When a vessel is underway, a small amount of...

Question 1 / 270705eccefa1bacbc34ba4d47173

Question 1 of 270705eccefa1bacbc34ba4d47173

When a vessel is underway, a small amount of water is allowed to leak through the water lubricated stern tube stuffing box in order to __________.

Back

Question 1 of 27070

When a vessel is underway, a small amount of water is allowed to leak through the water lubricated stern tube stuffing box in order to __________.

🔍 Key Concepts

• Water-lubricated stern tube stuffing box purpose and design • How packing around a shaft behaves when the shaft is turning • Why controlled leakage is sometimes necessary in rotating shaft seals

💭 Think About

• Think about what happens to the packing material when the propeller shaft spins at high speed and the packing is squeezed tightly against it. • Ask yourself: what problem would occur first if absolutely no water were allowed past the stuffing box while underway? • Consider which choice describes something that must be happening continuously any time the shaft is turning, not just in special situations like shallow water.

✅ Before You Answer

• Verify which choices describe a function that is continuous and necessary for normal operation, not just in unusual conditions. • Check which option is directly related to friction and heat at the packing/shaft interface. • Eliminate any options that mainly concern parts outside the stuffing box (such as distant bearings or struts).

Question 1 of 27070

When a vessel is underway, a small amount of water is allowed to leak through the water lubricated stern tube stuffing box in order to __________.

flush out silt and mud which can accumulate from shallow water

prevent overheating of the packing

ensure positive coolant flow through the strut bearings

prevent seizing of the rubber strips in the bearing bushing

Question 1 / 270705eccefa1bacbc34ba4d47173

Question 1 of 270705eccefa1bacbc34ba4d47173

When a vessel is underway, a small amount of water is allowed to leak through the water lubricated stern tube stuffing box in order to __________.

Back

Question 1 of 27070

When a vessel is underway, a small amount of water is allowed to leak through the water lubricated stern tube stuffing box in order to __________.