Alternator Multiple Choice Questions and Answers

31. A stationary alternator should not be connected to a live bus-bar because it

   A.Will get short-circuited

   B.Will disturb generated e.m.fs. of other alternators connected in parallel

   C.Is likely to run as a synchronous motor

   D.Will decrease but-bar voltage though momentarily

   E.None of the above

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

   A.Primemover

   B.Excitation

   C.Speed

   D.Load

33. An alternator is said to be over excited when it is operating at

   A.Lagging power factor

   B.Leading power factor

   C.Unity power factor

   D.Lagging to leading power factor

   E.Any of the above

34. An alternator driven by a Francis hydraulic turbine is a ........ alternator

   A.Low speed

   B.Medium speed

   C.High speed

   D.Low or medium speed

35. If steam supply of an alternator running in parallel with another identical alternator is increased keeping its excitation constant, then

   A.It will supply greater portion of the load

   B.The power factor would be decreased

   C.It would over-run the other alternator

   D.Its rotor will fall back in phase with respect to the other machine

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