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


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C.Excitation winding gets disconnected

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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


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B.Phase advancer

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


   A.1%

   B.100%

   C.0.5%

   D.Zero


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D.Zero

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24. The shaft of synchronous motor is made of


   A.Mild steel

   B.Chrome steel

   C.Alnico

   D.Stainless steel


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A.Mild steel

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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


✔ View Answer


B.When load varies

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