Synchronous Motor Multiple Choice Questions and Answers


1. The direction of rotation of a synchronous motor can be reversed by reversing


   A.Current to the field winding

   B.Supply phase sequence

   C.Polarity of rotor poles

   D.None of the above


✔ View Answer


B.Supply phase sequence

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2. In a synchronous motor, the magnitude of stator back e.m.f. Eb depends on


   A.Speed of the motor

   B.Load of the motor

   C.Both the speed and rotor flux

   D.D.C. excitation only


✔ View Answer


D.D.C. excitation only

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3. The maximum value of torque angle a in a synchronous motor is .......... degrees electrical


   A.45

   B.90

   C.Between 45 and 90

   D.Below 60


✔ View Answer


B.90

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4. If the field of a synchronous motor is under excited, the power factor will be


   A.Lagging

   B.Leading

   C.Unity

   D.More than unity


✔ View Answer


A.Lagging

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5. The V-curves of a synchronous motor show relationship between


   A.Excitation current and back e.m.f

   B.Field current and p.f.

   C.D.C. field current and A.C. armature current

   D.Armature current and supply voltage


✔ View Answer


C.D.C. field current and A.C. armature current

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