Electrical Machines
A frog leg winding is used in a DC machine to eliminate

 the use of compensating winding.
  the use equalizer in lap winding.
 reactance voltage produced due to communication.
 the use drum winding.

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Electrical Machines
If two 8-pole dc machines of identical armature sare wound, one with lap winding and the other with wave winding, then

 lap-wound machine will have more rated voltage and more current
 wave-wound machine will have more rated current and more voltage
 wave-wound machine will have more rated voltage and less current
 lap-wound machine will have more rated voltage and less current

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