If a main propulsion shafting arrangement is...

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Question 1 of 205eccef9cbacbc34ba4d45bef

If a main propulsion shafting arrangement is such that a strut and strut bearing is required, what is the name of the section of shafting that passes through the hull penetration to the closest watertight bulkhead?

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🔍 Key Concepts

• Understand the function and location of a stern tube in relation to the ship’s hull and watertight bulkheads • Know what part of the shaft is directly connected to the propeller and supported by an external strut bearing • Differentiate between line shaft, thrust shaft, and shaft sections that pass through the hull

💭 Think About

• Ask yourself: which shaft section must provide a tight seal where the shaft passes through the hull to keep water out? • Which option describes the shaft portion specifically associated with the hull penetration, not just any intermediate or propulsion shaft segment? • Which of these shafts is typically located between the stern frame/hull and the first inboard bearing or watertight bulkhead?

✅ Before You Answer

• Identify which term is normally used for the shaft portion that runs inside a sealed tube through the hull • Confirm which shaft name is associated with hull penetration and water‑tightness, not thrust transmission only • Eliminate any option that usually refers to a general or intermediate shaft located fully inside the engine room or between bearings, away from the hull opening

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