Engine: Electricity

1. A The synchronous motor initially starts as a synchronous motor and when it approaches synchronous speed, the motor continues to run as a synchronous motor.
2. B The synchronous motor initially starts as a synchronous motor and when it approaches synchronous speed, the motor then runs as an induction motor.
3. C The synchronous motor initially starts as an induction motor and when it approaches synchronous speed, the motor continues to run as an induction motor.
4. D The synchronous motor initially starts as an induction motor and when it approaches synchronous speed, the motor then runs as a synchronous motor.

Tip: press A-D to answer