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In case of the 3 phase winding with delta or star connection without neutral, if one of the supply lines gets disconnected, then the MMF becomes __________

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In case of the 3 phase winding with delta or star connection without neutral, if one of the supply lines gets disconnected, then the MMF becomes __________

(a) Stationary and pulsating

(b) Rotating with synchronous speed

(c) Rotating with sub synchronous speed

(d) Rotating with super synchronous speed

I have been asked this question in an internship interview.

I need to ask this question from Rotating Magnetic Field in chapter Basic Concepts in Rotating Machines of Electrical Machines

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Correct option is (a) Stationary and pulsating

To explain: Disconnection of one of the supply leads, results in single-phase operation of the machine.

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