Question 386Electricity & Electronics - Assistant Engineer

The correct answer is A) main AC generator. The switchboard instrumentation panel shown in the illustration EL-0040 is best suited for monitoring and controlling a main AC generator, as it provides the necessary instrumentation and controls for the operation of an AC generator, such as voltage, current, and frequency indicators. The other options are not correct because B) a main DC generator would have different instrumentation requirements, C) an electric arc welder controller would have specialized controls not found on this panel, and D) a variable frequency MG set is a different type of electrical system that would require a different control panel configuration.