Electrical Machines
For larger units high torque it is preferred to use

 Slip induction motor.
 DC shunt motor.
 Partial motor.
 Universal 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 supply voltage during hunting.
 supply voltage and excitation current at constant load.
  power factor and DC excitation at constant load.

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