Electromagnetic Testing - Q&A 001.pdf

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39. Disadvantages of using a surface probe coil for the inspection of smalldiameter tubing include:a. inability to detect small discontinuitiesb. slow inspection speedc. inherent mechanical problemsd. both a and ce. both b and cCharlie Chong/ Fion Zhang
40. Differential coil systems can be of which of the following types? (seeFigure 15)a. sketch no. 1b. sketch no. 2 (reflection differential coils)c. sketch no. 3d. all of the abovee. both a and bFigure 15Charlie Chong/ Fion Zhang
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Electromagnetic TestingQuestions &
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Petrochemical ApplicationsCharlie C
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GreekAlphabetCharlie Chong/ Fion Zh
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Charlie Chong/ Fion Zhang
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Fion Zhang at Shanghai10th April 20
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My MangoesCharlie Chong/ Fion Zhang
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Keys:1. A test specimen used as a b
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Level I Q&ACharlie Chong/ Fion Zhan
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1. A test specimen used as a basis
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7. When conducting an eddy current
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FIGURE 8-45 Effect of test variable
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13. The conductivity of a material
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16. When testing plate with a probe
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22. When testing tubing with an ins
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Eddy Current Bobbing CoilCharlie Ch
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25. An increased in the impedance o
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1. C 2. D 3. B 4. D 5. C 6. A 7. B
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29. Eddy current test coils, which
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35. Reference standards used for ed
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38. Which of the following is not a
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74. Material must be reasonably cen
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47. All ferromagnetic materials tha
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Recalling the mistakesCharlie Chong
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57. Eddy current test techniques ca
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63. When sorting a known mix of two
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69. Nondestructive tests are common
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74. Material must be reasonably cen
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76. An eddy current system (60 cycl
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82. A spinning probe eddy current i
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88. In a feed through encircling co
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94. A symbol commonly used to expre
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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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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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Figure 4Charlie Chong/ Fion Zhang
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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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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
Page 149 and 150: 63. The ratio of the specific diame
Page 151 and 152: 69. A term used to define a propert
Page 153 and 154: 74. An eddy current test coil’s m
Page 155 and 156: 76. When a nonmagnetic rod is place
Page 157 and 158: 82. Which of the following material
Page 159 and 160: 84. The two voltages (V1 and V2) in
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Page 163 and 164: 91. The impedance of a test coil us
Page 165 and 166: 94. When electrical current in an e
Page 167 and 168: 97. To be useful, limit frequency e
Page 169 and 170: 103. The actual frequencies used in
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Page 173 and 174: Level III - Q&A1. b 2. c 3. d 4. b
Page 175 and 176: Q3. A calibration standard may be u
Page 177 and 178: Figure 9Charlie Chong/ Fion Zhang
Page 179 and 180: Q9. In eddy current testing of ferr
Page 181 and 182: Q13. Lift-off certainly reduces the
Page 183 and 184: 17. When inspecting material with e
Page 185 and 186: 21. The reactance component is decr
Page 187 and 188: 22. Test coils may be shielded with
Page 189 and 190: 25. The test coil excitation curren
Page 191 and 192: 28. Which of the following is not a
Page 193 and 194: 31. An ac current produces eddy cur
Page 195 and 196: 33. Thin-walled tubes should be tes
Page 197 and 198: 35. Figure 13 indicates that the ma
Page 199: 37. An operating frequency of 100kH
Page 203 and 204: 43. In a test coil system, when the
Page 205 and 206: 46. In modulation analysis, the typ
Page 207 and 208: 49. In the ellipse method, the foll
Page 209 and 210: 51. In cathode ray tube ellipse tes
Page 211 and 212: A dimension change will not noticab
Page 213 and 214: 52. Eddy current test instruments t
Page 215 and 216: 56. A primary-secondary coil inspec
Page 217 and 218: 59. A probe coil inspection system
Page 219 and 220: 63. A major limitation of modulatio
Page 221 and 222: 67. Impedance changes produced by s
Page 223 and 224: 71. Mutual inductance describes:a.
Page 225 and 226: 75. Referring to Figure 17, suppose
Page 233 and 234: Recalling the mistakesCharlie Chong
Page 235 and 236: Flux Leakage Testing MethodCharlie
Page 237 and 238: Level I - Standard Answers1. c 2. a
Page 239 and 240: 2. What will be the relative flux l
Page 241 and 242: 4. Flux leakage may occur at a surf
Page 243 and 244: Rotational Transverse Magnetization
Page 245 and 246: 8. Using Figure FL-2, what is the v
Page 247 and 248: 9. In circular magnetization, the r
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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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