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

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Electrical Machines
Slip speed is the

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

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