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Difficulty: MediumDistinguishing Main Idea from Details

Read the following passage:

Unlike conventional wet-sump engines that store motor oil directly in an oil pan beneath the crankshaft, dry-sump lubrication systems utilize an external reservoir and multiple scavenge pumps. In high-performance applications, rapid acceleration and sharp cornering can force oil away from the pickup tube in a standard oil pan, leading to dangerous oil starvation. Dry-sump systems eliminate this risk by continuously drawing oil from a shallow pan into the external tank, ensuring steady oil pressure under extreme operating conditions. Furthermore, the shallower oil pan allows the entire engine to be mounted lower in the chassis, improving the vehicle's center of gravity.

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

  1. A
    Wet-sump engines experience dangerous oil starvation when vehicles undergo rapid acceleration and sharp cornering.
  2. Dry-sump lubrication systems utilize external oil reservoirs to ensure consistent lubrication and offer vehicle design benefits under demanding driving conditions.Answer
  3. C
    A shallow oil pan enables technicians to mount the engine lower in the chassis to improve stability.
  4. D
    Multiple scavenge pumps continuously circulate oil directly beneath the crankshaft to maintain pressure.

Answer

Dry-sump lubrication systems utilize external oil reservoirs to ensure consistent lubrication and offer vehicle design benefits under demanding driving conditions.
The statement describing how dry-sump lubrication systems utilize external reservoirs to maintain reliable oil pressure while offering design advantages captures the comprehensive scope of the passage. The entire text is structured to explain how dry-sump systems operate, why they solve wet-sump oil starvation, and what additional vehicle design benefits they provide.

Step-by-Step Solution

1
Analyze the topic and scope of the passage
The text focuses entirely on explaining the function, primary operational benefit, and secondary packaging advantage of dry-sump lubrication systems compared to wet-sump setups.
Determining the subject and scope prevents confusing supporting evidence with the central message.
2
Distinguish central claims from supporting details
Mentions of oil starvation during cornering and lower chassis mounting are individual supporting points that illustrate why dry-sump systems are advantageous.
The main idea must encompass all major points rather than focusing on a single detail.
3
Select the statement that encompasses the entire passage
The statement summarizing how dry-sump systems maintain reliable oil pressure via external reservoirs while providing vehicle design benefits represents the complete main idea.
A comprehensive main idea statement synthesizes the primary thesis without being overly broad or narrowly focused on one detail.

Key Concept

Distinguishing Main Idea from Supporting Details
Estimated Time:1m 0s
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Distinguishing Main Idea from Details

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