Question 508Electricity & Electronics - Assistant Engineer

The correct answer is C. When the ship's service generator on line fails, the emergency diesel-generator will automatically start and automatically supply power to the 450 VAC section of the emergency bus through the automatic bus transfer device. This is the standard operation for emergency power systems on ships, where the emergency generator is designed to take over the essential electrical loads in the event of a failure of the main power system. The other options are incorrect because: A) the emergency generator does not need to be manually started, B) it supplies power to the emergency bus, not the main bus, and D) the automatic bus transfer device does not need to be manually shifted to supply power from the emergency generator.