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

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

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Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 voltage ratio of all transformers must be same.
  polarities of all transformers must be same.
 percentage impedance of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.

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Electrical Machines
Cogging of induction motor occurs at

 low voltage and when stator and rotor poles are equal.
 low voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are not equal.
 high voltage and when stator and rotor poles are equal.

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