Question 68Electricity & Electronics - QMED

The correct answer is C) voltage regulator. As the electric load and power factor vary, the generator armature reaction changes. The voltage regulator compensates for these changes in armature reaction by adjusting the generator's field current to maintain a constant output voltage. The other options are incorrect because: A) A phase-balance relay is used to detect and respond to phase imbalances, not changes in armature reaction. B) The governor speed droop setting is used to control the generator's speed and frequency, not its voltage. D) A balance coil is used to compensate for changes in the generator's magnetic field, not armature reaction.