Question 268Electricity/Electronics - Assistant Engineer70% to pass
Emergency generators are required to automatically start upon a loss of normal supply voltage, according to 46 CFR, Subchapter J (Electrical Engineering). In conducting a test of the emergency generator automatic transfer of load function, if the normal system supply voltage is 480 VAC, to what value would the normal source output voltage have to rise to trigger the automatic transfer of emergency loads back to the normal power source?
AI Explanation
The correct answer is C) It would have to rise to a value from between 408 VAC to 456 VAC.
The explanation is as follows:
According to 46 CFR, Subchapter J (Electrical Engineering), the emergency generator is required to automatically start and transfer the emergency loads when the normal power source voltage drops below a set value, typically between 408 VAC to 456 VAC for a 480 VAC system. This range allows for some voltage fluctuation while ensuring the emergency generator is activated to maintain critical systems. The other options are incorrect because they either fall outside the acceptable voltage range (A and D) or do not provide the necessary details (B).
Related Questions
#266 According to 46 CFR, Subchapter J (Electrical Engineering), which of the following starting aids is the ONLY method allowed to ease the starting of emergency diesel-generator engines? #267 According to 46 CFR, Subchapter J (Electrical Engineering), emergency diesel engine starting systems are required to have sufficient capacity to provide power for at least how many consecutive starts? #269 As shown in figure "A" of the illustration, what phenomenon is illustrated with respect to electrical cables and ground? Illustration EL-0126 #270 When a megohmmeter is used to test insulation, what condition causes the gradual rise of the pointer reading as a result of continued cranking? #271 Which of the listed pairs of materials make the best insulators?