1. Prods are being used to magnetize a weld area. When dry powder is dusted on the surface, it is observed that there is no mobility of the particles. What is the most probable reason for this observation?
Correct : D. All of the above are possible reasons
2. The current from portable high amperage units can be applied to the object using:
Correct : D. All of the above
3. How can parts be tested to determine if they have been adequately demagnetized?
Correct : C. By using a small magnetometer held at a corner of the part
4. The statement ‘magnetic particle testing can be applied to plated and painted parts’.
Correct : A. May be true depending upon the thickness of the coating
5. A group of indications, some sharp and some broad and fuzzy, were found on an area of a small forging. Demagnetization and re-inspection eliminated these indications. What was the probable cause?
Correct : B. Magnetic writing
6. Magnetic particle testing is most likely to find subsurface discontinuities in:
Correct : A. Soft steels with high permeability
7. Which of the following is not an advantage of Magnetic Particle testing?
Correct : C. Most reliable for finding surface cracks in all types of material
8. The most effective NDT method for locating surface cracks in ferromagnetic materials is:
Correct : C. Magnetic particles testing
9. Opposition to establishment of a magnetic field in a test piece is called:
Correct : A. Reluctance
10. A leakage field is strongest when a discontinuity interrupts the magnetic flux lines at
an angle of:
Correct : C. 90o
11. A common rule of thumb to use for current required in circular magnetisation:
Correct : A. 1000 amps/25 mm of diameter
12. The formula, NI = 45000/(L/D), is used to calculate the proper magnetising current
for:
Correct : D. Coil magnetization
13. For direct contact magnetising methods, the magnetic field is oriented in what
direction relative to the current direction?
Correct : C. At 90o
14. For direct contact magnetising methods, current should be flowing in what direction
relative to expected discontinuities?
Correct : A. Parallel
15. What is the magnetic field strength at the surface of a 25 mm diameter bar as compared
to that at the surface of a 50 mm diameter bar, each carrying 1000 amps of current?
Correct : A. Twice
16. Demagnetization, ASTM E709-95 recommends a coil of ampere-turns:
Correct : C. 5000 to 10000
17. According to ASTM E709-95 when dry particles are used magnetic particle testing shall
not be performed on the surface of parts whose temperature exceeds:
Correct : A. 57ºC
18. According to ASTM E709-95 in using prod technique, prod spacing shall not exceed:
Correct : D. 200 mm
19. According to ASTM E709-95, the UV intensity shall not be less than:
Correct : C. 800 µW/cm2
20. According to ASTM E709-95 in using prod technique on a 50 mm thickness plate with
a prod spacing of 101 mm (4 inches), current shall be selected in the following range:
Correct : A. 300-450A
21. According to ASMT E709-95 alternating current electromagnetic yokes should give a
lifting force of at least:
Correct : D. 4.5 kg
22. According to ASTM E709-95 direct current electromagnetic yokes should have a lifting
force of at least:
Correct : D. 18 kg
23. According to ASTM E709-95 the UV light shall be centred on (1 Å = 10-10m):
Correct : D. 3650 Å
24. According to ASTM E709-95 when fluorescent particles are used, the UV light
intensity shall be above:
Correct : D. 1000 µW/cm2
25. According to ASTM E709-95 when fluorescent particles are used, the bulb shall be
warmed up prior to use for at least:
Correct : D. 4 min
26. According to ASTM E709-95 with prod technique, the prods shall be tipped if the
open circuit voltage is over:
Correct : D. 25 V
27. According to ASME Section VIII, a linear indication is defined as an indication in
which the length is equal to or greater than the width by a factor of:
Correct : C. 3
28. According to ASTM E709-95 the viscosity limit (measured in centi Stokes) of the wet
medium (conditioned water) should not exceed:
Correct : C. 6 cSt
29. According to ASTM E709-95 when applying fluorescent magnetic particles technique,
the operator shall be in darkness area at least......................prior to examination:
Correct : B. 3 min
30. According to ASTM E709-95 the alkalinity of conditioned water shall not exceed:
Correct : B. 10.5 pH
31. According to ASTM E709-95, with wet continuous magnetization technique, the
duration of magnetization current is of the order of:
Correct : A. 0.5 sec
32. According to ASTM E709-95 in using prods having a spacing of 19 mm (3/4 inches)
and above, the magnetizing current shall be:
Correct : B. From 100 to 125 A/25 mm (1 inch)
33. According to ASTM E709-95 powder shall be applied upon the part to be tested in
such a manner that:
Correct : A. A light uniform coating is formed
34. According to ASTM E709-95 before turning off current and examination, dry powder
in excess shall be:
Correct : D. None of the above
35. According to ASTM E709-95 demagnetization can be performed by:
Correct : C. All of the above
36. According to ASTM E709-95, Table 3., alternating current electromagnetic yokes
must have a lifting force of at least:
Correct : D. 4.5 kg (10 lb)
37. According to ASTM E709-95, Table 3., direct current electromagnetic yokes must
have a lifting force of at least:
Correct : D. 18 kg (40 lb)
38. According to API, the acceptable particle concentration of wet particle solution for
fluorescent particles is:
Correct : A. 0.1 to 0.4 mL by volume
39. According to API, the particle concentration of wet particle solution must be checked:
Correct : A. Prior to each shift
40. According to ASTM E709-95 and API, the UV intensity measured at a minimum of 38
cm (15 inches) at least shall not be less than:
Correct : D. 1000 µW/cm2
41. According to ASTME 709-95 and API, in order to eliminate all contaminants, an appropriate cleaning shall be performed on all the surfaces to be examined and on a minimum of adjacent material:
Correct : A. 25.4 mm (1 inch)
42. According to ASTM E709-95 and API, the temperature of the dry particles can be usable
up to:
Correct : D. 315ºC
43. According to ASTM E709-95 and API, the thickness of non conductive coatings will
not exceed:
Correct : C. 0.02-0.05 mm
44. According to ASTM E709-95 and API, relevant indications are produced by:
Correct : C. Leakage fields
45. According to ASTM E709-95 and API, when fluorescent particles are used, the UV
bulb shall warm up prior to use for at least:
Correct : D. 5 minutes
46. According to AST M E709-95 and API, after removing magnetization of parts after
examination, the residual magnetism shall not exceed (1 gauss = 0.0001 tesla):
Correct : A. 3 × 10-4T (3gauss)
47. According to ASTM E709-95 and API, a linear indication is defined as an indication
in which the length is equal to or greater than the width by a factor of:
Correct : C. 3
48. According to API, a non- relevant indication is defined as an indication which in the major dimension is equal to, or less than:
Correct : A. 1.59 mm (1/16 inches)
49. Which of the following types of intensifying screens are not used in industrial
radiography?
Correct : C. Silver halide
50. Betatrons are used to produce X rays in what range?
Correct : A. Several MeV
51. Which of the following is an isotope not artificially produced for industrial use:
Correct : B. Ra-226
52. One half value layer of lead for Iridium-192 is approximately:
Correct : B. 4 mm
53. One half value layer of lead for Cobalt-60 is approximately:
Correct : A. 12 mm
54. The film processing step in which the undeveloped silver bromide is removed from
the film emulsion is called:
Correct : A. Development
55. A radiation producing device which emits radiation of one or a few discreet
wavelengths is:
Correct : C. A gamma ray source
56. The intensifying action of lead screens is caused by:
Correct : D. Electron emission
57. Most of the energy applied to an X ray tube is converted into:
Correct : C. Heat
58. Radiography of tubular sections using a double wall, double viewing technique is
mainly applicable to sections:
Correct : B. 88 mm in diameter or less
59. Which of the following is the most common method of packaging film?
Correct : D. All of the above
60. Which of the following types of radiation is particulate?
Correct : C. Alpha
61. Most scattered radiation which adversely affects the radiographic image quality
originates:
Correct : A. From floors and walls adjacent to the test piece
62. An effect of scattered radiation is to:
Correct : B. Diminish contrast, detail and clarity of radiographic image
63. What is the most important factor in determining the archival quality of radiographic
film?
Correct : C. Degree of removal of fixer residues during washing
64. Radiographic enlargement to distinguish small defects is possible:
Correct : A. Only with a very small source or focal spot size radiation source
65. A detrimental effect of fluorescent screens might be:
Correct : B. Screen mottle
66. The penetrating power of an X ray machine is indicated by:
Correct : B. Tube voltage
67. Reticulation may be the result of:
Correct : D. Developing solutions not maintained at the same temperatures.
68. The main advantage of having small focal spot on an X ray tube is:
Correct : D. A smaller focal spot allows sharper radiographic images than does a larger
69. Cobalt-60 is produced by:
Correct : B. Neutron capture by Cobalt-59
70. For a particular isotope, gamma radiation intensity is determined by:
Correct : C. Source strength in curies
71. Which of the following statements should be true to achieve the highest level of
radiographic sharpness (definition)?
Correct : D. All of the above
72. Thicker materials would normally be inspected using:
Correct : C. Higher kV X rays
73. Another name for a penetrameter is:
Correct : B. Image quality indicator
74. The silver nitrate spot test can be used to:
Correct : A. Check the film for film quality
75. The difference in densities seen on a radiograph due to section changes in an item is:
Correct : C. Subject contrast
76. Which type of film would exhibit the coarsest grain?
Correct : C. Fast
77. An advantage of a gamma ray source is:
Correct : B. Outside power is normally not required
78. Higher X ray tube voltages result in:
Correct : A. Shorter wavelengths X rays
79. A casting flaw which is formed when two masses of molten metal flowing from
different directions flow together, but fail to fuse, is called:
Correct : D. A cold shut
80. X rays are produced by:
Correct : B. The rapid deceleration of electrons
81. Which of the following is a function of lead screens?
Correct : C. To reduce exposure time
82. A silver nitrate spot test might be used to:
Correct : A. Check for archival film quality
83. A linear accelerator is used to produce X rays having energy in the range of:
Correct : A. Several MeV
84. How is the wavelength of scattered radiation compared to the primary beam?
Correct : A. Longer than the wavelength of the primary beam
85. Which of the following viewing conditions is most desirable for interpreting radiographic film?
Correct : A. Brightness of surroundings approximately the same as the area of interest on the radiograph
86. Pinhole radiography would be used to:
Correct : B. Determine focal spot size
87. A straight, dark line in the centre of the film of a weld cap would probably be:
Correct : D. A linear crack
88. Which one of the following steps is necessary to dissolve the undarkened silver salt
crystals in the film emulsion:
Correct : B. Fixing
89. Approximately what energy X ray machine would be required to have penetrating
power equivalent to a Cobalt-60 source:
Correct : B. 1.2 MeV
90. The normal range of steel that is radiographed using Ir-192 is:
Correct : B. 25 mm – 75 mm
91. The focal spot size of an X ray machine must be known in order to determine:
Correct : A. The geometric unsharpness
92. X ray intensity is a function of :
Correct : A. Cathode current
93. What is the minimum age in years at which a person may perform radiography :
Correct : B. 18
94. A densitometer is an instrument that measures:
Correct : C. Radiographic density
95. Which of the following is the correct formula to use for calculating geometric unsharpness if F=source size, T=specimen thickness, D=source to object distance and Ug=geometric unsharpness:
Correct : C. Ug = FT/D
96. A wetting agent is used in film processing to:
Correct : B. Prevent formation of water marks during the drying stage
97. Film intensifying screens are normally used to:
Correct : A. Decrease exposure time
98. A radiation producing device which emits a broad spectrum of wavelengths is:
Correct : B. An X ray machine
99. Which of the following represent types of radiation stemming from radioactive decay :
Correct : A. Alpha, beta, gamma
100. Explain the difference between X and gamma rays:
Correct : C. X rays are produced electrically; gamma rays are emitted by disintegrating atomic nuclei