Electrician Red Seal · Question
The synchronous speed of a 2-pole, 60 Hz AC motor is:
Synchronous speed (Ns) is calculated using the formula Ns = (120 * Frequency) / Number of Poles. For a 2-pole, 60 Hz motor, Ns = (120 * 60) / 2 = 7200 / 2 = 360
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Question: The synchronous speed of a 2-pole, 60 Hz AC motor is:
Answer options:
- 1800 revolutions per minute (rpm). ✅ 3600 revolutions per minute (rpm).
- 1200 revolutions per minute (rpm).
- 900 revolutions per minute (rpm).
Correct answer: 3600 revolutions per minute (rpm).
Explanation: Synchronous speed (Ns) is calculated using the formula Ns = (120 * Frequency) / Number of Poles. For a 2-pole, 60 Hz motor, Ns = (120 * 60) / 2 = 7200 / 2 = 3600 rpm.
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