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Question

Difficulty: MediumIdentifying Implied Meanings

Passage:
Commercial aircraft hydraulic reservoirs are continuously pressurized with regulated bleed air tapped from the engine compressors. At cruising altitudes exceeding 30,000 feet, ambient atmospheric pressure drops significantly, which reduces the absolute pressure within unsealed fluid containers. Without positive internal air pressure in the reservoir, the engine-driven hydraulic pumps would experience cavitation—the formation and sudden collapse of vapor bubbles—leading to erratic flight control response and rapid pump degradation.

Based on the passage, which of the following is implied regarding high-altitude flight and hydraulic systems?

  1. A
    Engine compressors must avoid supplying bleed air to the reservoir to keep flight controls stable.
  2. Lower ambient atmospheric pressure at cruising altitude increases the tendency of hydraulic fluid to vaporize.Answer
  3. C
    Commercial aircraft are restricted from cruising above 30,000 feet due to unavoidable pump failure.
  4. D
    Cavitation occurs when excess air pressure from the compressor forces bubbles into the fluid lines.

Answer

Lower ambient atmospheric pressure at cruising altitude increases the tendency of hydraulic fluid to vaporize.
The correct answer accurately synthesizes the text clues: high altitude reduces ambient pressure, which would cause fluid vaporization (cavitation) unless actively counteracted by artificial pressurization. Thus, lower ambient pressure increases the fluid's tendency to vaporize.

Step-by-Step Solution

1
Identify the cause-and-effect relationship in the text.
The passage notes that at high altitudes, lower ambient atmospheric pressure reduces container pressure, leading to cavitation (vapor bubbles) unless positive air pressure is applied.
Understanding the interaction between ambient pressure and fluid behavior is essential to identify what is unstated but logically necessary.
2
Deduce the unstated physical implication.
Since artificial pressurization is required to stop vapor bubbles from forming under low ambient pressure, lower atmospheric pressure inherently facilitates the vaporization of the fluid.
An implied meaning is a valid deduction directly supported by the passage facts without introducing unsupported assumptions.
3
Evaluate the answer choices against the deduced implication.
The choice stating that lower ambient atmospheric pressure increases the tendency of hydraulic fluid to vaporize accurately captures this implied concept.
This choice matches the text logic while avoiding verbatim traps or extreme overextensions.

Key Concept

Identifying Implied Meanings
Estimated Time:1m 0s
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Topics

Identifying Implied Meanings

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