Top 150+ Solved Radiographic Testing Level 2 MCQ Questions Answer
Q. 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
Q. A photon-electron interaction in which a photon gives up a portion of its energy to anelectron is called:
a. The photoelectric effect
b. The Compton effect
c. Pair production
d. Bremsstrahlung
Q. If the radiation intensity is 5.9 Gy/h (590 R/h) at a distance of 30.5 cm (1 foot) from asource, 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)
Q. 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
Q. If the radiation intensity is 5 Gy/h (500 R/h) at a distance of 152.4 cm (5 feet) from asource, 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)
Q. Which of the following techniques would probably reduce the amount of scatteredradiation 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
Q. The lights in a high intensity viewer are typically:
a. Fluorescent
b. Normal incandescent bulbs
c. Photoflood bulbs
d. Mercury vapour lamps
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