Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. The gamma factor of Tm-170 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-1at one metre
Q. An exposed radiographic film which transmits 1% of the light incident on it has whatdensity:
a. 1.0
b. 2.0
c. 99.0
d. 0.5
Q. If the radiation intensity is 5 Gy/h (500 R/h) at a distance of 152.4 cm (5 feet) from asource, what is the intensity at 1524 cm (50 feet)?
a. 0.5 Gy/h (50 R/h)
b. 1.0 Gy/h (100 R/h)
c. 0.1 Gy/h (10R/h)
d. 0.05 Gy/h (5 R/h)
Q. The average energy of a Cs-137 source is approximately:
a. 60-80 keV
b. 660 keV
c. 400 keV
d. 1.2 MeV
Q. Which of the following is an advantage of X ray over gamma ray sources forradiography?
a. Portability
b. Required maintenance
c. Variable radiation energy
d. All of the above
Q. The basic purpose of a penetrameter is to:
a. Indicate quality of the radiographic technique
b. Indicate the smallest discontinuity which can be shown by the radiographic technique being used
c. Serve as a comparison standard for evaluating discontinuity size
d. All of the above
Q. When a casting is being non destructively examined for critical service, and thepossibility of cracks exists, which of the following techniques would be best?
a. X ray radiography at 200 kV or less
b. Magnetic Particle or Liquid Penetrant testing
c. Radiography (X or gamma ray, depending on the thickness)
d. Radiography and either Magnetic Particle or liquid Penetrant testing
Q. Which of the following is an advantage of X ray over gamma ray sources forradiography?
a. Safety
b. Variable radiation intensity
c. Variable radiation energy
d. All of the above
Q. The average energy of a T3-170 source is approximately:
a. 60-80 keV
b. 660 keV
c. 400 keV
d. 1.2 MeV
Q. The gamma factor of Co-60 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-1at one metre
Q. The intensifying effect of lead screens is mainly caused by:
a. X ray generated by the lead screens
b. Fluorescence of the lead screens
c. Excited electrons
d. The Maxwell effect
Q. Which of the following expressions correctly determines radiographic density?
a. Io/It
b. Log (Io/It)
c. Log (Io-It)
d. Io-It
Q. The most significant difference in two X ray beams produced at different kV settingsis:
a. Beam intensity
b. Exposure
c. Wavelength distribution
d. Beam divergence
Q. Most significant difference in two X ray beams produced at different mA settings is:
a. Penetrating power
b. Wavelength distribution
c. X ray quality
d. Beam intensity
Q. Which of the following would be considered a film artifact?
a. Excessive film density
b. Insufficient film density
c. Insufficient definition (penetrameter holes)
d. Static marks