Aux 1 Unit 11 Q3

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What is a performance-related disadvantage of water-lubricated stern tube bearings compared to oil-lubricated bearings?

B) Water-lubricated bearings may have higher friction, leading to reduced efficiency, but this can be overcome by optimizing the bearing design and using low-friction materials.

C) Water-lubricated bearings increase fuel efficiency.

D) Water-lubricated bearings improve overall vessel speed.

A) Water-lubricated bearings are more efficient at high speeds.

2 / 7

How do water-lubricated stern tube bearings impact maintenance requirements compared to oil-lubricated bearings?

C) They increase the need for oil filtration.

A) They require more frequent maintenance.

B) They reduce maintenance needs because they do not require an oil lubrication system, which simplifies the overall design and reduces maintenance complexity.

D) They require regular oil changes.

3 / 7

What cost-related advantage do water-lubricated stern tube bearings offer compared to oil-lubricated bearings?

A) They are more expensive to operate.

B) They reduce operating costs by eliminating the need for oil, oil filtration, and monitoring systems.

C) They require more expensive materials.

D) They increase the cost of vessel operations.

4 / 7

How can the issue of reduced lubrication efficiency in water-lubricated bearings be addressed to ensure reliable operation?

C) By increasing the vessel's speed

D) By switching to oil lubrication

A) By using less water in the lubrication process

B) By incorporating grooves in the bearing surfaces to enhance water flow and improve lubrication

5 / 7

What is one environmental advantage of using water-lubricated stern tube bearings compared to oil-lubricated bearings?

D) Water-lubricated bearings increase the risk of marine pollution.

A) Water-lubricated bearings reduce the vessel's speed.

B) Water-lubricated bearings eliminate the risk of oil leakage into the sea, making them more environmentally friendly.

C) Water-lubricated bearings increase the vessel's draft.

6 / 7

What is a potential corrosion-related disadvantage of water-lubricated stern tube bearings, and how can it be overcome?

A) Water-lubricated bearings are immune to corrosion.

D) Corrosion is not a concern with water-lubricated bearings.

B) Water-lubricated bearings are susceptible to corrosion, but this can be mitigated by using corrosion-resistant materials and regular maintenance to prevent corrosion build-up.

C) Water-lubricated bearings do not require corrosion protection.

7 / 7

What is a potential wear-related disadvantage of water-lubricated stern tube bearings compared to oil-lubricated bearings?

C) Water-lubricated bearings require less maintenance.

D) Water-lubricated bearings do not experience wear.

A) Water-lubricated bearings increase the speed of the vessel.

B) Water-lubricated bearings may experience higher wear rates due to lower lubrication quality, but this can be overcome by using advanced composite materials that are more resistant to wear.

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