Question 106Electricity & Electronics - Assistant Engineer

The correct answer is B) energize the space heater circuit. When an alternator is to remain idle for even a few days, it is important to energize the space heater circuit to prevent condensation buildup inside the alternator. This helps maintain the integrity of the insulation and prevents potential damage to the windings and other components. Letting the alternator sit idle without the space heater circuit energized can lead to corrosion and deterioration over time. The other options are incorrect because: A) opening the equalizing bus disconnect switch is not necessary for an idle alternator, C) insulating the collector rings is not the proper way to maintain an idle alternator, and D) lifting the brushes and disconnecting the pigtails is also not the recommended procedure for an alternator that will be idle for a short period.