An excessive amount of water is prevented...

Question 1 / 270705eccefa1bacbc34ba4d4716e

Question 1 of 270705eccefa1bacbc34ba4d4716e

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the __________.

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Question 1 of 27070

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the __________.

🔍 Key Concepts

• Stern tube bearing purpose and location on the vessel • Difference between a bearing material and a seal/packing • How water-lubricated shaft systems control seawater entering the hull

💭 Think About

• Think about which component actually forms a restriction or seal around the shaft where it passes through the hull into the vessel. • Ask yourself: which choice is mainly used as a bearing surface material, and which is used specifically to limit water ingress? • Consider whether the component is located outside near the propeller or inside at the inboard end of the stern tube.

✅ Before You Answer

• Identify which option is known as a sealing or packing device around the shaft. • Confirm which item is traditionally a bearing material (not a seal) used in older water-lubricated bearings. • Eliminate any component whose main job is propulsion or support of the propeller, not sealing.

Question 1 of 27070

An excessive amount of water is prevented from entering a vessel using a water lubricated stern tube bearing by the use of the __________.

propeller hub

lignum vitae

shaft packing

labyrinth seal