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In rotating electrical machines, when the armature rotates, there are continuous magnetic reversals and power required for their reversals is called _____________

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In rotating electrical machines, when the armature rotates, there are continuous magnetic reversals and power required for their reversals is called _____________

(a) Eddy current loss

(b) Hysteresis loss

(c) Resistance or ohmic losses

(d) Mechanical loss

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Enquiry is from Losses and Efficiency topic in chapter Rating and Loss Dissipation of Electrical Machines

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The correct answer is (b) Hysteresis loss

To elaborate: Hysteresis loss is directly proportional to the number of magnetic reversals per second or the speed.

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