Non Destructive Testing — Winter 2021

Differentiate NDT and DT methods.

List advantages and limitations of DPT.

List most commonly used NDT methods. State advantages and limitations of NDT.

Why and how demagnetization is carried out?

What is Visual examination? Explain principle of light intensity measurements.

Explain the principle of MPT & its limitations.

Discuss briefly about selection procedure of different NDT techniques for detection of defects.

List out advantage and disadvantages of visual testing.

With neat sketch discuss dye penetrant testing.

On which principle leak and pressure test works? List out various methods for that. Explain any one method for leak and pressure test.

What is leak and its different types?

What is coplant in UT? What is its role? State its advantages and disadvantages.

Which method is best for In situ inspection in pipe line of refinery? Why?

Explain B-scan and C- scan CRT display in UT.

Compare and contrast pulse echo and through transmission technique with reference to UT.

“Eddy current testing is a versatile non destructive testing technique.” Explain the statement critically.

Compare Properties of X-rays and gamma rays.

Explain the Snell’s law. By using Snell’s law find refracted angle. Where incident angle of 35° of medium water to steel. Given V =1830 m/s, V = 5850 m/s, L(water) L(Steel) Vs(steel) = 3250 m/s.

Discuss about ultrasonic transducers (probes).

Explain the terms attenuation, beam spread and acoustic impedance in UT.

Briefly suggest various ultrasonic inspection techniques.

Write a short note on Eddy current testing.1

State safety precaution in Industrial radiography.

Explain basic principle of Radiographic examination.

Explain principle and techniques of Acoustic Emission Testing.