Question 479Electricity & Electronics - QMED

The correct answer is D) exceeding nameplate currents shortens useful life. Engine room watchstanders need to closely monitor the loads on electric motors to ensure they do not exceed the motor's nameplate current ratings. Operating motors at loads beyond their design specifications can overheat the windings and insulation, which shortens the useful life of the motor. This is a key consideration for maintaining the safety and reliability of the vessel's electrical systems. The other answer choices are incorrect, as they do not directly address the critical importance of not exceeding a motor's rated capacity.