Non-Destructive Testing Quiz

What is the main purpose of non-destructive testing (NDT) in aircraft?

• To replace defective parts immediately

• To detect flaws without causing damage

• To dismantle aircraft for thorough inspection

• To induce defects for testing purposes

Which organization is responsible for civil aviation safety in Australia?

• International Air Transport Association (IATA)

• Civil Aviation Safety Association (CASA)

• European Union Aviation Safety Agency (EASA)

• Federal Aviation Administration (FAA)

Which of the following is NOT an advantage of NDT?

• Tests can be repeated on the same item

• Equipment is often portable for field use

• Requires large capital investment

• Little or no specimen preparation is required

What is a limitation of NDT?

• It cannot be used on parts in-service

• It requires complete disassembly of components

• Results must often be interpreted by a skilled technician

• It can only be used on non-magnetic materials

Answer explanation

A key limitation of NDT is that results must often be interpreted by a skilled technician, as the data can be complex and requires expertise to ensure accurate assessments.

What is the primary use of dye penetrant testing?

• To measure material thickness

• To inspect welds for porosity

• To detect internal defects

• To detect surface defects

Answer explanation

Dye penetrant testing is primarily used to detect surface defects in materials. It involves applying a dye to the surface, which seeps into cracks or voids, making them visible for inspection.

Which type of radiation is used in radiographic inspection?

• X-rays and gamma rays

• Infrared rays

• Microwaves

• Ultraviolet rays

Answer explanation

X-rays and gamma rays are the types of radiation used in radiographic inspection due to their ability to penetrate materials and create images of internal structures, making them essential for this application.

What is the principle behind magnetic particle testing?

• Using magnetic fields to detect surface cracks

• Using sound waves to detect flaws

• Using radiation to create an image of the component

• Using dye to highlight surface defects

Answer explanation

Magnetic particle testing uses magnetic fields to detect surface cracks in ferromagnetic materials. When a magnetic field is applied, any surface or near-surface defects will disrupt the field, allowing for the identification of flaws.

What is a disadvantage of ultrasonic testing?

• It cannot be automated

• It requires access to both sides of the part

• It is not sensitive to small flaws

• It can be affected by metal grain size

Answer explanation

Ultrasonic testing can be influenced by the metal grain size, which may affect the accuracy of flaw detection. This makes it less reliable for certain materials, highlighting a significant disadvantage of the method.

Which method is the most commonly employed ultrasonic technique?

• Reflection method

• Through transmission

• Transmit-receive (pulse-echo)

• Pitch and catch

Answer explanation

The transmit-receive (pulse-echo) method is the most commonly used ultrasonic technique because it effectively measures the time it takes for an ultrasonic pulse to travel to a target and back, providing accurate distance and flaw detection.

What is a benefit of digital technology in ultrasonic testing?

• It makes the equipment heavier

• It complicates the calibration process

• It reduces the sensitivity of the equipment

• It allows for more accurate and reliable results

Answer explanation

Digital technology enhances ultrasonic testing by providing advanced data processing capabilities, which leads to more accurate and reliable results compared to traditional methods.