Discussion
The direction of rotation of a three-phase induction motor is reversed by
Answer: C
Correct answer: interchanging any two supply leads
Swapping any two of the three leads reverses the phase sequence, and the direction of the rotating field follows the sequence. Reversing all three restores the original sequence and changes nothing - it is the same rotation relabelled. Opening the rotor circuit merely removes the torque, and raising the frequency speeds the machine up in the direction it was already going.
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