Question 439Electricity & Electronics - Assistant Engineer

The correct answer is C) increase to 61 Hz. The frequency of an AC generator is directly proportional to its rotational speed. If the generator speed increases from 1800 RPM to 1830 RPM, the frequency will increase proportionally from 60 Hz to 61 Hz. This is because the number of AC cycles generated per minute is equal to the rotational speed multiplied by the number of pole pairs in the generator. Since the number of pole pairs remains constant, the increase in rotational speed from 1800 RPM to 1830 RPM results in the frequency increasing from 60 Hz to 61 Hz. The other options are incorrect because: A) decreasing to 59 Hz would not be the correct frequency change, B) the frequency would not remain at 60 Hz with the increased speed, and D) increasing to 63 Hz would be an incorrect frequency change.