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Which risk increases during pipeline weld inspection using phased array ultrasonic testing?

A)Spurious indications obscure real defects
B)Insufficient acoustic coupling worsens resolution
C)Refraction creates erroneous beam steering
D)Attenuation causes signal-to-noise degradation

💡 Explanation

Spurious indications increase, because **constructive interference** sums small reflections from grain boundaries, therefore, mimicking flaws as larger defects rather than revealing the true discontinuity, because other options affect signal strength.

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