Alternator Multiple Choice Questions and Answers

6. In an alternator field the effect of cross-magnetisation is to make the output

   A.Non-sinusoidal

   B.True sinusoidal

   C.Free from harmonics

   D.None of the above

7. When two alternators are running in exact synchronism, the scychronising power will be

   A.Unity

   B.Zero

   C.Sum of the output of two

   D.None of the above

8. The power factor of an alternator is determined by its

   A.Excitation

   B.Speed

   C.Primemover

   D.None of the above

9. If two alternators are running in parallel and the excitation of one of the alternators is increased, then

   A.Power output will decrease

   B.Wattless component will change

   C.Machine with excess excitation will burn

   D.Both machines will start vibrating

   E.None of the above

10. When an alternator is supplying unity power factor load, the armature reaction will produce

   A.Distortion of the main field

   B.Magnetisation of the main field

   C.Demagnetisation of the main field

   D.None of the above

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