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Difficulty: EasyExplicit Main Idea

Water separator filters play a crucial role in protecting tactical diesel engines from fuel contamination. As diesel fuel flows from the storage tank into the primary filtration unit, the water separator uses gravity and specialized hydrophobic media to extract suspended moisture before the fuel reaches high-pressure injectors. Without this separation process, moisture trapped in the fuel line causes internal corrosion, component seizure, and premature engine failure. Routine draining of the accumulated water bowl ensures that the filtration system continues to deliver clean, dry fuel to the combustion chambers.

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

  1. A
    All mechanical breakdowns in military diesel engines result from neglected fluid maintenance.
  2. Water separator filters are essential for protecting tactical diesel engines against fuel contamination.Answer
  3. C
    Hydrophobic media and gravity extract suspended moisture before fuel reaches high-pressure injectors.
  4. D
    Draining the accumulated water bowl ensures clean fuel delivery to combustion chambers.

Answer

Water separator filters are essential for protecting tactical diesel engines against fuel contamination.
The correct answer directly restates the explicitly stated topic sentence at the start of the paragraph. The entire passage focuses on the vital protective function of water separator filters on diesel engines, using the subsequent lines to explain the physical separation process and the mechanical damage prevented.

Step-by-Step Solution

1
Locate the explicit topic sentence in the passage.
The opening sentence directly states: 'Water separator filters play a crucial role in protecting tactical diesel engines from fuel contamination.'
Explicit main ideas in technical passages are typically announced in the lead sentence.
2
Verify that the remaining sentences serve as supporting evidence for this primary claim.
The subsequent sentences detail how the moisture is extracted, the damage caused by unseparated water, and maintenance steps to preserve filter function.
Supporting details elaborate on the mechanism and consequences of the central concept without replacing it.
3
Select the option that directly paraphrases the overarching thesis rather than isolated facts.
The option stating that water separator filters are essential for protecting tactical diesel engines against fuel contamination matches the topic sentence perfectly.
The correct response must encompass the entire scope of the paragraph.

Key Concept

Explicit Main Idea Identification
Estimated Time:45s
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Explicit Main Idea

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