Synchronous Motor Multiple Choice Questions and Answers


21. The duration of sudden short-circuit test on a synchronous motor is usually about


   A.One hour

   B.One minute

   C.One second

   D.None of the above


✔ View Answer


C.One second

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22. For power factor correction, synchronous motors operate at


   A.No load and greatly over-excited fields

   B.No load and under-excited fields

   C.Normal load with minimum excitation

   D.Normal load with zero excitation


✔ View Answer


A.No load and greatly over-excited fields

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23. The coupling angle or load angle of synchronous motor is defined as the angle between the


   A.Rotor and stator teeth

   B.Rotor and the stator poles of opposite polarity

   C.Rotor and the stator poles of same polarity

   D.None of the above


✔ View Answer


B.Rotor and the stator poles of opposite polarity

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24. A synchronous motor develops maximum power when load angle is


   A.450

   B.600

   C.900

   D.1200


✔ View Answer


C.900

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25. A synchronous motor which works on a leading power factor and does not drive a mechanical load is called as


   A.Static condenser

   B.Condenser

   C.Synchronous condenser

   D.None of the above


✔ View Answer


C.Synchronous condenser

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