Level I Questions - Magnetic Particle Testing Method PDF

Level I Questions - Magnetic Particle Testing Method 1 Level I Questions Magnetic Particle Testing Method 1. Magnetic particle is a nondestructive 5. Magnetic particles are available in testing method used for: di...

Level I Questions - Magnetic Particle Testing Method 1 Level I Questions Magnetic Particle Testing Method 1. Magnetic particle is a nondestructive 5. Magnetic particles are available in testing method used for: different colors: a. locating surface and near-surface a. for color contrast with the part discontinuities in aluminum surface thereby enhancing detection b. locating surface and near-surface of indications discontinuities in steel b. to enhance the detection of c. finding and measuring material indications by allowing background separation color matching d. measuring flux density c. to determine if an indication is C.2 surface or subsurface d. to indicate different magnetic flux 2. Ferromagnetic material is: values C.180 a. strongly attracted by a magnet b. not highly saturated by magnetic 6. Which of the following can be (t ~ fields c. a material with a 0 permeability magnetized? measurement a. 1ron d. not capable of being magnetized b. copper C.380: E.3 c. aluminum d. magnesium 3. The permeability of a material describes: C.43 a. the ease with which it can be 7. The magnetic field is strongest when: magnetized b. the depth of the magnetic field in the a. the magnetizing voltage is flowing part b. the magnetizing current is flowing c. the length of time required to c. the material exhibits high coercive demagnetize it forces d. the ability to retain the magnetic field d. the magnetizing current is not flowing C.385; E.6 C.54 4. The retentivity of a material describes: 8. If a crack exists in a circular magnet, the attraction of magnetic particles to the a. the ease with which it can be crack is caused by: magnetized b. the depth of the magnetic field in the a. a coercive force part b. a leakage field c. the length of time required to c. a Doppler effect demagnetize it d. a high reluctance at the crack - d. the ability to retain the magnetic field C.49 C.387; E.4 qg QL eg es Pv es 8('; q]; 2 Supplement to Recommended Practice SNT-TC-1A (Q&A Book): Magnetic Particle Testing Method 9. The unit usually used to denote flux 14. The magnitude of the residual magnetic density is: field in a specimen is dependent on: a. tesla a. the length-to-diameter ratio (LID) b. henry b. the strength of the applied c. farad magnetizing force d. ampere c. the right-hand rule C.54 d. the left-hand rule C.54 10. VVhich statement is true when related to magnetic lines of force? 15. The proper number of ampere-turns for a given test specimen being examined by a. they are often forced to cross due to longitudinal magnetism is determined by: part geometry b. they are most dense at the poles of a a. its length and diameter magnet b. the material c. they seek the path of most resistance c. the diameter and the material d. they cannot be detected d. its diameter C.44 A.182 11. Magnetic flux lines that are parallel to a 16. A circular field may be induced into a discontinuity produce: specimen by: a. strong indications a. placing the part in an energized coil b. weak indications b. passing current directly through the c. no indications part d. fuzzy indications c. passing a magnetic field through the C.48 part d. placing the part in a north~south 12. A part is adaptable to magnetic particle orientation inspection if: C.50 a. it is attached to an electrostatic field 17. An electrical yoke produces: b. the material is ferromagnetic c. the material is nonferrous a. a longitudinal field d. the material is an electric conductor b. a circular field C.43 c. alternating fields d. a swinging field 13. What rule describes the direction of C.53: E.27 current flow ( + to -) when lines of magnetic force surround a conductor? 18. An energized coil around the part produces: a. left-hand rule b. right-hand rule a. a circular field c. flux rule b. a longitudinal field d. reluctance rule c. an intermittent field C.50 d. a field dependent on the type of current applied C.51; E.9 on  Level I Questions - Magnetic Particle Testing Method 3 19. In longitudinal magnetization the proper 23. Which of the following is an advantage of term for calculating magnetizing force is: magnetic particle testing over penetrant testing? a. amperes b. ampere-turns a. it does not require post-cleaning of c. watts the part d. ohms b. it requires direct access to the surface A.182 of the part c. it can detect near-surface 20. Magnetic lines of force: discontinuities d. it requires a shorter dwell time to a. travel in straight lines produce results b. form a closed loop A.66 c. are randomly oriented d. overlay in highly ferromagnetic 24. The amount of amperage used for materials magnetic particle inspection using the C.44; E.4 prod metho_d is determined from the: 21. A magnetic particle buildup from a a. type of material discontinuity is strongest when the b. distance between the prods discontinuity is oriented: c. diameter of the part d. total length of the part a. 180 degrees to the magnetic flux flow C.113 b. 45 degrees to the magnetic flux flow c. 90 degrees to the magnetic flux flow 25. The flux within and surrounding a d. 90 degrees to the current flow magnetized part or around a conductor C.48 carrying a current is known as: 22. A specimen may be demagnetized by a. the saturation point which of the following methods? b. a magnetic field c. the ferromagnetic field a. heat treatment below the curie d. the paramagnetic field temperature C.112 b. placing the part in an alternating current coil 26. The areas on a magnetized part from c. placing the part in reversing and which the magnetic field is leaving or decreasing direct current fields returning into the part are called: d. applying a direct current yoke and removing it from the part a. salient points A.66; E.54 b. defects c. magnetic poles d. nodes C.44 27. A metal that is difficult to magnetize is said to have: a. high permeability b. low permeability c. low coercive force d. low retentivity C.56; E.44 qu; qg(; QQ(; 4 Supplement to Recommended Practice SNT-TC-1A (Q&A Book): Magnetic Particle Testing Method 28. The magnetism that remains in a piece of 33. Inspecting a part by magnetizing, magnetizable material after the removing the current flow, then applying magnetizing force has been removed is the medium is called the: called the: a. continuous method a. tramp magnetism b. wet method b. residual magnetism c. residual method c. damped magnetism d. dry method d. permanent magnetism C.63 C. 54 34. Which of the following is the most 29. Subsurface discontinuity indications effective method for the detection of usually appear: near-surface defects? a. sharp and distinct a. dry residual method using DC with b. sharp and wide surge c. wide and fuzzy b. wet continuous method using d. high and loosely held half-wave rectified current 0.35 c. wet residual method d. dry continuous method using 30. Which residual field is most difficult to half-wave rectified current with prods demagnetize? C.i17 a. longitudinal 35. A curve is sometimes drawn to show b. circular graphically the relation of the c. vector magnetizing force to the strength of the d. binodal magnetic field produced in a certain C.281 material. This curve is known as the: 31. Which magnetic particle application a. magnetic force curve technique is the most sensitive? b. hysteresis curve c. saturation curve a. continuous d. induction curve b. residual C.54; E.6 c. interrupted d. counter-current 36. What method of applying particles C.64 provides greater sensitivity in locating subsurface weld discontinuities? 32. Fluorescent magnetic particle indications should be inspected under: a. continuous b. residual a. any light c. circular b. a neon light d. longitudinal c. an ultraviolet light C.180 d. a fluorescent light C.62; E.39 89£ Pt£ 0££ qQ£ 06(': qgc:  Level I Questions - Magnetic Particle Testing Method 5 ;,, ! 3 7. When magnetizing a weld in two 41. The point at which the magnetism in a " directions, and if the current used in the first direction is 750 A and the current in material cannot be increased even though the magnetizing force continues to the second direction is 400 A, which of increase is known as the: the following is true? a. salient pole a. the part should be checked to see if b. saturation point demagnetization between operations c. residual point is necessary d. remnant point b. no precautions should be taken before C.54 the second operation c. this is not a valid technique 42. Which type of current produces a skin d. there is no need to magnetize a weld effect on the surface of the part? in two directions C.278 a. alternating current b. direct current 38. When there is absolutely no pattern or c. half-wave rectified distribution of magnetic particles on the d. full-wave rectified part, the possible cause is that: C.57; E.13 a. the amperage setting is too high 43. When using the wet method, why should b. the amperage setting is too low a high velocity flow of wet method bath c. the particle bath strength is too high over surfaces following removal of the d. the part is made of steel with high magnetizing current not be used? retentivity A.64 a. it may wash away a fine or weakly held indication 39. VVhat are three causes of nonrelevant b. this is not a problem indications? c. it may splash particles into eyes d. none of the above is correct a. lack of fusion, change of section 0.23 thickness, grinding cracks b. change of section thickness, heat 44. Residual magnetic particle inspection affected zones, drilled hole near may be used when: surface c. very high amperage, drilled hole near a. parts are irregular in shape surface, blowholes b. parts are highly retentive d. drilled hole near surface, very high c. parts are highly stressed amperage, lack of fusion d. evaluating continuous method C.217 indications C.63 40. Using the residual test method, a number of parts are magnetized and laid on a rack 45. Magnetic particle inspection is not a prior to application of magnetic particles. reliable method of detecting: Why is it important that they do not rub or touch each other? a. laps b. deep internal cavities a. there is a possible loss of the magnetic c. cracks field d. seams b. it may cause magnetic writing C.28 c. it may damage the part d. it makes parts hard to handle C.217 qsv qvv. 6 Supplement to Recommended Practice SNT-TC-1A (Q&A Book): Magnetic Particle Testing Method 46. The wet fluorescent magnetic particle inspection method is the same as the visible wet magnetic particle method except that the fluorescent magnetic particle inspection method requires: 51. To detect lengthwise discontin11ities on the inside diameter of hollow parts, you should: a. pass current through it b. magnetize with a coil a. an ultraviolet light c. pass current through a central b. a higher current conductor c. a different machine d. increase the amperage used d. alternating current C.120 C.62 52. What equipment is used to determine if a 47. A discontinuity open to the surface part has been demagnetized? produces an indication which is: a. a magnet on the part a. sharp and distinct b. a field indicator b. wide and indefinite c. a survey meter c. crisscrossed d. careful observation for clinging d. high and fuzzy magnetic particles 0.35; E.2 C.289 48. Which of the following will produce 53. Which of the following is most often used circular magnetism? for dry magnetic particle inspection? a. passing current through a coil a. full cycle direct current c. yokes c. high voltage, low amperage current d. passing current through prods d. direct current from electrolytic cells 8.11 C.57 49. When using the wet continuous method, 54. An electric current through a copper the flow of suspension from the hose wire: should be shut off; a. creates a magnetic field around the a. immediately after applying the wire current b. creates magnetic poles in the wire b. immediately before applying the c. magnetizes the wire current d. does not create a magnetic field c. while the current is flowing C.50 d. 30 seconds before applying the current 55. Parts should be cleaned after 8.52 demagnetization: 50. The strongest magnetic field in a coil is at a. to ensure that the magnetic particles the; are re1noved b. to prevent false indications a. outside edge c. to save the solids of the suspension b. inside edge d. to prevent cracking during heat c. center treatment d. end C.278 8.17 egg epg qss qos P817  Level I Questions - Magnetic Particle Testing Method 7 56. In circular magnetization, the 61. When a magnetic field is induced in a magnetizing force is expressed in part with prods spaced !52 mm (6 in.) amperes. What term is used to express apart, the field is: magnetizing force in longitudinal magnetization? a. solenoidal b. circular a. amperes c. longitudinal b. ampere-turns d. distorted trapezoidal c. consequent poles C.53 d. volts D.18 62. Applying the theory of the right -hand rule, a longitudinal surface defect in a 57. A longitudinal surface crack in a round bar is detected by «current passing circularly magnetized part will cause: in a direction parallel to the direction of expected defects" because: a. the magnetic field to die out b. a decrease in permeability a. the current direction is in line with c. a magnetic leakage field the defect d. a current to flow b. the magnetic field is at right angles to C.49 the defect c. it makes no difference 58. In a magnetic particle test, assuming that d. the magnetic field is parallel to the all of the following are in the same relative defect position in a small part, which would be C. 50 the hardest to detect? 63. If a cm;rent is passed through an electrical a. a surface crack conductor, what will surround the b. a near-surface crack conductor? c. a scratch d. a seam a. eddy current field A.62 b. current c. magnetic field 59. If wet magnetic particle suspension is not d. residual field uniform, then: C.50 a. the strength of an indication may 64. With current flowing from+ to- in a vary, and the interpretation of the coil, a longitudinal field is created. Which indication may be erroneous of the following may be used to establish b. the magnetic flux would not be the direction of the magnetic field? uniform c. greater mobility would be required a. left-hand rule d. the part cannot be magnetized b. right-hand rule A.261 c. Ohm's law d. Newton's law 60. Which of the following currents will best C. 50 define surface cracks? a. half-wave rectified alternating current b. direct current c. alternating current d. surge current A.232 009 869 ogg qgg 8 Supplement to Recommended Practice SNTTC-1A (Q&A Book): Magnetic Particle Testing Method 65. When magnetic material is placed into a coil, the magnetic lines of flux concentrate themselves in the material and: a. create a longitudinal magnetic field 70. A major factor that determines the success of magnetic particle inspection is the: a. field strength b. create a circular magnetic field b. voltage on magnetizing coil c. create a longitudinal circular field c. current through the coil d. have no effect d. time of magnetization C.51 C.48-49 66. Which form of magnetization is easiest to 71. What type of current is.best suited to detect in most parts? detect surface discontinuities? a. longitudinal magnetization a. direct current b. permanent magnetism b. alternating current c. circular magnetization c. pulsating direct current d. parallel magnetization d. halfwave C.280 C.57 67. The best type of magnetic field to use to 72. When preparing a magnetic particle bath, inspect a tubular product for surface it is important to have the bath strength at defects along its length is a: a proper level, as too many particles can result in: a. longitudinal field b. circular field a. lowering the test amperage c. swinging field b. having to increase the magnetizing d. yoke magnetization current C.112 c. masking the indications d. none of the above 68. The area of maximum induced field C.188 strength using a yoke is: 73. One advantage of using fluorescent a. at the north pole of the yoke particles is: b. at the south pole of the yoke c. the area directly between the poles a. that less equipment is required d. on the outside of pole pieces b. the high speed of inspection C.53 c. the cost d. that they are more readily attracted 69. The strength of the magnetic field than other particles induced in a part is often referred to as: A.275-276 a. current density 74. When using a dry magnetic particle b. voltage powder, the proper way to apply it to the c. flux density part is to: d. retentivity C.47. 383 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 the inspection surface as gently as possible C.181 PVL eoL 06g ogg egg egg  Level 1Questions - Magnetic Particle Testing Method 9 t 75. When using wet particles in water suspension, wetting agents are added to: 79. Resistance to demagnetization: a. is greater in hard materials than soft a. prevent freezing materials b. prevent corrosion of inspection b. is greater in soft materials than hard equipment materials c. ensure the proper wetting of the part c. is the same for both hard and soft d. decrease the amount of water needed materials C.186 d. is nonexistent C.282 76. When preparing an inspection bath, the amount of magnetic particles per gallon 80. Demagnetization: of fluid is called its: a. may be easy or difficult depending on a. measuring scale the type of material b. particle number b. is easy for materials having a high c. strength or concentration coercive force d. usable limits c. is always most difficult in materials C.188 retaining a high residual field d. all of the above answers are correct 77. Coercive force: C.282 a. describes the means by which the 81. The strength of the wet suspension magnetic particles are suspended in should be maintained at a given level the liquid when using the wet method because: b. describes the magnetizing force used with the continuous method a. a low level may give weak indications c. represents the reverse magnetizing b. a high level may give heavy force necessary to remove the residual background magnetism in a material c. both A and B d. is not a term used in magnetic d. none of the above particle testing C.188 C. 54 82. Indications such as those at local external 78. Demagnetization: poles, sharp fillets or thread roots are called: a. may be accomplished by heating a material above its curie point a. fake indications b. is always necessary b. relevant indications c. can be performed only with c. nonrelevant indications alternating current d. magnetic writing indications d. can be performed only with direct C.216-217 current C.278: E.6 83. Magnetic particle testing will reveal discontinuities in which one of the following materials? a. bronze. b. carbon steel c. aluminum castings d. austenitic stainless steel C.B 808 86L B8L OLL OSL 10 Supplement to Recommended Practice SNT-TC-1A (Q&A Book): Magnetic Particle Testing Method 84. Magnetic particle testing is a nondestructive testing method for detecting discontinuities in magnetizable material. This method can detect: a. surface discontinuities only 88. Nonrelevant indications can be caused by the following, except: a. b. c. excessive magnetizing current inadequate magnetizing current structural design of the test specimen b. subsurface discontinuities only d. variance of permeability within the c. surface and near-surface test specimen discontinuities C.216-217 d. discontinuities at surface and subsurface of any depth 89. A material with magnetic permeability C.S; E.2, 49 less than 1 is known as: 85. Which of the following statements is true a. diamagnetic of magnetic particle testing? b. paramagnetic c. ferromagnetic a. it cannot be utilized to inspect d. panamagnetic through coatings C.45 b. it can be applied only to detect surface defects 90. A small device, generally a metal strip or c. it can be applied only to detect disk, containing an artificial discontinuity subsurface defects used to determine when the correct d. it can be applied to detect surface and magnetizing condition or magnetic field near-surface discontinuities in direction has been achieved is: ferromagnetic material A.66-68; C.8 a. an ohmmeter b. a gauss meter 86. Wbich one of following magnetic c. a flux indicator particles will be most sensitive to small d. a field indicator surface discontinuities such as fatigue C.345, 388 cracks? 91. The direction of magnetic line of force is a. dry powder _ _ degrees from the direction of b. fluorescent particle current flow. c. visible particle using oil as carrier (vehicle) a. 45 d. visible particle using water as carrier b. 90 (vehicle) c. 180 C.222 d. 220 C.50 87. Magnetic particles should have the: a. highest possible retentivity b. lowest possible permeability c. highest possible permeability d. highest possible permeability and lowest possible retentivity C.60 006 868 PL8 P98 ovs  Level II Questions - Magnetic Particle Testing Method :11 Level II Questions Magnetic Particle Testing Method 1. The interpretation of magnetic particle 4. Comparing parts that have been indications may be aided by: circularly magnetized and those that have been longitudinally magnetized, which a. observing with a magnifying glass retain the most objectionable residual b. reproducing the indication after field if not demagnetized? demagnetization c. observing the indications after the a. circular part is pre-cleaned b. vectored d. observing the indications after the c. remnant part is post-cleaned d. longitudinal C.218 A.313 2. Residual magnetism may be beneficial as 5. What type of magnetization uses the an aid: formula: Ampere-turns= 45 000/(L!D)? a. in demagnetization a. circular b. in proper heat treating b. parallel c. in the deposition of weld metal c. vectored d. in interpretation and evaluation of d. longitudinal indications A.182: E.18 A.397 6. VVhy are large soft contact pads such as 3. An interruptiOn in the normal physical lead or copper braid used for surfaces or structure or configuration of a part which headstocks? produces a magnetic particle testing indication is called: a. to increase the contact area and reduce the possibility of burning the a. a defect part b. an indication b. because they help heat metal, thus c. a deformation facilitating magnetic induction d. a discontinuity c. to increase the contact area and flux C.216-217 density d. because of their low melting points C.142 eg PS Pv Pt: Pi': 12 Supplement to Recommended Practice SNT-TC-1A (Q&A Book): Magnetic Particle Testing Method 7. A rough forging that has received no further processing is magnetic particle tested. An indication is observed to run in every direction and appears to extend deeply into the part and perpendicular to 11. When testing for fine shallow surface cracks, the preferred magnetic particle test method should be: a. dry alternating current the surface. It is very sharp. What is the. b. dry direct current probable identity of the indication? c. wet alternating current d. wet direct current a. forging burst C.57, 63 b. flake c. seam 12. Which of the following is an advantage of d. lap the dry method over the wet method? A.85·86 a. it is more sensitive to fine surface 8. A gear with case-hardened ground teeth cracks and hub ends is magnetic particle tested. b. it is easier to use for field inspection Individual indications are detected on with portable equipment five teeth and one end surface of the hub. c. it is faster than the wet method when The indications do not break over the testing a number of small parts part edges. What is the probable identity d. it is more capable of providing full of the indication? surface coverage on irregularly shaped parts a. grinding cracks C.63 b. quench cracks c. inclusions 13. When testing a bar with a length-to- d. porosity diameter ratio of 4 in a 10-turn coil, the A.90·91 required current would be: 9. If an overall pattern (sometimes circular a. 45 OOOA lines) appears on the test surfaces, how b. 18 OOOA should the inspector reprocess the test c. 1125 A piece? d. unknown; more information is needed a. demagnetize the piece A.208 b. retest at a higher amperage c. retest at lower amperage 14. Internal splines and holes drilled parallel d. part is not testable to, or near, test surfaces will cause: A.383 a. sharp, well-defined indications 10. A prime consideration when selecting a directly aligned with the part's powder to be used as a magnetic particle internal contours medium is to select a powder that: b. broad, fuzzy indications directly aligned with the part's internal a. will adhere to the surface being tested contours b. provides a low contrast to the surface c. distinct indications not aligned with being tested any internal contours c. provides a high contrast to the surface d. no indications being tested C.216-217 d. requires a high demagnetization current to remove it C.180 OOT eg  Level II Questions - Magnetic Particle Testing Method :1.3 ~· 15. A limitation of coil magnetization techniques is that: 19. Which of the following wave patterns depicts the wave form of three-phase full-wave rectified alternating current? a. regardless of part size, the part cannot be painted C.58; E.14 b. the coil must be of maximum diameter in relation to the part a. + c. the effective field is generally limited on either side of the coil - - -.c. -~..,...._../ :--,v - ,. -...,.T...." - - Mean DC...., '-------""(I"/ ~ d. small diameter parts must be placed c /\/I {\ 1\ ')' 1-\ (I Volts close to the center of the coil [I;> ~ I 1\1 \1\t \J \1\1 \I\ I ::J A.146 0 Time 1 Cycle 16. Which of the following casting discontinuities is caused by nonuniform cooling resulting in stresses that rupture the surface of the metal? b. + a. hot tears b. porosity c. dross...., c QJ d. shrinkage ~ ~ C.78 ::J 0 I I Time ' -I ' -I 17. The term used to refer to the total t opposition to flow of current represented by the combined effect of resistance, inductance and capacitance of a circuit is: c. + a. inductive reactance b. impedance...., c. reluctance c QJ d. decay ~ ~ ::J A.122 0 Time 18. A desirable property of magnetic particles used for either the dry or wet method is that they: a. be toxic d. + b. be nonferromagnetic c. possess high retentivity d. possess high permeability...., c QJ C.179 ~ ~ ::J 0 Time P8"J: 14 Supplement to Recommended Practice SNT-TC-1A (Q&A Book): Magnetic Particle Testing Method 20. A 3500 ampere-turn coil shot is required to be performed in a S-turn coil after a head shot of 800 A using the wet continuous method. In order to properly conduct the coil shot it is necessary to: 24. A rough forging discontinuity has tJ:e following characteristics: can occur on surface or internally, is associated with low temperature processing, is often caused by excessive working and creates cavities varying in size. How would it be a. demagnetize the part between the identified? head and first coil shot b. check the part for residual magnetism a. pipe with a field indicator b. burst c. remove all residual wet magnetic c. shrinkage particle fluid from the part using d. lamination clean, dry absorbent rags C.78 d. place the part in the coil and continue the inspection after evaluating the 25. Discontinuities in plate, sheet or strip head shot indications caused by internal fissures, inclusions or A.308 blowholes in the original ingot which, after rolling, are usually flat and parallel 21. When adding concentrate in paste form to the outside surface are called: to any wet magnetic particle suspension liquid, it is common practice to: a. laps b. seams a. add the paste directly to the c. cracks suspension liquid d. laminations b. change the entire bath after C.77 thoroughly cleaning the system ' c. make a small, slurry-like test mixture 26. Forging laps occur in what relation to the ~· of paste and suspension and add axial direction of a part? directly to the bath d. mix paste in a small container with a. they are always found on thermal suspension to the required bath centerline strength and add directly to the bath b. they are found on the surface of a part A.264 at a 90-degree angle to the long axis c. they may occur anywhere in the part 22. Which of the following can cause and always run in the direction of nonrelevant magnetic particle working indications? d. they may occur anywhere on the surface and may bear no relation to a. joints between dissimilar metals the axial direction of the part b. thread cracks A.86 c. scratches d. burrs 27. The accumulation of particles at a site on C.216·218 the part surface, collected at and held to the site by the magnetic leakage field, is 23. External poles which are too strong to called: permit good inspection of a part are more likely to result when using: a. a defect b. an indication a. longitudinal magnetization c. a discontinuity b, polarized magnetization d. magnetic writing c. residual magnetization 0.33; E.2 d. circular magnetization A.382 P9