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Difficulty: MediumDirect Fact Retrieval

Impressed Current Cathodic Protection (ICCP) systems prevent seawater corrosion on naval ship hulls by supplying an external direct current. An automated controller continuously monitors the hull-to-water electrical potential using zinc reference electrodes mounted below the waterline. When the potential drops below the target threshold, the power unit increases current output through mixed-metal oxide anodes to neutralize electrochemical oxidation. To prevent hydrogen embrittlement in high-strength structural steel, dielectric shield coatings are applied around each anode to limit local current density.

According to the passage, which component is used to monitor the hull-to-water electrical potential?

  1. A
    Mixed-metal oxide anodes
  2. Zinc reference electrodesAnswer
  3. C
    Dielectric shield coatings
  4. D
    Sacrificial magnesium rods

Answer

Zinc reference electrodes
The passage explicitly states that the controller monitors the hull-to-water electrical potential using zinc reference electrodes mounted below the waterline.

Step-by-Step Solution

1
Locate the phrase in the passage referencing the monitoring of electrical potential.
Identified the sentence: 'An automated controller continuously monitors the hull-to-water electrical potential using zinc reference electrodes mounted below the waterline.'
Direct fact retrieval requires locating the exact operational function requested by the stem.
2
Extract the specific component identified with that monitoring function.
Zinc reference electrodes.
The passage explicitly names zinc reference electrodes as the instruments utilized for measurement.

Key Concept

Direct retrieval of explicitly stated technical components and their functional roles from a passage.
Estimated Time:1m 0s
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Direct Fact Retrieval

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