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

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

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Electrical Machines
The coil spam

 must be exactly equal to people pitch.
 none of above.
 can never be equal to pole pitch.
  may or may not be exactly equal to people pitch.

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