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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23. The percentage slip in case of a synchronous motor is
A.1%
B.100%
C.0.5%
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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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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