Electromagnetic Testing - Q&A 001.pdf

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26. Which of the following will affect the impedance of an encircling eddy currenttest probe?A. Conductivity Of A Test Specimen In The CoilB. Permeability Of A Test Specimen In The CoilC. Fill FactorD. All Of The Above27. When a test coil consists of a double winding arrangement, and one windingis referred to as a primary winding, the other winding is referred to as the:A. Absolute WindingB. Secondary WindingC. Phase WindingD. None Of The Above28. Eddy current test coils which are wound to form a wide coil would normally beused to detect:A. PittingB. Small InclusionsC. Change In ConductivityD. PorosityCharlie Chong/ Fion Zhang
29. Eddy current test coils, which are wound to form a narrow coil, wouldnormally be used to detect:A. Slow Changes In DimensionsB. Gradual Changes In ConductivityC. Variation In Heat TreatmentD. Small Surface Defects30. Direct current saturation coils would most likely be used when testing:A. SteelB. AluminumC. CopperD. Brass31. The single absolute coil arrangement can be used in:A. Encircling Coil OnlyB. Probe Coils OnlyC. Probe And Encircling Coils OnlyD. Probe, Encircling, And Inside Diameter CoilsCharlie 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 and 22: Level I Q&ACharlie Chong/ Fion Zhan
Page 23 and 24: 1. A test specimen used as a basis
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: 1. C 2. D 3. B 4. D 5. C 6. A 7. B
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 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
Page 75 and 76: LessonLearnedCharlie Chong/ Fion Zh
Page 77 and 78: Eddy Current Testing Level I (20 Qu
Page 79 and 80: Q.4 Eddy currents generated in a te
Page 81 and 82: Q.10 A "spinning probe" would most
Page 83 and 84: Q.16 A hybrid coil is composed of t
Page 87 and 88: Level II Q&ATWOCharlie Chong/ Fion
Page 89 and 90: 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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Page 233 and 234:
Recalling the mistakesCharlie Chong
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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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