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