Discussion
The prime mover of a dc generator supplies
Answer: C
Correct answer: the electrical output plus all the machine’s losses
The prime mover supplies the whole mechanical input, which must cover the electrical output delivered to the load together with the iron loss, the friction and windage, the armature and field copper losses and the brush contact loss. The ratio of output to that input is the efficiency. It is a useful check on any efficiency calculation that the input must always exceed the output.
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