What do low-speed generators require more of compared to high-speed generators to provide power at the same frequency?

What do low-speed generators require more of compared to high-speed generators to provide power at the same frequency?

• A. More transformers
• B. More pairs of commutators
• C. More pairs of poles
• D. More pairs of armatures

Answer: (C)

Low-speed generators require more pairs of poles compared to high-speed generators to provide power at the same frequency due to the relationship between speed, frequency, and the number of poles in the generator. The frequency of the generated electrical power is determined by the formula: \[ \text{Frequency (Hz)} = \frac{\text{Number of Poles} \times \text{Speed (RPM)}}{120} \] To maintain the same frequency while operating at lower speeds, it is necessary to increase the number of poles. More poles enable the generator to produce the required output frequency without needing to increase its rotational speed, which is not feasible in low-speed applications. Therefore, by increasing the pairs of poles, a low-speed generator can effectively reach the same electrical output characteristics as its higher-speed counterpart, ensuring efficiency and functionality according to design requirements.

Low-speed generators require more pairs of poles compared to high-speed generators to provide power at the same frequency due to the relationship between speed, frequency, and the number of poles in the generator.

The frequency of the generated electrical power is determined by the formula:

[ \text{Frequency (Hz)} = \frac{\text{Number of Poles} \times \text{Speed (RPM)}}{120} ]

To maintain the same frequency while operating at lower speeds, it is necessary to increase the number of poles. More poles enable the generator to produce the required output frequency without needing to increase its rotational speed, which is not feasible in low-speed applications. Therefore, by increasing the pairs of poles, a low-speed generator can effectively reach the same electrical output characteristics as its higher-speed counterpart, ensuring efficiency and functionality according to design requirements.