Question 521Electricity & Electronics - Assistant Engineer

The correct answer is C) By the use of slip rings and brushes. In an azipod propulsion system, the synchronous propulsion motor rotor requires direct current (DC) to operate synchronously. This DC is delivered to the rotor windings through the use of slip rings and brushes. The slip rings are mounted on the rotor shaft and rotate with it, while the brushes are stationary and make contact with the slip rings, allowing the DC to be transferred to the rotor windings. The other options are incorrect because A) direct connection to the rotor windings would not allow for the necessary rotation of the rotor, B) the magneto effect alone cannot provide the required DC, and D) commutator bars and brushes are used in DC motors, not synchronous motors like those used in azipod propulsion systems.