Alternator Multiple Choice Questions and Answers

6. Hydrogen is used in large alternators mainly to

   A.Reduce distortion of waveform

   B.Cool the machine

   C.Strengthen the magnetic field

   D.Reduce eddy current losses

7. The frequency of voltage generated in large alternators is

   A.50 Hz

   B.60 Hz

   C.In kilo cycles

   D.In mega cycles

8. An alternator coupled to which primemover will usually have the highest rotating speed

   A.Steam engine

   B.Reciprocating diesel engine

   C.Francis turbine

   D.Steam turbine

9. In an alternator the voltage generated per phase is proportional to

   A.Number of turns in coil

   B.Flux per pole

   C.Frequency of waveform

   D.All of the above

10. When a three-phase alternator supplies capacitive load, armature reaction flux will be

   A.Opposing the main magnectic field

   B.Helping the main magnetic field

   C.Either (a) or (b)

   D.None of the above

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