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

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

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Electrical Machines
Slip speed is the

  difference of synchronous speed and actual rotor speed.
  half of the sum of synchronous and rotor speeds.
  sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.

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