Discussion
Which quantity does the regulator actually control?
Answer: A
Reducing field current weakens the magnetic field and lowers the output voltage, which is the only control the regulator has. Output current is not limited directly; the machine is designed so that it cannot exceed its rating. Checking which component actually carries the load settles most questions of this kind at once. Reading the definition literally, rather than recalling a summary, avoids the usual confusion. Most errors here come from carrying a result across from a neighbouring case where it does not hold.
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