Electrical Machines
Which of following components of a DC generator plays vital role for providing direct electric current of a DC generator?

 Dummy coils.
 Commutator.
 Eye bolt.
 Equalizer rings.

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

 supply voltage and excitation current at constant load.
 power factor and supply voltage during hunting.
  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.

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Electrical Machines
In a DC machine, for the same value of φ, Z and N; which one of the following statements is correct?

 Armature emf is same as long as the flux density in the air gap remains the same.
 Armature emf is less with wave winding than with lap winding.
  Armature emf is more with wave winding than with lap winding.
 Armature emf depends on weather the machine is running as a motor or generator.

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