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How can the challenges of demagnetization and magnetization of permanent magnets be overcome?
What strategies can be used to avoid the use of brushes and commutators in DC machines? (Select the two correct answers)
What is the role of brushes and commutators in a DC machine?
What type of magnetic fields are present in DC machines?
What is the characteristic of the rotating magnetic field in a DC machine?
What are the characteristics of the rotating magnetic field in a DC machine? (Select the two correct answers)
What is the nature of the magnetic field in DC machines?
What is the nature of the magnetic field in AC machines with a single coil and AC supply?
What happens when the coils are mechanically displaced by 90 degrees and electrically excited with a 90-degree phase shift?
What are the factors that influence the formation of rotating magnetic fields? (Select the two correct answers)
What happens when there is no symmetrical mechanical or electrical displacement?
What can unsymmetrical rotating magnetic fields cause in a machine?