Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. 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
Q. 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
Q. 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
Q. A straight, dark line in the centre of a weld bead image on film would be suspected ofbeing:
a. Lack of fusion
b. A crack
c. Incomplete penetration
d. Root concavity
Q. ‘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
Q. 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
Q. Contrast and definition are the two major factors that determine the ofthe radiograph:
a. Density
b. Sensitivity
c. Graininess
d. Intensity
Q. 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
Q. 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
Q. 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
Q. Contrast is defined as the comparison between on different areas ofthe radiograph:
a. Density
b. Sensitivity
c. Sharpness
d. Latitude
Q. Definition is defined as the measure of the of the outline of theimage in the radiograph.
a. Density
b. Sensitivity
c. Sharpness
d. Latitude
Q. 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
Q. 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
Q. 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