Synchronous Motor Multiple Choice Questions and Answers

16. A synchronous motor can be started by

   A.Pony Motor

   B.D.C. compound winding

   C.Providing damper winding

   D.None of the above

.

17. Mostly, synchronous motors are of

   A.Alternator type machines

   B.Induction type machines

   C.Salient pole type machines

   D.Smooth cylindrical type machines

18. A synchronous machine is called a doubly excited machine because

   A.It can be overexcited

   B.It has two sets of rotor poles

   C.Both its rotor and sator are excited

   D.It needs twice the normal exciting current

19. The power development by a synchronous motor will be maximum when the load angle is

   A.Zero

   B.45⁰

   C.90⁰

   D.120⁰

20. Synchronous motor always runs at

   A.The synchronous speed

   B.Less than synchronous speed

   C.More than synchronous speed

   D.None of the above

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