Correct Answer:
A. Stray currents from electrical sources in the marina create a galvanic cell with the boat’s metal hull, leading to accelerated corrosion and increased heat around dock fittings.
Explanation:
- A. Correct: Stray currents, often originating from electrical systems in the marina or neighboring boats, can flow through the water and create a galvanic cell with the boat's hull. This leads to accelerated corrosion (hot docking) on the boat’s metal parts that are in contact with the water, and the corrosion can cause localized heating around dock fittings.
- B. Incorrect: Stray currents do not directly heat the marina water to increase engine temperatures. The primary effect is corrosion rather than water heating.
- C. Incorrect: While stray currents can cause electrical interference, they do not primarily affect navigation systems or cause overheating of boat engines. The main issue is corrosion.
- D. Incorrect: Stray currents causing localized corrosion is correct, but the heating of hot spots and reduced efficiency in cooling systems is not a typical consequence of stray currents. The primary concern is accelerated corrosion.
Correct Answer:
A. Stray currents from electrical sources in the marina create a galvanic cell with the boat’s metal hull, leading to accelerated corrosion and increased heat around dock fittings.
Explanation:
- A. Correct: Stray currents, often originating from electrical systems in the marina or neighboring boats, can flow through the water and create a galvanic cell with the boat's hull. This leads to accelerated corrosion (hot docking) on the boat’s metal parts that are in contact with the water, and the corrosion can cause localized heating around dock fittings.
- B. Incorrect: Stray currents do not directly heat the marina water to increase engine temperatures. The primary effect is corrosion rather than water heating.
- C. Incorrect: While stray currents can cause electrical interference, they do not primarily affect navigation systems or cause overheating of boat engines. The main issue is corrosion.
- D. Incorrect: Stray currents causing localized corrosion is correct, but the heating of hot spots and reduced efficiency in cooling systems is not a typical consequence of stray currents. The primary concern is accelerated corrosion.