Electrical Machines
which of the following type of brush and their application is/are correct

 copper graphite → low voltage high current density
All of these
 electro graphite → large ratings
 carbon brush → normal ratings

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Electrical Machines
An inverted V curve of synchronous motor shows variation of

 power factor and supply voltage during hunting.
 supply voltage and excitation current at constant load.
  power factor and DC excitation at constant load.
 supply voltage and field current at constant excitation.

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