Electrical Machines
In DC generator, lap winding is used in

 high voltage and low current applications.
 where greater load is connected.
 where constant speed is required.
  high current and low voltage applications.

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Electrical Machines
The introduction of interpoles in between the main poles improves the performance of a dc machine, because

 a counter-emf is induced in the coil undergoing commutation
 the flux waveform is improved with reduction in harmonics
 the inequality of air-gap flux on the top and bottom halves of the armature is removed
 the interpoles produce additional flux to augment the developed torque

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