Electrician Red Seal · Question
Which of the following is a key characteristic of a synchronous motor?
Synchronous motors operate at a constant speed, known as synchronous speed, which is directly proportional to the supply frequency and inversely proportional to
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Question: Which of the following is a key characteristic of a synchronous motor?
Answer options:
- It always operates at a leading power factor.
- Its rotor speed is always less than the synchronous speed. ✅ It operates at a constant speed regardless of load variations, assuming the supply frequency is constant.
- It requires brushes and a commutator for operation.
Correct answer: It operates at a constant speed regardless of load variations, assuming the supply frequency is constant.
Explanation: Synchronous motors operate at a constant speed, known as synchronous speed, which is directly proportional to the supply frequency and inversely proportional to the number of poles. This speed is maintained regardless of changes in load within its operating limits.
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