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In a DC generator, the iron losses mainly take place in ____________

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In a DC generator, the iron losses mainly take place in ____________

(a) Yoke

(b) Commutator

(c) Armature conductors

(d) Armature rotor

I have been asked this question during an interview.

This question is from Efficiency of DC Machine- 2 topic in section Efficiency and Testing of DC Machines

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Right choice is (d) Armature rotor

Easy explanation: Iron losses take place in the form of hysteresis loss and eddy current loss. These losses are maximum, where field is maximum. Thus, when armature is rotated in presence of flux we get maximum iron loss.

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