Regarding an AC generator connected to the main electrical bus; as the electric load and power factor vary, a corresponding change is reflected in the generator armature reaction. How are these changes in armature reaction compensated for?

Correct Answer: Option C — voltage regulator

Automatic voltage regulators sense terminal voltage variations caused by armature reaction and adjust exciter field current accordingly. Per IEEE 45 and 46 CFR Subchapter J, this maintains constant bus voltage despite fluctuating reactive loads and power factor changes.