ASNT NDT Level III - Basic Examination Practice Questions — 10 Free (2026)

Ragged, discolored cracks are found at the junctions between heavy bosses and thin walls of a sand casting, present before any machining or service. They most likely formed because:

• A. excess core moisture caused a violent blow
• B. hydrogen dissolved in the melt precipitated at the grain boundaries long after the casting had cooled to room temperature
• C. contraction of restrained sections tore the metal while it was still near the solidus and very weak ✓
• D. the metal was poured too cold
• E. the gating system froze prematurely

Hot tears occur at hot spots where geometry restrains solidification shrinkage, tearing metal that is still partially solidified and has almost no strength. ASNT Level III Study Guide Basic, Chapter 8 - Castings

A Level III is asked whether liquid penetrant testing can be used to find subsurface porosity in a machined aluminum housing. The correct response is that PT:

• A. finds subsurface flaws if fluorescent penetrant and extended dwell times are used
• B. reveals only discontinuities that are open to the test surface ✓
• C. works for subsurface flaws when the part is heated first
• D. detects flaws up to 6 mm below the surface
• E. detects subsurface flaws only in nonmagnetic materials

Penetrant must physically enter a discontinuity from the surface, so any flaw with no surface opening cannot be detected regardless of penetrant type, dwell, or part temperature. A volumetric method such as RT or UT is needed for wholly internal porosity. ASNT Level III Study Guide Basic, Section 2 - Liquid Penetrant Testing

An applicant for an employer Level III position under CP-189 presents a valid ASNT NDT Level III certificate endorsed in MT. Which examination obligation remains before the employer may certify the applicant in MT?

• A. A vision test only.
• B. A thirty question examination prepared by the employer covering its own specifications and standards for the method. ✓
• C. Retaking the ASNT Method Examination under employer proctoring.
• D. The full ASNT Basic Examination repeated at an authorized examination center so the employer can review the numerical grade before granting certification.
• E. None; the ASNT certificate completes all examination criteria.

The ASNT endorsement satisfies only the Basic and Method examination criteria; the employer must still administer its Specific Examination, plus practical or procedure demonstrations where applicable. ASNT Level III Study Guide Basic, Section 1 - Overview of ANSI/ASNT CP-189

Individual measurements from a stable process follow an approximately normal distribution. About what portion of the values is expected to fall within plus or minus two standard deviations of the mean?

• A. 33 percent
• B. 50 percent
• C. 68 percent
• D. 95 percent ✓
• E. 99.7 percent

For a normal distribution roughly two thirds of values lie within one standard deviation, about nineteen in twenty within two, and nearly all within three. ASNT Level III Study Guide Basic, Chapter 17 - Inspection

A specification cited on a purchase order invokes ASTM E1444, while the shop's legacy MT procedure cites only ASTM E709. In sorting out the obligations, the Level III should recognize that:

• A. E709 automatically overrides E1444 because guides carry the broader scope
• B. the two documents are interchangeable editions of one text
• C. ASTM practices apply only to government work, so a commercial order cannot invoke E1444
• D. both documents became binding on every laboratory the day ASTM published them, whether or not any contract, code or purchase order has ever referenced either one
• E. E709 is a guide offering direction without mandatory provisions, while E1444 is a practice that imposes requirements once contractually invoked ✓

ASTM distinguishes document types: a guide collects options and advice, whereas a practice states requirements that bind the parties when a contract or code calls it out. Consensus standards carry no force on their own publication; invocation is what makes them enforceable. ASNT Level III Study Guide Basic, Section 1 Chapter 1 - Administration of a Personnel Qualification and Certification Program

Under SNT-TC-1A Section 8.8, an employer may waive the Level III specific examination for a candidate only under which condition?

• A. The candidate passed the Basic examination with a grade above 90. though no later review tests the assumption again
• B. The candidate holds a valid ASNT Level III certificate in any method, together with a letter from a previous employer confirming at least five years of satisfactory performance as the certifying authority for that employer's product lines.
• C. The written practice simply declares specific examinations optional. with the open point closed on the earlier wording
• D. The candidate holds a valid ASNT NDT Level III or ACCP Professional Level III certificate in the method, plus documented experience including preparation of procedures to codes and standards and evaluation of test results. ✓
• E. The candidate accumulated ten years of Level II experience in the method. and the residual risk is fixed by convention rather than examination

The waiver turns on two things together: a current ASNT or ACCP Level III credential in the same method, and documented experience that covers drafting procedures against the governing codes and specifications and judging test results. A credential in another method, or seniority by itself, will not do. ASNT Level III Study Guide Basic, Chapter 2 - Recommended Practice No. SNT-TC-1A

Ultrasonic indications cluster along the centerline of hot-rolled bar stock, and the mill investigation traces the affected lengths to the top end of a conventionally poured ingot that was insufficiently cropped before rolling. The Level III should identify the discontinuity as:

• A. hydrogen flaking
• B. grinding checks
• C. centerline hot tears that formed as the bar cooled unevenly on the run-out table after rolling
• D. seams introduced during final sizing passes
• E. pipe drawn out from the unfed shrinkage cavity at the ingot top ✓

An ingot solidifies from the outside inward and leaves an unfed shrinkage cavity at its top; if that region is not fully cropped, rolling elongates the void into centerline pipe. ASNT Level III Study Guide Basic, Chapter 5 - Ferrous Metals

Per SNT-TC-1A Section 8.8, the Level III Basic examination assembled by an employer should contain, at minimum, fifteen questions on the SNT-TC-1A document, twenty questions on materials, fabrication, and product technology, and thirty questions that are:

• A. drawn from the specific examination
• B. devoted to the administration of the written practice
• C. patterned after published Level II questions from other relevant NDT methods ✓
• D. focused on interpreting the codes, standards, and specifications that govern the employer's principal product line
• E. employer procedure based

The third block of the basic examination checks cross-method literacy by using items comparable to Level II questions in methods other than the one being examined. Code interpretation questions belong to the method examination instead. ASNT Level III Study Guide Basic, Section 1 - SNT-TC-1A Paragraph 8.8.1

A control chart plots the mean and the range of small subgroups measured at regular intervals. Together the two plots monitor:

• A. the fraction of the lot already inspected, letting the crew predict when the inspection station will complete the order
• B. the central tendency and the dispersion of the process ✓
• C. operator attendance and total shift output
• D. gage wear and gage resolution only
• E. tolerance stack-up in assemblies

The chart of subgroup means follows where the process is centered, while the range chart follows how much it spreads; together they describe location and variability. ASNT Level III Study Guide Basic, Chapter 17 - Inspection

Ultrasonic indications cluster along the centerline of hot-rolled bar stock, and the mill investigation traces the affected lengths to the top end of a conventionally poured ingot that was insufficiently cropped before rolling. The Level III should identify the discontinuity as:

• A. hydrogen flaking
• B. grinding checks
• C. centerline hot tears that formed as the bar cooled unevenly on the run-out table after rolling
• D. seams introduced during final sizing passes
• E. pipe drawn out from the unfed shrinkage cavity at the ingot top ✓

An ingot solidifies from the outside inward and leaves an unfed shrinkage cavity at its top; if that region is not fully cropped, rolling elongates the void into centerline pipe. ASNT Level III Study Guide Basic, Chapter 5 - Ferrous Metals