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


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A.Stator frame

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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


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C.Over-loaded

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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


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B.Pull-in torque

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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


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A.Windage loss

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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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A.Flux density

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