QuestionJuly 23, 2025

The greater the number of poles, A It makes the motor more efficient. B the higher the rpm. C It does not make a difference on motor speed. D the lower the rpm.

The greater the number of poles, A It makes the motor more efficient. B the higher the rpm. C It does not make a difference on motor speed. D the lower the rpm.
The greater the number of poles,
A It makes the motor more efficient.
B the higher the rpm.
C It does not make a difference on motor speed.
D the lower the rpm.

Solution
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Answer

D the lower the rpm. Explanation 1. Understand Motor Poles and RPM Relationship The number of poles in a motor affects its synchronous speed. **Synchronous speed** is calculated using the formula N_s = \frac{120 \times f}{P}, where N_s is the synchronous speed in RPM, f is the frequency in Hz, and P is the number of poles. 2. Analyze the Formula Increasing the number of poles (P) decreases the synchronous speed (N_s), as they are inversely related.

Explanation

1. Understand Motor Poles and RPM Relationship<br /> The number of poles in a motor affects its synchronous speed. **Synchronous speed** is calculated using the formula $N_s = \frac{120 \times f}{P}$, where $N_s$ is the synchronous speed in RPM, $f$ is the frequency in Hz, and $P$ is the number of poles.<br /><br />2. Analyze the Formula<br /> Increasing the number of poles ($P$) decreases the synchronous speed ($N_s$), as they are inversely related.
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