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.
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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
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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
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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
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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
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