Alternator Multiple Choice Questions and Answers


21. In an alternator terminal voltage rise will be more


   A.When leading load is thrown off

   B.When lagging load is thrown off

   C.When unity power factor load is thrown off

   D.None of the above

.


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B.When lagging load is thrown off

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22. Alternator of a central power station will have


   A.Revolving field winding

   B.Revolving armature winding

   C.Either of the above

   D.None of the above


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A.Revolving field winding

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23. If the input to the primemover of an alternator is kept constant but the excitation is increased, then


   A.kVA will be lagging

   B.>kVA will be leading

   C.>kVA will be changed

   D.The power factor of the load remains constant


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A.kVA will be lagging

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24. Regulation of an alternator supplying leading load is


   A.Always negative

   B.Always positive

   C.Sometimes positive and sometimes negative depending upon load and power factor


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C.Sometimes positive and sometimes negative depending upon load and power factor

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25. In power generating stations (Thermal stations), the usual number of poles employed in alternators are


   A.Tweenty four

   B.Thirty two

   C.Forty eight

   D.None of the above


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D.None of the above

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