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Here you can take a free ASNT NDT IR Level 2 Exam Practice Test with the latest Infrared and Thermal Testing Method Level III Questions and Answers.


The peak spectral radiance from a blackbody with a temperature of 1800 K (1526.85 °C) is:



Actual surfaces frequently exhibit variable emissivities over the wavelength spectrum. These surfaces are commonly referred to as:



Radiometric imagers of what wavelength should be used for accurate surface temperature measurement of plate glass?



The energy emitted from a piece of metal is measured and the temperature is determined to be 900 °C (1652 °F) assuming a surface emissivity of 0.79. It is later found that the true emissivity is 0.84. What is the closest temperature of the metal from the values listed below?



Which of the following nonuniformity corrections (NUC) will best provide both uniform detector response and correct for the offset between the target signal and the detector response over the temperature range of an active pulse IR inspection?



Liquid-in-glass thermometers are designed and calibrated for three conditions of use. Which of the following is not a condition of use for a liquid-in-glass thermometer?



Which device would be most appropriate for measuring the surface temperature of polyethylene film?



When observing an object at 51.85 °C (325 K), which of the following detectors has the greatest detectivity (D*)?



You are asked to inspect a new paper laminating process, with a long oven and stainless steel rollers, 91.44 cm (36 in.) wide. The paper is laminated with a foil, and only the foil side is visible as it curves around the stainless steel roller at the oven exit. It is important to ensure the foil temperature is uniform at the oven exit for the adhesive to cure properly. What is the best way to ensure the material is cured?



Energy is measured in units called:



What is the correct value of the Stefan-Boltzmann constant?



Wien’s displacement law for determining the peak wavelength of emitted radiation may be expressed as:



A change in the electrical resistance of the responsive element in an infrared detector due to temperature changes produced by absorbed, incident infrared radiation describes the:



The slit response method is the generally accepted method for determining IFOV measurement. What percent modulation is required to obtain an accurate temperature?



Thermographic stress analysis is based on which of the following effects relates dynamic changes in stress to the temperature changes they produce:



Vibrothermography is a non-destructive test method that involves monitoring the surface of a material with an infrared imager while the material is subjected to:



Thermal radiation is strongly absorbed by water vapor in which of the following wave bands?



The responsive element of infrared detectors can be divided into what two groups?



A good material for making a lens for an infrared imager is



Heat is applied to the surface of a 0.635 cm (0.25 in.) graphite epoxy laminate. Which of the following statements is true?



You are asked to determine the minimum defect size (surface indication) that can be resolved using a thermal imaging system with an IFOV of 1.5 milliradians. You are following ASTM 2582-07 which requires that nine contiguous pixels are projected within the boundaries of the indication. The minimum focus distance of the thermal imager is 60.96 cm (24 in.). Assuming the surface of the component has an emissivity of 0.94, what is the minimum defect size that can be resolved using the above system?



How do you know that an active pulse thermographic inspection of material had sufficient power and inspection time?



You are inspecting a 1 in. (2.54 cm) thick aluminum panel that has been heated to 50 °C (122 °F). A small surface hole in the panel appears warmer than the smooth surface surrounding it. Why?



What is the best surface preparation for using quartz lamps to conduct an active thermographic inspection of a composite component?



For the purpose of thermally locating subsurface discontinuities, what is the best method of applying heat to the surface of an 8-ply carbon fiber face sheet to detect delamination between ply 1 and 2?



Thermal diffusivity is proportional to:



You suspect that a potential defect indication in a sample may be due to a reflection from the flash lamp. What should you do to determine if the anomaly was a defect or a reflection?



When using a solvent to clean a test piece for thermal evaluation it is important to:



According to ASTM E2582-07, as the depth of a flaw increases, the size of the minimum detectable flaw must:



According to ASTM E2582-07, the optics and the focal plane should be sufficient so that the projection of nine contiguous pixels onto the sample plane is:



According to ASTM E2582-07, the peak contrast time of a subsurface defect depends on which of the following:



For high-speed imaging (in excess of 60 frames per second), which of the following detector materials is most appropriate:



A pyroelectric vidicon is a sensor.



The minimum resolvable temperature difference is a subjective measurement that depends on the:



The spatial resolution of an instrument is related to the:



How does temperature affect the wavelength of infrared peak emittance of an object?



Of the following contact temperature sensors, which is considered to be the most accurate sensor?



Which optical property changes due to temperature changes in liquid crystals?



When heat is applied to an inspection surface for active nondestructive evaluation of a material, a thermogram will develop that is a function of the material, the nature of the discontinuity, the heat intensity and:



With respect to thermal nondestructive testing, an empirical rule of thumb says that the radius of the smallest detectable discontinuity should be at least as its depth under the surface.



What is the term used to describe a thermal NDT technique where mechanical vibrations are externally induced into a structure producing heat caused by friction at discontinuities such as cracks and delaminations?



The energy emitted by an object radiates from a surface layer that is how thick.



What are the two atmospheric gases that absorb transmitted radiation over the wave band of 1 to 15 μm?



The minimum resolvable temperature difference is a subjective measurement that depends on the infrared imaging system’s:



You are asked to choose a thermal imaging camera for a critical inspection of an aerospace component. If an anomaly is present it is expected to have a very subtle signal with an MRTD of about 75 mK. The expected surface temperature is in the vicinity of 350 K. Which of the following detectors will provide the greatest thermal contrast?



When the radiant emission from a small opening in an isothermal enclosure is examined, the spectral response is found to closely approximate that of a:



Which type of cryogenic cooling system for a photovoltaic type detector is perhaps the best choice for laboratory operation where reliability, quiet operation, and low temperature are required?



Which of the following thermal detectors has the highest detectivity (D*)?



A material that has a flat spectral emissivity curve from 3-12 μm is considered a:



An important and critical assumption when using two-color pyrometers is that a smooth curve exists between two variables. What are these two variables?



Compared to a thermocouple, an advantage of a resistance temperature detector (RTD) is:



One of the advantages of using thermocouples for temperature measurement over a resistance temperature detector (RTD) is:



One of the advantages of using a resistance temperature detector (RTD) over a thermocouple is RTDs:



The Seebeck effect is the basis for what temperature measurement device?



You are asked to choose a surface temperature measuring device that must meet the following criteria: wide temperature range, operate in a variety of environments, simple to install, rugged, and relatively inexpensive. Which of the following devices meets your requirements the best?



What material is used as the primary element in high-accuracy resistance thermometers?



Distinguishing real temperature changes from apparent temperature changes is one of the biggest challenges facing infrared thermographers. Apparent temperature changes can be caused by differences in all of the following except:



Which spectral range will you choose to measure the temperature of an object with a temperature range of 200 to 1000 °C (392 to 1832 °F), inside a heating chamber with a glass viewing port?



You are asked to measure the température of polyethelene at a temperature range 80 to 90 °C (176 to 194 °F). What waveband and with which filter will you choose to make these temperature measurements?



When capturing a series of thermal images that record a transient thermal event, such as occurs with pulse heating of a material to detect subsurface anomalies, most of the rapid changes in the thermal evolution curve occur in the time interval immediately following thermal excitation. It is beneficial to view the thermal images using what type of time scale?


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