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 lossI have been asked this question in quiz.Enquiry is from Losses and Efficiency topic in chapter Rating and Loss Dissipation of Electrical Machines

In rotating electrical machines, when the armature rotates, there are

1.	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 lossI have been asked this question in quiz.Enquiry is from Losses and Efficiency topic in chapter Rating and Loss Dissipation of Electrical Machines
Answer» 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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