following statements are correct?

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When a single-phase winding is excited by an alternating current, then which of the following statements are correct?

(a) It produces one stationary MMF wave

(b) Produced MMF wave pulsates along its magnetic axis

(c) It doesn’t produce two counter rotating MMF wave

(d) All of the mentioned

I had been asked this question during a job interview.

This intriguing question originated from Rotating Magnetic Field topic in portion Basic Concepts in Rotating Machines of Electrical Machines

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Correct option is (d) All of the mentioned

To elaborate: It is the decomposition of the MMF of a single phase winding into two counter rotating MMF waves, but are not actually produced and only one stationary MMF wave pulsating along its magnetic axis is produced.

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