Test
Proyecto RT.1 (1-50)
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Preguntas del test (50)
11. Which of the following types of intensifying screens are not used in industrial radiography?
- A(a) Lead
- B(b) Fluorescent
- C(c) Silver halide
- D(d) All of the above
22. Betatrons are used to produce X rays in what range?
- A(a) Several MeV
- B(b) 50-500 keV
- C(c) 500-1000 keV
- D(d) 0-50 keV
33. Which of the following is an isotope not artificially produced for industrial use:
- A(a) Ir-192
- B(b) Ra-226
- C(c) Co-60
- D(d) All of the above
44. One half value layer of lead for Iridium-192 is approximately:
- A12 mm
- B4 mm
- C2 mm
- D25 mm
55. One half value layer of lead for Cobalt-60 is approximately:
- A12 mm
- B6 mm
- C2 mm
- D25 mm
66. The film processing step in which the undeveloped silver bromide is removed from the film emulsion is called:
- ADevelopment
- BStop bath
- CFixing
- DRinsing
77. A radiation producing device which emits radiation of one or a few discreet wavelengths is:
- AAn X ray machine
- BA linear accelerator
- CA gamma ray source
- DA betatron
88. The intensifying action of lead screens is caused by:
- ASecondary X ray emission
- BSecondary gamma ray emissions
- C Fluorescence of lead screens
- D Electron emission
99. Most of the energy applied to an X ray tube is converted into:
- AX rays
- BLight
- CHeat
- DUltraviolet radiation
1010. Radiography of tubular sections using a double wall, double viewing technique is mainly applicable to sections:
- AOver 38 mm in diameter
- B88 mm in diameter or less
- C125 mm in diameter and less
- DUnder 25 mm in diameter
1111. Which of the following is the most common method of packaging film?
- A(a) Individual sheets for use in cassettes
- B(b) Rolls
- C(c) Pre-packaged (‘day-pack’)
- D(d) All of the above
1212. Which of the following types of radiation is particulate?
- A(a) X
- B(b) Gamma
- C(c) Alpha
- D(d) None of the above
1313. Most scattered radiation which adversely affects the radiographic image quality originates:
- A(a) From floors and walls adjacent to the test piece
- B(b) From other nearby objects
- C(c) From the test piece itself
- D(d) From the lead intensifying screens
1414. An effect of scattered radiation is to:
- A(a) Decrease required exposure time
- B(b) Diminish contrast, detail and clarity of radiographic image
- C(c) Decrease film density
- D(d) All of the above
1515. What is the most important factor in determining the archival quality of radiographic film?
- A(a) Film density
- B(b) Image quality
- C(c) Degree of removal of fixer residues during washing
- D(d) Degree of removal of developer residues during washing
1616. Radiographic enlargement to distinguish small defects is possible:
- A(a) Only with a very small source or focal spot size radiation source
- B(b) Routinely
- C(c) With most sources
- D(d) Never
1717. A detrimental effect of fluorescent screens might be:
- A(a) High definition
- B(b) Screen mottle
- C(c) Non-linear attenuation
- D(d) Displaced core effect
1818. The penetrating power of an X ray machine is indicated by:
- A(a) Milliamperage
- B(b) Tube voltage
- C(c) Filament current
- D(d) Anode current
1919. Reticulation may be the result of:
- A(a) Inadequate agitation of the film during development
- B(b) Inadequate water rinse during processing
- C(c) Using exhausted stop bath solution
- D(d) Developing solutions not maintained at the same temperatures.
2020. The main advantage of having small focal spot on an X ray tube is:
- A(a) Heat is conducted away more efficiently than with a large focal spot
- B(b) A smaller focal spot is unlikely to be damaged from the required tube currents
- C(c) Longer tube life
- D(d) A smaller focal spot allows sharper radiographic images than does a larger focal spot
2121. Cobalt-60 is produced by:
- A(a) Fission of Uranium-235
- B(b) Neutron capture by Cobalt-59
- C(c) Radioactive decay
- D(d) None of the above
2222. For a particular isotope, gamma radiation intensity is determined by:
- A(a) Type of isotope used
- B(b) Energy level of gamma rays in source
- C(c) Source strength in curies
- D(d) None of the above
2323. Which of the following statements should be true to achieve the highest level of radiographic sharpness (definition)?
- A(a) The focal spot should be as small as practicable
- B(b) The focal spot to test piece distance should be as large as practicable
- C(c) The film to test piece distance should be as small as practicable
- D(d) All of the above
2424. 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:
- A(a) I1/I2 = D1^2/D2^2
- B(b) I1^2/I2^2 = D1/D2
- C(c) I1/I2 = D2^2/D1^2
- D(d) I1^2/I2^2 = D2/D1
2525. Thicker materials would normally be inspected using:
- A(a) Lower kV X rays
- B(b) Higher mA X rays
- C(c) Higher kV X rays
- D(d) Lower mA X rays
2626. Another name for a penetrameter is:
- A(a) Radiographic shim
- B(b) Image quality indicator
- C(c) Density standard
- D(d) Acceptance standard
2727. The silver nitrate spot test can be used to:
- A(a) Check the film for film quality
- B(b) Check for under developed films
- C(c) Check for film artifacts
- D(d) All the above answers are correct
2828. The difference in densities seen on a radiograph due to section changes in an item is:
- A(a) Film contrast
- B(b) Radiographic contrast
- C(c) Subject contrast
- D(d) Radiographic sensitivity
2929. Which type of film would exhibit the coarsest grain?
- A(a) Slow
- B(b) Medium
- C(c) Fast
- D(d) No difference in the grain sizes
3030. An advantage of a gamma ray source is:
- A(a) Radiation may be turned on or off at will
- B(b) Outside power is normally not required
- C(c) Less shielding is required than for X ray
- D(d) All of the above
3131. Higher X ray tube voltages result in:
- A(a) Shorter wavelengths X rays
- B(b) Less penetrating X rays
- C(c) Fewer X rays in the primary beam
- D(d) All of the above
3232. 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) A hot tear
- B(b) Shrinkage
- C(c) A cold crack
- D(d) A cold shut
3333. X rays are produced by:
- A(a) Radioactive isotopes
- B(b) The rapid deceleration of electrons
- C(c) Ultraviolet radiation of unstable atoms
- D(d) All of the above
3434. Which of the following is a function of lead screens?
- A(a) To reduce geometric unsharpness
- B(b) To increase scatter
- C(c) To reduce exposure time
- D(d) All of the above
3535. A silver nitrate spot test might be used to:
- A(a) Check for archival film quality
- B(b) Check for out of date film
- C(c) Check for single versus double emulsion film
- D(d) Any of the above
3636. A linear accelerator is used to produce X rays having energy in the range of:
- A(a) Several MeV
- B(b) 50-500 keV
- C(c) 500-1000 keV
- D(d) 0-50 keV
3737. How is the wavelength of scattered radiation compared to the primary beam?
- A(a) Longer than the wavelength of the primary beam
- B(b) Shorter than the wavelength of the primary beam
- C(c) Same as the wavelength of the primary beam
- D(d) Not related
3838.Which of the following viewing conditions is most desirable for interpreting radiographic film?
- A(a) Brightness of surroundings approximately the same as the area of interest on the radiograph
- B(b) Totally dark viewing room
- C(c) Well lit viewing room
- D(d) None of the above
3939. Pinhole radiography would be used to:
- A(a) Make high quality radiographs for critical inspection
- B(b) Determine focal spot size
- C(c) Construct exposure charts
- D(d) None of the above
4040. A straight, dark line in the centre of the film of a weld cap would probably be:
- A(a) Porosity
- B(b) Undercut
- C(c) Tungsten inclusions
- D(d) A linear crack
4141. Which one of the following steps is necessary to dissolve the undarkened silver salt crystals in the film emulsion:
- A(a) Developing
- B(b) Fixing
- C(c) Washing
- D(d) None of the above
4242. Approximately what energy X ray machine would be required to have penetrating power equivalent to a Cobalt-60 source:
- A(a) 600 keV
- B(b) 1.2 MeV
- C(c) 2 MeV
- D(d) None of the above
4343. The normal range of steel that is radiographed using Ir-192 is:
- A(a) 5 mm–20 mm
- B(b) 25mm–75mm
- C(c) 0.5mm–5mm
- D(d) 75mm–150mm
4444. The focal spot size of an X ray machine must be known in order to determine:
- A(a) The geometric unsharpness
- B(b) Kilovoltage peak output
- C(c) Required mA setting
- D(d) Exposure time
4545. X ray intensity is a function of :
- A(a) Cathode current
- B(b) Step down ratio of the filament transformer
- C(c) The distance from the test piece
- D(d) Size of the anode (target)
4646. What is the minimum age in years at which a person may perform radiography :
- A(a) 15
- B(b) 18
- C(c) 21
- D(d) 30
4747. A densitometer is an instrument that measures:
- A(a) Radiographic contrast
- B(b) Radiographic sensitivity
- C(c) Radiographic density
- D(d) Radiographic resolution
- A(a) Radiographic contrast
4848. 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(a) Ug = FD/T
- B(b) Ug = DT/F
- C(c) Ug = FT/D
- D(d) Ug = FTD
4949. A wetting agent is used in film processing to:
- A(a) More closely control development
- B(b) Prevent formation of water marks during the drying stage
- C(c) Reduce formation of air bubbles in the developer solution
- D(d) Reduce formation of air bubbles in the fixer
5050. Film intensifying screens are normally used to:
- A(a) Decrease exposure time
- B(b) Increase grain size
- C(c) Shield film from stray light
- D(d) All of the above
Información
- Descripción
- Proyecto RT.1 (1-50)
- Autor
- ETSI Daniel Gomez
- Idioma
- Español
- Visitas
- 133
- Valoración
- Aún sin valoraciones Valora este test