Non-Destructive Testing Quiz

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

• To detect flaws without causing damage

• To induce defects for testing

• To replace defective parts

• To dismantle aircraft components

Answer explanation

The main purpose of non-destructive testing (NDT) in aircraft is to detect flaws without causing damage. This ensures the safety and integrity of the aircraft while allowing for thorough inspections.

Which organisation 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)

Answer explanation

The Civil Aviation Safety Authority (CASA) is the Australian government agency responsible for regulating civil aviation safety. The other organizations listed operate in different regions or sectors.

Which of the following is NOT a method of non-destructive testing?

• Visual inspection

• Magnetic particle testing

• Ultrasonic testing

• Destructive testing

Answer explanation

Destructive testing is NOT a method of non-destructive testing, as it involves altering or damaging the material being tested. In contrast, visual inspection, magnetic particle testing, and ultrasonic testing are all non-destructive methods.

What is a limitation of non-destructive testing?

• Results must often be interpreted by a skilled technician

• It cannot be repeated on the same item

• It is always inexpensive

• It requires dismantling of all components

Answer explanation

A key limitation of non-destructive testing is that the results often require interpretation by a skilled technician, as the data can be complex and subjective, making expertise essential for accurate assessments.

What is the principle behind magnetic particle testing?

• Using radiation to create images

• Using sound waves to detect flaws

• Using magnetic fields to detect surface cracks

• 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.

Which method of ultrasonic testing uses one probe for both transmitting and receiving?

• Reflection method

• Transmit-receive (pulse-echo)

• Pitch and catch

• Through transmission

Answer explanation

The transmit-receive (pulse-echo) method uses a single probe to send and receive ultrasonic waves, making it efficient for detecting flaws by measuring the time it takes for echoes to return.

What is a disadvantage of ultrasonic testing?

• It can be affected by metal grain size

• It cannot detect subsurface flaws

• It requires access to both sides of the part

• It is not portable

Answer explanation

Ultrasonic testing can be influenced by the metal grain size, which may affect the accuracy of the results. This makes it a disadvantage compared to other methods that are less sensitive to material properties.

What is the purpose of the 'developer' in dye penetrant testing?

• To harden the surface

• To clean the surface

• To remove excess dye

• To draw out and reveal penetrant in flaws

Answer explanation

The purpose of the 'developer' in dye penetrant testing is to draw out and reveal penetrant trapped in flaws, making them visible for inspection. This is crucial for identifying defects in materials.

Which type of radiation is used in radiographic inspection?

• Ultraviolet rays

• Microwaves

• X-rays and gamma rays

• Infrared 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 non-destructive testing.

What is an advantage of digital technology in ultrasonic testing?

• It makes the equipment heavier

• It reduces the accuracy of results

• It enables digital data storage and retrieval

• It increases the noise in the results

Answer explanation

An advantage of digital technology in ultrasonic testing is that it enables digital data storage and retrieval, allowing for easier access and management of test results compared to traditional methods.