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Difficulty: MediumParagraph Summarization

Read the following passage:

Centrifugal pumps depend on continuous fluid flow to maintain system pressure, but sudden drops in localized liquid pressure can trigger a damaging phenomenon known as cavitation. When pressure near the impeller eye falls below the fluid's vapor pressure, microscopic vapor bubbles rapidly form and then violently collapse against the metal surfaces. Over time, these implosions erode impeller blades, induce severe mechanical vibration, and reduce pumping efficiency. To prevent cavitation, operators must ensure the available Net Positive Suction Head exceeds the pump's required threshold by maintaining adequate inlet pressure and minimizing suction-line friction.

Which of the following statements best summarizes the passage?

  1. A
    Microscopic vapor bubbles form and violently collapse when fluid pressure drops near a pump's impeller eye.
  2. Cavitation causes destructive bubble implosions inside centrifugal pumps due to low pressure, but it can be prevented by maintaining proper suction head.Answer
  3. C
    All industrial fluid systems suffer from mechanical vibration and must undergo complete mechanical redesigns to function efficiently.
  4. D
    Minimizing suction-line friction permanently eliminates the need for operators to monitor fluid inlet pressure during pump operation.

Answer

Cavitation causes destructive bubble implosions inside centrifugal pumps due to low pressure, but it can be prevented by maintaining proper suction head.
The passage follows a problem-solution structure: it introduces cavitation as a pressure-induced failure mode, describes the resulting damage to pump impellers, and explains how operators prevent it by maintaining adequate Net Positive Suction Head. The correct choice synthesizes all three essential elements into a balanced, accurate overview.

Step-by-Step Solution

1
Identify the central topic and problem introduced in the text.
The passage focuses on cavitation in centrifugal pumps, explaining how localized pressure drops below vapor pressure create damaging vapor bubble collapses.
Determining the subject and the problem establishes the core narrative foundation of the paragraph.
2
Identify the consequences and proposed resolution described by the author.
The author outlines the damage caused by cavitation (blade erosion, vibration, lost efficiency) and details how operators prevent it by maintaining adequate suction head.
A full summary must synthesize the problem, its effects, and the preventative method presented in the text.
3
Select the statement that captures all primary components without narrowing or overgeneralizing.
The statement summarizing the cause, structural damage, and operational prevention represents the complete meaning of the entire passage.
A valid summary must encompass the entire scope of the text rather than isolating an individual detail or making unsupported claims.

Key Concept

Synthesizing the cause, consequences, and resolution of a technical problem into a comprehensive summary statement.
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Topics

Paragraph Summarization

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