Which of the devices listed prevents water...

Question 1 / 270705eccefa1bacbc34ba4d4716f

Question 1 of 270705eccefa1bacbc34ba4d4716f

Which of the devices listed prevents water from entering a ship's hull via the propulsion shaft?

Question 1 of 27070

Which of the devices listed prevents water from entering a ship's hull via the propulsion shaft?

🔍 Key Concepts

• How the propeller shaft passes through the hull at the stern • Which device forms a watertight seal around the rotating shaft • The difference between sealing devices and lubrication/support components

💭 Think About

• Which of these options sounds like it’s meant to seal against water entry, rather than to support or lubricate the shaft? • Think about where the shaft actually exits the hull: what specific fitting is there to keep seawater out while still allowing rotation? • Can a bearing or oiler ring by itself stop seawater, or is its main purpose something else?

✅ Before You Answer

• Identify which choice specifically mentions packing or seal, terms commonly used for watertight closures • Eliminate any components whose primary function is supporting the shaft (carrying weight or alignment) rather than sealing it • Verify which device is located where the shaft passes through the hull plating at the stern

Question 1 of 27070

Which of the devices listed prevents water from entering a ship's hull via the propulsion shaft?

Stern tube packing or mechanical shaft seal

Deflector ring and drain

Spring bearings

Oiler rings