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Zorluk: OrtaParaphrased Fact Recognition

In industrial maintenance, ultrasonic non-destructive testing is regularly performed to evaluate wall thinning in high-pressure boiler tubes caused by continuous erosion. During this procedure, high-frequency acoustic waves emitted into the metal bounce off the interior wall surface and return to the transducer. Because corrosion products and scale buildup on the outer surface can attenuate sound waves and distort transit time readings, technicians must mechanically remove surface deposits prior to taking measurements. Additionally, an exact acoustic velocity value for the specific alloy must be programmed into the gauge to prevent calculating incorrect metal thickness.

Based on the passage, why must technicians scrape away surface deposits before performing ultrasonic measurements?

  1. A
    High-frequency acoustic waves continuously erode the interior wall surface if deposits remain.
  2. External residue dampens sound impulses, potentially skewing how the sound's travel duration is calculated.Cevap
  3. C
    Calculating incorrect metal thickness causes scale buildup to rapidly detach from the transducer.
  4. D
    Stripping off the outer layer hardens the boiler alloy against mechanical failure under high steam pressure.

Cevap

External residue dampens sound impulses, potentially skewing how the sound's travel duration is calculated.
The text explicitly states that surface deposits and corrosion attenuate (weaken) sound waves and distort transit time readings. The correct choice restates this exact factual relationship using synonymous phrasing ('dampens sound impulses' for 'attenuates sound waves' and 'skewing how the sound's travel duration is calculated' for 'distort transit time readings') without relying on verbatim word copying.

Adım Adım Çözüm

1
Locate the portion of the text discussing the preparation of boiler tube surfaces.
Identified the sentence: 'Because corrosion products and scale buildup on the outer surface can attenuate sound waves and distort transit time readings, technicians must mechanically remove surface deposits prior to taking measurements.'
The question specifically asks for the reason surface deposits must be removed before testing.
2
Analyze the core factual meaning of the identified sentence.
Surface buildup weakens ('attenuates') acoustic signals and causes inaccuracies in time measurement ('distorts transit time readings').
Understanding the underlying relationship is necessary to recognize the idea expressed in different words.
3
Match the meaning against the choices while filtering out verbatim distractors and unsupported claims.
The statement describing external residue dampening sound impulses and skewing travel duration calculations matches the factual content perfectly.
Paraphrased fact questions require selecting the equivalent concept rather than matching surface keywords.

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Paraphrased Fact Recognition
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Paraphrased Fact Recognition

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