Which of the following is not the advantage of a synchronous motor?

  • AOperating over a wide range of power factor from lagging to leading 
  • BIt can always be adjusted to operate at unity power for optimum efficiency and economy
  • CIts rotor has 2 slip rings
  • DOperation at constant speed from no load to pull load 
Correct Answer : (C)

Its rotor has 2 slip rings

Hints :

Synchronous motors generally have 


Number of slip rings in a 3-phase synchronous motor will be 

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