100+ Free API QUPA Practice Questions

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In phased array ultrasonic testing, what is a focal law?

A government regulation for PAUT inspection

The set of time delays applied to each element in the aperture to form, steer, and focus the beam

The minimum frequency allowed for PAUT probes

A formula for calculating acceptance thresholds

to track

2026 Statistics

Key Facts: API QUPA Exam

75 in

Total Weld Length

4 test specimens

8 hrs

Exam Day

Performance demo

Pass/Fail

Grading

Threshold based

$750-$850

Exam Fee

Member / Non-Member

ASME V

Primary Reference

Article 4 + CC 2235

3 yrs

Certification Validity

API ICP

API QUPA is a performance-demonstration exam lasting one 8-hour workday (0800-1700) on four qualification test specimens (approximately 75 linear inches of welds across 0.25 inch to 1.00 inch flat plate and 2-12 inch diameter pipe). Prerequisite is a current Level II UT certification from ASNT, CGSB, PCN, or an ISO 9712 accredited body. The fee is $750 for API members and $850 for non-members. Scoring is pass/fail based on thresholds for missed detections, missed characterizations, missed flaw positions, and false calls. Reference standards include ASME Section V Article 4, ASME Code Case 2235, API 1104, and ASNT SNT-TC-1A.

Sample API QUPA Practice Questions

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

1In phased array ultrasonic testing, what is a focal law?

A.A government regulation for PAUT inspection

B.The set of time delays applied to each element in the aperture to form, steer, and focus the beam

C.The minimum frequency allowed for PAUT probes

D.A formula for calculating acceptance thresholds

Explanation: A focal law is the programmed set of time delays (in nanoseconds) applied to each active element in the probe aperture. By firing elements at slightly different times, constructive interference forms a wavefront that can be steered to a desired angle and focused at a chosen depth. Exam tip: Every angle in an S-scan corresponds to its own focal law, which is why S-scans can have hundreds of focal laws in a single inspection.

2Which physical principle explains how the individual element wavefronts combine to form a coherent phased array beam?

A.Snell's law

B.Huygens principle of wavelet superposition

C.Ohm's law

D.Archimedes principle

Explanation: Huygens principle states that every point on a wavefront can be treated as a source of secondary spherical wavelets. In PAUT, each element acts as a Huygens source; when the wavelets are timed correctly with focal law delays, constructive interference forms a steered, focused beam. Exam tip: Snell's law still applies to refraction across the wedge-part interface, but Huygens explains the beam formation itself.

3What is the near-field length of a 5 MHz, 16-element linear array where the active aperture is 16 mm long and the material velocity in steel is 5900 m/s?

A.About 54 mm

B.About 108 mm

C.About 27 mm

D.About 216 mm

Explanation: Near-field length for a rectangular aperture is approximately N = A squared times f divided by 4 times velocity, where A is the larger aperture dimension. With A = 16 mm, f = 5 MHz, v = 5900 m/s: N = (0.016 squared times 5 million) divided by (4 times 5900) = 0.01085 m, or roughly 54 mm in steel when you include the elongation factor for rectangular apertures. Exam tip: Focusing is only effective within the near field — you cannot focus a PAUT beam beyond N.

4What happens to PAUT beam focusing capability beyond the natural near-field length of the active aperture?

A.Focusing becomes sharper

B.Focusing is not possible — the beam naturally diverges

C.The beam automatically refocuses at 2N

D.The beam reverses direction

Explanation: A phased array beam can only be focused within its near-field length N. Beyond N the beam is in the far field and diverges naturally based on aperture size and frequency; applying focal delays will not create a sharper beam. Exam tip: When scanning thick sections, choose a probe with a longer aperture so N extends beyond the deepest point of interest, or use multiple focal depths.

5What is the element pitch of a linear phased array probe?

A.The total length of the probe

B.The center-to-center distance between adjacent elements

C.The frequency of the probe

D.The wedge angle

Explanation: Pitch (p) is the center-to-center distance between adjacent elements, typically expressed in millimeters. Pitch, together with element width and kerf, determines beam steering range and grating lobe behavior. Exam tip: Smaller pitch gives wider steering range, which is why high-resolution PAUT probes use fine-pitch arrays.

6What causes grating lobes in a phased array beam?

A.Too much couplant on the wedge

B.Element pitch larger than half the wavelength in the test material

C.A cracked element

D.Temperature above 40 degrees Celsius

Explanation: Grating lobes are unwanted secondary beams that appear when element pitch exceeds approximately one-half wavelength in the propagation medium. They can produce false indications by reflecting off geometry outside the intended beam direction. Exam tip: To minimize grating lobes, use fine-pitch probes and limit steering range when possible.

7What is the primary advantage of an S-scan (sectorial scan) over a conventional fixed-angle UT scan?

A.It uses less couplant

B.A single probe position can sweep a range of refraction angles through the weld volume

C.It works without calibration

D.It eliminates the need for a written procedure

Explanation: An S-scan electronically steers the beam through a range of angles (for example 40 to 70 degrees) from one probe position, providing multi-angle coverage of the weld volume without moving the probe. This dramatically reduces scan time and improves flaw detectability on complex geometries. Exam tip: An S-scan still requires valid calibration for every angle in the sweep, typically achieved with ACG/TCG.

8In a linear (E-scan) phased array scan, how does the beam move across the probe?

A.The refraction angle changes while the aperture stays fixed

B.The active aperture is electronically stepped along the probe while the refraction angle stays fixed

C.The probe physically rotates

D.The wedge angle changes with each pulse

Explanation: In a linear or E-scan, a fixed-size active aperture (for example 16 elements) is stepped one element at a time along the array. The refraction angle stays constant; what changes is the physical position of the beam exit point. Exam tip: E-scans are the PAUT equivalent of moving a conventional probe along the weld, but much faster and with consistent couplant and index.

9Why is Snell's law important when designing a PAUT scan plan?

A.It is used to calculate battery life

B.It determines the refraction angle in the part based on the wedge angle and the velocity ratio between the wedge and the part

C.It sets the passing score for the exam

D.It controls the probe frequency

Explanation: Snell's law relates the incident angle in the wedge to the refracted angle in the test material using the ratio of sound velocities. It is essential for designing wedges and selecting focal law steering ranges so the desired refraction angles can actually be produced without mode conversion issues. Exam tip: Beyond the first critical angle longitudinal waves disappear; beyond the second critical angle shear waves also vanish.

10What is the approximate first critical angle for a longitudinal wave travelling from a Rexolite wedge (velocity about 2337 m/s) into steel (longitudinal velocity about 5900 m/s)?

A.About 14 degrees

B.About 23 degrees

C.About 33 degrees

D.About 57 degrees

Explanation: The first critical angle is where the refracted longitudinal wave reaches 90 degrees in the part. Using Snell's law with sine of incident divided by wedge velocity equals sine of 90 divided by steel L velocity, the incident angle is arcsine of 2337 divided by 5900 which equals approximately 23.3 degrees. Exam tip: Beyond the first critical angle only shear waves propagate in the part, which is why most weld inspections use shear wave wedges.

About the API QUPA Exam

The API QUPA exam (now administered as QUTE-PA) is the Qualification of Ultrasonic Testing Examiners (Phased Array) certification from the American Petroleum Institute. It is a hands-on performance demonstration in which candidates use their own phased array ultrasonic (PAUT) equipment and written procedure to detect, characterize, size, and report flaws on approximately 75 linear inches of flat plate and pipe welds over a single eight-hour workday. API QUPA is the industry benchmark for PAUT examiners supporting fitness-for-service (FFS) and risk-based inspection (RBI) decisions on pressure equipment and piping. Certification is valid for three years.

Questions

100 scored questions

Time Limit

8-hour workday (performance demonstration)

Passing Score

Pass/Fail (missed detections, missed characterizations, missed positions, false calls)

Exam Fee

$750 Member / $850 Non-Member (American Petroleum Institute (API ICP))

API QUPA Exam Content Outline

20%

PAUT Fundamentals & Physics

Beam forming, Huygens principle, element pitch/aperture, near-field length, focal laws, beam steering limits, and grating lobes

15%

Equipment, Probes & Wedges

Linear, matrix, and DMA probes; element count and frequency; wedge angle/velocity; encoders per ASME V Article 4

20%

Calibration & System Performance

Sensitivity, TCG, linearity checks, wedge delay, velocity, element activity per ASME V T-434 and Code Case 2235

15%

Scan Plans, Techniques & Coverage

Sectorial and linear scans, encoded line scans, index offset, skew angle, multi-group setup for full weld coverage

15%

Data Interpretation & Imaging

A/B/C/D/S-scan views, gate setup, geometric vs. flaw indications, SNR, saturation

10%

Flaw Sizing & Characterization

6 dB drop, 20 dB drop, tip diffraction, through-wall height, length sizing, and flaw type discrimination

Codes, Acceptance & Documentation

ASME B31.3, API 1104, ASME Section VIII acceptance; SNT-TC-1A; written procedures and indication tables

How to Pass the API QUPA Exam

What You Need to Know

Passing score: Pass/Fail (missed detections, missed characterizations, missed positions, false calls)
Exam length: 100 questions
Time limit: 8-hour workday (performance demonstration)
Exam fee: $750 Member / $850 Non-Member

Keys to Passing

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

API QUPA Study Tips from Top Performers

1Master focal law theory — know that the delay applied to each element in the aperture determines the beam angle and focal depth, and that steering range is limited by element pitch (grating lobes appear when pitch exceeds half the wavelength per ASME V T-434.2)

2Run the full linearity check suite before every mock session — amplitude linearity within 20 percent, horizontal linearity within 2 percent of full screen, and element activity within 6 dB of the average, as required by ASME Section V T-434.2.1 and Code Case 2235

3Build TCG on a proper calibration block — use side-drilled holes at multiple depths to flatten amplitude response across the sound path, then verify that indications equal the reference level within plus or minus 2 dB across the entire sweep

4Practice tip diffraction sizing on known notches — identify the upper and lower tip signals, measure time-of-flight difference, and calculate through-wall height using the wedge velocity. Target sizing accuracy within plus or minus 1.5 mm on the actual test

5Differentiate geometric from flaw indications — root bead, counterbore, and weld cap reflections follow predictable geometry. Walk the probe and confirm whether the indication moves with the geometry (likely benign) or stays fixed in the weld volume (likely a flaw)

Frequently Asked Questions

What score do I need to pass the API QUPA exam?

API QUPA is graded pass/fail. There is no percentage score. You must stay below published thresholds for missed detections, missed characterizations, missed flaw positions, and false calls across the four qualification test specimens. Results are reviewed at the end of the session and forwarded to API for concurrence, then sent to you or your employer. Because the thresholds are strict, most failures come from false calls on geometric reflectors (root, counterbore) and from undersized through-wall height on cracks. Our 100 practice questions help you build the theory foundation that drives correct calls on the actual demonstration.

Is the API QUPA exam open-book or closed-book?

API QUPA is neither — it is a hands-on performance demonstration. There is no written multiple-choice component. Candidates bring their own PAUT instrument, probes, wedges, couplant, cables, and written procedure to the API-designated test site. You perform live calibration, scan the test specimens, interpret the data, and complete indication tables and a final report within the 8-hour workday. You may reference your own written procedure during the test, but you may not discuss specimens with other candidates.

How hard is the API QUPA exam?

API QUPA is one of the most technically demanding NDT qualifications. It assumes you already hold Level II UT certification and strong PAUT hands-on experience. The difficulty comes from tight time pressure (8 hours for four specimens plus calibration and reporting), unfamiliar specimens that include realistic service flaws, and the pass/fail threshold on false calls. Candidates who complete at least 100 hours of hands-on PAUT work on representative welds and who thoroughly understand focal laws, TCG, and tip diffraction sizing have the best success rate.

Which references and standards cover the API QUPA body of knowledge?

The core references are ASME Boiler and Pressure Vessel Code Section V Article 4 (Ultrasonic Examination Methods for Welds), ASME Code Case 2235 (Use of Ultrasonic Examination in Lieu of Radiography), API 1104 (Welding of Pipelines and Related Facilities), ASNT SNT-TC-1A (personnel qualification), and the manufacturer procedures for the PAUT instrument you use. You should also know the acceptance criteria in ASME B31.3 for process piping and ASME Section VIII Division 1 Appendix 12 for pressure vessels. Our questions cite real section numbers from these standards.

What jobs can I get with API QUPA certification?

API QUPA certified examiners are in high demand across refining, petrochemical, pipeline, and power industries. Typical roles include PAUT technician, senior UT examiner, NDT supervisor, and inspection engineer supporting FFS and RBI programs. Salaries typically range from $85,000 to $150,000 depending on location, shift, and project scope. Because API QUPA is the recognized benchmark for phased array work on pressure equipment, holding it often unlocks access to major turnaround and new construction projects. It is frequently paired with API 510, 570, or 577 certifications.

How do I prepare for the API QUPA exam?

Start by reviewing ASME Section V Article 4 end-to-end and mastering focal law theory and TCG calibration. Spend at least 100 hours scanning representative flat plate and pipe welds with planted flaws using the same instrument and probes you will bring to the test. Build and validate a written procedure that complies with T-421 of ASME V. Practice with 6 dB drop and tip diffraction sizing on known reflectors. Use our 100 practice questions to lock in theory, then complete full 8-hour mock sessions with timed calibration, scanning, and reporting before your scheduled test date.