Alternator Multiple Choice Questions and Answers

16. Voltage regulation of an alternator is usually

   A.Equal to that of power transformer

   B.Much lower than that of a power transformer

   C.Much higher than that of a power transformer

17. In an alternator, the stator frame serves

   A.To verticate the armature

   B.To hold the armature stampings

   C.To protect the whole machine

   D.As a return path for the flux

18. In an alternator short-circuit current is limited by

   A.The saturated synchronous impedance

   B.The unsaturated synchronous impedance

   C.Either of the above

   D.None of the above

19. In an alternator, armature reaction is considered equivalent to

   A.Fictitious impedance

   B.Fictitious conductance

   C.Fictitious reactance

   D.Fictitiouse resistance

20. In an alternator short pitch coils are used

   A.To reduce the stray losses

   B.To reduce the size of the machine

   C.To provide accurate phase difference of 120⁰ between

   D.To reduce the harmonics in generated e.m.f.

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