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The speed at which rotating magnetic field revolves is called?

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The speed at which rotating magnetic field revolves is called?

(a) Induction speed

(b) Synchronous speed

(c) Relative speed

(d) Rotating speed

The question was posed to me in an online quiz.

I'm obligated to ask this question of Rotating Magnetic Field in chapter Basic Concepts in Rotating Machines of Electrical Machines

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The correct choice is (b) Synchronous speed

To elaborate: Rotating field speed (Ns) = 120f/(p r.p.m) = synchronous speed.

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