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Difficulty: MediumDrawing Logical Conclusions

Read the following passage:

High-altitude transport aircraft utilize regulated bleed air from turbine engines to maintain positive pressure inside hydraulic fluid reservoirs. At cruising altitudes above 30,000 feet, low ambient atmospheric pressure decreases the boiling point of hydraulic fluid and reduces the inlet pressure delivered to engine-driven pumps. Without artificial reservoir pressurization, fluid vaporization and destructive cavitation occur within pump chambers during operation.

Statement: Without supplemental reservoir pressurization, ambient atmospheric pressure at high cruising altitudes is inadequate to prevent hydraulic fluid from boiling and damaging the pumps.

Answer: Answer

Answer

True: Ambient atmospheric pressure at cruising altitude is insufficient on its own to keep hydraulic fluid below its boiling point and prevent cavitation without bleed-air pressurization.
The conclusion directly follows from combining two core premises in the text: at cruising altitude, ambient pressure lowers the boiling point of fluid, and omitting supplemental pressurization results in vaporization and cavitation.

Step-by-Step Solution

1
Identify the environmental constraints and operational hazards presented in the text.
Cruising altitudes above 30,000 feet feature low ambient atmospheric pressure, which decreases the hydraulic fluid's boiling point and lowers pump inlet pressure.
Understanding the baseline physical environment is necessary to evaluate why normal atmospheric conditions are insufficient.
2
Determine the role of artificial reservoir pressurization relative to these hazards.
Regulated bleed air provides artificial pressurization to prevent the vaporization and destructive pump cavitation that would otherwise happen.
Establishing the function of the pressurization system clarifies what occurs when it is absent.
3
Synthesize the facts to deduce whether natural ambient pressure alone can maintain safe operating conditions.
Natural atmospheric pressure at high altitudes is demonstrably insufficient, making the evaluated statement strictly true.
Connecting the lack of adequate ambient pressure to the necessity of artificial pressurization validates the logical conclusion.

Key Concept

Drawing Logical Deductions from Multi-Condition Technical Relationships
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Topics

Drawing Logical Conclusions

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