Question 100Electricity & Electronics - 1st Asst/Chief

The correct answer is C) increase to 61 Hz. The frequency of an AC generator is directly proportional to its rotational speed. When the generator speed increases from 1800 RPM to 1830 RPM, the frequency will increase proportionally. Since the original frequency was 60 Hz at 1800 RPM, increasing the speed to 1830 RPM will increase the frequency to 61 Hz. The other options are incorrect because: A) decreasing to 59 Hz would not be proportional to the speed increase, B) remaining at 60 Hz would not be correct since the speed has increased, and D) increasing to 63 Hz would be disproportionate to the 30 RPM speed increase.