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In the DC motor the iron losses occur in __________

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In the DC motor the iron losses occur in __________

(a) Field

(b) Rotor

(c) Brushes

(d) Commutator

I have been asked this question at a job interview.

My doubt is from Efficiency of DC Machine- 2 topic in section Efficiency and Testing of DC Machines

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The correct option is (b) Rotor

The explanation: Armature winding in a DC machine is located on rotor. Iron losses occur in an armature, hence in rotor. Iron losses are hysteresis loss and eddy current loss, which are seen prominently in armature rotor.

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