Synchronous Motor Multiple Choice Questions and Answers


36. The minimum armature current of the synchronous motor corresponds to operation at


   A.Zero power factor leading

   B.Unity power factor

   C.0.707 power factor lagging

   D.0.707 power factor leading


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B.Unity power factor

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37. The maximum power developed in a synchronous motor occurs at a coupling angle of


   A.300

   B.600

   C.900

   D.1800


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C.900

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38. An electric motor in which both the rotor and stator fields rotates with the same speed is called aa/an ....... motor


   A.D.C.

   B.Charge

   C.Synchronous

   D.Universal


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C.Synchronous

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39. The angle between the synchronously-roating stator flux and rotor poles of a synchronous motor is called....... angle


   A.Synchronizing

   B.Torque

   C.Power factor

   D.Slip


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B.Torque

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40. The standard full-load power factor ratings for synchronous motors are


   A.Zero or 0.8 leading

   B.Unity or 0.8 lagging

   C.Unity or 0.8 leading

   D.Unity or zero


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C.Unity or 0.8 leading

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