Synchronous Motor Multiple Choice Questions and Answers

16. In a synchronous motor damper windings are provided on

   A.Stator frame

   B.Rotor shaft

   C.Poles faces

   D.None of the above

17. In a 3-phase synchronous motor, the negative phase sequence exists when the motor is

   A.Supplied with unbalanced voltage

   B.Under-loaded

   C.Over-loaded

   D.None of the above

18. The maximum constant load torque under which a synchronous motor will pull into synchronism at rated rotor supply voltage and frequency is known as

   A.Pull-up torque

   B.Pull-in torque

   C.Pull-out torque

   D.None of the above

19. Which of the following losses, in a synchronousmotor, does not vary with load

   A.Windage loss

   B.Copper losses

   C.Any of the above

   D.None of the above

20. The size of a synchronous motor decreases with the increase in

   A.Flux density

   B.Horse power rating

   C.Speed

   D.All of the above

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