Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Which of the following would be detrimental to radiographic image sharpness?
a. Small focal spot
b. Small film focal distance
c. Small object to film distance
d. None of the above
Q. A change in which the following parameters would require a new X ray exposurechart?
a. kV
b. X ray machine
c. Test piece thickness
d. All of the above
Q. If the required exposure time for a 1850 GBq (50 curie) Ir-192 source is 4 minutes,what exposure time would be required for 925 GBq (25 curie) source:
a. 4 minutes
b. 8 minutes
c. 2 minutes
d. 16 minutes
Q. A radiograph is made using film X with an exposure of 10 mA-min. Film density obtained in the area of interest is 1.0. If it is desired to achieve a density of 2.0 in the area of interest, what exposure is required? (Log relative exposure = 1.1 for a density of 1.0 and 1.62 for a density of 2.0)
a. 41.67 mA-min
b. 10 mA-min
c. 12.6 mA-min
d. 33.1 mA-min
Q. The least offensive of the following welding discontinuities would probably be:
a. Incomplete penetration
b. Lack of fusion
c. Slag inclusions
d. Porosity
Q. A quantity calculated by the formula, 0.693/(decay constant), is called:
a. Half value layer
b. Mass attenuation constant
c. Half-life
d. Specific activity
Q. The density difference displayed from one area of a film radiograph to another is called:
a. Subject contrast
b. Radiographic contrast
c. Film contrast
d. Film latitude
Q. Increasing the mA setting on an X ray machine:
a. Decreases exposure time
b. Increases exposure time
c. Increases the short wavelength components of the X ray beam
d. Decreases the short wavelength components of the X ray beam
Q. Which of the following would be considered a film artifact?
a. Excessive film density
b. Light leaks
c. Inadequate penetration
d. Sugar
Q. Which of the following would be detrimental to radiographic image sharpness?
a. Small focal spot
b. Large film focal distance
c. Small object to film distance
d. None of the above
Q. A dark crescent shaped mark in the centre of a weld bead radiographic image wouldprobably be:
a. A film artifact
b. Porosity
c. A tungsten inclusion
d. Root concavity
Q. A photon-nuclear interaction in which energy is converted into sub-atomic particles iscalled:
a. The photoelectric effect
b. The Compton effect
c. Pair production
d. Bremsstrahlung
Q. An interaction in which radiation is produced by the rapid deceleration of an electronis called:
a. The photoelectric effect
b. The Compton effect
c. Pair production
d. Bremsstrahlung