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100+ Free ASNT NDT III UT Practice Questions

Pass your ASNT NDT Level III Ultrasonic Testing (UT) Method Examination exam on the first try — instant access, no signup required.

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2026 Statistics

Key Facts: ASNT NDT III UT Exam

135

Multiple-Choice Questions

ASNT NDT Level III method exam

4 hrs

Exam Time Limit

ASNT Pearson VUE format

70%

Passing Score

ASNT certification rules

Basic

Exam Required First

ASNT method-exam prerequisite

5 yrs

Typical Recert Cycle

ASNT Level III certification

Pearson VUE

CBT Test Provider

ASNT testing partner

As of 2026, the ASNT NDT Level III UT method exam is a 135-question, 4-hour Pearson VUE CBT requiring 70% to pass and the Basic examination as a prerequisite. Expect heavy coverage of UT physics, calibration with IIW V1/V2 and ASME basic blocks, contact/immersion/TOFD/PAUT techniques, sizing (6-dB drop, AVG/DGS), and acceptance criteria from ASME Section V Article 4/5, AWS D1.1, and API 1104.

Sample ASNT NDT III UT Practice Questions

Try these sample questions to test your ASNT NDT III UT exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1Which type of ultrasonic wave has particle motion parallel to the direction of wave propagation?
A.Shear wave
B.Longitudinal (compressional) wave
C.Rayleigh (surface) wave
D.Lamb (plate) wave
Explanation: Longitudinal waves, also called compressional waves, have particle motion parallel to the direction of propagation. They are the fastest ultrasonic mode in solids and the type generated by a straight-beam contact transducer.
2Which type of ultrasonic wave has particle motion perpendicular to the direction of wave propagation?
A.Longitudinal wave
B.Shear (transverse) wave
C.Plate wave (symmetric mode)
D.Creeping wave
Explanation: Shear or transverse waves have particle motion perpendicular to the direction of propagation. Shear waves cannot propagate in liquids or gases and travel at roughly half the longitudinal velocity in the same solid.
3Approximately what is the longitudinal sound velocity in steel?
A.1,480 m/s
B.3,250 m/s
C.5,920 m/s
D.9,800 m/s
Explanation: The longitudinal sound velocity in carbon steel is approximately 5,920 m/s (0.233 in/μs). Shear velocity in the same steel is roughly 3,250 m/s.
4What is the wavelength of a 5 MHz longitudinal wave in steel where v = 5,920 m/s?
A.0.59 mm
B.1.18 mm
C.2.36 mm
D.5.92 mm
Explanation: Wavelength λ = v/f. For v = 5,920 m/s and f = 5,000,000 Hz, λ = 5,920/5,000,000 = 1.184 × 10⁻³ m, or about 1.18 mm.
5Acoustic impedance (Z) of a material is the product of:
A.Density and frequency
B.Density and sound velocity
C.Sound velocity and frequency
D.Density and wavelength
Explanation: Acoustic impedance Z = ρ × v, where ρ is the material density and v is the sound velocity. Z controls how much sound is reflected and transmitted at an interface.
6At a normal-incidence interface between two materials, reflection is highest when:
A.The acoustic impedances are nearly equal
B.The acoustic impedances differ greatly
C.The frequency is reduced
D.The wavelength matches the part thickness
Explanation: The reflection coefficient R = ((Z2 − Z1)/(Z2 + Z1))² increases as the impedance mismatch grows. A steel-to-air interface, for example, reflects nearly 100% of the incident energy.
7Snell's law for refraction at an interface is correctly stated as:
A.sin θ1 × v1 = sin θ2 × v2
B.sin θ1 / v1 = sin θ2 / v2
C.cos θ1 / v1 = cos θ2 / v2
D.tan θ1 × v2 = tan θ2 × v1
Explanation: Snell's law for ultrasonics is sin θ1 / v1 = sin θ2 / v2, where θ is measured from the normal and v is the wave velocity in each material. It governs both refraction and mode conversion at an interface.
8The first critical angle is the incident angle at which:
A.The refracted shear wave becomes a surface wave
B.The refracted longitudinal wave is parallel to the interface
C.All energy is reflected back into the wedge
D.Mode conversion stops occurring
Explanation: At the first critical angle, the refracted longitudinal wave reaches 90° in the second medium and travels along the surface. Beyond this angle only a shear wave propagates into the second medium, which is why angle-beam shear inspection uses incidence angles between the first and second critical angles.
9The second critical angle is the incident angle at which:
A.The refracted longitudinal wave reaches 90°
B.The refracted shear wave reaches 90°, producing a surface (Rayleigh) wave
C.Total transmission occurs across the interface
D.All beam energy mode converts to a Lamb wave
Explanation: At the second critical angle, the refracted shear wave reaches 90° in the second medium and produces a surface (Rayleigh) wave along the interface. Beyond it, no bulk wave propagates into the second material.
10Mode conversion at an interface most commonly occurs when:
A.The beam is exactly normal to the interface
B.The beam strikes the interface at an oblique angle
C.The interface is between two gases
D.The frequency exceeds 100 MHz
Explanation: Mode conversion happens at oblique incidence. A longitudinal wave striking an interface at an angle generates both refracted longitudinal and refracted shear components in the second medium, in addition to reflected longitudinal and shear waves on the first side.

About the ASNT NDT III UT Exam

The ASNT NDT Level III Ultrasonic Testing method examination certifies candidates with Level III responsibility for UT procedures, technique selection, calibration, and acceptance interpretation. Candidates must first pass the ASNT Basic exam, then sit the UT method exam at a Pearson VUE test center.

Assessment

135 multiple-choice questions covering UT physics, equipment, calibration, techniques, indications, evaluation, and applicable codes/standards.

Time Limit

4 hours

Passing Score

70%

Exam Fee

Tiered ASNT member/non-member fees (ASNT (American Society for Nondestructive Testing))

ASNT NDT III UT Exam Content Outline

20% topic emphasis

UT Principles & Physics

Longitudinal, shear, and surface (Rayleigh) waves; velocity, frequency, wavelength; acoustic impedance; attenuation; reflection and refraction; Snell's law; mode conversion; near-field and beam spread.

16% topic emphasis

Equipment & Transducers

Straight-beam, angle-beam, dual-element, focused, and phased array transducers; couplants; pulser-receiver settings; cabling; and damping/bandwidth basics.

18% topic emphasis

Calibration & Reference Standards

IIW V1/V2 blocks, DSC block, ASME basic calibration block, distance and sensitivity calibration, DAC, TCG, and AVG/DGS curve construction.

18% topic emphasis

Techniques

Contact and immersion testing, pulse-echo, through-transmission, TOFD, phased array (PAUT), and automated ultrasonic testing (AUT) fundamentals.

14% topic emphasis

Indications & Evaluation

Signal interpretation for cracks, porosity, lack of fusion, slag, and laminations; ID vs OD reflectors; 6-dB drop and max-amplitude sizing; and signal-to-noise considerations.

14% topic emphasis

Codes & Standards

ASME Section V Article 4 (UT of welds), Article 5 (UT of materials), AWS D1.1 ultrasonic acceptance criteria, API 1104 pipeline welds, ASTM E317/E797, and calibration interval rules.

How to Pass the ASNT NDT III UT Exam

What You Need to Know

  • Passing score: 70%
  • Assessment: 135 multiple-choice questions covering UT physics, equipment, calibration, techniques, indications, evaluation, and applicable codes/standards.
  • Time limit: 4 hours
  • Exam fee: Tiered ASNT member/non-member fees

Keys to Passing

  • Complete 500+ practice questions
  • Score 80%+ consistently before scheduling
  • Focus on highest-weighted sections
  • Use our AI tutor for tough concepts

ASNT NDT III UT Study Tips from Top Performers

1Memorize core UT physics relationships: wavelength λ=v/f, near-field length N=D²/4λ, and Snell's law sin θ1/v1 = sin θ2/v2.
2Build a quick-reference table of sound velocities in steel, aluminum, water, and Plexiglas for both longitudinal and shear waves.
3Drill IIW V1/V2 block uses: angle verification, exit-point check, sensitivity, and beam-index measurement.
4Practice 6-dB drop and 20-dB drop sizing logic so you can identify when each method applies to a reflector.
5Review ASME Section V Article 4 calibration requirements and acceptance flow versus AWS D1.1 amplitude-based dB rating rules.
6Compare TOFD strengths (through-wall sizing, no amplitude reliance) with pulse-echo and PAUT trade-offs.
7Memorize first and second critical angles and what mode conversion produces at each one.
8Work timed 135-question practice sets to pace at roughly 1.7 minutes per question while leaving review margin.

Frequently Asked Questions

How many questions are on the ASNT NDT Level III UT method exam?

The Level III UT method examination is 135 multiple-choice questions delivered as a Pearson VUE computer-based test. Candidates have 4 hours to complete the exam, and a 70% score is required to pass.

Do I need to pass the ASNT Basic exam first?

Yes. ASNT requires candidates to pass the NDT Level III Basic examination before sitting any method examination, including UT. The Basic exam covers SNT-TC-1A practice, materials, processes, and general NDT methods.

What does the UT method exam cover?

Expect UT physics (wave modes, Snell's law, impedance, near-field), equipment and transducers, calibration with IIW V1/V2 and ASME basic blocks, techniques such as contact, immersion, TOFD, and PAUT, evaluation and sizing methods, and acceptance criteria from ASME Section V, AWS D1.1, and API 1104.

Where do I take the exam?

ASNT delivers Level III method exams through Pearson VUE test centers worldwide. Candidates schedule the exam after ASNT approves their application and prerequisites are met.

How long is the Level III UT certification valid?

ASNT Level III certificates are typically valid for five years before recertification. Candidates can renew by reexamination or, where allowed, by approved continuing professional development under current ASNT recertification rules.

How much does the exam cost?

ASNT uses tiered member and non-member fees for the Level III method examinations. Refer to the current ASNT certification fee schedule for exact totals, as fees may include the Basic exam, method exam, and recertification when applicable.

What sizing methods should I master?

The 6-dB drop method, 20-dB drop, max-amplitude technique, and DAC/TCG-based amplitude evaluation are core. For TOFD, time-of-flight measurements between lateral wave and back-wall echoes determine through-wall extent.