Non-Destructive Testing (NDT) Practice Test

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When a crack is detected using eddy current inspection, what does the impedance plane display indicate?

  1. No changes in impedance

  2. Impedance changes

  3. Consistent impedance values

  4. Fluctuations in temperature

The correct answer is: Impedance changes

The impedance plane display in eddy current inspection provides a graphical representation of the impedance changes that occur due to the presence of defects, such as cracks. When an eddy current probe is placed near a conductive material, it generates eddy currents that interact with the material's electrical properties. Any discontinuities like cracks will influence the flow of these currents, leading to a measurable change in impedance. In the impedance plane display, these changes manifest as shifts or movements in the plotted points, indicating variations in the impedance as caused by the presence of a crack. This is critical because it allows for the identification and characterization of the defect based on its impact on the impedance behavior. The ability to see impedance changes on the display helps inspectors evaluate the severity and nature of the defect detected, making it an essential aspect of analyzing results in eddy current inspection.

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