Synchronous Motor Multiple Choice Questions and Answers


11. Due to which of the following reasons a synchronous motor fails to pull into synchronism after applying D.C. field current


   A.High field current

   B.Low short circuited ratio

   C.High core losses

   D.Low field current


✔ View Answer


D.Low field current

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12. The maximum speed variation in a 3-phase synchronous motor is


   A.10 percent

   B.60 percent

   C.4 percent

   D.2 percent

   E.Zero


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E.Zero

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13. Which of the following resistances can be measured by conducting insulation resistance test on a synchronous motor


   A.Phase to phase winding resistance

   B.Stator winding to earthed frame

   C.Rotor winding to earthed shaft

   D.All of the above


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D.All of the above

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14. If the field circuit of an unloaded salient pole synchronous motor gets suddenly open-circuited, then


   A.It runs at a slower speed

   B.The motor stops

   C.It continues to run at the same speed

   D.It runs at a very high speed


✔ View Answer


B.The motor stops

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15. The net armature voltage of a synchronous motor is equal to the


   A.Vector sum of Eb and V

   B.Airthmetic sum of Eb and V

   C.Airthmetic difference of Eb and V

   D.Vector difference of Eb and V


✔ View Answer


D.Vector difference of Eb and V

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