Mag Particle LVL1
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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| show | c. both a and b
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| 2. Ferromagnetic material is: a. strongly attracted by a magnet b. capable of being magnetized c. both a and b d. not capable of being magnetized | show 🗑
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| 3. The permeability of a material describes the: a. ease with which it can be magnetized b. depth of the magnetic field in the part c. length of time required to demagnetize it d. ability to retain the magnetic field | show 🗑
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| show | d. ability to retain the magnetic field
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| 5. Why are magnetic particles available in different colors? a. for color contrast with the part surface b. to enhance the detection of indications c. both a and b d. different colors are used with different magnetic flux values | show 🗑
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| 6. Which of the following can be magnetized? a. iron b. nickel c. cobalt d. all of the above | show 🗑
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| show | b. magnetizing current is flowing
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| 8. If a crack exists in a circular magnet, the attraction of magnetic particles to the crack is caused by a: a. coercive force b. leakage field c. Doppler effect d. high reluctance at the crack | show 🗑
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| 9. The unit usually used to denote flux density is the: a. Gauss b. Henry c. farad d. ampere | show 🗑
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| show | d. all of the above
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| 11. Magnetic flux lines which are parallel to a discontinuity produce: a. strong indications b. weak indications c. no indications d. fuzzy indications | show 🗑
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| 12. A part is adaptable to magnetic particle inspection if: a. it is attached to an electrostatic field b. the material is ferromagnetic c. the material is nonferrous d. the material is an electric conductor | show 🗑
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| show | b. the right hand rule
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| show | b. strength of the applied magnetizing force
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| show | c. both a and b
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| show | d. all of the above
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| 17. An electrical yoke produces: a. a longitudinal field b. a circular field c. alternating fields d. a swinging field | show 🗑
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| show | b. a longitudinal field
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| show | b. ampere-turns
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| 20. Magnetic lines of force: a. travel in straight lines b. form a closed loop c. are randomly oriented d. overlay in highly ferromagnetic materials | show 🗑
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| show | c. 90° to the magnetic field
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| show | d. all of the above
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| show | d. all of the above
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| show | b. distance between the prods
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| 25. The flux within and surrounding a magnetized part or around a conductor carrying a current is known as: a. saturation point b. magnetic field c. ferromagnetic d. paramagnetic | show 🗑
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| 26. The areas on a magnetized part from which the magnetic field is leaving or returning into the part are called: a. salient points b. defects c. magnetic poles d. nodes | show 🗑
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| 27. A metal that is difficult to magnetize is said to have: a. ‘high permeability b. low permeability c. high reluctance d. low retentivity | show 🗑
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| show | b. residual field
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| 29. Why disassemble parts before magnetic particle inspection? a. disassembly makes all surface areas visible b. interfaces create leakage fields which exam c. it is easier to handle disassembled parts d. all of the above | show 🗑
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| 30. Subsurface discontinuity indications usually appear: a. sharp and distinct b. sharp and wide c. wide and fuzzy d. high and loosely held | show 🗑
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| 31. Which residual field is most difficult to demagnetize? a. longitudinal b. circular c. vector d. binodal | show 🗑
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| 32. Which technique is the most sensitive? a. continuous b. residual c. interrupted d. counter-current | show 🗑
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| show | a. AC
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| show | c. black light
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| 35. Inspecting a part by magnetizing, removing the current flow, and then applying the medium is called the: a. continuous method b. wet method c. residual method d. dry method | show 🗑
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| 36. False indications are caused by magnetic particles being held to the part by which of the following means? a. gravity b. mechanical c. both a and b d. none of the above | show 🗑
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| show | d. dry continuous method using prods with HWRC
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| 38. A curve to show magnetizing force to the strength of the magnetic field produced in a certain material. It is known as the: a. magnetic force curve b. hysteresis curve c. saturation curve d. induction curve | show 🗑
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| show | a. continuous
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| show | a. check if demag needed between exams
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| 41. When there is absolutely no pattern or distribution of magnetic particles, the possible cause is that: a. the material is nonmagnetic b. the amperage setting is too low c. no current is being applied d. any of the above could be true | show 🗑
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| show | b. change of section , high amperage, hole drilled near surface
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| show | b. it may cause magnetic writing
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| 44. The point at which the magnetism in a material cannot be increased even though the magnetizing force continues to increase is known as the: a. salient pole b. saturation point c. residual point d. remnant point | show 🗑
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| show | a. AC
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| 46. A high velocity flow of wet method bath over specimen surfaces after removal MT current may cause: a. a fine or weakly held indication to be washed away b. no problems c. particles to be splashed into eyes d. none of the above | show 🗑
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| show | b. parts are highly retentive
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| show | b. deep seated cavities
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| 49. The wet fluorescent magnetic particle inspection method is the same as the standard wet magnetic particle method with the exception of requirements for: a. black light b. higher current c. a different machine d. type of current | show 🗑
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| show | a. sharp and distinct
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| 51. Which of the following will produce circular magnetism? a. passing current through a coil b. placing the test part in a solenoid c. passing current through prods d. yokes | show 🗑
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| 52. For wet continuous method, the flow of suspension from the hose should be shut off: a. immediately after applying the current b. immediately before applying the current c. while the current is flowing d. 30 seconds before applying the current | show 🗑
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| show | b. inside edge
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| show | c. pass current through a central conductor
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| 55. What equipment is used to determine whether a part has been demagnetized? a. a magnet on the part b. a field meter c. a survey meter d. careful observation for clinging magnetic particles | show 🗑
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| show | b. half-wave rectified alternating current
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| show | a. creates a magnetic field around the wire
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| 58. Why should parts be cleaned after demagnetization? a. to assure that the magnetic particles are removed b. to prevent false indications c. tn save the solids of the suspension d. to prevent cracking during heat treatment | show 🗑
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| show | b. ampere-turns
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| show | c. a magnetic leakage field
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| 61. In a magnetic particle test, assuming that all of the following are in the same relative position in a small part, which would be the hardest to detect? a. a surface crack b. a near surface crack c. a scratch d. a seam | show 🗑
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| 62. If wet magnetic particle suspension is not uniform, then: a. indication strength may vary, creating erroneous interpretation. b. the magnetic flux would not be uniform c. greater mobility would be required d. the part cannot be magnetized | show 🗑
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| 63. Which of the following will best define surface cracks? a. half-wave rectified AC b. DC c. AC d. surge current | show 🗑
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| show | b. circular
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| 65. Using “Right Hand Rule,” passing current parallel to expected defects in round bar reveals: a. current direction is in line with the defect b. MT field is at right angles to defect c. it makes no difference d. MT field is parallel to the defect | show 🗑
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| 66. If a current is passed through an electrical conductor, what will surround the conductor? a. an eddy current field b. current c. a magnetic field d. a residual field | show 🗑
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| show | b. the right hand rule
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| show | a. create a longitudinal magnetic field
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| show | c. circular magnetization
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| show | b. circular field
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| 71. The area of maximum induced field strength using a yoke is: a. at the North pole of the yoke b. at the South pole of the yoke c. the area directly between the poles d. on the outside of pole pieces | show 🗑
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| show | c. flux density
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| 73. The major factor that determines the success of magnetic particle inspection is the: a. field strength b. voltage on magnetizing coil c. current through the coil d. time of magnetization | show 🗑
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| show | b. AC
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| show | c. the masking of indications
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| show | b. the high speed of inspection
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| 77. The proper way to apply dry magnetic particle powder is to: a. forcibly apply it with air b. roll the material in the container of powder c. apply it from the bottom of the part d. float the particles to exam surface as gently as possible | show 🗑
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| 78. When using the wet particles in water suspension, wetting agents are added to: a. prevent freezing b. prevent corrosion of inspection equipment c. ensure the proper wetting of the part d. decrease the amount of water needed | show 🗑
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| 79. When preparing an inspection bath, the amount of magnetic particles per gallon of fluid is called its: a. measuring scale b. particle number c. strength or concentration d. usable limits | show 🗑
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| 80. Coercive force: a. describes how MT particles are suspended liquid when using wet MT b. describes how MT force used with the continuous method c. represents the reverse MT force used to remove the residual magnetism d. term not used in MT | show 🗑
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| 81. Demagnetization: a. may be accomplished by heating a material above its Curie point b. is always necessary c. can be performed only with AC d. can be performed only with DC | show 🗑
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| 82. Retentivity: a. ability to induce magnetism in a ferromag part b. ability of material to resist creating MT flux within it c. is ability of material to retain a portion of the MT field created after MT force removed d. term not used in MT | show 🗑
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| 83. Resistance to demagnetization is: a. greater in hard materials than soft materials b. greater in soft materials than hard materials c. the same for both hard and soft materials d. nonexistent | show 🗑
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| show | a. may be easy or difficult depending on the type of material
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| show | c. both a and b
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Created by:
urbergpm9276
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