Testing NDT Equipment Repair Practice Exam

FAA Repairman Certificate – Nondestructive Testing (NDT) Equipment Repair Practice Exam Questions And Correct Answers (Verified Answers) Plus Rationales 2026 Q&A | Instant Download Pdf

• What is the primary purpose of nondestructive testing (NDT)?
• To permanently alter the material properties
• To detect defects without damaging the part
• To detect defects without damaging the part
• To increase production efficiency

Rationale: NDT techniques allow inspection of materials or components for

defects while leaving them intact and serviceable.

• Which NDT method uses high-frequency sound waves to detect flaws?
• Radiographic Testing (RT)
• Ultrasonic Testing (UT)
• Eddy Current Testing (ET) 1 / 4

• Magnetic Particle Testing (MT)

Rationale: Ultrasonic testing employs high-frequency sound waves to

detect internal flaws or thickness variations in materials.

• In Radiographic Testing, what is the function of a radiographic film?
• To block X-rays
• To record the shadow image of internal defects
• To focus radiation
• To emit radiation

Rationale: The radiographic film captures the image created by variations

in X-ray absorption within the material, revealing defects.

• Which NDT method requires the material to be ferromagnetic?
• Penetrant Testing
• Radiography
• Magnetic Particle Testing
• Eddy Current Testing

Rationale: Magnetic Particle Testing is effective only on ferromagnetic

materials that can be magnetized.

5. The sensitivity of a dye penetrant inspection depends most on:

• The magnetic field strength 2 / 4

• The penetrant’s ability to enter small surface discontinuities
• The radiation exposure time
• The ultrasonic frequency

Rationale: Penetrant effectiveness depends on its ability to seep into and

highlight surface defects.

• Which of the following is NOT a step in liquid penetrant inspection?
• Application of penetrant
• Removal of excess penetrant
• Application of developer
• Application of magnetic field

Rationale: Liquid penetrant inspection does not use a magnetic field; that

applies only to magnetic particle testing.

• What type of current is typically used in eddy current testing?
• Direct current (DC)
• Alternating current (AC)
• Pulsed DC
• High voltage DC

Rationale: Eddy current testing requires alternating current to induce

circular currents in conductive materials.

• / 4

8. In ultrasonic testing, the most common coupling medium is:

• Oil
• Grease
• Water or gel
• Alcohol

Rationale: Water or gel serves as a coupling agent to transmit ultrasonic

energy efficiently between the transducer and the test material.

9. A film with dark and light areas in radiography represents:

• Density uniformity
• Variations in X-ray absorption
• Electrical conductivity
• Magnetic field strength

Rationale: Dark areas indicate higher X-ray penetration, while light areas

indicate denser regions that absorb more radiation.

• Which type of discontinuity can liquid penetrant testing detect?
• Surface-breaking cracks
• Internal voids
• Subsurface delaminations
• Porosity deep inside material

Rationale: Penetrant testing is limited to surface-breaking defects since the

penetrant cannot reach internal flaws.

• / 4