NDT Level III Technician Examination

NDT Level III Technician Examination Practice Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

1. The primary purpose of a Level III NDT technician is to:

• Perform routine inspections
• Operate NDT equipment
• Establish techniques, procedures, and training programs
• Document inspection results

Rationale: Level III technicians are responsible for developing procedures,

evaluating results, and ensuring compliance with standards.

• According to ASNT, the maximum experience allowed to qualify for

Level III without formal training is:

• 1 year
• 2 years 1 / 4

• 3 years
• 5 years

Rationale: ASNT requires a minimum of 5 years of experience for Level III

without formal Level II training.

3. The term “sensitivity” in radiographic testing refers to:

• Film exposure time
• Ability to detect small discontinuities
• Radiation intensity
• Film density

Rationale: Sensitivity in RT is the minimum flaw size that can be reliably

detected.

• In ultrasonic testing, the typical frequency range used for thickness

measurement is:

• 0.1–0.5 MHz
• 1–2 MHz
• 2–10 MHz
• 15–20 MHz

Rationale: UT for thickness measurement commonly uses frequencies in

the 2–10 MHz range to balance penetration and resolution.

5. Magnetic particle inspection is most effective on:

• Aluminum
• Ferromagnetic materials 2 / 4

• Titanium
• Copper

Rationale: MT relies on magnetic fields, which are only induced in

ferromagnetic materials.

6. The primary purpose of a calibration block is to:

• Train inspectors
• Establish sensitivity and reference for defect detection
• Hold the test piece steady
• Provide a decorative standard

Rationale: Calibration blocks are used to set equipment sensitivity and

validate detection capability.

7. Penetrant testing indications can be removed by:

• Water
• Solvent remover or water post-emulsification
• Magnetic field
• Ultrasonic energy

Rationale: PT relies on post-emulsification or solvent cleaning to remove

excess penetrant.

8. The “dead zone” in ultrasonic testing is:

• The back surface echo
• Region near the transducer where defects cannot be detected 3 / 4

• A region with high amplitude signals
• The area between two flaws

Rationale: The dead zone is a near-surface area where the transducer

cannot detect defects due to ring-down effects.

9. In eddy current testing, increasing coil frequency will:

• Increase penetration
• Decrease penetration and increase surface sensitivity
• Have no effect
• Decrease surface sensitivity

Rationale: Higher frequencies reduce penetration depth but improve

surface defect detection.

10. Visual inspection primarily detects:

• Internal cracks
• Surface discontinuities
• Subsurface corrosion
• Porosity in castings

Rationale: VT is limited to what can be seen with the eye, sometimes aided

by magnification or lighting.

11. The principle of radiographic testing relies on:

• Magnetic fields
• Differential absorption of X-rays or gamma rays
• / 4