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


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C.Much higher than that of a power transformer

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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


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D.As a return path for the flux

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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


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B.The unsaturated synchronous impedance

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


   A.Fictitious impedance

   B.Fictitious conductance

   C.Fictitious reactance

   D.Fictitiouse resistance


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C.Fictitious reactance

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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.


✔ View Answer


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

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