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Difficulty: HardParaphrased Fact Recognition

Read the following passage:

Modern aviation turbofan engines operate at combustion temperatures exceeding the melting thresholds of high-strength nickel-base superalloys. To protect high-pressure turbine blades, manufacturers deposit thin ceramic thermal barrier coatings, predominantly yttria-stabilized zirconia, onto metallic components via electron-beam physical vapor deposition. Rather than directly cooling the underlying metal, this ceramic layer exhibits extremely low thermal conductivity, creating a steep temperature drop across its thickness while internal compressor bleed air circulates through cast cooling passages within the blade core. Consequently, the ceramic insulation permits elevated combustor discharge temperatures without subjecting the supporting structural metal to thermal deformation.

Based on the passage, the ceramic coating prevents structural distortion of turbine components by resisting heat transmission and establishing a sharp thermal gradient across its depth.

Answer: Answer

Answer

True: The passage directly supports the claim that the ceramic layer prevents thermal deformation by acting as a low-conductivity insulator that creates a steep temperature drop across its thickness.
The statement is fully substantiated by the text. The passage confirms that the ceramic layer's low thermal conductivity produces a steep temperature drop across its thickness, protecting the structural substrate from heat-induced deformation.

Step-by-Step Solution

1
Analyze the assertion in the stem to isolate the key causal mechanisms and factual claims.
The statement claims that ceramic coatings avert structural distortion by impeding heat flow and creating a significant temperature difference across their thickness.
Isolating the core claims allows direct cross-referencing against explicit details in the reading passage.
2
Locate and extract the corresponding factual evidence from the passage.
The text notes that the ceramic coating 'exhibits extremely low thermal conductivity, creating a steep temperature drop across its thickness,' which ensures engine operation 'without subjecting the supporting structural metal to thermal deformation.'
Finding the specific textual reference confirms the exact physical process described by the author.
3
Evaluate the paraphrase mapping between the statement and the textual evidence.
'Resisting heat transmission' accurately paraphrases 'extremely low thermal conductivity,' 'sharp thermal gradient across its depth' accurately restates 'steep temperature drop across its thickness,' and 'prevents structural distortion' restates 'without subjecting the supporting structural metal to thermal deformation.'
Confirming semantic equivalence establishes that the statement is an accurate paraphrase and therefore factually true.

Key Concept

Paraphrased Fact Recognition in Technical Passages
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Paraphrased Fact Recognition

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