Discussion
The rotational losses of a dc motor comprise
Answer: D
Correct answer: iron loss together with friction and windage
The rotational losses are those that depend on speed and flux rather than on load current: hysteresis and eddy current loss in the armature iron, bearing and brush friction, and windage. They are measured together in a no-load test and treated as constant, in contrast with the armature copper loss, which varies with the square of the current.
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