Synchronous Motor Multiple Choice Questions and Answers


26. The maximum value of torque that a synchronous motor can develop without losing its synchronism, is known as


   A.Slip torque

   B.Pull-out torque

   C.Breaking torque

   D.Synchronous torque


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D.Synchronous torque

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27. At no-load, the armature current in a synchronous motor


   A.In Zero

   B.Lags the applied voltage by 900

   C.Leads the applied voltage by 900

   D.Is in phase with the applied voltage

   E.None of the above


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C.Leads the applied voltage by 900

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28. In a synchronous motor, the breakdown torque is


   A.Directly proportional to applied voltage

   B.Directly proportional to the square of the applied voltage

   C.Inversely proportional to applied voltage

   D.None of the above


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A.Directly proportional to applied voltage

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29. Exciters of synchronous machines are


   A.D.C. shunt machines

   B.D.C. series machines

   C.D.C. compound machines

   D.Any of the above


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A.D.C. shunt machines

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30. If the synchronous motor, properly synchronised to the supply is running on no load and is having negligible loss then


   A.The stator current will be zero

   B.The stator current will be very small

   C.The stator current will be very high

   D.The back e.m.f. will be more than the supply voltage

   E.None of the above


✔ View Answer


A.The stator current will be zero

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