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When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo?

Correct Answer: Use a lower frequency transducer

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Non Destructive Testing and Evaluation MCQ: When testing a test piece with parallel front and back surfaces, no back wall echo can be obtained. Which of the following actions might enable you to obtain a back wall echo? | Extra Education