A synchronous motor can develop synchronous torque
A. when under loaded
B. while over-excited
C. only at synchronous speed
D. below or above synchronous speed
Answer:C
A synchronous motor can develop synchronous torque
A. when under loaded B. while over-excited C. only at synchronous speed D. below or above synchronous speed
Explanation: Synchronous motors are inherently not able to self-start on an AC power source with the utility frequency of 50 or 60 Hz. his is because synchronous motors can develop a torque only when running at the synchronous speed.