Q.

When a synchronous motor is started, the field winding is energized 

  • AIn the very beginning
  • BWhen the motor attains a speed slightly less than the synchronous speed
  • CAfter the motor has attained the synchronous speed and synchronized 
  • DAny time
Correct Answer : (B)

When the motor attains a speed slightly less than the synchronous speed

Hints :

When a synchronous motor is started, the field winding is energized When the motor attains a speed slightly less than the synchronous speed.

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