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


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A.The motor stops

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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


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D.Power factor corrections

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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


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D.Armature current

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14. An over-excited synchronous motor takes


   A.Leading current

   B.Lagging current

   C.Both (a) and (b)

   D.None of the above


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A.Leading current

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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 Eb

   B.Increase in Eb but decrease in Ia

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

   D.Increase in both Ia and SYMBOL


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D.Increase in both Ia and SYMBOL

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