Alternator Multiple Choice Questions and Answers

46. In an alternator, pitch factor is the ratio of the e.m.fs. of

   A.Full pitch winding to short pitch winding

   B.Short pitch coil to full pitch coil

   C.Distribute winding to full pitch winding

   D.Full pitch winding to concentrated winding

47. At leading power factor, the armature flux in an alternator

   A.Distorts the rotor flux

   B.Aids the rotor flux

   C.Opposes the rotor flux

   D.Does not affect the rotor flux

48. A lower voltage alternator, for the same power rating, will be

   A.More costly

   B.Larger in size

   C.More efficient

   D.Operating at high r.p.m.

49. An alternator operating at lower voltage, for the same power rating, will be

   A.More-efficient

   B.Costllier

   C.Less noisy

   D.Larger in size

50. When two alternators are running in parallel, their kVAR load share and kW load share are changed by changing their

   A.Driving torque, driving torque respectively

   B.Driving torque, excitation respectively

   C.Excitation, driving torque respectively

   D.Excitation and excitation

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