Proyecto RT.1 (1-50)

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Proyecto RT.1 (1-50)
ETSI Daniel Gomez
Quiz by ETSI Daniel Gomez , updated more than 1 year ago
ETSI Daniel Gomez
Created by ETSI Daniel Gomez over 9 years ago
112
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Resource summary

Question 1

Question
1. Which of the following types of intensifying screens are not used in industrial radiography?
Answer
  • (a) Lead
  • (b) Fluorescent
  • (c) Silver halide
  • (d) All of the above

Question 2

Question
2. Betatrons are used to produce X rays in what range?
Answer
  • (a) Several MeV
  • (b) 50-500 keV
  • (c) 500-1000 keV
  • (d) 0-50 keV

Question 3

Question
3. Which of the following is an isotope not artificially produced for industrial use:
Answer
  • (a) Ir-192
  • (b) Ra-226
  • (c) Co-60
  • (d) All of the above

Question 4

Question
4. One half value layer of lead for Iridium-192 is approximately:
Answer
  • 12 mm
  • 4 mm
  • 2 mm
  • 25 mm

Question 5

Question
5. One half value layer of lead for Cobalt-60 is approximately:
Answer
  • 12 mm
  • 6 mm
  • 2 mm
  • 25 mm

Question 6

Question
6. The film processing step in which the undeveloped silver bromide is removed from the film emulsion is called:
Answer
  • Development
  • Stop bath
  • Fixing
  • Rinsing

Question 7

Question
7. A radiation producing device which emits radiation of one or a few discreet wavelengths is:
Answer
  • An X ray machine
  • A linear accelerator
  • A gamma ray source
  • A betatron

Question 8

Question
8. The intensifying action of lead screens is caused by:
Answer
  • Secondary X ray emission
  • Secondary gamma ray emissions
  • Fluorescence of lead screens
  • Electron emission

Question 9

Question
9. Most of the energy applied to an X ray tube is converted into:
Answer
  • X rays
  • Light
  • Heat
  • Ultraviolet radiation

Question 10

Question
10. Radiography of tubular sections using a double wall, double viewing technique is mainly applicable to sections:
Answer
  • Over 38 mm in diameter
  • 88 mm in diameter or less
  • 125 mm in diameter and less
  • Under 25 mm in diameter

Question 11

Question
11. Which of the following is the most common method of packaging film?
Answer
  • (a) Individual sheets for use in cassettes
  • (b) Rolls
  • (c) Pre-packaged (‘day-pack’)
  • (d) All of the above

Question 12

Question
12. Which of the following types of radiation is particulate?
Answer
  • (a) X
  • (b) Gamma
  • (c) Alpha
  • (d) None of the above

Question 13

Question
13. Most scattered radiation which adversely affects the radiographic image quality originates:
Answer
  • (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

Question 14

Question
14. An effect of scattered radiation is to:
Answer
  • (a) Decrease required exposure time
  • (b) Diminish contrast, detail and clarity of radiographic image
  • (c) Decrease film density
  • (d) All of the above

Question 15

Question
15. What is the most important factor in determining the archival quality of radiographic film?
Answer
  • (a) Film density
  • (b) Image quality
  • (c) Degree of removal of fixer residues during washing
  • (d) Degree of removal of developer residues during washing

Question 16

Question
16. Radiographic enlargement to distinguish small defects is possible:
Answer
  • (a) Only with a very small source or focal spot size radiation source
  • (b) Routinely
  • (c) With most sources
  • (d) Never

Question 17

Question
17. A detrimental effect of fluorescent screens might be:
Answer
  • (a) High definition
  • (b) Screen mottle
  • (c) Non-linear attenuation
  • (d) Displaced core effect

Question 18

Question
18. The penetrating power of an X ray machine is indicated by:
Answer
  • (a) Milliamperage
  • (b) Tube voltage
  • (c) Filament current
  • (d) Anode current

Question 19

Question
19. Reticulation may be the result of:
Answer
  • (a) Inadequate agitation of the film during development
  • (b) Inadequate water rinse during processing
  • (c) Using exhausted stop bath solution
  • (d) Developing solutions not maintained at the same temperatures.

Question 20

Question
20. The main advantage of having small focal spot on an X ray tube is:
Answer
  • (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

Question 21

Question
21. Cobalt-60 is produced by:
Answer
  • (a) Fission of Uranium-235
  • (b) Neutron capture by Cobalt-59
  • (c) Radioactive decay
  • (d) None of the above

Question 22

Question
22. For a particular isotope, gamma radiation intensity is determined by:
Answer
  • (a) Type of isotope used
  • (b) Energy level of gamma rays in source
  • (c) Source strength in curies
  • (d) None of the above

Question 23

Question
23. Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?
Answer
  • (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

Question 24

Question
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:
Answer
  • (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

Question 25

Question
25. Thicker materials would normally be inspected using:
Answer
  • (a) Lower kV X rays
  • (b) Higher mA X rays
  • (c) Higher kV X rays
  • (d) Lower mA X rays

Question 26

Question
26. Another name for a penetrameter is:
Answer
  • (a) Radiographic shim
  • (b) Image quality indicator
  • (c) Density standard
  • (d) Acceptance standard

Question 27

Question
27. The silver nitrate spot test can be used to:
Answer
  • (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

Question 28

Question
28. The difference in densities seen on a radiograph due to section changes in an item is:
Answer
  • (a) Film contrast
  • (b) Radiographic contrast
  • (c) Subject contrast
  • (d) Radiographic sensitivity

Question 29

Question
29. Which type of film would exhibit the coarsest grain?
Answer
  • (a) Slow
  • (b) Medium
  • (c) Fast
  • (d) No difference in the grain sizes

Question 30

Question
30. An advantage of a gamma ray source is:
Answer
  • (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

Question 31

Question
31. Higher X ray tube voltages result in:
Answer
  • (a) Shorter wavelengths X rays
  • (b) Less penetrating X rays
  • (c) Fewer X rays in the primary beam
  • (d) All of the above

Question 32

Question
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:
Answer
  • (a) A hot tear
  • (b) Shrinkage
  • (c) A cold crack
  • (d) A cold shut

Question 33

Question
33. X rays are produced by:
Answer
  • (a) Radioactive isotopes
  • (b) The rapid deceleration of electrons
  • (c) Ultraviolet radiation of unstable atoms
  • (d) All of the above

Question 34

Question
34. Which of the following is a function of lead screens?
Answer
  • (a) To reduce geometric unsharpness
  • (b) To increase scatter
  • (c) To reduce exposure time
  • (d) All of the above

Question 35

Question
35. A silver nitrate spot test might be used to:
Answer
  • (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

Question 36

Question
36. A linear accelerator is used to produce X rays having energy in the range of:
Answer
  • (a) Several MeV
  • (b) 50-500 keV
  • (c) 500-1000 keV
  • (d) 0-50 keV

Question 37

Question
37. How is the wavelength of scattered radiation compared to the primary beam?
Answer
  • (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

Question 38

Question
38.Which of the following viewing conditions is most desirable for interpreting radiographic film?
Answer
  • (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

Question 39

Question
39. Pinhole radiography would be used to:
Answer
  • (a) Make high quality radiographs for critical inspection
  • (b) Determine focal spot size
  • (c) Construct exposure charts
  • (d) None of the above

Question 40

Question
40. A straight, dark line in the centre of the film of a weld cap would probably be:
Answer
  • (a) Porosity
  • (b) Undercut
  • (c) Tungsten inclusions
  • (d) A linear crack

Question 41

Question
41. Which one of the following steps is necessary to dissolve the undarkened silver salt crystals in the film emulsion:
Answer
  • (a) Developing
  • (b) Fixing
  • (c) Washing
  • (d) None of the above

Question 42

Question
42. Approximately what energy X ray machine would be required to have penetrating power equivalent to a Cobalt-60 source:
Answer
  • (a) 600 keV
  • (b) 1.2 MeV
  • (c) 2 MeV
  • (d) None of the above

Question 43

Question
43. The normal range of steel that is radiographed using Ir-192 is:
Answer
  • (a) 5 mm–20 mm
  • (b) 25mm–75mm
  • (c) 0.5mm–5mm
  • (d) 75mm–150mm

Question 44

Question
44. The focal spot size of an X ray machine must be known in order to determine:
Answer
  • (a) The geometric unsharpness
  • (b) Kilovoltage peak output
  • (c) Required mA setting
  • (d) Exposure time

Question 45

Question
45. X ray intensity is a function of :
Answer
  • (a) Cathode current
  • (b) Step down ratio of the filament transformer
  • (c) The distance from the test piece
  • (d) Size of the anode (target)

Question 46

Question
46. What is the minimum age in years at which a person may perform radiography :
Answer
  • (a) 15
  • (b) 18
  • (c) 21
  • (d) 30

Question 47

Question
47. A densitometer is an instrument that measures:
Answer
  • (a) Radiographic contrast
  • (b) Radiographic sensitivity
  • (c) Radiographic density
  • (d) Radiographic resolution

Question 48

Question
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:
Answer
  • (a) Ug = FD/T
  • (b) Ug = DT/F
  • (c) Ug = FT/D
  • (d) Ug = FTD

Question 49

Question
49. A wetting agent is used in film processing to:
Answer
  • (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

Question 50

Question
50. Film intensifying screens are normally used to:
Answer
  • (a) Decrease exposure time
  • (b) Increase grain size
  • (c) Shield film from stray light
  • (d) All of the above
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