NDT Final Exam with all Correct & 100% Verified Answers
|Actual Complete Update |Already Graded A+
Select the advantage of using thermography to perform NDT.
a) relatively large inspection area, fast
b) can easily detect very small flaws
c) requires access to both sides of a test object
d) is not affected by environmental conditions ✔Correct Answer-a) relatively large inspection
area, fast
When viewing a thermographic image directly any damage will always show up true size, not
distorted.
a) True
b) False ✔Correct Answer-b) False
Thermography is known as a direct process form of NDT.
a) True
b) False ✔Correct Answer-b) False
All of the following are basic steps in the thermography process except...
a) analysis
b) temperature measurement
c) flaw detection
d) excitation (stimulation) ✔Correct Answer-c) flaw detection
The maximum temperature measurement error when a thermal camera is properly
setup/calibrated is known as its... ✔Correct Answer-a) Accuracy
Thermography is affected by all of the following material thermal properties except...
a) Translucence
b) conductivity
c) diffusivity
d) none of these, all properties listed have an effect
e) capacitance
f) reflectivity ✔Correct Answer-a) Translucence
The array size of an infrared camera refers to... ✔Correct Answer-c) the resolution of the
detector
Calculate the vertical pixel size for a thermal camera with a resolution of 496 X 372, using a lens
that is 36° X 27°, at a working distance of 8 feet. ✔Correct Answer-a) 0.1239"
, The smallest temperature difference that can be reliably detected by each pixel in a thermal
camera is known as its... ✔Correct Answer-b) Thermal Sensitivity
The temperature measurement pixels in thermographic camera with a resolution of 640 X 480
with a lens that is 28° X 21° will be... ✔Correct Answer-a) Square
X-rays or Gamma radiation are used to perform radiography rather than Alpha or Beta radiation
because they have ________ charge or specific ionization. ✔Correct Answer-a) zero
When using X-rays an isotope delivery system is used to expose the test piece to radiation.
a) True
b) False ✔Correct Answer-b) False
Gamma ray inspection is very limited and can only be used on metal components, not on
plastics or other low density materials.
a) True
b) False ✔Correct Answer-b) False
The decay rate (length of half-life) of a gamma ray source ______ be altered by chemical or
physical processes.
a) can not
b) can ✔Correct Answer-a) can not
High quality radiographic images are those that have ________ contrast and ________
definition in the area of interest. ✔Correct Answer-c) high, sharp
When a given amount of X-ray or Gamma radiation travels through an object its total energy
__________ the further it travels, this is known as attenuation. ✔Correct Answer-b)
decreases exponentially
Select the true statement about an X-ray generating machine.
a) a high voltage electric charge is used to accelerate electrons from the source to the target
b) they are always emitting radiation and have to be stored in a special enclosure
c) an isotope is used as the source material for the X-ray
d) a chemical reaction is used to remove an electron from the source material ✔Correct
Answer-a) a high voltage electric charge is used to accelerate electrons from the source to the
target
Gamma radiation and X-rays are ________ frequency and have _______ wavelength compared
to visible light. ✔Correct Answer-a) Higher, Shorter
The half-life of a radioisotope is the time it takes for the amount of radiation given off by that
material to fall to a level where it can be handled without PPE.
a) True
|Actual Complete Update |Already Graded A+
Select the advantage of using thermography to perform NDT.
a) relatively large inspection area, fast
b) can easily detect very small flaws
c) requires access to both sides of a test object
d) is not affected by environmental conditions ✔Correct Answer-a) relatively large inspection
area, fast
When viewing a thermographic image directly any damage will always show up true size, not
distorted.
a) True
b) False ✔Correct Answer-b) False
Thermography is known as a direct process form of NDT.
a) True
b) False ✔Correct Answer-b) False
All of the following are basic steps in the thermography process except...
a) analysis
b) temperature measurement
c) flaw detection
d) excitation (stimulation) ✔Correct Answer-c) flaw detection
The maximum temperature measurement error when a thermal camera is properly
setup/calibrated is known as its... ✔Correct Answer-a) Accuracy
Thermography is affected by all of the following material thermal properties except...
a) Translucence
b) conductivity
c) diffusivity
d) none of these, all properties listed have an effect
e) capacitance
f) reflectivity ✔Correct Answer-a) Translucence
The array size of an infrared camera refers to... ✔Correct Answer-c) the resolution of the
detector
Calculate the vertical pixel size for a thermal camera with a resolution of 496 X 372, using a lens
that is 36° X 27°, at a working distance of 8 feet. ✔Correct Answer-a) 0.1239"
, The smallest temperature difference that can be reliably detected by each pixel in a thermal
camera is known as its... ✔Correct Answer-b) Thermal Sensitivity
The temperature measurement pixels in thermographic camera with a resolution of 640 X 480
with a lens that is 28° X 21° will be... ✔Correct Answer-a) Square
X-rays or Gamma radiation are used to perform radiography rather than Alpha or Beta radiation
because they have ________ charge or specific ionization. ✔Correct Answer-a) zero
When using X-rays an isotope delivery system is used to expose the test piece to radiation.
a) True
b) False ✔Correct Answer-b) False
Gamma ray inspection is very limited and can only be used on metal components, not on
plastics or other low density materials.
a) True
b) False ✔Correct Answer-b) False
The decay rate (length of half-life) of a gamma ray source ______ be altered by chemical or
physical processes.
a) can not
b) can ✔Correct Answer-a) can not
High quality radiographic images are those that have ________ contrast and ________
definition in the area of interest. ✔Correct Answer-c) high, sharp
When a given amount of X-ray or Gamma radiation travels through an object its total energy
__________ the further it travels, this is known as attenuation. ✔Correct Answer-b)
decreases exponentially
Select the true statement about an X-ray generating machine.
a) a high voltage electric charge is used to accelerate electrons from the source to the target
b) they are always emitting radiation and have to be stored in a special enclosure
c) an isotope is used as the source material for the X-ray
d) a chemical reaction is used to remove an electron from the source material ✔Correct
Answer-a) a high voltage electric charge is used to accelerate electrons from the source to the
target
Gamma radiation and X-rays are ________ frequency and have _______ wavelength compared
to visible light. ✔Correct Answer-a) Higher, Shorter
The half-life of a radioisotope is the time it takes for the amount of radiation given off by that
material to fall to a level where it can be handled without PPE.
a) True
