Which of the Following Is a Factor That Causes the Magnetic

question 10

Multiple Choice

Which of the following is a factor that causes the magnetic field of a three-phase motor to rotate?

• A) The voltages of a three-phase system are 90 degrees out of phase with each other.
• B) The three voltages change polarity at regular intervals.
• C) The pole pieces are wound such that they will always have the same magnetic polarities.
• D) The stator windings are arranged around the outside of the motor.

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