ASNT Level III Chapter 4 EXAM

ASNT Level III Chapter 4 EXAM Which of the following materials cannot be tested by magnetic particle techniques? - Correct Ans-copper alloys Materials that are strongly attracted to a magnet are called: - Correct Ans-ferromagnetic Magnetic lines of force (magnetic fields) are oriented in what direction in relation to the direction of the magnetizing current? - Correct Ans-at right angles Magnetizing flux is a term that relates to: - Correct Ans-the lines of force associated with a magnetic field Subjecting a part to a magnetic field that is constantly reversing in polarity and gradually diminish in strength accomplishes which of the following - Correct Ans-demagnetizes the part Circular magnetization is useful in the detection of: - Correct Ans-longitudinal cracks In which magnetizing method is the current passed directly through the part, thereby setting up a magnetic filed at right angles to the current flow? - Correct Ans-Circular magnetization Which of the following is a major disadvantage of using prods? - Correct Ans-The inspection surface may be arc burned Inspecting a part by applying the magnetic particle suspension while the current is flowing is called the: - Correct Ans-continuous method How is the inside diameter of a cylinder best magnetized? - Correct Ans-With a central conductor place between contact heads The amount of amperage used for magnetic particle inspection using prods is based on the distance between the prods and the: - Correct Ans-thickness of the part Demagnetization of a part is usually not necessary if the part is: - Correct Ans-to be hardened by heat treatment after inspection Which of the following is an advantage of the dry technique over the wet technique? - Correct Ans-It is easier to use for field inspection with portable equipment Fluorescent magnetic particles are used in preference to visible magnetic particles: - Correct Ans-to increase the speed and reliability of detecting very small discontinuities ASNT The most versatile type of magnetic particle equipment is: - Correct Ans-the stationary horizontal machine Magnetic particle inspection methods are recognized as superior to liquid penetrant techniques when the : - Correct Ans-parts are painted When using direct current, an indication is detected. What is the next logical step to determine if the indication results from a surface or subsurface condition? - Correct Ans Reinspect using alternating current A requirement to use magnetic particle testing on a part should also include: - Correct Ans-the procedure to be used and acceptance criteria The statement that amperages testing can be applied to plated and painted parts: - Correct Ans-may be true if amperages are increased to compensate for the coating thickness The best type of magnetizing current for inspection of fatigue cracks is: - Correct Ans alternating current A star-shaped indication is seen on the cover pass of a weld. What type of discontinuity is indicated? - Correct Ans-Crater crack For maximum sensitivity in magnetic particle inspection of rough welds: - Correct Ans The weld bead should be ground to remove surface irregulariti