2385961
Descripción
Test por ETSI Daniel Gomez , actualizado hace más de 1 año
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Creado por ETSI Daniel Gomez
hace más de 9 años
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Pregunta 1
Pregunta
1. Which of the following types of intensifying screens are not used in industrial radiography?
Respuesta
-
(a) Lead
-
(b) Fluorescent
-
(c) Silver halide
-
(d) All of the above
Pregunta 2
Pregunta
2. Betatrons are used to produce X rays in what range?
Respuesta
-
(a) Several MeV
-
(b) 50-500 keV
-
(c) 500-1000 keV
-
(d) 0-50 keV
Pregunta 3
Pregunta
3. Which of the following is an isotope not artificially produced for industrial use:
Respuesta
-
(a) Ir-192
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(b) Ra-226
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(c) Co-60
-
(d) All of the above
Pregunta 4
Pregunta
4. One half value layer of lead for Iridium-192 is approximately:
Respuesta
-
12 mm
-
4 mm
-
2 mm
-
25 mm
Pregunta 5
Pregunta
5. One half value layer of lead for Cobalt-60 is approximately:
Respuesta
-
12 mm
-
6 mm
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2 mm
-
25 mm
Pregunta 6
Pregunta
6. The film processing step in which the undeveloped silver bromide is removed from the film emulsion is called:
Respuesta
-
Development
-
Stop bath
-
Fixing
-
Rinsing
Pregunta 7
Pregunta
7. A radiation producing device which emits radiation of one or a few discreet wavelengths is:
Respuesta
-
An X ray machine
-
A linear accelerator
-
A gamma ray source
-
A betatron
Pregunta 8
Pregunta
8. The intensifying action of lead screens is caused by:
Respuesta
-
Secondary X ray emission
-
Secondary gamma ray emissions
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Fluorescence of lead screens
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Electron emission
Pregunta 9
Pregunta
9. Most of the energy applied to an X ray tube is converted into:
Respuesta
-
X rays
-
Light
-
Heat
-
Ultraviolet radiation
Pregunta 10
Pregunta
10. Radiography of tubular sections using a double wall, double viewing technique is mainly applicable to sections:
Respuesta
-
Over 38 mm in diameter
-
88 mm in diameter or less
-
125 mm in diameter and less
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Under 25 mm in diameter
Pregunta 11
Pregunta
11. Which of the following is the most common method of packaging film?
Respuesta
-
(a) Individual sheets for use in cassettes
-
(b) Rolls
-
(c) Pre-packaged (‘day-pack’)
-
(d) All of the above
Pregunta 12
Pregunta
12. Which of the following types of radiation is particulate?
Respuesta
-
(a) X
-
(b) Gamma
-
(c) Alpha
-
(d) None of the above
Pregunta 13
Pregunta
13. Most scattered radiation which adversely affects the radiographic image quality originates:
Respuesta
-
(a) From floors and walls adjacent to the test piece
-
(b) From other nearby objects
-
(c) From the test piece itself
-
(d) From the lead intensifying screens
Pregunta 14
Pregunta
14. An effect of scattered radiation is to:
Respuesta
-
(a) Decrease required exposure time
-
(b) Diminish contrast, detail and clarity of radiographic image
-
(c) Decrease film density
-
(d) All of the above
Pregunta 15
Pregunta
15. What is the most important factor in determining the archival quality of radiographic film?
Respuesta
-
(a) Film density
-
(b) Image quality
-
(c) Degree of removal of fixer residues during washing
-
(d) Degree of removal of developer residues during washing
Pregunta 16
Pregunta
16. Radiographic enlargement to distinguish small defects is possible:
Respuesta
-
(a) Only with a very small source or focal spot size radiation source
-
(b) Routinely
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(c) With most sources
-
(d) Never
Pregunta 17
Pregunta
17. A detrimental effect of fluorescent screens might be:
Respuesta
-
(a) High definition
-
(b) Screen mottle
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(c) Non-linear attenuation
-
(d) Displaced core effect
Pregunta 18
Pregunta
18. The penetrating power of an X ray machine is indicated by:
Respuesta
-
(a) Milliamperage
-
(b) Tube voltage
-
(c) Filament current
-
(d) Anode current
Pregunta 19
Pregunta
19. Reticulation may be the result of:
Respuesta
-
(a) Inadequate agitation of the film during development
-
(b) Inadequate water rinse during processing
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(c) Using exhausted stop bath solution
-
(d) Developing solutions not maintained at the same temperatures.
Pregunta 20
Pregunta
20. The main advantage of having small focal spot on an X ray tube is:
Respuesta
-
(a) Heat is conducted away more efficiently than with a large focal spot
-
(b) A smaller focal spot is unlikely to be damaged from the required tube currents
-
(c) Longer tube life
-
(d) A smaller focal spot allows sharper radiographic images than does a larger focal spot
Pregunta 21
Pregunta
21. Cobalt-60 is produced by:
Respuesta
-
(a) Fission of Uranium-235
-
(b) Neutron capture by Cobalt-59
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(c) Radioactive decay
-
(d) None of the above
Pregunta 22
Pregunta
22. For a particular isotope, gamma radiation intensity is determined by:
Respuesta
-
(a) Type of isotope used
-
(b) Energy level of gamma rays in source
-
(c) Source strength in curies
-
(d) None of the above
Pregunta 23
Pregunta
23. Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?
Respuesta
-
(a) The focal spot should be as small as practicable
-
(b) The focal spot to test piece distance should be as large as practicable
-
(c) The film to test piece distance should be as small as practicable
-
(d) All of the above
Pregunta 24
Pregunta
24. Which of the following correctly expresses the inverse square law if I1=dose rate nearest source, I2=dose rate furthest from the source, D1=distance nearest to source and D2=distance furthest from the source:
Respuesta
-
(a) I1/I2 = D1^2/D2^2
-
(b) I1^2/I2^2 = D1/D2
-
(c) I1/I2 = D2^2/D1^2
-
(d) I1^2/I2^2 = D2/D1
Pregunta 25
Pregunta
25. Thicker materials would normally be inspected using:
Respuesta
-
(a) Lower kV X rays
-
(b) Higher mA X rays
-
(c) Higher kV X rays
-
(d) Lower mA X rays
Pregunta 26
Pregunta
26. Another name for a penetrameter is:
Respuesta
-
(a) Radiographic shim
-
(b) Image quality indicator
-
(c) Density standard
-
(d) Acceptance standard
Pregunta 27
Pregunta
27. The silver nitrate spot test can be used to:
Respuesta
-
(a) Check the film for film quality
-
(b) Check for under developed films
-
(c) Check for film artifacts
-
(d) All the above answers are correct
Pregunta 28
Pregunta
28. The difference in densities seen on a radiograph due to section changes in an item is:
Respuesta
-
(a) Film contrast
-
(b) Radiographic contrast
-
(c) Subject contrast
-
(d) Radiographic sensitivity
Pregunta 29
Pregunta
29. Which type of film would exhibit the coarsest grain?
Respuesta
-
(a) Slow
-
(b) Medium
-
(c) Fast
-
(d) No difference in the grain sizes
Pregunta 30
Pregunta
30. An advantage of a gamma ray source is:
Respuesta
-
(a) Radiation may be turned on or off at will
-
(b) Outside power is normally not required
-
(c) Less shielding is required than for X ray
-
(d) All of the above
Pregunta 31
Pregunta
31. Higher X ray tube voltages result in:
Respuesta
-
(a) Shorter wavelengths X rays
-
(b) Less penetrating X rays
-
(c) Fewer X rays in the primary beam
-
(d) All of the above
Pregunta 32
Pregunta
32. A casting flaw which is formed when two masses of molten metal flowing from different directions flow together, but fail to fuse, is called:
Respuesta
-
(a) A hot tear
-
(b) Shrinkage
-
(c) A cold crack
-
(d) A cold shut
Pregunta 33
Pregunta
33. X rays are produced by:
Respuesta
-
(a) Radioactive isotopes
-
(b) The rapid deceleration of electrons
-
(c) Ultraviolet radiation of unstable atoms
-
(d) All of the above
Pregunta 34
Pregunta
34. Which of the following is a function of lead screens?
Respuesta
-
(a) To reduce geometric unsharpness
-
(b) To increase scatter
-
(c) To reduce exposure time
-
(d) All of the above
Pregunta 35
Pregunta
35. A silver nitrate spot test might be used to:
Respuesta
-
(a) Check for archival film quality
-
(b) Check for out of date film
-
(c) Check for single versus double emulsion film
-
(d) Any of the above
Pregunta 36
Pregunta
36. A linear accelerator is used to produce X rays having energy in the range of:
Respuesta
-
(a) Several MeV
-
(b) 50-500 keV
-
(c) 500-1000 keV
-
(d) 0-50 keV
Pregunta 37
Pregunta
37. How is the wavelength of scattered radiation compared to the primary beam?
Respuesta
-
(a) Longer than the wavelength of the primary beam
-
(b) Shorter than the wavelength of the primary beam
-
(c) Same as the wavelength of the primary beam
-
(d) Not related
Pregunta 38
Pregunta
38.Which of the following viewing conditions is most desirable for interpreting radiographic film?
Respuesta
-
(a) Brightness of surroundings approximately the same as the area of interest on the radiograph
-
(b) Totally dark viewing room
-
(c) Well lit viewing room
-
(d) None of the above
Pregunta 39
Pregunta
39. Pinhole radiography would be used to:
Respuesta
-
(a) Make high quality radiographs for critical inspection
-
(b) Determine focal spot size
-
(c) Construct exposure charts
-
(d) None of the above
Pregunta 40
Pregunta
40. A straight, dark line in the centre of the film of a weld cap would probably be:
Respuesta
-
(a) Porosity
-
(b) Undercut
-
(c) Tungsten inclusions
-
(d) A linear crack
Pregunta 41
Pregunta
41. Which one of the following steps is necessary to dissolve the undarkened silver salt crystals in the film emulsion:
Respuesta
-
(a) Developing
-
(b) Fixing
-
(c) Washing
-
(d) None of the above
Pregunta 42
Pregunta
42. Approximately what energy X ray machine would be required to have penetrating power equivalent to a Cobalt-60 source:
Respuesta
-
(a) 600 keV
-
(b) 1.2 MeV
-
(c) 2 MeV
-
(d) None of the above
Pregunta 43
Pregunta
43. The normal range of steel that is radiographed using Ir-192 is:
Respuesta
-
(a) 5 mm–20 mm
-
(b) 25mm–75mm
-
(c) 0.5mm–5mm
-
(d) 75mm–150mm
Pregunta 44
Pregunta
44. The focal spot size of an X ray machine must be known in order to determine:
Respuesta
-
(a) The geometric unsharpness
-
(b) Kilovoltage peak output
-
(c) Required mA setting
-
(d) Exposure time
Pregunta 45
Pregunta
45. X ray intensity is a function of :
Respuesta
-
(a) Cathode current
-
(b) Step down ratio of the filament transformer
-
(c) The distance from the test piece
-
(d) Size of the anode (target)
Pregunta 46
Pregunta
46. What is the minimum age in years at which a person may perform radiography :
Respuesta
-
(a) 15
-
(b) 18
-
(c) 21
-
(d) 30
Pregunta 47
Pregunta
47. A densitometer is an instrument that measures:
Respuesta
-
(a) Radiographic contrast
-
(b) Radiographic sensitivity
-
(c) Radiographic density
-
(d) Radiographic resolution
Pregunta 48
Pregunta
48. 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:
Respuesta
-
(a) Ug = FD/T
-
(b) Ug = DT/F
-
(c) Ug = FT/D
-
(d) Ug = FTD
Pregunta 49
Pregunta
49. A wetting agent is used in film processing to:
Respuesta
-
(a) More closely control development
-
(b) Prevent formation of water marks during the drying stage
-
(c) Reduce formation of air bubbles in the developer solution
-
(d) Reduce formation of air bubbles in the fixer
Pregunta 50
Pregunta
50. Film intensifying screens are normally used to:
Respuesta
-
(a) Decrease exposure time
-
(b) Increase grain size
-
(c) Shield film from stray light
-
(d) All of the above
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