Mag Particle LVL 2
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| 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 | show 🗑
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| 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 | show 🗑
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| show | a. a discontinuity
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| show | a. longitudinal
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| show | b. longitudinal coil shot
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| show | a. increase contact area and reduce burning part
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| show | a. forging burst
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| show | a. grinding cracks
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| show | c. retest at lower amperage
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| show | a. provides a high contrast to surface
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| 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 | show 🗑
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| 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 | show 🗑
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| show | c. 45 000 amperes
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| 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 | show 🗑
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| show | c. that small diameter parts should be close to the coil
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| 16. Which of the following depicts the wave form of three-phase full-wave rectified AC? see slide | show 🗑
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| 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 | show 🗑
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| 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 | show 🗑
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| 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 | show 🗑
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| 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 | show 🗑
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| 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 | show 🗑
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| 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 | show 🗑
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| show | b. longitudinal magnetization
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| show | a. a burst
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| 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 | show 🗑
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| 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 | show 🗑
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| show | c. an indication
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| show | b. a defect
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| show | c. surface and subsurface defects
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| show | d . brushing the surface with power wire brush
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| show | d. all of the above
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| 32. All of the following discontinuities are commonly found in rolled products except: a. seams b. laminations c. cold shuts d. cracks | show 🗑
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| 33. All of the following discontinuities are commonly found in forged products except: a. laps b. shrinkage c. bursts d. flakes | show 🗑
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| show | a. lack of penetration
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| show | b. grinding cracks
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| show | c. cracks open to the surface
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| show | b. greater than in the conductor
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| 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 | show 🗑
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| show | d. stronger in (1 in.) diameter bar
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| show | d. be same for both conductors
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| show | a. multidirectional magnetization
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| show | a. fatigue cracking
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| show | c. reexamine the area by magnetic particle testing
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| 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 | show 🗑
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| 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 | show 🗑
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| 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 | show 🗑
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| show | c. gauss
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| 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 | show 🗑
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| 49. Materials which are strongly attracted to a magnet are called: a. magnetized b. nonmagnetic c. ferromagnetic d. polarized | show 🗑
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| show | a. paramagnetic
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| 51. Materials which are repelled magnetically are called: a. paramagnetic b. diamagnetic c. ferromagnetic d. nonmagnetic | show 🗑
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| 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 | show 🗑
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| show | b. depth should be five times width of opening of defect at surface
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| 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 | show 🗑
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| show | c. magnetograph
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| show | b. leakage flux
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| show | d. longitudinally magnetized
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| show | a. the north pole
Magnetic Flux flows from North pole to South pole.
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| 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 | show 🗑
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| 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 | show 🗑
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| show | d. nonmetallic inclusions
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| show | c. weld shrinkage cracks
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| show | c. 100 W
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| show | c. an abrupt change in the hardness of part
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| 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 | show 🗑
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| show | b. make sure all parts meet specified criteria
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urbergpm9276
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