Electrical Machines
The direction of rotation of a 3 - Φ induction motor is clockwise when it is supplied with 3 - Φ sinusoidal voltage having phase sequence A - B - C. For counterclockwise rotation of motor, the phase sequence of the supply should be

 C - A - B.
 B - C - A or C - A - B.
 B - C - A.
  A - C - B.

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

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

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