🔍 Key Concepts

• Stern tube function in a propulsion shaft system (supports and seals the tail shaft where it exits the hull) • Normal cooling and lubrication arrangements for a stern tube (sea water vs. oil-lubricated systems) • Difference between a primary supply line and an auxiliary flushing connection

💭 Think About

• Think about what the main job of a stern tube flushing connection is during normal operation, not just during repairs • Consider which options describe a continuous, routine function versus a special or emergency function • Ask yourself: does a flushing connection usually replace the main supply, or does it support/augment it?

✅ Before You Answer

• Verify which option best matches lubrication and cooling needs of the stern tube bearing during operation • Check if any choice suggests the flushing connection is the only source of water and whether that is realistic for safe design • Look for the option that describes a function that would be used whenever extra flow is needed through the stern tube (cooling/lubricating/flushing) rather than only in a rare maintenance scenario