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Mag Particle LVL 2
| Question | Answer |
|---|---|
| 1. The interpretation of magnetic particle indications may be aided by: a. observing with a magnifying glass b. observing the indications as they are formed c. reproducing the indication residually d. all of the above | d. all of the above |
| 2. Residual magnetism may be beneficial as an aid: a. in the deposition of weld metal b. in interpretation and evaluation of indications c. in demagnetization d. all of the above | b. in interpretation and evaluation of indications |
| 3. An interruption in the normal physical structure or configuration of a part which produces an MT indication is called: a. a discontinuity b. a defect c. an indication d. a deformation | a. a discontinuity |
| 4. Comparing parts that have been circularly magnetized and those that have been longitudinally magnetized, which retains the most objectionable residual field if not demagnetized? a. longitudinal b. circular c. vectored d. remnant | a. longitudinal |
| 5.What type of magnetization uses the formula:Ampere-turns = 45,000/2*L*D? a. circular b. longitudinal c. parallel d. vectored | b. longitudinal coil shot |
| 6. Why are large soft braids used for surfaces or headstocks? a. increase contact area and reduce burning part b. because of their low melting points c. they help heat metal, thus allowing MT induction d. to increase contact area and flux density | a. increase contact area and reduce burning part |
| 7. Rough forging with grinding is MT tested. Indication appears to run sharp, deeply and ⊥in to part surface. What is indication? a. forging burst b. lap c. flake d. seam | a. forging burst |
| 8. A gear with case-hardened ground teeth and hub ends is MT tested. 5 of teeth and one hub end surface have sharp indications. Indication identity? a. grinding cracks b. inclusions c. porosity d. quench cracks | a. grinding cracks |
| 9. If an overall pattern (sometimes circular lines) appears on the test surfaces, how should the inspector reprocess the test piece? a. retest at a higher amperage b. demagnetize c. retest at lower amperage d. both a and b | c. retest at lower amperage |
| 10. A prime consideration when selecting an MT medium is to select a powder that: a. provides a high contrast to surface b. provides a low contrast to surface c. will adhere to surface d. requires a high demagnetization current to remove it | a. provides a high contrast to surface |
| 11. When testing for fine shallow surface cracks, the preferred MT method should be: a. dry AC b. dry DC c. wet AC d. wet DC | c. wet AC |
| 12. Which is advantage of dry method over wet method? a. detects fine surface cracks better. b. gives better surface coverage on irregularly shaped parts c. better for portable equipment in field work d. faster than wet MT for small no of parts | c. better for portable equipment in field work |
| 13. When testing a bar with an L/D ratio of four in a ten-turn coil, the required current would be: a. 1 125 amperes b. 18 000 amperes c. 45 000 amperes d. unknown; more information is needed | c. 45 000 amperes |
| 14. Internal splines and holes to near test surfaces will cause: a. broad, fuzzy indications aligned with part’s internal contours b. sharp, well-defined indications aligned with the part’s internal contours c. no indications d. both a and b | a. broad, fuzzy indications aligned with part’s internal contours |
| 15. Some disadvantages of coil mag methods are: a. that the coil must be of minimum diameter in relation to part b. that the effective MT field is limited to the coil c. that small diameter parts should be close to the coil d. all of the above | c. that small diameter parts should be close to the coil |
| 16. Which of the following depicts the wave form of three-phase full-wave rectified AC? see slide | A |
| 17. Which of the following casting defects is caused by non-uniform cooling resulting in stresses which rupture the surface of the metal? a. shrink b. hot tears c. porosity d. dross | b. hot tears |
| 18. 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: a. inductive reactance b. impedance c. reluctance d. decay | b. impedance |
| 19. In wet continuous MT, a coil shot follows a head shot. To perform coil shot, one must: a. use clean dry rages to remove all residual wet MT fluid. b. demagnetize the part c. Perform coil shot after exam of head shot ind. d. none of these | c. place the part in the coil and continue the inspection after evaluating the head shot indications |
| 20. When adding concentrate to wet magnetic particle suspension liquid, common practice is to: a. add powder directly to the suspension liquid b. make a small, slurry-like test mixture of the powder c. do both of the above d. do neither of the above | c. do both of the above |
| 21. A desirable property of magnetic particles used for the inspection medium for either the dry or wet method is that they: a. are nontoxic b. possess high permeability c. possess low retentivity d. have all of the above characteristics | d. have all of the above characteristics |
| 22. Which of the following can cause nonrelevant magnetic particle indications? a. joints between dissimilar metals b. brazed joints c. roughing tool cuts on surface d. all of the above | d. all of the above |
| 23. External poles, which are too strong to permit good inspection of a part, are more likely to result when using: a. circular magnetization b. longitudinal magnetization c. polarized magnetization d. residual magnetization | b. longitudinal magnetization |
| 24. A rough forging disc: can occur surface or internal; assoc with low processing temp; caused by excessive working; and it creates straight or irregular cavities. This disc would be called: a. a burst b. shrinkage c. a pipe d. a lamination | a. a burst |
| 25. Discontinuities in plate, sheet, or strip caused by pipe, inclusions, or blowholes in the original ingot which, after rolling, are usually flat and parallel to the outside surface are called: a. seams b. laminations c. cracks d. laps | b. laminations |
| 26. On part, where do forging laps occur? a. Occur anywhere, and no relation to working direction b. always occur on thermal center line c. are found 90° angle to long axis on part surface d. always run in working direction | a. may occur anywhere on surface and may bear no relation to axial direction of the part |
| 27. The accumulation of particles at a site on the part surface, collected at and held to the site by the magnetic leakage field, is called: a. a discontinuity b. a defect c. an indication d. magnetic writing | c. an indication |
| 28. Where particles are attracted to a surface magnetic leakage field that is due to unacceptable condition based on applicable standards for the part, then we have: a. a discontinuity b. a defect c. a nonrelevant indication d. all of the above | b. a defect |
| 29. Half-wave rectified AC (HWDC) is used for detection of: a. surface defects only b. subsurface defects only c. surface and subsurface defects d. none of the above | c. surface and subsurface defects |
| 30. Which thin film of oil or grease removal method prior to MT is not acceptable: a. washing with a solvent b. degreasing using a vapor degreasing method c. dusting with chalk then wipe with dry cloth d . brushing the surface with power wire brush | d . brushing the surface with power wire brush |
| 31. Which of the following is a commonly used technique for preserving MT powder patterns? a. clear lacquer b. transparent tape c. photography d. all of the above | d. all of the above |
| 32. All of the following discontinuities are commonly found in rolled products except: a. seams b. laminations c. cold shuts d. cracks | c. cold shuts |
| 33. All of the following discontinuities are commonly found in forged products except: a. laps b. shrinkage c. bursts d. flakes | b. shrinkage |
| 34. Which of the following is a defect commonly associated with the welding process? a. lack of penetration b. flakes c. seams d. laminations | a. lack of penetration |
| 35. Which of these indications may appear as an irregular, checked, or scattered pattern of fine lines usually caused by local overheating? a. fatigue cracks b. grinding cracks c. crater cracks d. HAZ cracks | b. grinding cracks |
| 36. Of the following discontinuity categories, which one is considered most detrimental to the service life of an item? a. subsurface inclusions b. subsurface porosity and voids c. cracks open to the surface d. all of the above | c. cracks open to the surface |
| 37. For current passed thru copper rod in ferrous cylinder, then MT field in cylinder will be: a. same intensity and pattern as in conductor b. greater than in conductor c. less than in conductor d. same regardless of proximity to cylinder wall | b. greater than in the conductor |
| 38. Part length being magnetized by passing an electric current from one end to other: a. affects the permeability of part b. changes the strength of magnetic field c. does not affect strength of magnetic field d. causes magnetic field to vary | c. does not affect strength of magnetic field |
| 39. If (1 in.) and (2 in.) diameter bars are magnetized by passing same current through them, magnetic fields would be: a. same for both b. stronger in (2 in.) diameter bar c. weaker in (1 in.) diameter bar d. stronger in (1 in.) diameter bar | d. stronger in (1 in.) diameter bar |
| 40. If 18 amps is passed through similar copper (non-MT) and iron (MT) rods, MT field around conductors will: a. magnetic conductor is stronger b. non magnetic conductor is stronger c. vary with permeability d. be same for both conductors | d. be same for both conductors |
| 41. The most effective MT method for inspection of a large casting is the use of: a. multidirectional magnetization b. a central conductor c. prod inspection in two directions d. direct magnetization | a. multidirectional magnetization |
| 42. The most common failure mechanism associated with sharp fillets, notches, undercuts, and seams is: a. fatigue cracking b. crystallization c. shrinkage d. decarburization | a. fatigue cracking |
| 43. When a defect has been removed by chipping, grinding, or flame cutting, the next operation is to: a. repair it b. measure it to see if minimum thickness remains c. reexamine the area by magnetic particle testing d. sign off the part | c. reexamine the area by magnetic particle testing |
| 44. When most complete demagnetization is desired by a coil energized with AC of progressively decreasing amperage, the following orientation of the long axis of the part is most desirable: a. East-West b. North-South c. South-West d. North-East | a. East-West |
| 45. Nonrelevant indications from residual local poles interfere with MT testing. For a successful exam, one should: a. use more amperage b. demagnetize then remagnetize in desired direction c. use lower amperage d. magnetize in another direction | b. demagnetize then remagnetize in the desired direction |
| 46. To alleviate the problem of cold working indications in a part, the part should be: a. demagnetized then retested b. retested after stress relieving c. retested in the opposite direction d. remagnetized at a higher amperage | b. retested after stress relieving |
| 47. The unit of measure of one line of flux per square centimeter of area is one: a. oersted b. ohm c. gauss d. ampere | c. gauss |
| 48. The ability of matter to attract other matter to itself is a phenomenon associated with: a. field strength b. magnetism c. coercive force d. pole strength | b. magnetism |
| 49. Materials which are strongly attracted to a magnet are called: a. magnetized b. nonmagnetic c. ferromagnetic d. polarized | c. ferromagnetic |
| 50. Materials which are weakly attracted magnetically are a. paramagnetic b. diamagnetic c. ferromagnetic d. nonmagnetic | a. paramagnetic |
| 51. Materials which are repelled magnetically are called: a. paramagnetic b. diamagnetic c. ferromagnetic d. nonmagnetic | b. diamagnetic |
| 52. The end of a magnet at which the lines of flux are thought of as entering the bar is: a. the north pole b. the south pole c. both north and south poles d. none of the above | b. the south pole |
| 53. A rule for finding detectability of surface disc by MT is that: a. no relation between depth and width b. depth should be five times width of opening of defect at surface c. depth should be at a one-to-one ratio to width d. none of above | b. depth should be five times width of opening of defect at surface |
| 54. The general term used to refer to a break in the metallic continuity of the part being tested is: a. discontinuity b. crack c. seam d. lap | a. discontinuity |
| 55. The pattern of iron powder sprinkled on a paper placed over a bar magnet is called a: a. field survey b. magnetometer c. magnetograph d. fluxmeter | c. magnetograph |
| 56. The lines of force that form a path around a crack in a ring magnet are called: a. magnetic lines b. leakage flux c. field strength d. longitudinal field | b. leakage flux |
| 57. Since the magnetic lines of force within a bar magnet run the length of the bar, it is said to be: a. randomly magnetized b. permanently magnetized c. circularly magnetized d. longitudinally magnetized | d. longitudinally magnetized |
| 58. Lines of flux are thought to leave a magnet at: a. the north pole b. the south pole c. both north and south poles d. none of the above | a. the north pole Magnetic Flux flows from North pole to South pole. |
| 59. A magnetic discontinuity, which is a break in the magnetic uniformity of a part, is related to a sudden change in: a. inductance b. resistivity c. capacitance d. permeability | d. permeability |
| 60. In order to detect defects in different directions in a material by magnetic particle inspection, it is best to use: a. two or more fields in different directions b. only one field c. other probe locations d. a high frequency field | a. two or more fields in different directions |
| 61. On cut blanks of rolled iron bar stock, Head shot reveals 0.25 - 1" broken lines along axis on some pieces. These ind are: a. shrinkage b. machining tears c. surface checking d. nonmetallic inclusions | d. nonmetallic inclusions |
| 62. Weld repaired large forging, weld MT reveals indication at bead center, turning off at ends, running parallel with the weld passes. This ind is: a. inclusions b. crater cracks c. weld shrinkage cracks d. surface checking | c. weld shrinkage cracks |
| 63. What wattage is most commonly used for mercury vapor bulbs for portable fluorescent magnetic particle inspection? a. 200 W b. 50 W c. 100 W d. 75 W | c. 100 W |
| 64. An example of a nonrelevant indication classified as a discontinuity could be caused by: a. a slag pocket b. grinding cracks c. an abrupt change in the hardness of part d. none of the above | c. an abrupt change in the hardness of part |
| 65. Detecting deep-lying (0.25 to 2 in.) defects in heavy weldments is: a. very similar to detection of surface cracks b. not difficult if defect is attributable to fine porosity c. simple if defect’s width can be approximated d. very improbable | d. very improbable |
| 66. in MT inspection, it is best to a. reinspect questionable discontinuities b. make sure all parts meet specified criteria c. make certain that parts are better than specified d. reinspect questionable parts using another NDT method | b. make sure all parts meet specified criteria |
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urbergpm9276
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