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

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

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Electrical Machines
What will happen if the the supply terminals are reversed in case of a DC shunt motor?

 The motor will stop.
 The motor will run much faster in the same direction.
 The motor will run in reverse direction.
 The motor will run at its normal speed in the same direction as before.

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