Load On Synchronous Motor Multiple Choice Questions and Answers


6. The effect of increasing load on a synchronous motor running with normal excitation is to


   A.Increase both its Ia and p.f.

   B.Decrease Ia but increase p.f.

   C.Increase Ia but decrease p.f.

   D.Decrease both its Ia and p.f.


✔ View Answer


C.Increase Ia but decrease p.f.

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7. When load on a synchronous motor is increased, its armature currents in increased provided it is


   A.Normally-excited

   B.Over-excited

   C.Under-excited

   D.All of the above


✔ View Answer


D.All of the above

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8. When load on a synchronous motor running with normal excitation is increased, armature current drawn by it increases because


   A.Back e.m.f. Eb becomes less than applied voltage V

   B.Power factor is decreased

   C.Net resultant voltage ER in armature is increased

   D.Motor speed is reduced


✔ View Answer


C.Net resultant voltage ER in armature is increased

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9. When running under no-load condition and with normal excitation, armature current Ia drawn by a synchronous motor


   A.Leads the back e.m.f.Eb by a small angle

   B.Is large

   C.Lags the applied voltage V by a small angle

   D.Lags the resultant voltage ER by 900


✔ View Answer


C.Lags the applied voltage V by a small angle

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10. When load on a normally-excited synchronous motor is increased, its power factor tends to


   A.Approach unity

   B.Becomes increasingly lagging

   C.Becomes increasingly leading

   D.Remain unchanged


✔ View Answer


B.Becomes increasingly lagging

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