Synchronous Motor Multiple Choice Questions and Answers

21. A synchronous motor will always stop when

   A.Supply voltage fluctuates

   B.Load in motor varies

   C.Excitation winding gets disconnected

   D.Supply voltage frequency changes

22. A synchronous motor working at leading power factor can be used as

   A.Voltage booster

   B.Phase advancer

   C.Noise generator

   D.Mechanical synchronizer

23. The percentage slip in case of a synchronous motor is

   A.1%

   B.100%

   C.0.5%

   D.Zero

24. The shaft of synchronous motor is made of

   A.Mild steel

   B.Chrome steel

   C.Alnico

   D.Stainless steel

25. Hunting in a synchronous motor takes place

   A.When supply voltage fluctuates

   B.When load varies

   C.When power factor is unity

   D.Motor is under loaded

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