Electrical Machines
Lap winding is prefered for which type of machines?

 high current and low voltage
 low current and high voltage
 low current and low voltage
 high current and high voltage

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Electrical Machines
Flashing the field of DC generator means

 increasing flux density by adding extra turns of winding.
  neutralising residual magnetism.
  creating residual magnetism by a DC source.
  making the magnetic losses forces parallel.

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Electrical Machines
Which of the following represents the commutator pitch?

 Number of commutator segments between two successive coils.
 The distance between the staring of first coil and its next successive coil
 Number of conductors spanned by one coil at the back end of the armature.
 Number of conductors spanned by one coil at the front end of the armature.

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