Which statement best describes the lubrication system?

• A. Each engine has its own independent lubrication system
• B. All engines share a single lubrication reservoir
• C. Oil is not circulated
• D. Lubrication is provided by air

Answer: (A)

The main idea is that with more than one engine, each engine needs its own independent lubrication system to ensure reliable, reliable oil delivery to every engine and to avoid cross‑talk between engines. Each engine having its own system means there’s a dedicated oil pump, passages, filters, cooler, and reservoir for that engine, so oil pressure and flow are consistent for that engine regardless of what’s happening in the others. This setup helps prevent one engine’s leaks, contamination, or oil depletion from affecting the others, and it allows separate monitoring and maintenance.

Oil in the system serves to lubricate moving parts, reduce friction, carry away heat, and remove contaminants. It must be circulated continuously through the engine’s bearings and gears, filtered, and cooled. The other statements don’t fit because sharing a single reservoir would risk insufficient lubrication or cross-contamination between engines; letting oil not circulate would cause rapid wear and failure; and lubrication by air cannot provide the continuous film of oil needed for moving parts to operate smoothly.