FAA general Materials and Processes questions with correct answers

Zyglo or dye penetrant. CORRECT ANSWER What is the proper type of nondestructive inspection to use for locating surface cracks in an aluminum alloy casting or forging? Clean the part thoroughly and apply the penetrant and allow it to soak for the recommended time. Remove all of the penetrant from the surface and apply the developer. CORRECT ANSWER Explain the procedure to use when making a dye penetrant inspection of a part. Thoroughly clean the part, magnetize it as directed by the appropriate service manual, flow the indicating medium over the surface, and inspect it under a "black" light. When the inspection is complete, thoroughly demagnetize the part. CORRECT ANSWER Explain the procedure to use when making a magnetic particle inspection of a part. Eddy current inspection. CORRECT ANSWER What inspection method would be the most appropriate for checking a nonferrous metal part for intergranular corrosion? X-ray inspection. CORRECT ANSWER What inspection method would be most appropriate for checking the internal structure of an airplane wing for corrosion? If the parts are not completely demagnetized, they will attract steel particles that are produced by engine wear and will cause damage to bearing surfaces. CORRECT ANSWER Why is it important that all engine parts which have been inspected by magnetic particle method be completely demagnetized?