Alternator Multiple Choice Questions and Answers

26. In order to reduce the harmonics in the e.m.f. generated in an alternator

   A.Winding is well distributed

   B.Slots are skewed

   C.Sailent pole tipes are chamfered

   D.All of the above

   E.None of the above

27. Salient pole type rotors as compared to cylindrical pole type are

   A.Small in diameter as well as axial length

   B.Large in diameter as well as axial length

   C.Smaller in diameter and larger in axial length

   D.Larger in diameter and smaller in axial length

28. Which of the following relays come into operation in the event of the failure of prime-mover connected to the generator

   A.Buchholz relay

   B.Reserve power relay

   C.All of the above

   D.None of the above

29. ....... plays an important role in overspeed protection of a generator

   A.Reserve power relay

   B.Differential protection

   C.Over current relay

   D.Alarm

30. In an alternator, the armature reaction influences

   A.Generated voltage per phase

   B.Waveform of voltage generated

   C.Operating speed

   D.Windage losses

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