Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Unacceptable radiographic film quality would be indicated by:
a. Artifacts of known origin in the film's area of interest
b. Use of a smaller penetrameter than required
c. H & D density less than 2.0
d. All of the above
Q. Which of the following welding discontinuities would be most difficult to imageradiographically:
a. Porosity
b. Lack of side wall fusion
c. Undercut
d. Slag inclusions
Q. The most important factor in limiting radiation exposure is:
a. Time
b. Distance
c. Shielding
d. All of the above
Q. The threshold energy below which pair production cannot occur is approximately:
a. 100 keV
b. 1 MeV
c. 10 MeV
d. 20 MeV
Q. A photon-electron interaction in which a photon gives up all its energy to an electronis called:
a. The photoelectric effect
b. The Compton effect
c. Pair production
d. Bremsstrahlung
Q. An acceptable quality radiograph should include:
a. Proper identification
b. Correct penetrameter and visible holes
c. Location markers
d. All of the above
Q. For gamma ray sources, radiographic intensity is proportional to source activity ingigabecquerels or curies for:
a. All sources
b. Large sources
c. Small sources
d. None of the above
Q. Poor contact between lead screens and film is likely to cause:
a. An indistinct or ‘fuzzy’ image
b. A mottled appearance on the film
c. ‘Undercut’ of the test piece image
d. Increased geometric unsharpness
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