Top 1000+ Solved Non Destructive Testing and Evaluation MCQ Questions Answer
Q. Which of the following techniques would probably reduce the amount of backscattered radiation reaching the film during a radiographic exposure?
a. Using a finer grained film
b. Backing the cassette with a sheet of lead
c. Removing lead screens
d. All of the above
Q. Radiographic contrast is dependant on:
a. Density
b. Processing
c. Radiation energy
d. All of the above
Q. A plot of film density versus log of relative exposure is called:
a. An H&D curve
b. A sensitometric curve
c. A characteristic curve
d. All of the above
Q. The most common material used for targets in X ray tubes is:
a. Tungsten
b. Copper
c. Silver
d. Beryllium
Q. A dark crescent shaped spot, clearly in the base metal adjacent to a weld wouldprobably be:
a. Burn through
b. Film crimp mark
c. A crack
d. A water spot on the film
Q. Which of the following are potential sources of scattered radiation?
a. Test piece
b. Cassette
c. Floor
d. All of the above
Q. If the required exposure time for a 2220 GBq (60 curie) Ir-192 source is 2 minutes,what exposure time would be required at 1110 GBq (30 curie) source:
a. 2/3 minutes
b. 60 minutes
c. 2 minutes
d. 4 minutes
Q. An advantage of a larger grain film is:
a. It has higher speed
b. It has better definition
c. It has lower speed
d. None of the above
Q. How does radiation intensity change with increasing distance from the source?
a. Inversely with distance
b. Inversely with the square of distance
c. Directly with distance
d. Directly with the square of distance
Q. A weld discontinuity which consists of unmelted joint surfaces at the root, and whichmay be caused by poor fit- up, is called:
a. Hot short cracking
b. A slag inclusion
c. Incomplete penetration
d. Burn through
Q. Mottling due to X ray diffraction can be identified by:
a. Noting a large change between two successive exposures with the test piece rotated slightly about the beam axis
b. Noting a slight change between two successive exposures with the test piece rotated slightly about the beam axis
c. Noting a characteristic pattern corresponding to the lattice spacing
d. None of the above
Q. Which of the following welding discontinuities would be considered the most serious?
a. Porosity
b. Incomplete penetration
c. Crack
d. Slag inclusions
Q. A depression at the edge of a weld where the base metal has been melted duringwelding is called:
a. Burn through
b. Undercut
c. Root concavity
d. Root convexity
Q. Which of the following would not be considered a film artifact?
a. Sugar
b. Chemical streaks
c. PI lines
d. Pressure marks
Q. Gamma ray or high voltage X ray radiography, using film without lead screens, islikely to result in:
a. Mottling of the film
b. Increased geometric unsharpness
c. No apparent difference, but increased exposure time
d. No apparent difference, but decreased exposure time