10+ NDT Technician Interview Questions and Answers

The gap between yoke machine legs is the distance between the two legs of the yoke machine.

• The gap is typically adjustable to accommodate different sizes of test objects.

• The size of the gap can affect the sensitivity and performance of the yoke machine.

• For example, a larger gap may be needed for inspecting larger or thicker materials.

• The gap should be set according to the specifications and requirements of the inspection procedure.

There are different types of RT (Radiographic Testing) techniques used in NDT.

• RT techniques include film radiography, computed radiography, and digital radiography.

• Each technique has its own advantages and disadvantages.

• Film radiography is the oldest and most traditional method, while digital radiography is the newest and most advanced.

• Computed radiography is a hybrid of film and digital radiography.

• The choice of technique depends on the specific application and the requireme...read more

Fatigue cracks are small cracks that develop in a material due to repeated cyclic loading or stress.

• Fatigue cracks occur when a material is subjected to repeated loading or stress.

• They typically start at stress concentration points or defects in the material.

• Fatigue cracks can propagate and grow over time, leading to failure of the material.

• They are commonly seen in structures such as bridges, aircraft, and machinery.

• Non-destructive testing (NDT) techniques like ultrasonic te...read more

There are several types of PT materials used in non-destructive testing.

• PT materials include water-washable, solvent-removable, and post-emulsifiable types.

• Water-washable PT materials are commonly used for surface crack detection.

• Solvent-removable PT materials are used for detecting cracks in non-porous materials.

• Post-emulsifiable PT materials are used for detecting fine cracks and are often used in aerospace applications.

MT principal refers to the principles of Magnetic Particle Testing, a non-destructive testing method.

• MT is a non-destructive testing method used to detect surface and slightly subsurface discontinuities in ferromagnetic materials.

• The two principal methods of MT are the dry method and the wet method.

• The dry method involves applying dry magnetic particles to the surface being tested, while the wet method involves suspending the particles in a liquid carrier.

• The principles of MT...read more

There are two types of x-ray files: digital and film.

• The two types of x-ray files are digital and film.

• Digital x-ray files are stored electronically and can be easily shared and manipulated.

• Film x-ray files are physical images that need to be developed and stored manually.

• Digital x-ray files are becoming more common in modern medical facilities.

• Film x-ray files are still used in some older medical facilities or for certain types of imaging.

Undercut in NDT can be found by visually inspecting the weld for a groove or depression along the weld toe.

• Visually inspect the weld for any groove or depression along the weld toe

• Use a magnifying glass or microscope for closer examination

• Perform a dye penetrant test to highlight any undercut

• Ultrasonic testing can also be used to detect undercut

• Consult relevant codes and standards for acceptance criteria

DAC stands for Distance Amplitude Correction, used in ultrasonic testing to correct amplitude variations with distance. BP stands for Backwall Echo Attenuation, used to measure the strength of the backwall echo signal.

• DAC is used in ultrasonic testing to correct amplitude variations with distance

• BP is used to measure the strength of the backwall echo signal

• DAC is essential for accurate flaw detection in ultrasonic testing

• BP helps in determining the quality of the material bei...read more

Index point is a reference point used in NDT to mark the location of a defect or anomaly on a test specimen.

• Index point is typically a small mark or indicator placed near the defect for future reference.

• It helps in accurately locating and tracking defects during the inspection process.

• Index points can be physical markers like stickers or paint dots, or digital markers in software applications.

• For example, in ultrasonic testing, index points are used to mark the location of in...read more

DPT stands for Dye Penetrant Testing, a non-destructive testing method used to detect surface-breaking defects in materials.

• DPT is commonly used in industries such as aerospace, automotive, and manufacturing.

• The process involves applying a liquid dye penetrant to the surface of a material, allowing it to seep into any surface-breaking defects.

• After a developer is applied, the excess penetrant is removed, and any defects will be visible as bright indications against a contrast...read more