Which of the following term is not associated with synchronous motor:
- Doubly fed
- Constant speed
- Single fed
- Variable PF motor
Correct answer: 3. Single fed
Explanation: A synchronous motor is a doubly-fed variable PF motor, that runs at constant synchronous speed. The term single fed means we are providing only a single supply and no external supply is provided for excitation purposes. However, this is not the case.
So 3. Single fed is the correct answer