Synchronous Motor Multiple Choice Questions and Answers


1. An important advantages of a synchronous motor over wound round induction motor is that


   A.Its power factor may be varied at will

   B.Its speed is independent of supply frequency

   C.Its speed may be controlled more easily

   D.None of the above


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A.Its power factor may be varied at will

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2. Which of the following methods is used to start a synchronous motor


   A.Damper winding

   B.Star-delta starter

   C.Damper winding in conjunction with star-delta starter

   D.Resistance starter in the armature circuit


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C.Damper winding in conjunction with star-delta starter

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3. When the rotor speed, in a synchronous machine, becomes more than the synchronous speed during hunting, the damper bars develop


   A.Inductor motor torque

   B.Induction generator torque

   C.Synchronous motor torque

   D.D.C. motor torque

   E.None of the above


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B.Induction generator torque

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4. Stability of a synchronous machine


   A.Decreases with increase in its excitation

   B.Increases with increase in its excitation

   C.Remains unaffected with increase in excitation

   D.Any of the above


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B.Increases with increase in its excitation

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5. Which of the following motors will be used in electric clocks


   A.D.C. shunt motor

   B.D.C. series motor

   C.A.C. induction motor

   D.A.C. synchronous motor


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D.A.C. synchronous motor

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