Discussion
Assertion (A): A generator's excitation controls its reactive rather than its active power.
Reason (R): Active power is set by the prime mover torque.
Select the correct option.
Answer: D
On a network the speed is fixed, so the torque the prime mover applies fixes the power, and the excitation is left to determine the reactive exchange. The two controls are very nearly independent, which is what makes the machine so manageable.
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