ASNT Radiographic Testing - Level III Practice Questions — 10 Free (2026)

An MT Level II candidate scores 76 on the general, 88 on the specific, and 90 on the practical examination. Using the simple averaging method of SNT-TC-1A, what composite grade, in percent, should you record?

• A. 78.0
• B. 80.4
• C. 82.5
• D. 83.9
• E. 84.7 ✓

For Level I and Level II candidates the composite is the simple average of the three examination grades, giving 254 divided by 3, or about 84.7 percent, which also clears the 80 percent passing threshold. ASNT Level III Study Guide Basic, Section 1 - SNT-TC-1A Paragraph 8.1.2

An exposure of 4 min is correct at 600 mm. The technique moves the source back to 900 mm with everything else held. What exposure is then needed?

• A. 6.0 min
• B. 7.5 min
• C. 9.0 min ✓
• D. 10.5 min
• E. 12.0 min

Radiation spreads over an area that grows with the square of the distance, so the time has to grow in the same proportion to deliver the same amount. ASTM E94 radiographic examination guide, exposure factors

A newly hired trainee in your MT department is progressing through organized training. Until qualified and certified, SNT-TC-1A intends that the trainee:

• A. may report test results after 40 hours of instruction
• B. shall be restricted from entering the testing area until the general examination is passed and documented
• C. must not on their own conduct tests or interpret, evaluate, or report any test results ✓
• D. may evaluate indications if a Level I observes
• E. may independently perform tests but not sign reports

A trainee works alongside a certified individual while gaining experience. Independent testing, interpretation, evaluation, and reporting are all reserved for certified personnel. ASNT Level III Study Guide Basic, Section 1 - SNT-TC-1A Paragraph 4.2

Under SNT-TC-1A, examinations administered for qualification should result in a passing composite grade of at least what value?

• A. 60 percent
• B. 65 percent
• C. 70 percent
• D. 75 percent
• E. 80 percent ✓

The recommended pass point for the composite is 80 percent, and in addition no individual examination may fall below a passing grade of 70 percent. ASNT Level III Study Guide Basic, Chapter 2 - Recommended Practice No. SNT-TC-1A

An eddy current procedure on a given alloy produces a standard depth of penetration of 0.5 mm at 100 kHz. If the Level III revises the technique to operate at 25 kHz on the same material, the new standard depth of penetration is approximately:

• A. 0.25 mm
• B. 0.5 mm
• C. 0.71 mm
• D. 1.0 mm ✓
• E. 2.0 mm

For a fixed material, standard depth of penetration varies inversely with the square root of frequency. Cutting the frequency to one quarter therefore doubles the penetration depth. ASNT Level III Study Guide Basic, Section 2 - Electromagnetic Testing

Fluorescent penetrant and fluorescent magnetic particle examinations are carried out under UV-A illumination. The wavelength, in nanometers, on which standard UV-A inspection lamps are centered is:

• A. 254
• B. 320
• C. 365 ✓
• D. 400
• E. 550

Inspection lamps are filtered to emit near 365 nm, the UV-A line that excites fluorescent dyes efficiently while excluding the more hazardous shorter wavelengths such as the 254 nm germicidal line. ASNT Level III Study Guide Basic, Section 2 - Liquid Penetrant Testing, Fundamentals

Ranked by photon energy, the most energetic radiation routinely encountered in an NDT facility is:

• A. UV-A from an inspection lamp
• B. white light reflected at the examination surface
• C. infrared emission mapped by a thermal imager
• D. visible green light from a fluorescent indication
• E. gamma photons from a cobalt-60 source ✓

Photon energy rises as wavelength shortens, and cobalt-60 emissions sit at the extreme short wavelength end of anything used in the shop, far above ultraviolet, visible and infrared light. That is also why only the radiographic sources are ionizing. ASNT Level III Study Guide Basic, Section 2 - Radiographic Testing 1.1.3

While approving a training course for MT Level I qualification, you need the recommended topical outline. Following the 2006 editions, the training course outlines formerly printed in SNT-TC-1A and CP-189 are now published in:

• A. the Nondestructive Testing Handbook
• B. ANSI/ASNT CP-105 ✓
• C. the Materials Evaluation journal
• D. CP-189 Annex A
• E. SNT-TC-1A Appendix B

Consolidating the outlines into the single CP-105 document removed the risk of two conflicting outline sets, and both certification documents now point trainers to it for topical content. ASNT Level III Study Guide Basic, Section 1 - SNT-TC-1A Section 7 and CP-189 Section 4 (topical outlines)

A candidate fails the specific examination. If no suitable additional training is provided, SNT-TC-1A recommends the candidate wait at least how many days before reexamination?

• A. 10 days
• B. 20 days
• C. 30 days ✓
• D. 45 days
• E. 90 days

Candidates who fail to attain the required grades should either wait at least one month or receive suitable additional training, as determined by the Level III, before being reexamined. ASNT Level III Study Guide Basic, Chapter 2 - Recommended Practice No. SNT-TC-1A

During field radiography the measured dose rate is 16 mSv per hour (1600 mrem per hour) at 2 m from the source. The boundary must be posted where the rate falls to 0.25 mSv per hour (25 mrem per hour). Ignoring attenuation, the boundary distance in meters is:

• A. 4
• B. 8
• C. 12
• D. 16 ✓
• E. 32

The required intensity reduction factor is 64, and by the inverse square law the distance must grow by the square root of that factor, which is 8 times the original 2 m. ASNT Level III Study Guide Basic, Section 2 - Radiographic Testing 1.1.4