Electromagnetic Testing - Q&A 001.pdf

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Level I - Standard Answers1. C 2. D 3. B 4. D 5. C 6. A 7. B 8. A 9. A 10. A 11. D 12. B 13. D 14. C 15. D16. B 17. A 18. C 19. C 20. B 21. B 22. D 23. A 24. C 25. B26. D 27. B 28. C 29. D 30. A 31. D 32. B 33. D 34. C 35. D 36. B 37. A 38. D39. A 40. B 41. B 42. C 43. D 44. B 45. D 46. A 47. B 48. C 49. D 50. B51. B 52. C 53. B 54. D 55. B 56. C 57. D 58. B 59. B 60. A 61. C 62. C 63. B64. C 65. B 66. D 67. B 68. A 69. D 70. B 71. A 72. D 73. C 74. B 75. A76. D 77. C 78. D 79. B 80. A 81. B 82. C 83. B 84. A 85. A 86. A 87. B 88. C89. C 90. B 91. D 92. B 93. D 94. B 95. A 96. A 97. C 98. D 99. CCharlie Chong/ Fion Zhang
1. A test specimen used as a basis for calibrating test equipment or as a comparisonwhen evaluating test results is referred to as a:A. Null‐BalancerB. Phase ShifterC. Reference StandardD. High Pass Filter2. In an eddy current testing situation, which of the following can provide sources ofnoise?A. Instrumentation Electronic CircuitsB. Nonspecific Variations With The Test ObjectC. Electrical interferenceD. All Of The Above3. The ratio of the response or amplitude from signals of interest to the response oramplitude of the indications that contain no useful information for the test beingconducted is referred to as:A. Poisson’s RatioB. Signal To Noise RatioC. The Conductivity To Permeability RatioD. The Reactance To Resistance Ratio X L/R ?Charlie Chong/ Fion Zhang
Page 1 and 2: Electromagnetic TestingQuestions &
Page 3 and 4: Petrochemical ApplicationsCharlie C
Page 11 and 12: GreekAlphabetCharlie Chong/ Fion Zh
Page 13 and 14: Charlie Chong/ Fion Zhang
Page 15 and 16: Fion Zhang at Shanghai10th April 20
Page 17 and 18: My MangoesCharlie Chong/ Fion Zhang
Page 19 and 20: Keys:1. A test specimen used as a b
Page 21: Level I Q&ACharlie Chong/ Fion Zhan
Page 25 and 26: 7. When conducting an eddy current
Page 27 and 28: FIGURE 8-45 Effect of test variable
Page 29 and 30: 13. The conductivity of a material
Page 31 and 32: 16. When testing plate with a probe
Page 33 and 34: 22. When testing tubing with an ins
Page 35 and 36: Eddy Current Bobbing CoilCharlie Ch
Page 37 and 38: 25. An increased in the impedance o
Page 39 and 40: 1. C 2. D 3. B 4. D 5. C 6. A 7. B
Page 41 and 42: 29. Eddy current test coils, which
Page 43 and 44: 35. Reference standards used for ed
Page 45 and 46: 38. Which of the following is not a
Page 47 and 48: 74. Material must be reasonably cen
Page 49 and 50: 47. All ferromagnetic materials tha
Page 51 and 52: Recalling the mistakesCharlie Chong
Page 53 and 54: 51. Which of the following is not a
Page 55 and 56: 57. Eddy current test techniques ca
Page 57 and 58: 63. When sorting a known mix of two
Page 59 and 60: 69. Nondestructive tests are common
Page 61 and 62: 74. Material must be reasonably cen
Page 63 and 64: Recalling the mistakesCharlie Chong
Page 65 and 66: 76. An eddy current system (60 cycl
Page 67 and 68: 82. A spinning probe eddy current i
Page 69 and 70: 88. In a feed through encircling co
Page 71 and 72: 94. A symbol commonly used to expre
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Recalling the mistakesCharlie Chong
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LessonLearnedCharlie Chong/ Fion Zh
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Eddy Current Testing Level I (20 Qu
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Q.4 Eddy currents generated in a te
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Q.10 A "spinning probe" would most
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Q.16 A hybrid coil is composed of t
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Level II Q&ATWOCharlie Chong/ Fion
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Level II - Q&A1. A 2. D 3. A 4. B 5
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High Pass Filter 高 “ 通 ”
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7. The fill factor when a 13 mm (0.
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13. A term used to define two or mo
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Residual Magnetism - Retentivity, R
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Rare Earth MagnetsThe permanent mag
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Charlie Chong/ Fion Zhang
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19. The term used to define the val
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Self Inductance of a CoilInductance
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Note: Subsurface indication lag the
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In eddy current testing, what is im
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Phase lag is an important parameter
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25. If the characteristic frequency
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Another inconvenience that arises d
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More Reading on Phase Analysis - Fl
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Level II - Q&A1. A 2. D 3. A 4. B 5
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Magnetic Domain - Hysteresis CurveC
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31. The abscissa values on the impe
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Figure 4Charlie Chong/ Fion Zhang
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36. Which of the following would be
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ωLo = E o , for ωL = E img , R =
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41. A term used to define a system
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47. The magnetizing force of an edd
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Shielded and unshielded probesProbe
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51. Which of the following is not a
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RL CircuitCharlie Chong/ Fion Zhang
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Oscillation in LC CircuitCharlie Ch
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57. It is frequently possible to se
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63. The ratio of the specific diame
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69. A term used to define a propert
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74. An eddy current test coil’s m
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76. When a nonmagnetic rod is place
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82. Which of the following material
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84. The two voltages (V1 and V2) in
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91. The impedance of a test coil us
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94. When electrical current in an e
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97. To be useful, limit frequency e
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103. The actual frequencies used in
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Level III - Q&A1. b 2. c 3. d 4. b
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Q3. A calibration standard may be u
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Q9. In eddy current testing of ferr
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Q13. Lift-off certainly reduces the
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17. When inspecting material with e
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21. The reactance component is decr
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22. Test coils may be shielded with
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25. The test coil excitation curren
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28. Which of the following is not a
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31. An ac current produces eddy cur
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33. Thin-walled tubes should be tes
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35. Figure 13 indicates that the ma
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37. An operating frequency of 100kH
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40. Differential coil systems can b
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43. In a test coil system, when the
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46. In modulation analysis, the typ
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49. In the ellipse method, the foll
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51. In cathode ray tube ellipse tes
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A dimension change will not noticab
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52. Eddy current test instruments t
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56. A primary-secondary coil inspec
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59. A probe coil inspection system
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63. A major limitation of modulatio
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67. Impedance changes produced by s
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71. Mutual inductance describes:a.
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75. Referring to Figure 17, suppose
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Flux Leakage Testing MethodCharlie
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Level I - Standard Answers1. c 2. a
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2. What will be the relative flux l
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4. Flux leakage may occur at a surf
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Rotational Transverse Magnetization
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8. Using Figure FL-2, what is the v
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9. In circular magnetization, the r
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13. The curve shown in Figure FL-3
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PermittivityIn electromagnetism, ab
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17 The optimum angle at which the m
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Level II - Standard Answers1. D 2.
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3. The best flaw detection sensitiv
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6. Using Figure FL-5, flux leakage
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8. What particular type of defect i
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Grain Boundary CrackCharlie Chong/
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12. Due to the unique construction
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16. The point (P) shown on the hyst
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18. A calibration standard is prepa
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22. In the examination of tubular p
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24. Calibration standards used in t
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Level III Q&A-Flux Leakage Testing
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1. In flux leakage testing of wire
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3. Which devices are used to detect
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5. In a properly operating flux lea
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7. Eddy current shielding, the name
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9. A flux leakage pipe inspection s
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12. Too high a rotational test spee
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14. A tube is magnetized by passing
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Circular Magnetic Fields Distributi
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Circular Magnetic Fields Distributi
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MFL of Wire Rope Principle• the a
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A magnetic field is the magnetic ef
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Gauss (Magnetic Flux Density)gauss,
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Magnetic Permeability (B/H)In elect
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19. A ferromagnetic part can be dem
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20. Figure FL-14 shows an arrangeme
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Good LuckCharlie Chong/ Fion Zhang
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