MT Level 2 100% SOLUTIONS QUESTION AND ANSWER

MT Level 2 100% SOLUTIONS QUESTION AND ANSWER Which one of the following is not a discontinuity common to forged products? - ANSWER Shrinkage A gear with case-hardened ground teeth and hub ends is MT tested. Individual indications are detected on five teeth and one end surface of the hub. The indications do not break over the part edges. What is the probable identity of the indication? - ANSWER Grinding cracks Lines of flux are thought to leave a magnet at: - ANSWER the north pole The length of a part being magnetized by passing an electric current from one end to the other: - ANSWER does not affect the strength of the magnetic field The end of a magnet at which the lines of flux are thought of as entering the bar is: - ANSWER the south pole The most common failure mechanism associated with sharp fillets, notches, undercuts, and seams is: - ANSWER fatigue cracking The term used to refer to the total opposition to flow of current represented by the combined effect of resistance, inductance, and capacitance of a circuit is: - ANSWER impedance In order to detect defects in different directions in a material by magnetic particle inspection, it is best to use: - ANSWER two or more fields in different directions. If a copper conductor is placed through a ferrous cylinder and a current is passed through the conductor, then the magnetic field (flux density) in the cylinder will be: - ANSWER greater than in the conductor If an overall pattern (sometimes circular lines) appears on the test surfaces, how should the inspector reprocess the test piece? - ANSWER Retest at lower amperage Half wave rectified AC (HWDC) is used for detection of: - ANSWER surface and subsurface defects Which of the following is a defect commonly associated with the welding process? - ANSWER Lack of penetration Which of the following is not an acceptable technique for removing a thin film of oil or grease prior to magnetic particle testing? - ANSWER Brush the surface with power wire brush Which of these cracks may appear as an irregular, checked, or scattered pattern of fine lines usually caused by local overheating? - ANSWER Grinding cracks A desirable property of magnetic particles used for the inspection medium for either the dry or wet method is that they: - ANSWER have all of the above characteristics (possess low retentivity, posses high permeability,and be non-toxic) An interruption in the normal physical structure or configuration of a part which produces an MT indication is called: - ANSWER a discontinuity. When the most complete demagnetization available is desired and demagnetization is to be accomplished by placing the part in a coil energized with AC of progressively decreasing amperage, the following orientation of the long axis of the part is most desirable: - ANSWER East-West When testing a bar with an L/D ratio of four in a ten-turn coil, the required current would be: - ANSWER 1125 amperes When testing for fine shallow surface cracks, the preferred MT method should be: - ANSWER wet A/C Residual magnetism may be beneficial as an aid: - ANSWER in interpretation and evaluation of indications.