🔍 Key Concepts
• Look closely at the labels printed on the panel and schematic, especially any words related to navigation or lighting.
• Notice the separate normal and emergency power sources feeding the same set of lamps and the associated alarm/buzzer circuit.
• Compare the components shown (lamps, transfer switch, pilot light, trouble buzzer, watertight plugs) with what you would expect in an uninterruptible power supply, a fluorescent light, a dual‑speed motor controller, or a ship’s light circuit.
đź’ Think About
• Which choice would normally require a dedicated panel clearly labeled for specific lights on the vessel, with individual switches for port, starboard, masthead, stern, and tow lights?
• Which type of circuit typically uses watertight receptacles and plugs near the weather deck, and must have automatic transfer to an emergency source plus failure alarms for safety of navigation?
• Do any of the other answer choices commonly include an audible/visual failure alarm and a change‑over transfer switch between normal and emergency sources for multiple exterior lamps?
âś… Before You Answer
• Verify any text on the drawing that names the panel or the type of circuit; those words usually match one of the answer choices closely.
• Confirm whether the loads at the bottom of the schematic are lamps arranged in compartments rather than a motor or ballast components.
• Check that the presence of a change‑over (transfer) switch, pilot light, and trouble buzzer/relay fits best with only one of the four options.