McqMate
These multiple-choice questions (MCQs) are designed to enhance your knowledge and understanding in the following areas: Mechanical Engineering .
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 | |
Done Studing? Take A Test.
Great job completing your study session! Now it's time to put your knowledge to the test. Challenge yourself, see how much you've learned, and identify areas for improvement. Don’t worry, this is all part of the journey to mastery. Ready for the next step? Take a quiz to solidify what you've just studied.