Alternator Multiple Choice Questions and Answers

21. If the input to the prime mover of an alternator is kept constant but the excitation is changed then

   A.The power factor of the load remains constant

   B.The reactive component of the output is changed

   C.The active component of the output is changed

   D.None of the above

22. For the alternators operating in parallel, if the load shared by one of them is to be increased, its field excitation is

   A.To be weakened keeping input torque same

   B.To be strengthened keeping input torque same

   C.To be kept constant but input torque should be increased

   D.To be kept constant but input torque should be decreased

23. The power drwan by the prime-mover of an alternator, under no-load conditions, goes to

   A.Meet copper losses both in armature and rotor windings

   B.Produce power in armature

   C.Meet no-load losses

   D.Produce e.m.f. in armature winding

24. The regulation of an alternator is

   A.The increase in terminal voltage when load is thrown off

   B.The reduction in terminal voltage when alternator is loaded

   C.The variation of terminal voltage under the condition of maximum and minimum excitation

   D.The charge in terminal voltage from lagging power factor to leading power factor

   A.None of the above

25. Dirt accumulation in generators can cause

   A.Flashovers

   B.Overheating

   C.Poor voltage regulation

   D.All of the above

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