253. Referring to the illustration of a twin-screw diesel-electric AC propulsion drive system, if either the port propulsion excitation transformer or the port propulsion field controller was inoperable, what statement is true

If either the port propulsion excitation transformer or field controller fails, the port propulsion motor field can be controlled using either the standby excitation/field controller set or the starboard excitation transformer and field controller, as shown in the diagram.