In an azipod propulsion system, how is direct current delivered to the synchronous propulsion motor rotor for synchronous operation?

Correct Answer: Option C — By the use of slip rings and brushes.

Synchronous propulsion motor rotors inside an azipod require direct current for field excitation, delivered across heavy-duty slip rings and carbon brushes. This standard arrangement complies with IEEE 45 specifications for rotating electrical machinery excitation circuits.