Question 462Electricity & Electronics - Assistant Engineer

The correct answer is C) Reference electrode voltage. In a properly operating electronically regulated impressed current cathodic hull protection system, the reference electrode voltage should remain constant. The reference electrode is used to monitor the potential difference between the hull and the surrounding seawater, which indicates the level of cathodic protection. The control system adjusts the anode current to maintain this reference voltage at the desired level, ensuring adequate protection without over-protecting the hull. The other options are incorrect because they can vary to maintain the constant reference voltage. The control amplifier output voltage and individual anode currents may change to adjust the total anode current, and the total anode current itself can also fluctuate to keep the reference voltage stable.