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The hysteresis loss in a DC machine least depends on _____________

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The hysteresis loss in a DC machine least depends on _____________

(a) Frequency of magnetic reversals

(b) Maximum value of flux density

(c) Volume and grade of iron

(d) Rate of flow of ventilating air

The question was posed to me in an interview for job.

My doubt is from Efficiency of DC Machine- 1 in section Efficiency and Testing of DC Machines

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Correct option is (d) Rate of flow of ventilating air

The best explanation: As iron core of the armature is rotating in magnetic field, some losses occurs in the core which is called core losses. These losses are categorized as Hysteresis loss and Eddy current loss. They depend on all quantities listed above.

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