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