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Zorluk: OrtaDistinguishing Main Idea from Details

Read the following passage:

Buried steel pipelines are constantly vulnerable to electrochemical corrosion caused by moisture and electrolytes in the surrounding soil. To prevent structural failure and hazardous leaks, pipeline operators rely primarily on sacrificial anode cathodic protection. In this system, more reactive metals like magnesium or zinc are electrically bonded to the steel pipe. Because these auxiliary metals have a more negative electrochemical potential, they corrode in place of the steel, sacrificing themselves to preserve the pipeline's integrity. Routine electrical potential monitoring ensures these sacrificial anodes are replaced before they are completely depleted. Through this electrochemical diversion, operators extend the service life of vital underground infrastructure.

Which of the following best expresses the main idea of the passage?

  1. A
    Soil moisture and electrolytes make buried steel pipelines susceptible to electrochemical corrosion.
  2. Sacrificial anode cathodic protection safeguards underground steel pipelines by directing corrosion onto more reactive metals.Cevap
  3. C
    Reactive metals such as magnesium and zinc have a more negative electrochemical potential than steel.
  4. D
    Regular electrical potential monitoring is conducted to identify when sacrificial anodes must be replaced.

Cevap

Sacrificial anode cathodic protection safeguards underground steel pipelines by directing corrosion onto more reactive metals.
The passage focuses on explaining sacrificial anode cathodic protection: what it is, how it utilizes more reactive metals to spare the steel pipe from corrosion, and why it extends infrastructure lifespan. The statement summarizing this protection mechanism directly represents the main idea.

Adım Adım Çözüm

1
Identify the primary topic and problem introduced in the text.
The text discusses how buried steel pipelines are protected against soil-induced corrosion.
The topic establishes the context for what the rest of the passage explains.
2
Analyze how supporting sentences relate to the central subject.
Mentions of soil moisture, magnesium/zinc potentials, and monitoring schedules serve to explain how and why sacrificial anode cathodic protection functions.
Distinguishing the central mechanism from technical explanations and maintenance tasks isolates the main idea.
3
Synthesize the overarching claim that encompasses the entire paragraph.
The primary claim is that sacrificial anode cathodic protection preserves underground pipelines by sacrificing more reactive metals.
The correct main idea must cover the full scope of the passage rather than a single technical sub-point.

Anahtar Kavram

Distinguishing overarching main ideas from supporting technical and procedural details
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Konular

Distinguishing Main Idea from Details

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