Synchronous Motor Multiple Choice Questions and Answers


31. In a synchronous motor, the forced vibrations will be maximum when driving


   A.A reciprocating air compressor

   B.A centrifugal pump

   C.A centrifugal blower

   D.Any of the above

   E.None of the above


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A.A reciprocating air compressor

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32. The angle between the rotor poles and stator poles, in a synchronous motor, is known as


   A.Power factor angle

   B.Torque angle

   C.Synchronizing angle

   D.Angle of retardation


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B.Torque angle

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33. In a synchronous machine in case the axis of field flux is in line with the armature flux, then


   A.The machines is working as synchronous generator

   B.The machines is working as synchronous motor

   C.The machines will vibrate violently

   D.None of the above


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D.None of the above

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34. The maximum torque which a synchronous motor will develop at rest for any angular position of the rotor, at rated stator supply voltage and frequency, is known as


   A.Locked-rotor torque

   B.Synchronous torque

   C.Pull up torque

   D.Reluctance torque


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A.Locked-rotor torque

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35. If one-phase of a 3-phase synchronous motor is short-circuited, motor


   A.Will refuse to start

   B.Will overheat in spots

   C.Will not come upto speed

   D.Will fail to pull into step


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A.Will refuse to start

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