Take A Free ASNT NDT IR Level 3 Exam Practice Test – Quiz Course

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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.

1.

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

 
 
 
 

2.

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

 
 
 
 

3.

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

 
 
 
 

4.

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?

 
 
 
 

5.

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?

 
 
 
 

6.

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?

 
 
 
 

7.

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

 
 
 
 

8.

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

 
 
 
 

9.

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?

 
 
 
 

10.

Energy is measured in units called:

 
 
 
 

11.

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

 
 
 
 

12.

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

 
 
 
 

13.

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:

 
 
 
 

14.

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

 
 
 
 

15.

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

 
 
 
 

16.

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:

 
 
 
 

17.

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

 
 
 
 

18.

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

 
 
 
 

19.

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

 
 
 
 

20.

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

 
 
 
 

21.

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?

 
 
 
 

22.

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

 
 
 
 

23.

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?

 
 
 
 

24.

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

 
 
 
 

25.

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?

 
 
 
 

26.

Thermal diffusivity is proportional to:

 
 
 
 

27.

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?

 
 
 
 

28.

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

 
 
 
 

29.

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

 
 
 
 

30.

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:

 
 
 
 

31.

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

 
 
 
 

32.

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

 
 
 
 

33.

A pyroelectric vidicon is a sensor.

 
 
 
 

34.

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

 
 
 
 

35.

The spatial resolution of an instrument is related to the:

 
 
 
 

36.

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

 
 
 
 

37.

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

 
 
 
 

38.

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

 
 
 
 

39.

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:

 
 
 
 

40.

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.

 
 
 
 

41.

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?

 
 
 
 

42.

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

 
 
 
 

43.

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

 
 
 
 

44.

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

 
 
 
 

45.

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?

 
 
 
 

46.

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:

 
 
 
 

47.

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?

 
 
 
 

48.

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

 
 
 
 

49.

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

 
 
 
 

50.

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

 
 
 
 

51.

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

 
 
 
 

52.

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

 
 
 
 

53.

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

 
 
 
 

54.

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

 
 
 
 

55.

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?

 
 
 
 

56.

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

 
 
 
 

57.

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:

 
 
 
 

58.

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?

 
 
 
 

59.

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?

 
 
 
 

60.

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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Free ASNT NDT IR Level 3 Exam Practice Test – Thermal/Infrared Testing Questions and Answers (2026)

Prepare for the ASNT NDT Infrared/Thermal Testing (IR) Level III examination with UpWeld’s free online practice test. Practice multiple-choice questions covering infrared thermography, heat transfer, thermal imaging equipment, radiation principles, temperature measurement, inspection techniques, and interpretation of thermal test results.

Our ASNT IR Level 3 Practice Test is designed for NDT professionals, infrared thermographers, inspection engineers, and certification candidates who want to strengthen their technical knowledge before taking the ASNT NDT Level III Method Examination.

Take the Free ASNT NDT IR Level III Exam Practice Test – Infrared and Thermal Testing Questions and Answers.

Are You Looking for a Free ASNT NDT IR Level 3 Exam Practice Test?

If you are preparing for the ASNT NDT Level III Infrared/Thermal Testing (IR) certification examination, you are in the right place.

UpWeld provides a free online IR Level III practice quiz featuring technical and application-based multiple-choice questions to help you evaluate your understanding of infrared testing.

The practice test helps you:

  • Understand essential infrared and thermal testing principles.

  • Practice Level III technical and numerical questions.

  • Improve your knowledge of thermal imaging equipment and inspection techniques.

  • Identify areas requiring additional study.

  • Develop your ability to interpret thermal testing results.

  • Build confidence before taking the certification examination.

After completing the quiz, review your results and available answers to identify topics that need improvement.

Take the Free ASNT IR Level 3 Practice Test on This Page.

You can repeat the practice test to reinforce important concepts and monitor your progress.

What Is ASNT NDT IR Level III Certification?

ASNT NDT Level III certification in Thermal/Infrared Testing is an advanced professional credential offered through the American Society for Nondestructive Testing’s certification program.

Infrared/Thermal Testing (IR) is a nondestructive testing method that uses temperature measurements and thermal radiation analysis to investigate the condition and performance of materials, equipment, and structures.

Depending on the application, thermography can help identify abnormal heating, thermal discontinuities, insulation problems, electrical faults, mechanical friction, and other conditions associated with variations in thermal properties.

An IR Level III professional may have responsibilities involving inspection procedure development, technique selection, technical supervision, evaluation of results, personnel training, and NDT program management.

ASNT IR Level 3 Exam Pattern and Latest Details (2026)

According to ASNT’s published NDT Level III examination information, the Thermal/Infrared Testing (IR) Method Examination contains 90 questions and allows 2 hours for completion.

Exam Information Details
Certification ASNT NDT Level III
NDT Method Thermal/Infrared Testing (IR)
Exam Format Computer-Based Multiple-Choice Examination
IR Method Exam Questions 90
IR Method Exam Duration 2 Hours
NDT Level III Basic Exam Questions 135
NDT Basic Exam Duration 4 Hours
Initial Certification Basic Exam + At Least One Method Exam
Examination Language English

Important: First-time ASNT NDT Level III applicants must satisfy the certification program’s education and experience requirements and pass both the Basic Examination and at least one Method Examination.

For the latest examination information, visit the official ASNT NDT Level III Exam Information page.

ASNT NDT IR Level III Exam Syllabus and Important Topics

The ASNT Thermal/Infrared Testing Level III examination covers advanced theoretical, technical, and practical knowledge.

Candidates should review the following major subject areas identified in the ASNT examination outline.

1. Infrared Testing Principles and Theory

This section focuses on the scientific principles governing temperature, heat transfer, and infrared radiation.

Important topics include:

  • Fundamentals of infrared thermography

  • Temperature and thermal energy

  • Heat transfer through conduction, convection, and radiation

  • Thermal conductivity and thermal diffusivity

  • Specific heat capacity and thermal resistance

  • Emissivity, reflectivity, absorptivity, and transmissivity

  • Blackbody and graybody radiation

  • Stefan–Boltzmann law

  • Wien’s displacement law

  • Planck’s radiation law

  • Thermal equilibrium and heat flow

Candidates should understand how these physical principles affect temperature measurement and infrared inspection accuracy.

2. Materials Characteristics and Thermal Properties

Understanding material behavior is essential when evaluating thermal inspection results.

Study topics include:

  • Material thermal conductivity

  • Thermal diffusivity and heat capacity

  • Surface emissivity variations

  • Surface roughness and coatings

  • Metals, composites, ceramics, polymers, and insulation materials

  • Thermal behavior of discontinuities

  • Temperature gradients

  • Environmental effects on measurements

Level III candidates must understand how material properties influence thermal patterns and the reliability of inspection results.

3. Thermal Instrumentation and Equipment

This section addresses the selection, performance, and limitations of temperature measurement and infrared imaging instruments.

Important topics include:

  • Infrared cameras and thermal imaging systems

  • Contact and noncontact thermometers

  • Thermocouples and resistance temperature detectors

  • Thermistors and temperature indicators

  • Infrared pyrometers

  • Infrared line scanners

  • Photon detectors and thermal detectors

  • Cooled and uncooled infrared sensors

  • Infrared focal plane arrays

  • Spatial resolution and instantaneous field of view (IFOV)

  • Thermal sensitivity and noise-equivalent temperature difference (NETD)

  • Instrument calibration and performance verification

Candidates should be able to select suitable instruments for different inspection conditions and understand the factors influencing measurement uncertainty.

4. Infrared Testing Techniques and Applications

ASNT Level III candidates should understand how different thermographic techniques are applied in industrial testing.

Topics include:

  • Passive infrared thermography

  • Active thermography

  • Pulsed thermography

  • Thermal imaging and temperature mapping

  • Heat flux measurement

  • Thermal resistance and capacitance investigations

  • Exothermic and endothermic investigations

  • Friction-related investigations

  • Fluid flow investigations

  • Inspection setup and equipment selection

  • Inspection limitations and environmental considerations

These techniques may be applied to electrical systems, mechanical equipment, composite materials, manufacturing processes, and other industrial applications.

5. Interpretation and Evaluation of Thermal Results

Interpretation is an important Level III responsibility because unusual thermal patterns do not always indicate actual defects.

Candidates should understand:

  • Thermal image interpretation

  • Temperature distribution analysis

  • Relevant and non-relevant indications

  • Reflected radiation and apparent temperature

  • Influence of emissivity on temperature measurement

  • Thermal contrast

  • Detection limitations

  • Equipment and environmental effects

  • Evaluation against applicable procedures and acceptance criteria

  • Documentation of inspection findings

A Level III professional must be able to distinguish genuine thermal conditions from misleading indications caused by reflection, surface characteristics, or operating conditions.

6. Infrared Testing Procedures and Documentation

The examination also includes knowledge of written procedures and technical inspection requirements.

Important topics include:

  • Developing infrared testing procedures

  • Selecting appropriate equipment and techniques

  • Inspection planning

  • Procedure qualification and verification

  • Equipment calibration requirements

  • Inspection reporting

  • Interpretation criteria

  • Quality assurance

  • Applicable industry codes, specifications, and standards

7. Safety and Health Requirements

Safety is an important part of professional infrared inspection activities.

Candidates should understand safety responsibilities involving personnel, clients, facilities, and testing equipment.

Important subjects include electrical safety, hot surfaces, hazardous industrial environments, equipment handling, and safe inspection practices.

ASNT IR Level III Exam Eligibility Requirements

ASNT evaluates candidates’ documented education and relevant NDT work experience.

Its published pathways include:

Educational Qualification Minimum Relevant NDT Experience
Four-year engineering or physical science degree 12 months / 252 days
Two academic years of engineering or physical science study 24 months / 504 days
No college education 48 months / 1,008 days

Experience must meet the ASNT program requirements, including qualifying work in the applicable testing method. Applicants must provide acceptable supporting documentation.

Review the complete ASNT NDT Level III certification requirements before applying.

How to Prepare for the ASNT IR Level 3 Examination

A successful preparation strategy should combine theoretical understanding with inspection experience and regular practice.

Step 1: Review the official examination syllabus.

Study ASNT’s published Thermal/Infrared Testing examination outline to understand the scope of the Method Examination.

Step 2: Strengthen your understanding of heat transfer and radiation.

Pay particular attention to emissivity, blackbody radiation, thermal conductivity, radiation laws, and temperature measurement.

Step 3: Understand thermal imaging equipment.

Review detector technologies, camera performance, instrument calibration, spatial resolution, and measurement limitations.

Step 4: Practice numerical calculations.

Work through problems involving temperature conversion, heat transfer, thermal radiation, emissivity, and imaging geometry.

Step 5: Study real industrial applications.

Review inspection scenarios involving electrical components, mechanical systems, composites, insulation, and process equipment.

Step 6: Complete ASNT IR Level III practice tests.

Use practice questions to identify weaknesses and improve technical reasoning.

Step 7: Prepare separately for the NDT Level III Basic Examination.

The Basic Examination covers broader NDT principles, certification, personnel qualification, materials and processes, and technical responsibilities. Candidates taking the Basic exam in 2026 should review the relevant 2024 editions of ASNT SNT-TC-1A and CP-189, along with ASNT’s current recommended references.

Buy ASNT IR Level III Exam Question Bank and Self-Study Material

Looking for additional ASNT Infrared/Thermal Testing Level III practice questions and self-study resources?

UpWeld also offers a paid examination preparation question bank for candidates who want more practice beyond the free online quiz.

ASNT IR Level 3 Exam Learning Package

Study Material Details Information
Exam ASNT IR Level III – Infrared/Thermal Testing
Practice Question Bank 500+ Questions
Content Theory, Applications, Practical Scenarios, and Numerical Questions
Price $25.00 USD
Availability Contact UpWeld to confirm current package contents and delivery formats

How to Purchase

Email: upweld.org@gmail.com

WhatsApp: Contact UpWeld on WhatsApp

The question bank is intended to support independent study, improve subject understanding, and provide additional examination practice.

Contact UpWeld for information about available study guidance, question explanations, online materials, and printable resources.

Please note: These are examination preparation materials, not official ASNT examination questions. Purchasing study materials does not guarantee a passing score or certification.

Take More Free ASNT NDT Level III Practice Tests

Preparing for more than one NDT method? UpWeld provides additional practice tests for several ASNT Level III examination subjects.

NDT Examination Free Practice Test
Liquid Penetrant Testing (PT/LPT) Level III Start PT Level III Practice Test
Magnetic Particle Testing (MT) Level III Start MT Level III Practice Test
Radiographic Testing (RT) Level III Start RT Level III Practice Test
Ultrasonic Testing (UT) Level III Start UT Level III Practice Test
Acoustic Emission Testing (AE) Level III Start AE Level III Practice Test
Electromagnetic Testing (ET) Level III Start ET Level III Practice Test

 

Start Your Free ASNT IR Level 3 Practice Test Today

Preparing for the ASNT Infrared/Thermal Testing Level III examination requires a solid understanding of thermal science, infrared instruments, inspection techniques, and technical interpretation.

Regular practice can help you recognize gaps in your knowledge, strengthen your calculation skills, and improve your familiarity with examination-style questions.

Take the Free ASNT NDT IR Level III Practice Test above and check your knowledge today.

After completing the quiz, share your score or questions in the comments section below. Your feedback can also help other NDT professionals preparing for their certification examinations.

For additional ASNT IR Level III study materials, examination preparation resources, or training enquiries, contact upweld.org@gmail.com.

Disclaimer: UpWeld is an independent examination preparation resource and is not affiliated with, endorsed by, or officially approved by ASNT. Certification requirements, exam details, and fees are determined by ASNT and may change. Always verify current requirements through the official ASNT website.

Frequently Asked Questions About ASNT IR Level III
1. How many questions are in the ASNT IR Level 3 exam?

The ASNT NDT Thermal/Infrared Testing Level III Method Examination contains 90 multiple-choice questions, with a time limit of 2 hours, according to ASNT’s published examination information.

2. Is the ASNT IR Level 3 practice test free?

Yes. UpWeld provides a free online ASNT NDT IR Level III practice quiz. Additional paid preparation materials are available separately.

3. What is the difference between IR Level II and Level III?

IR Level II personnel typically carry out inspections, interpret results, and prepare reports within their authorized responsibilities.
IR Level III professionals have more advanced technical responsibilities, potentially including procedure development, technical supervision, interpretation of requirements, training, and inspection program oversight.
Actual duties and authorization depend on the applicable certification program and employer requirements.

4. What topics should I focus on for the IR Level III exam?

Focus on heat transfer, radiation principles, emissivity, thermal imaging equipment, temperature measurement, thermal inspection techniques, image interpretation, procedures, and safety.

5. Does passing the IR Method Examination automatically provide Level III certification?

No. Candidates must satisfy the applicable education and experience requirements, meet the program’s administrative requirements, and complete all required examinations. For initial ASNT NDT Level III certification, this includes the NDT Basic Examination and at least one Method Examination.

6. Are UpWeld practice questions the same as the actual ASNT examination questions?

No. UpWeld’s questions are intended for independent examination preparation. They should not be considered official ASNT examination questions or a prediction of the questions on a certification exam.

7. How can I purchase the ASNT IR Level III question bank?

You can contact UpWeld at upweld.org@gmail.com or through WhatsApp for details about the $25 USD study package.

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