NDT Study Guide 2026

Everything you need to pass the NDT exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.

📋 NDT Exam Format at a Glance

Questions

120 min

Time Limit

70%

Passing Score

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📚 NDT Topics to Study (63)

Penetrant Testing · 11 cards Ultrasonic Testing · 11 cards Acoustic Emission Testing · 7 cards Acoustic Emission Testing · 7 cards Acoustic Emission Testing · 7 cards Certification and Practices · 7 cards Certification and Practices · 7 cards Certification and Practices · 7 cards Certification and Practices · 7 cards Codes and Standards · 7 cards Codes and Standards · 7 cards Codes and Standards · 7 cards Codes and Standards · 7 cards Discontinuity Interpretation and Evaluation · 7 cards Discontinuity Interpretation and Evaluation · 7 cards Discontinuity Interpretation and Evaluation · 7 cards Discontinuity Interpretation and Evaluation · 7 cards Eddy Current Testing Theory · 7 cards Eddy Current Testing Theory · 7 cards Eddy Current Testing Theory · 7 cards Eddy Current Testing Theory · 7 cards Leak Testing Techniques · 7 cards Leak Testing Techniques · 7 cards Leak Testing Techniques · 7 cards Leak Testing Techniques · 7 cards Liquid Penetrant Testing Process · 7 cards Liquid Penetrant Testing Process · 7 cards Liquid Penetrant Testing Process · 7 cards Liquid Penetrant Testing Process · 7 cards Magnetic Particle Testing Methods · 7 cards

See all 63 topics as flashcards →

✍️ Sample NDT Questions & Answers

1. An eddy current scan of a heat exchanger tube shows a signal whose depth reading is 80% through-wall. Per most fitness-for-service criteria, this tube should be:

✓ Plugged or repaired immediately

Most industry standards (ASME, TEMA) require plugging or repair of heat exchanger tubes when wall loss reaches or exceeds 40–80% depending on code; 80% typically requires immediate action.

2. Which type of radiation has the greatest penetrating power?

✓ Gamma rays

Gamma rays are highly penetrating electromagnetic radiation requiring dense shielding materials like lead or concrete.

3. At what temperature range is standard liquid penetrant testing considered valid per ASTM E165?

✓ 50°F to 125°F (10°C to 52°C)

ASTM E165 specifies the standard temperature range for PT as 50°F to 125°F (10°C to 52°C) without special qualification.

4. For aerospace NDT applications, which specification is most commonly referenced for personnel certification requirements?

✓ NAS 410 (now ATA Spec 105)

NAS 410, now superseded and aligned with ATA Spec 105, governs qualification and certification of NDT personnel specifically in the aerospace industry.

5. In ASME B31.3 Process Piping, what is the required volumetric examination percentage for normal fluid service welds?

✓ 10%

ASME B31.3 requires 5% random radiographic or ultrasonic examination of welds in normal fluid service as the base examination requirement.

6. When using the continuous method of magnetic particle testing, particles are applied:

✓ While the magnetizing current is flowing

In the continuous method, magnetic particles are applied while the magnetizing current is actively flowing, taking advantage of the stronger applied field rather than only residual magnetism.

🎯 Free NDT Practice Tests

Penetrant Testing · 11 questions Ultrasonic Testing · 11 questions Certification and Practices · 7 questions Magnetic Particle Testing Methods · 7 questions Magnetic Particle Testing Methods · 7 questions Magnetic Particle Testing Methods · 7 questions Magnetic Particle Testing Methods · 7 questions Acoustic Emission Testing · 7 questions Acoustic Emission Testing · 7 questions Certification and Practices · 7 questions

📖 NDT Guides & Articles

Your NDT Study Path

1. Learn with Flashcards → 2. Drill Practice Tests → 3. Take the Full Exam Simulation

🃏 NDT Flashcards (439)🏆 NDT Exam Simulation

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