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Zorluk: OrtaNegative Detail Identification

On-Board Inert Gas Generating Systems (OBIGGS) protect military aircraft fuel tanks from explosion by replacing oxygen in the fuel tank ullage with inert nitrogen. Ambient air from the engine bleed system is first routed through an air separation module containing semi-permeable hollow fiber membranes. These membranes separate oxygen and water vapor from nitrogen molecules. The resulting nitrogen-enriched air is continuously discharged into the fuel tanks, maintaining oxygen concentration below nine percent. Because OBIGGS generates nitrogen continuously during flight, it eliminates the requirement for heavy liquid nitrogen storage dewars on board.

According to the passage, all of the following are true of the On-Board Inert Gas Generating System EXCEPT:

  1. A
    It draws ambient air directly from the aircraft engine bleed system.
  2. B
    It uses semi-permeable hollow fiber membranes to isolate nitrogen molecules.
  3. It requires on-board liquid nitrogen storage dewars for long-duration flights.Cevap
  4. D
    It maintains the oxygen concentration inside fuel tank spaces below nine percent.

Cevap

The statement that the system requires on-board liquid nitrogen storage dewars for long-duration flights is the correct answer because it directly contradicts the text.
The passage states that because OBIGGS generates nitrogen continuously during flight, it 'eliminates the requirement for heavy liquid nitrogen storage dewars on board.' The claim that it requires storage dewars directly contradicts the text, making it the correct negative detail.

Adım Adım Çözüm

1
Identify the key requirement of the question stem.
The prompt contains the negative qualifier 'EXCEPT', requiring the identification of the statement that is false or unsupported by the text.
Recognizing negative qualifiers prevents selecting true statements that are directly confirmed by the passage.
2
Evaluate each answer choice against the facts presented in the passage.
The passage confirms that ambient air comes from the engine bleed system, membranes separate nitrogen molecules, and oxygen levels are kept below nine percent. However, the passage explicitly notes that the system eliminates the requirement for liquid nitrogen storage dewars.
Systematic verification isolates the single contradicted or unmentioned detail from the true supporting details.
3
Select the contradicted statement as the final answer.
The claim regarding the requirement for storage dewars is false based on the passage, satisfying the negative criteria.
The passage states that generating nitrogen continuously during flight eliminates the need for storage containers.

Anahtar Kavram

Negative Detail Identification
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Negative Detail Identification

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