NDT Final Exam Flashcards Study Guide & Comprehensive Non-Destructive
Testing Revision Notes
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 - ✔✔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 - ✔✔b) False
Thermography is known as a direct process form of NDT.
a) True
b) False - ✔✔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) - ✔✔c) flaw detection
The maximum temperature measurement error when a thermal camera is properly
setup/calibrated is known as its... - ✔✔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 - ✔✔a) Translucence
The array size of an infrared camera refers to... - ✔✔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. - ✔✔a) 0.1239"
The smallest temperature difference that can be reliably detected by each pixel in a thermal
camera is known as its... - ✔✔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... - ✔✔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. - ✔✔a) zero
When using X-rays an isotope delivery system is used to expose the test piece to radiation.
a) True
b) False - ✔✔b) False
Gamma ray inspection is very limited and can only be used on metal components, not on
plastics or other low density materials.
Testing Revision Notes
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 - ✔✔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 - ✔✔b) False
Thermography is known as a direct process form of NDT.
a) True
b) False - ✔✔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) - ✔✔c) flaw detection
The maximum temperature measurement error when a thermal camera is properly
setup/calibrated is known as its... - ✔✔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 - ✔✔a) Translucence
The array size of an infrared camera refers to... - ✔✔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. - ✔✔a) 0.1239"
The smallest temperature difference that can be reliably detected by each pixel in a thermal
camera is known as its... - ✔✔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... - ✔✔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. - ✔✔a) zero
When using X-rays an isotope delivery system is used to expose the test piece to radiation.
a) True
b) False - ✔✔b) False
Gamma ray inspection is very limited and can only be used on metal components, not on
plastics or other low density materials.
