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Instructions: Please answer the following questions by checking the boxes. Generally, you will have four possible answers. It is possible that more than one answer is correct, even though it may be correct to check all four "Yes" boxes. On the other hand, it may be possible that none of the answers is correct. This means that you may have to check all "No boxes. C
13. Which of the following materials and parameters lead to the highest eddy current penetration depth? Please give a very detail explanation below! 6P Yes No a. Silicon nitride (ceramic) and high-test frequency (10MHz). b. Iron and high-test frequency (IMHZ). c. Aluminum and a low-test frequency (50Hz). d. Aluminum with a high-test frequency (5MHz). 14. Which of the following techniques can be used to detect internal defects of size 200 um or less in the full volume 1 cubic centimeter aluminum block? Please give a very detail explanation below! 6P Yes No a. Micro-focus X-ray Technique. b. Liquid Penetrant Testing (LPT). c. Optical Microscopy. d. Acoustic Microscopy.