NDT Technician L2 Interview Questions and Answers

Updated 25 Jan 2025

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Q1. What is NDT? NDT is Non Destructive Testing and one object no destructive to bend, cutting,to find the quality is called NDT method

Ans.

NDT stands for Non Destructive Testing, a method used to evaluate the properties of a material, component, or system without causing damage.

NDT techniques include ultrasonic testing, radiography, magnetic particle testing, and visual inspection.
NDT is commonly used in industries such as aerospace, automotive, construction, and manufacturing.
The goal of NDT is to detect defects or irregularities in materials or structures without causing damage.
NDT helps ensure the safety, rel...read more

Ans.

UT stands for Ultrasonic Testing, a non-destructive testing method that uses high frequency sound waves to detect internal flaws in materials.

UT uses high frequency sound waves to penetrate materials and detect internal flaws
The sound waves are reflected back to a receiver when they encounter a discontinuity or defect
The time taken for the sound waves to return can indicate the size and location of the defect
UT is commonly used in industries such as aerospace, automotive, and...read more

Ans.

RT and UT methods are very effective in finding defects in materials.

Radiographic Testing (RT) is effective in detecting internal defects such as cracks, voids, inclusions, and other discontinuities in materials by using X-rays or gamma rays.
Ultrasonic Testing (UT) is also very accurate in finding defects by sending high-frequency sound waves into the material and analyzing the reflected waves to identify flaws like cracks, voids, and thickness variations.
Both RT and UT metho...read more

Ans.

DAC stands for Distance Amplitude Correction, a technique used in ultrasonic testing to correct amplitude variations caused by distance.

DAC is used in ultrasonic testing to correct amplitude variations caused by distance between the transducer and the reflector.
It involves adjusting the signal amplitude based on the distance traveled by the ultrasonic wave.
DAC helps in ensuring accurate flaw detection and sizing in materials.
Example: In a weld inspection, DAC is used to compe...read more

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Ans.

NDT methods are non-destructive testing techniques used to evaluate the properties of a material, component, or system without causing damage.

Ultrasonic Testing (UT) - uses high-frequency sound waves to detect internal flaws
Magnetic Particle Testing (MT) - uses magnetic fields to detect surface and near-surface flaws
Radiographic Testing (RT) - uses X-rays or gamma rays to inspect the internal structure of a component
Radiographic Testing with Film Interpretation (RTFI) - simil...read more

Ans.

JNTVT stands for Joint Non-Destructive Testing Validation Team.

JNTVT is a team responsible for validating non-destructive testing methods.
They ensure that testing procedures are accurate and reliable.
Examples of non-destructive testing methods include ultrasonic testing, radiographic testing, and magnetic particle testing.

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Ans.

The least count of a vernier caliper is the smallest measurement that can be read on the scale.

The least count is determined by the number of divisions on the main scale and the vernier scale.
It is calculated as the difference between one smallest division on the main scale and one division on the vernier scale.
For example, if the main scale has divisions of 1 mm and the vernier scale has 10 divisions that cover 9 main scale divisions, the least count would be 0.1 mm.