Discussion
Which of the following statement is wrong for 3 phase induction motor?
Answer: D
The wrong statement is that the direction of rotation cannot be reversed. The direction of rotation of a 3-phase induction motor can be reversed by interchanging any two of the three supply lines, which reverses the direction of the rotating magnetic field.
The other statements are true: it is self-starting, it has a high efficiency, and it always runs below synchronous speed, since a rotor at synchronous speed would have no induced current and so no torque. So the fourth option is the answer.
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