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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| show | c. both a and b
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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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| show | c. both a and b
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| show | d. all of the above
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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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| show | a. Gauss
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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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| show | b. the material is ferromagnetic
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| 13. What rule describes the direction of current flow (+ to —) when lines of magnetic force surround a conductor? a. the left hand rule b. the right hand rule c. the flux rule d. the reluctance rule | show 🗑
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| 14. The magnitude of the residual magnetic field in a specimen is dependent on the: a. L/D ratio (length to diameter) b. strength of the applied magnetizing force c. right hand rule d. left hand rule | show 🗑
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| 15. The proper number of ampere-turns for a given test specimen is determined by: a. its length b. the material c. both a and b d. it's diameter | show 🗑
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| show | d. all of the above
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| show | a. a longitudinal field
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| show | b. a longitudinal field
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| 19. In longitudinal magnetization, the proper term for calculating magnetizing force is: a. amperes b. ampere-turns c. watts d. ohms | show 🗑
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| show | b. form a closed loop
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| 21. A magnetic particle build-up from a discontinuity is strongest when the discontinuity is oriented: a. 180° to the magnetic field b. 45° to the magnetic field c. 90° to the magnetic field d. 90° to the current flow | show 🗑
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| 22. A specimen may be demagnetized by: a. heat treatment above Curie temperature b. an AC coil c. reversing DC fields d. all of the above | show 🗑
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| show | d. all of the above
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| 24. The amount of amperage used for magnetic particle inspection using the prod method is determined from the: a. type of material b. distance between the prods c. diameter of the part d. total length of the part | show 🗑
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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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| show | b. low permeability
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| 28. The magnetism that remains in a piece of magnetizable material after the magnetizing force has been removed is called the: a. tramp field b. residual field c. damped field d. permanent field | show 🗑
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| show | d. all of the above
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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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| show | b. circular
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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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| 33. Which type of current brings out surface indications most clearly? a. AC b. DC c. pulsed DC d. DC with surge | show 🗑
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| 34. Fluorescent magnetic particle indications should be inspected under: a. fluorescent light b. any light c. black light d. neon light | show 🗑
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| show | c. residual method
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| show | d. none of the above
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| 37. Most effective method to detect extremely deep lying defects? a. dry residual method using DC with surge b. wet continuous method using half-wave rectified current c. wet residual method d. dry continuous method using prods with HWRC | show 🗑
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| show | b. hysteresis curve
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| show | a. continuous
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| show | a. check if demag needed between exams
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| show | d. any of the above could be true
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| 42. What are the three causes of nonrelevant indications? a. lack of fusion, change of section , grinding cracks b. change of section , high amperage, hole drilled near surface c. high amperage, hole drilled near surface, blow holes d. drilled | show 🗑
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| show | b. it may cause magnetic writing
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| show | b. saturation point
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| 45. Which type of current has a "skin effect"? a. AC b. DC c. half-wave rectified d. full-wave rectified | show 🗑
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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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| 47. Residual magnetic particle inspection may be used when: a. parts are irregular in shape b. parts are highly retentive c. parts are highly stressed d. evaluating continuous method indications | show 🗑
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| show | b. deep seated cavities
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| show | a. black light
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| 50. A defect open to the surface produces an indication that is: a. sharp and distinct b. wide and indefinite c. criss-cross d. high and fuzzy | show 🗑
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| show | c.passing current through prods
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| show | c. while the current is flowing
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| show | b. inside edge
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| 54. To detect lengthwise defects on the inside diameter of a hollow part, you should: a. pass current through it b. magnetize it with a coil c. pass current through a central conductor d. increase the amperage used | show 🗑
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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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| 56. Which of the following is most often used for dry magnetic particle inspection? a. full cycle direct current b. half-wave rectified alternating current c. high voltage, low amperage current d. direct current from electrolytic cells | show 🗑
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| show | a. creates a magnetic field around the wire
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| show | a. to assure that the magnetic particles are removed
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| 59. In circular magnetization, the magnetizing force is expressed in amperes. What term is used to express the magnetizing force in longitudinal magnetization? a. amperes b. ampere-turns c. consequent poles d. volts | show 🗑
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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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| show | c. AC
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| 64. When a magnetic field is induced in a part with prods 70. spaced 152 mm (6 in.) apart, the field is: a. solenoidal b. circular c. longitudinal d. distorted trapezoidal | show 🗑
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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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| show | c. a magnetic field
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| 67. With coil current flowing from + to —, a longitudinal field is created. Which of the following may be used to establish the direction of the magnetic field? a. the left hand rule b. the right hand rule c. Ohm’s law d. there is no relevant law | show 🗑
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| 68. When ferromag material is placed into a coil, the magnetic lines concentrate themselves in the material and: a. create a longitudinal magnetic field b. create a circular magnetic field c. create a longitudinal-circular field d. have no effect | show 🗑
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| show | c. circular magnetization
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| 70. When inspecting a tabular product for surface defects along its length, the best type of magnetic field to use is a: a. longitudinal field b. circular field c. swinging field d. yoke magnetization | show 🗑
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| show | c. the area directly between the poles
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| 72. The strength of the magnetic field induced in a part is often referred to as: a. current density b. voltage c. flux density d. retentivity | show 🗑
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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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| 75. When preparing MT bath, it is important to have the proper concentration bath strength as excess particles can result in: a. lowering test amperage b. need to increase the magnetizing current c. the masking of indications d. none of the above | show 🗑
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| 76. One advantage of using fluorescent particles is a. that less equipment is required b. the high speed of inspection c. the cost d. that they are more readily attracted | show 🗑
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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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| show | c. ensure the proper wetting of the part
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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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| show | c. represents the reverse MT force used to remove the residual magnetism
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| show | a. may be accomplished by heating a material above its Curie point
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| show | c. is ability of material to retain a portion of the MT field created after MT force removed
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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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| 85. The strength of the wet suspension should be maintained at a given level because: a. a low level might give a weak indication b. a high level may give a heavy background c. both a and b d. none of the above | show 🗑
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urbergpm9276
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