McqMate
Chapters
| 1. |
Increasing the kV setting on an X ray machine increases the: |
| A. | Penetrating power |
| B. | Short wavelength components of the X ray beam |
| C. | Radiation intensity |
| D. | All of the above |
| Answer» A. Penetrating power | |
| 2. |
During the manufacturing of a casting, the purpose of a riser is: |
| A. | To introduce molten metal into the mould |
| B. | To provide additional molten metal to allow for shrinkage during solidification |
| C. | To allow excess heat to escape during solidification |
| D. | To provide a vent for excess steam to escape |
| Answer» B. To provide additional molten metal to allow for shrinkage during solidification | |
| 3. |
An effective method of recognising a film artifact is: |
| A. | Viewing a film in daylight |
| B. | Viewing film in reflected light from a viewer |
| C. | Comparing both film shot with a double film technique |
| D. | All of the above |
| Answer» B. Viewing film in reflected light from a viewer | |
| 4. |
The main reason for using a casting is that: |
| A. | Castings are stronger than other metal product forms |
| B. | Castings are normally of higher quality than other metal product forms |
| C. | Complex shapes of minimum weight are easily manufactured |
| D. | None of the above |
| Answer» D. None of the above | |
| 5. |
A change in which of the following parameters would require a new X ray exposure chart? |
| A. | kV |
| B. | Required film density |
| C. | Test piece thickness |
| D. | All of the above |
| Answer» B. Required film density | |
| 6. |
Static marks on radiographic film are caused by: |
| A. | An improperly grounded X ray tube |
| B. | Scratches on the lead screens |
| C. | Poor film handling technique |
| D. | Old film |
| Answer» C. Poor film handling technique | |
| 7. |
Of the following radiographic sources, which emits the most penetrating radiation? |
| A. | Co-60 |
| B. | Ra-226 |
| C. | Cs-137 |
| D. | Ir-192 |
| Answer» A. Co-60 | |
| 8. |
Which of the following techniques would probably reduce the amount of back scattered radiation reaching the film during a radiographic exposure? |
| A. | Using a finer grained film |
| B. | Backing the cassette with a sheet of lead |
| C. | Removing lead screens |
| D. | All of the above |
| Answer» B. Backing the cassette with a sheet of lead | |
| 9. |
Radiographic contrast is dependant on: |
| A. | Density |
| B. | Processing |
| C. | Radiation energy |
| D. | All of the above |
| Answer» D. All of the above | |
| 10. |
A plot of film density versus log of relative exposure is called: |
| A. | An H&D curve |
| B. | A sensitometric curve |
| C. | A characteristic curve |
| D. | All of the above |
| Answer» D. All of the above | |
| 11. |
The most common material used for targets in X ray tubes is: |
| A. | Tungsten |
| B. | Copper |
| C. | Silver |
| D. | Beryllium |
| Answer» A. Tungsten | |
| 12. |
A dark crescent shaped spot, clearly in the base metal adjacent to a weld would probably be: |
| A. | Burn through |
| B. | Film crimp mark |
| C. | A crack |
| D. | A water spot on the film |
| Answer» B. Film crimp mark | |
| 13. |
Which of the following are potential sources of scattered radiation? |
| A. | Test piece |
| B. | Cassette |
| C. | Floor |
| D. | All of the above |
| Answer» D. All of the above | |
| 14. |
If the required exposure time for a 2220 GBq (60 curie) Ir-192 source is 2 minutes, what exposure time would be required at 1110 GBq (30 curie) source: |
| A. | 2/3 minutes |
| B. | 60 minutes |
| C. | 2 minutes |
| D. | 4 minutes |
| Answer» D. 4 minutes | |
| 15. |
An advantage of a larger grain film is: |
| A. | It has higher speed |
| B. | It has better definition |
| C. | It has lower speed |
| D. | None of the above |
| Answer» A. It has higher speed | |
| 16. |
How does radiation intensity change with increasing distance from the source? |
| A. | Inversely with distance |
| B. | Inversely with the square of distance |
| C. | Directly with distance |
| D. | Directly with the square of distance |
| Answer» B. Inversely with the square of distance | |
| 17. |
A weld discontinuity which consists of unmelted joint surfaces at the root, and which may be caused by poor fit- up, is called: |
| A. | Hot short cracking |
| B. | A slag inclusion |
| C. | Incomplete penetration |
| D. | Burn through |
| Answer» C. Incomplete penetration | |
| 18. |
Mottling due to X ray diffraction can be identified by: |
| A. | Noting a large change between two successive exposures with the test piece rotated slightly about the beam axis |
| B. | Noting a slight change between two successive exposures with the test piece rotated slightly about the beam axis |
| C. | Noting a characteristic pattern corresponding to the lattice spacing |
| D. | None of the above |
| Answer» B. Noting a slight change between two successive exposures with the test piece rotated slightly about the beam axis | |
| 19. |
Which of the following welding discontinuities would be considered the most serious? |
| A. | Porosity |
| B. | Incomplete penetration |
| C. | Crack |
| D. | Slag inclusions |
| Answer» C. Crack | |
| 20. |
A depression at the edge of a weld where the base metal has been melted during welding is called: |
| A. | Burn through |
| B. | Undercut |
| C. | Root concavity |
| D. | Root convexity |
| Answer» B. Undercut | |
| 21. |
Which of the following would not be considered a film artifact? |
| A. | Sugar |
| B. | Chemical streaks |
| C. | PI lines |
| D. | Pressure marks |
| Answer» A. Sugar | |
| 22. |
Gamma ray or high voltage X ray radiography, using film without lead screens, is likely to result in: |
| A. | Mottling of the film |
| B. | Increased geometric unsharpness |
| C. | No apparent difference, but increased exposure time |
| D. | No apparent difference, but decreased exposure time |
| Answer» A. Mottling of the film | |
| 23. |
Which of the following would be detrimental to radiographic image sharpness? |
| A. | Small focal spot |
| B. | Small film focal distance |
| C. | Small object to film distance |
| D. | None of the above |
| Answer» B. Small film focal distance | |
| 24. |
A change in which the following parameters would require a new X ray exposure chart? |
| A. | kV |
| B. | X ray machine |
| C. | Test piece thickness |
| D. | All of the above |
| Answer» B. X ray machine | |
| 25. |
If the required exposure time for a 1850 GBq (50 curie) Ir-192 source is 4 minutes, what exposure time would be required for 925 GBq (25 curie) source: |
| A. | 4 minutes |
| B. | 8 minutes |
| C. | 2 minutes |
| D. | 16 minutes |
| Answer» B. 8 minutes | |
| 26. |
A radiograph is made using film X with an exposure of 10 mA-min. Film density obtained in the area of interest is 1.0. If it is desired to achieve a density of 2.0 in the area of interest, what exposure is required? (Log relative exposure = 1.1 for a density of 1.0 and 1.62 for a density of 2.0) |
| A. | 41.67 mA-min |
| B. | 10 mA-min |
| C. | 12.6 mA-min |
| D. | 33.1 mA-min |
| Answer» A. 41.67 mA-min | |
| 27. |
The least offensive of the following welding discontinuities would probably be: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Slag inclusions |
| D. | Porosity |
| Answer» D. Porosity | |
| 28. |
A quantity calculated by the formula, 0.693/(decay constant), is called: |
| A. | Half value layer |
| B. | Mass attenuation constant |
| C. | Half-life |
| D. | Specific activity |
| Answer» C. Half-life | |
| 29. |
The density difference displayed from one area of a film radiograph to another is called: |
| A. | Subject contrast |
| B. | Radiographic contrast |
| C. | Film contrast |
| D. | Film latitude |
| Answer» B. Radiographic contrast | |
| 30. |
The half-life of Co-60 is approximately: |
| A. | 74 days |
| B. | 129 days |
| C. | 5.3 years |
| D. | 30.1 years |
| Answer» C. 5.3 years | |
| 31. |
Increasing the mA setting on an X ray machine: |
| A. | Decreases exposure time |
| B. | Increases exposure time |
| C. | Increases the short wavelength components of the X ray beam |
| D. | Decreases the short wavelength components of the X ray beam |
| Answer» A. Decreases exposure time | |
| 32. |
Which of the following would be considered a film artifact? |
| A. | Excessive film density |
| B. | Light leaks |
| C. | Inadequate penetration |
| D. | Sugar |
| Answer» B. Light leaks | |
| 33. |
Which of the following would be detrimental to radiographic image sharpness? |
| A. | Small focal spot |
| B. | Large film focal distance |
| C. | Small object to film distance |
| D. | None of the above |
| Answer» B. Large film focal distance | |
| 34. |
The half-life of Ir-192 is approximately: |
| A. | 74 days |
| B. | 129 days |
| C. | 5.3 years |
| D. | 30.1 years |
| Answer» A. 74 days | |
| 35. |
A dark crescent shaped mark in the centre of a weld bead radiographic image would probably be: |
| A. | A film artifact |
| B. | Porosity |
| C. | A tungsten inclusion |
| D. | Root concavity |
| Answer» A. A film artifact | |
| 36. |
A photon-nuclear interaction in which energy is converted into sub-atomic particles is called: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» C. Pair production | |
| 37. |
An interaction in which radiation is produced by the rapid deceleration of an electron is called: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» D. Bremsstrahlung | |
| 38. |
The gamma factor of Tm-170 is: |
| A. | 1.37 R·h-1·Ci-1at one metre |
| B. | 0.59 R·h-1·Ci-1at one metre |
| C. | 0.0062 R·h-1·Ci-1at one metre |
| D. | 0.38 R·h-1·Ci-1at one metre |
| Answer» C. 0.0062 R·h-1·Ci-1at one metre | |
| 39. |
An exposed radiographic film which transmits 1% of the light incident on it has what density: |
| A. | 1.0 |
| B. | 2.0 |
| C. | 99.0 |
| D. | 0.5 |
| Answer» C. 99.0 | |
| 40. |
If the radiation intensity is 5 Gy/h (500 R/h) at a distance of 152.4 cm (5 feet) from a source, what is the intensity at 1524 cm (50 feet)? |
| A. | 0.5 Gy/h (50 R/h) |
| B. | 1.0 Gy/h (100 R/h) |
| C. | 0.1 Gy/h (10R/h) |
| D. | 0.05 Gy/h (5 R/h) |
| Answer» D. 0.05 Gy/h (5 R/h) | |
| 41. |
The average energy of a Cs-137 source is approximately: |
| A. | 60-80 keV |
| B. | 660 keV |
| C. | 400 keV |
| D. | 1.2 MeV |
| Answer» B. 660 keV | |
| 42. |
Which of the following is an advantage of X ray over gamma ray sources for radiography? |
| A. | Portability |
| B. | Required maintenance |
| C. | Variable radiation energy |
| D. | All of the above |
| Answer» C. Variable radiation energy | |
| 43. |
The basic purpose of a penetrameter is to: |
| A. | Indicate quality of the radiographic technique |
| B. | Indicate the smallest discontinuity which can be shown by the radiographic technique being used |
| C. | Serve as a comparison standard for evaluating discontinuity size |
| D. | All of the above |
| Answer» A. Indicate quality of the radiographic technique | |
| 44. |
When a casting is being non destructively examined for critical service, and the possibility of cracks exists, which of the following techniques would be best? |
| A. | X ray radiography at 200 kV or less |
| B. | Magnetic Particle or Liquid Penetrant testing |
| C. | Radiography (X or gamma ray, depending on the thickness) |
| D. | Radiography and either Magnetic Particle or liquid Penetrant testing |
| Answer» B. Magnetic Particle or Liquid Penetrant testing | |
| 45. |
Which of the following is an advantage of X ray over gamma ray sources for radiography? |
| A. | Safety |
| B. | Variable radiation intensity |
| C. | Variable radiation energy |
| D. | All of the above |
| Answer» D. All of the above | |
| 46. |
The average energy of a T3-170 source is approximately: |
| A. | 60-80 keV |
| B. | 660 keV |
| C. | 400 keV |
| D. | 1.2 MeV |
| Answer» A. 60-80 keV | |
| 47. |
The gamma factor of Co-60 is: |
| A. | 1.37 R·h-1·Ci-1at one metre |
| B. | 0.59 R·h-1·Ci-1at one metre |
| C. | 0.0062 R·h-1·Ci-1at one metre |
| D. | 0.38 R·h-1·Ci-1at one metre |
| Answer» A. 1.37 R·h-1·Ci-1at one metre | |
| 48. |
The intensifying effect of lead screens is mainly caused by: |
| A. | X ray generated by the lead screens |
| B. | Fluorescence of the lead screens |
| C. | Excited electrons |
| D. | The Maxwell effect |
| Answer» C. Excited electrons | |
| 49. |
Which of the following expressions correctly determines radiographic density? |
| A. | Io/It |
| B. | Log (Io/It) |
| C. | Log (Io-It) |
| D. | Io-It |
| Answer» B. Log (Io/It) | |
| 50. |
The most significant difference in two X ray beams produced at different kV settings is: |
| A. | Beam intensity |
| B. | Exposure |
| C. | Wavelength distribution |
| D. | Beam divergence |
| Answer» C. Wavelength distribution | |
| 51. |
Most significant difference in two X ray beams produced at different mA settings is: |
| A. | Penetrating power |
| B. | Wavelength distribution |
| C. | X ray quality |
| D. | Beam intensity |
| Answer» D. Beam intensity | |
| 52. |
Which of the following would be considered a film artifact? |
| A. | Excessive film density |
| B. | Insufficient film density |
| C. | Insufficient definition (penetrameter holes) |
| D. | Static marks |
| Answer» D. Static marks | |
| 53. |
Natural discontinuities comparable in size to the penetrameter holes shown on a radiograph may not be detected because: |
| A. | Natural discontinuities may contain less dense material than the penetrameter holes |
| B. | Natural discontinuities may be thicker than the penetrameter holes |
| C. | Natural discontinuities do not necessarily have as sharp edges as the penetrameter holes |
| D. | All of the above |
| Answer» C. Natural discontinuities do not necessarily have as sharp edges as the penetrameter holes | |
| 54. |
If the radiation intensity is 1 Gy/h (100 R/h) at a distance of 152.4 cm (5 feet) from a source, what is the intensity at 610 cm (20 feet)? |
| A. | 0.0625 Gy/h (6.25 R/h) |
| B. | 0.25 Gy/h (25 R/h) |
| C. | 16 Gy/h (1600 R/h) |
| D. | 4 Gy/h (400 R/h) |
| Answer» A. 0.0625 Gy/h (6.25 R/h) | |
| 55. |
Fluorescent screens are seldom used in industrial radiography because: |
| A. | Light leaks degrade the film image |
| B. | Film fogging can result if used in the vicinity of fluorescent lights |
| C. | Poor definition and screen mottle can result |
| D. | None of the above |
| Answer» C. Poor definition and screen mottle can result | |
| 56. |
Calculate geometric unsharpness for the following conditions: Source size = 2 mm × 2 mm; SFD = 700 mm; test piece thickness = 25 mm |
| A. | 0.6 mm |
| B. | 0.06 mm |
| C. | 6,0 mm |
| D. | 0.15 mm |
| Answer» D. 0.15 mm | |
| 57. |
The gamma factor of Ir-192 is: |
| A. | 1.37 R·h-1·Ci-1at one metre |
| B. | 0.59 R·h-1·Ci-1at one metre |
| C. | 0.0062 R·h-1·Ci-1at one metre |
| D. | 0.38 R·h-1·Ci-1at one metre |
| Answer» B. 0.59 R·h-1·Ci-1at one metre | |
| 58. |
A test piece with large differences in thickness would have: |
| A. | High film contrast |
| B. | High subject contrast |
| C. | Low subject contrast |
| D. | Low film contrast |
| Answer» B. High subject contrast | |
| 59. |
A quantity expressed by the formula, 0.693/(absorption co-efficient) is called: |
| A. | Half value layer |
| B. | Mass attenuation constant |
| C. | Half-life |
| D. | Specific activity |
| Answer» A. Half value layer | |
| 60. |
Which of the following techniques would probably reduce the amount of scattered radiation reaching the film during a radiographic exposure? |
| A. | Using a finer grained film |
| B. | Using a filtered X ray beam |
| C. | Removing lead screens |
| D. | All of the above |
| Answer» B. Using a filtered X ray beam | |
| 61. |
A radiographic indication in a weld, characterised by two parallel dark lines in the film image, would probably be caused by: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Slag inclusions |
| D. | Tungsten inclusions |
| Answer» B. Lack of fusion | |
| 62. |
To produce the sharpest image, which of the following should be true? |
| A. | The radiographic source should be small |
| B. | The radiographic source should be as close as possible to the test piece |
| C. | The planes of the test piece and the film should be at oblique angles to each other |
| D. | All of the above |
| Answer» A. The radiographic source should be small | |
| 63. |
‘Undercut’ or ‘burned out’ edges of the test piece film image are caused by: |
| A. | Geometric unsharpness |
| B. | Scattered radiation |
| C. | Inadequate source to film distance |
| D. | Old film |
| Answer» B. Scattered radiation | |
| 64. |
Which of the following is an advantage of gamma ray over X ray sources for radiography? |
| A. | Portability |
| B. | No external power supply needed |
| C. | Ruggedness |
| D. | All of the above |
| Answer» D. All of the above | |
| 65. |
The intensifying effects of fluorescent screens are caused by: |
| A. | Electron emission |
| B. | Light emission |
| C. | Secondary X rays |
| D. | All of the above |
| Answer» B. Light emission | |
| 66. |
If the required X ray exposure time for a 225 kV, 5 mA exposure is 3 minutes, approximately what exposure time would be required at 10 mA? |
| A. | 1/2 minute |
| B. | 1 minute |
| C. | 1.5 minutes |
| D. | 3 minutes |
| Answer» C. 1.5 minutes | |
| 67. |
The half-life of Cs-137 is approximately: |
| A. | 74 days |
| B. | 129 days |
| C. | 5.3 years |
| D. | 30.1 years |
| Answer» D. 30.1 years | |
| 68. |
Unacceptable radiographic film quality would be indicated by: |
| A. | Artifacts of known origin in the film's area of interest |
| B. | Use of a smaller penetrameter than required |
| C. | H & D density less than 2.0 |
| D. | All of the above |
| Answer» D. All of the above | |
| 69. |
Which of the following welding discontinuities would be most difficult to image radiographically: |
| A. | Porosity |
| B. | Lack of side wall fusion |
| C. | Undercut |
| D. | Slag inclusions |
| Answer» B. Lack of side wall fusion | |
| 70. |
The most important factor in limiting radiation exposure is: |
| A. | Time |
| B. | Distance |
| C. | Shielding |
| D. | All of the above |
| Answer» D. All of the above | |
| 71. |
The threshold energy below which pair production cannot occur is approximately: |
| A. | 100 keV |
| B. | 1 MeV |
| C. | 10 MeV |
| D. | 20 MeV |
| Answer» B. 1 MeV | |
| 72. |
A photon-electron interaction in which a photon gives up all its energy to an electron is called: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» A. The photoelectric effect | |
| 73. |
An acceptable quality radiograph should include: |
| A. | Proper identification |
| B. | Correct penetrameter and visible holes |
| C. | Location markers |
| D. | All of the above |
| Answer» D. All of the above | |
| 74. |
For gamma ray sources, radiographic intensity is proportional to source activity in gigabecquerels or curies for: |
| A. | All sources |
| B. | Large sources |
| C. | Small sources |
| D. | None of the above |
| Answer» A. All sources | |
| 75. |
Poor contact between lead screens and film is likely to cause: |
| A. | An indistinct or ‘fuzzy’ image |
| B. | A mottled appearance on the film |
| C. | ‘Undercut’ of the test piece image |
| D. | Increased geometric unsharpness |
| Answer» A. An indistinct or ‘fuzzy’ image | |
| 76. |
Which of the following conditions might cause mottling of a radiographic film? |
| A. | Test piece with thickness equal to an integral multiple of the primary beam wavelength |
| B. | Back scatter from aged fluorescent screens |
| C. | Test piece with thickness of the same order of magnitude as the grain size |
| D. | Test piece with thickness equal to an integral multiple of the average grain size |
| Answer» B. Back scatter from aged fluorescent screens | |
| 77. |
A photon-electron interaction in which a photon gives up a portion of its energy to an electron is called: |
| A. | The photoelectric effect |
| B. | The Compton effect |
| C. | Pair production |
| D. | Bremsstrahlung |
| Answer» B. The Compton effect | |
| 78. |
If the radiation intensity is 5.9 Gy/h (590 R/h) at a distance of 30.5 cm (1 foot) from a source, how far is it to the point where the radiation intensity is 0.02 Gy/h (2R/h)? |
| A. | 518 cm (17 feet) |
| B. | 16551 cm (543 feet) |
| C. | 8291 cm (272 feet) |
| D. | 17983 cm (590 feet) |
| Answer» A. 518 cm (17 feet) | |
| 79. |
It is important to initiate the welding arc within the weld groove because: |
| A. | Starting a weld bead outside the groove may overheat the base metal |
| B. | Too rapid heating and cooling of the base metal can cause hard spots which are potential failure initiation sites |
| C. | Starting a weld bead outside the groove results in excessively wide welds |
| D. | None of the above |
| Answer» D. None of the above | |
| 80. |
If the radiation intensity is 5 Gy/h (500 R/h) at a distance of 152.4 cm (5 feet) from a source, how far is it to the point where the radiation intensity is 0.05 Gy/h (5 R/h)? |
| A. | 1676.4 cm (55 feet) |
| B. | 1981 cm (65 feet) |
| C. | 1524 cm (50 feet) |
| D. | 762 cm (25 feet) |
| Answer» C. 1524 cm (50 feet) | |
| 81. |
Which of the following techniques would probably reduce the amount of scattered radiation reaching the film during a radiographic exposure? |
| A. | Using a finer grained film |
| B. | Masking the test piece |
| C. | Removing lead screens |
| D. | All of the above |
| Answer» B. Masking the test piece | |
| 82. |
The lights in a high intensity viewer are typically: |
| A. | Fluorescent |
| B. | Normal incandescent bulbs |
| C. | Photoflood bulbs |
| D. | Mercury vapour lamps |
| Answer» C. Photoflood bulbs | |
| 83. |
The gamma factor of Cs-137 is: |
| A. | 1.37 R·h-1·Ci-1at one metre |
| B. | 0.59 R·h-1·Ci-1at one metre |
| C. | 0.0062 R·h-1·Ci-1at one metre |
| D. | 0.38 R·h-1·Ci-1 at one metre |
| Answer» D. 0.38 R·h-1·Ci-1 at one metre | |
| 84. |
If the required X ray exposure time for a 150 kV, 5 mA exposure is 2 minutes, approximately what exposure time would be required at 10 mA? |
| A. | 1/2 minute |
| B. | 1 minute |
| C. | 2 minutes |
| D. | 4 minutes |
| Answer» B. 1 minute | |
| 85. |
A thin, jagged, dark line inside the weld image on a radiographic film is probably: |
| A. | Incomplete penetration |
| B. | Lack of fusion |
| C. | Burn through |
| D. | A crack |
| Answer» D. A crack | |
| 86. |
A straight, dark line in the centre of a weld bead image on film would be suspected of being: |
| A. | Lack of fusion |
| B. | A crack |
| C. | Incomplete penetration |
| D. | Root concavity |
| Answer» C. Incomplete penetration | |
| 87. |
‘Undercut’ or ‘burned out’ edges of the test piece in film image can usually be reduced by: |
| A. | Increasing source to film distance |
| B. | Decreasing the thickness of the lead screens |
| C. | Placing a thin sheet of lead behind the cassette |
| D. | Masking the test piece |
| Answer» D. Masking the test piece | |
| 88. |
Which of the following would be detrimental to radiographic image sharpness? |
| A. | Small focal spot |
| B. | Large film focal distance |
| C. | Large object to film distance |
| D. | None of the above |
| Answer» C. Large object to film distance | |
| 89. |
Contrast and definition are the two major factors that determine the of the radiograph: |
| A. | Density |
| B. | Sensitivity |
| C. | Graininess |
| D. | Intensity |
| Answer» B. Sensitivity | |
| 90. |
Scatter radiation: |
| A. | Is not controllable |
| B. | Is controllable to some extent, but cannot be completely eliminated |
| C. | Can be eliminated completely by changing the kV |
| D. | Can be eliminated completely by using lead intensifying screens |
| Answer» B. Is controllable to some extent, but cannot be completely eliminated | |
| 91. |
Which of the following factors will affect the definition of the radiographic image? |
| A. | Intensity of radiation |
| B. | Film density |
| C. | Tube current |
| D. | Focal spot size |
| Answer» D. Focal spot size | |
| 92. |
Slow films: |
| A. | Give better definition than fast films |
| B. | Are faster than fast films |
| C. | Require shorter exposure times than fast films |
| D. | Usually have less contrast than fast films |
| Answer» A. Give better definition than fast films | |
| 93. |
Contrast is defined as the comparison between on different areas of the radiograph: |
| A. | Density |
| B. | Sensitivity |
| C. | Sharpness |
| D. | Latitude |
| Answer» A. Density | |
| 94. |
Definition is defined as the measure of the of the outline of the image in the radiograph. |
| A. | Density |
| B. | Sensitivity |
| C. | Sharpness |
| D. | Latitude |
| Answer» C. Sharpness | |
| 95. |
As radiation (X ray or gamma ray) energy is lowered: |
| A. | Radiation of longer wavelength and better penetration is produced |
| B. | Radiation of shorter wavelength and better penetration is produced |
| C. | Radiation of shorter wavelength and less penetration is produced |
| D. | Radiation longer wavelength and less penetration is produced |
| Answer» D. Radiation longer wavelength and less penetration is produced | |
| 96. |
Dark crescent-shaped indications on a radiographic film are most likely caused by: |
| A. | Crimping film after exposure |
| B. | Crimping film before exposure |
| C. | Sudden extreme temperature change while processing |
| D. | Warm or exhausted fixer |
| Answer» A. Crimping film after exposure | |
| 97. |
Lead screen are primarily used to: |
| A. | Improve the quality of the radiography by increasing the effect of scatter radiation |
| B. | Intensify the primary beam |
| C. | Decrease film graininess |
| D. | Reduce density of film |
| Answer» B. Intensify the primary beam | |
| 98. |
Static marks are most often caused by: |
| A. | Film bent when inserted in a cassette or holder |
| B. | Foreign material or dirt imbedded in screens |
| C. | Scratches on lead foil screens |
| D. | Improper film handling techniques |
| Answer» D. Improper film handling techniques | |
| 99. |
When radiographic energy is decreased: |
| A. | The subject contrast decreases |
| B. | The film contrast decreases |
| C. | The subject contrast increases |
| D. | The film contrast decreases |
| Answer» C. The subject contrast increases | |
| 100. |
The major cause for poor definition is: |
| A. | A source-to-film distance which is too long |
| B. | Screens which are too thin |
| C. | Film graininess |
| D. | Too small a source size |
| Answer» C. Film graininess | |
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