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

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

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