Discussion
The excitation of a synchronous motor is often controlled automatically to
Answer: B
Correct answer: hold the power factor at a set value
The excitation controls reactive power, so an automatic regulator adjusts the field current to hold the power factor, or the reactive output, at whatever the network requires as the real load varies. Speed is fixed by the supply frequency and cannot be influenced by the field; the torque follows the mechanical load; and holding the torque angle at 90 degrees would place the machine exactly at its stability limit, which is the last thing a regulator should do.
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