Alternator Multiple Choice Questions and Answers

41. In an alternator zero power factor method is used to find the

   A.Synchronous impedance

   B.Efficiency

   C.Armature resistance

   D.Voltage regulation

42. The advantage of sailent poles in an alternator is

   A.Reduced windage loss

   B.Reduced bearing loads and noise

   C.Reduced noise

   D.Adaptability of low and medium speed operation

43. Two alternators are to be put in parallel. Which of the following factors should be identical for both?

   A.Frequency

   B.Phase sequence

   C.Voltage

   D.All of the above

44. If two alternators are running in proper synchronism and the voltage of one machine is suddenly increased

   A.Both machines will stop

   B.One machines will stop

   C.Synchronising torque will be produced to restore further synchronism

   D.None of the above

45. Three-phase alternators are invariably star-connected because

   A.Higher terminal voltage is obtained

   B.Less turns of wire are required

   C.Small conductors can be used

   D.Magnetic losses are the minimum

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