🔍 Key Concepts

• Typical lubrication methods for stern tube bearings • Differences between metal bearings and neoprene/rubber bearings • Why ships use seawater in some shaft and bearing systems

💭 Think About

• Think about what material neoprene or rubber is and what kind of lubricant works well with it in a seawater environment. • Consider which options conflict with each other: if one kind of lubrication is correct, what does that tell you about the other lubrication-related choice? • Ask yourself: would neoprene or rubber bearings normally need mechanical adjustment during operation, or are they designed to be relatively maintenance‑free?

✅ Before You Answer

• Identify which choices talk specifically about how the bearing is lubricated. • Eliminate any choice that suggests a lubrication method that would damage neoprene or rubber over time. • Consider whether cathodic protection is about bearings or about protecting metal parts (like the propeller and shaft) from corrosion.