Electrical Machines
A large series motor is never started without some mechanical on it because otherwise it will

 Produce sparking at brushes.
 Open fuse or circuit breaker.
 Draw too much current.
  Develop excessive speed and damage itself.

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

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

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