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Soru

Zorluk: OrtaNegative Detail Identification

Modern high-bypass turbofan engines utilize cascade-type thrust reversers to decelerate aircraft upon landing. When deployed, mechanical actuator rings slide the translating cowls aft, exposing stationary cascade vanes while simultaneously positioning blocker doors across the bypass air duct. These blocker doors redirect cold fan bypass airflow forward and outward through the angled cascades to generate reverse thrust. Because the core engine flow remains uninterrupted and continues traveling straight aft, the reverser operates safely without stalling the internal compressor stages. Thrust reversers automatically stow before ground taxi speed drops below sixty knots to prevent airborne ingestion of foreign debris.

According to the passage, all of the following are true regarding cascade thrust reversers EXCEPT:

  1. A
    Translating cowls slide aft to uncover the stationary cascade structures.
  2. B
    Blocker doors deploy across the bypass duct to redirect cold fan air forward.
  3. Core engine exhaust is redirected forward through the cascade vanes to provide stopping force.Cevap
  4. D
    The mechanism stows before taxi speed decreases below sixty knots to prevent debris ingestion.

Cevap

Core engine exhaust is redirected forward through the cascade vanes to provide stopping force.
The passage explicitly notes that core engine flow remains uninterrupted and continues traveling straight aft. Only the cold bypass airflow is redirected forward through the cascades, making the claim that core exhaust is redirected forward factually contradicted by the text.

Adım Adım Çözüm

1
Identify the negative qualifier in the question stem.
The word 'EXCEPT' indicates that the correct answer is the statement contradicted by or absent from the text.
Recognizing the negative requirement prevents accidentally selecting verified facts.
2
Cross-reference each option against the facts provided in the passage.
The passage confirms that cowls slide aft, blocker doors redirect bypass air, and the system stows below sixty knots.
Systematic verification isolates supported details from unsupported or false assertions.
3
Locate the false or contradicted claim.
The text explicitly specifies that core engine flow continues traveling straight aft rather than being redirected forward.
The contradicted statement fulfills the criteria for the correct answer to an EXCEPT question.

Anahtar Kavram

Negative Detail Identification
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