Synchronous Motor Multiple Choice Questions and Answers


26. A synchronous motor can be used as a synchronous capacitor when it is


   A.Under-loaded

   B.Over-loaded

   C.Under-excited

   D.Over-excited


✔ View Answer


D.Over-excited

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27. As the load is applied to synchronous motor, the motor takes more armature current because


   A.The increased load has to take more current

   B.The rotor by shifting its phase backward causes motor to take more current

   C.The back e.m.f. decreases causing an increase in motor current

   D.The rotor strengthens the rotating field causing more motor current


✔ View Answer


B.The rotor by shifting its phase backward causes motor to take more current

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28. Under which of the following conditions hunting of synchronous motor is likely to occur


   A.Periodic variation of load

   B.Over-excitation

   C.Over-loading for long periods

   D.Small and constant load


✔ View Answer


A.Periodic variation of load

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29. The oscillations in a synchronous motor can be damped out by


   A.Maintaining constant excitation

   B.Running the motor on leading power factors

   C.Providing damper bars in the rotor poles faces

   D.Oscillations cannot be damped


✔ View Answer


C.Providing damper bars in the rotor poles faces

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30. A synchronous machine with large air gap has


   A.A higher value of stability limit

   B.A small value of inherent regulation

   C.A higher synchronizing power which makes the machine less sensitive to load variations

   D.All of the above


✔ View Answer


D.All of the above

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