Discussion
A compound generator has
Answer: C
Correct answer: both a series and a shunt field winding
A compound machine carries a shunt field of many fine turns across the armature and a series field of few heavy turns in the load circuit. The shunt field sets the no-load voltage and the series field responds to load current, so the two together shape the external characteristic. Connecting the series field to assist gives a cumulative machine whose voltage is held up or even raised with load; connecting it to oppose gives a differential machine whose voltage falls steeply.
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