Excitation On Synchronous Motor Multiple Choice Questions and Answers

11. When the excitation of an unloaded salient pole synchronous motor suddenly gets disconnected

   A.The motor stops

   B.It runs as a reluctance motor at the same speed

   C.It runs as a reluctance motor at a lower speed

   D.None of the above

12. An over-excited synchronous motor is used for

   A.Fluctuating loads

   B.Variable speed loads/span>

   C.Low torque loads

   D.Power factor corrections

13. A synchronous motor running with normal excitation adjusts to load increases essentially by increase in its

   A.Power factor

   B.Torque angle

   C.Back e.m.f.

   D.Armature current

14. An over-excited synchronous motor takes

   A.Leading current

   B.Lagging current

   C.Both (a) and (b)

   D.None of the above

15. Ignoring the effects of armature reaction, if excitation of a synchronous motor running with constant load is decreased from its normal value, it leads to

   A.Increase in but decrease in E_b

   B.Increase in E_b but decrease in I_a

   C.Increase in both I_a and p.f. which is lagging

   D.Increase in both I_a and SYMBOL

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