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Difficulty: MediumDrawing Logical Conclusions

Modern hydraulic excavators rely on incompressible fluid to transfer force from the pump to the actuators. When suction lines develop minute air leaks, atmospheric air is drawn into the low-pressure fluid stream. Under operational pressure cycles, these entrained air bubbles collapse violently near pump impellers, producing micro-jets that pit and erode metallic components. Furthermore, because air compresses easily under load, the presence of dissolved air bubbles causes spongy, delayed cylinder response and reduced lifting capacity.

Based on the passage, which of the following conclusions is most logically supported?

  1. A
    Operating hydraulic machinery under heavier loads eliminates spongy cylinder response by expelling entrained air.
  2. Maintaining airtight integrity in suction lines is essential for preserving both component lifespan and responsive machine handling.Answer
  3. C
    Using high-viscosity synthetic fluid prevents micro-jets from pitting metallic pump impellers during standard operation.
  4. D
    Dissolved air bubbles in low-pressure fluid streams enable pump impellers to transfer force directly to actuators.

Answer

Maintaining airtight integrity in suction lines is essential for preserving both component lifespan and responsive machine handling.
The passage establishes that entrained air from suction leaks causes mechanical erosion on pump impellers and causes sluggish, spongy cylinder performance. It is therefore strictly logical to conclude that preventing air intrusion by keeping suction lines airtight is necessary to maintain both component durability and responsive machine control.

Step-by-Step Solution

1
Analyze the cause-and-effect relationships presented in the text.
Air entering via suction line leaks leads to two distinct problems: physical pitting/erosion of pump impellers from collapsing bubbles, and sluggish cylinder response due to air compressibility.
Drawing a valid logical conclusion requires synthesizing all stated effects of the central operational issue.
2
Evaluate which statement represents an inescapable deduction from these combined premises.
Preventing suction line air leaks (maintaining airtight integrity) directly avoids both component wear and control sluggishness.
A sound conclusion directly reflects the synthesized constraints of the passage without adding unsupported assumptions.

Key Concept

Drawing Logical Conclusions from Technical Constraints
Estimated Time:1m 15s
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Drawing Logical Conclusions

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