USCG Exam PracticeElectrical basics — generators, motors, and safety
What instrumentation is required by regulation for an AC generator rated at 50 volts or more that is in operation?
- A. A voltmeter and an ammeter only
- ✓ A voltmeter, an ammeter, and a means for measuring frequencyCorrect
- C. A frequency meter and a power factor meter only
- D. An ammeter and a wattmeter only
Why B is correct
46 CFR §183.320(c) requires a voltmeter and an ammeter for any generator rated at 50 volts or more, and additionally requires a means for measuring frequency for each alternating current generator. A DC generator would not require the frequency measurement.
Cited:46 CFR §183.320