Electrical Machines
The three point starter is used for

  Shunt motor.
  Shunt, compound and series motor.
  Shunt motor as well as compound motors.
  Series motor.

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

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

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