🔍 Key Concepts

• Trace the power and control paths from the 4160 VAC main switchboard to each propulsion motor’s field windings. • Identify what equipment is labeled as standby and see which motor(s) it can be connected to. • Compare whether there is any cross-connection between the port and starboard excitation/field control equipment, apart from the standby units.

💭 Think About

• Starting at the port propulsion motor, follow backwards: which excitation transformer and field controller normally supply its field, and what alternative sources are drawn? • Look carefully at the lines from the standby excitation transformer and standby field controller: do they connect only to one side, or are they arranged so they can be switched to either propulsion motor? • Check if the starboard excitation transformer and field controller have any lines or switches leading to the port propulsion motor field circuit, or only to their own motor.

✅ Before You Answer

• Verify exactly how many separate excitation transformers are shown (port, starboard, and any standby) and where each output goes. • Confirm whether the standby field controller has connections that can be selected to feed the port propulsion motor field. • Confirm whether there is any drawn connection allowing the starboard excitation transformer/field controller to feed the port propulsion motor field; if none is drawn, don’t assume it exists.