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Wednesday, 7 January 2015

Non-Destructive Test and Evaluation of Materials-Model question paper for B.E/B.Tech Engineering


1(a) Write a note on the factors influencing the reliability of Non-Destructive Test and Evaluation. (6 Marks)
(b) Write a note on selection of radiation source in radiographic method of NDT. (4 Marks)
(c) Briefly explain the principle involved in X-ray computed tomography. (4 Marks)
(d) What are the three basic means used as protective measures to keep radiation exposure within allowable limits? Explain. (6 Marks)
2(a) Distinguish between Symmetric Lamb waves and Asymmetric Lamb waves. (6 marks)
(b) Define Acoustic Impedance. Mention the parameters on which acoustic impedance is dependant. (4 Marks)
(c) Explain how ultrasonics are generated by piezo electric effect. (6 Marks)
(d) Write a note on variables affecting ultrasonic test. (4 Marks)
3(a) Explain how wrought products are tested by ultrasonic method. (8 Marks)
(b) Write a note on British Calibration Block. (4 Marks)
(c) Explain distance-amplitude curve method for the determination of flaw size. (4 Marks)
(d) Write a note on limitations of ultrasonic testing. (4 Marks)
4(a) A liquid with high surface tension, low contact angle and low viscosity makes a good penetrant liquid. Explain. (6 Marks)
(b) Write a note on pre-cleaning the component surface in the liquid penetrant test process. (4 Marks)
(c) Explain propagative and non-propagative surface defects. (4 Marks)
(d) What are the four types of developers used in liquid penetrant test process. Explain. (6 Marks)
5(a) Explain the various methods involved in magnetic particle test. (8 Marks)
(b) Write a note on the defects and their observed indications during magnetic particle test. (8 Marks)
(c) Write a note on limitations of magnetic particle test.(4 Marks)
6(a) What is magnetic coupling? What are the two types of coupling? (6 Marks)
(b) Write a note on the effect of magnetic permeability on impedance diagram. (6 Marks)
(c) What is the role of encircling coil and surface coil in eddy current test system? (8 Marks)
7(a) Draw and explain a typical Acoustic Emission setup. (6 Marks)
(b) Distinguish between Colorometric  method of tracer gas test and Helium mass spectroscopy. (6 Marks)
(c) What is pulse-echo method? Explain. (4 Marks)
(d) Write a short note on coin tap test. (4 Marks)
8 (a) Explain how NDE is useful in aerospace industries. (6 Marks)
(b) Write a note on probability of defect detection and NDE. (6 Marks)
(c) Write a note on modern trends in NDE. (8 Marks)

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