🔍 Key Concepts

• Difference between splash / ring / disk lubrication and gravity or pressure feed systems • Where line shaft bearings are located and how easily they can be reached for maintenance • Why simple, reliable, low-maintenance systems are preferred for long shaft lines

💭 Think About

• Think about the environment around line shaft bearings in a long shaft tunnel—would piping for pressure systems be practical there? • Which method would allow continuous lubrication while the shaft is rotating, with minimal need for pumps or complicated controls? • Which options depend heavily on pumps or precise flow, and which rely on simple mechanical motion of the shaft itself?

✅ Before You Answer

• Consider which choices are active systems (need pumps/pressure) versus passive systems (work just from shaft rotation or gravity) • Visualize a long propeller shaft tunnel—ask which lubrication method is commonly shown in machinery diagrams for tunnel bearings • Eliminate any option that would be too complex or failure-prone for multiple bearings along a shaft line