Discussion
In a DC machine, the hysteresis losses are covered under the category of ______ losses.
Answer: D
The losses in a DC machine are grouped as copper (electrical) losses, iron (core) losses, mechanical losses and brush losses. Hysteresis loss is the energy spent in turning the magnetic domains of the iron core round with each reversal of the flux seen by the armature core, and together with eddy current loss it forms the iron loss, also called the core loss.
Friction and windage are the mechanical losses, the \(I^2R\) loss in the windings is electrical, and brush losses come from the contact drop and brush friction. The answer is iron, option D.
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