Alternator Multiple Choice Questions and Answers

11. An alternator is capable of delivering power at a particular efficiency. The frequency can be increased by

   A.Reversing the armature rotation

   B.Reversing the field polarity

   C.Increasing the current supplied to the field electromagnets

   D.Increasing the armature speed

12. Which harmonic will be totally eliminated in an alternator by using a fractional pitch of 4/5?

   A.Third

   B.Fifth

   C.Seventh

   D.Ninth

13. If an alternator is operating at leading power factor, then it can be concluded that

   A.The alternator is under-excited

   B.The alternator is over-excited

   C.The torque angle of the alternator has negative value

   D.The residual magnetism of the poles is zero

14. In an alternator the armature reaction is mainly influenced by

   A.The power factor of the load

   B.Short-circuit ratio

   C.Speed of the alternator

   D.Total current drawn

15. Regulation of an alternator supplying resistive or inductive load is

   A.Always negative

   B.Always positive

   C.Either of the above

   D.None of the above

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