Discussion
A brushless exciter for a synchronous generator consists of
Answer: D
Correct answer: a shaft-mounted alternator feeding rotating rectifiers
The brushless exciter is an inside-out alternator on the same shaft: its field is stationary and its armature rotates, so the ac it generates is already on the rotor and is rectified there by diodes turning with the shaft. Nothing has to cross from the stationary frame, which removes the brushes and the maintenance they demand.
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