JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV NON DESTRUCTIVE TESTING Previous Question Paper (May/June - 2019 - R15)
Note: This question paper contains two parts A and B. Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
PART A
What is Metallography?
Answer
Metallography is the study of the physical structure and components of metals and alloys by examining their microstructure using optical or electron microscopy. It involves preparing specimens through sectioning, grinding, polishing, and etching to reveal features like grain size, phase distribution, and inclusions.
What is the principle of Acoustic emission method.
Answer
The principle of acoustic emission is the detection of transient elastic waves generated by the rapid release of energy from localized sources within a material, such as crack growth, plastic deformation, or phase transformation, when subjected to external stress.
What are the Liquid penetrant materials used? List them.
Answer
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What are the advantages and limitations of Magnetic Method of NDT.
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Name two Radiographic methods.
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What are the advantages of Radiography?
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How Ultrasonic waves are generated?
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What are the general characteristics of Ultrasonic waves?
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What is Hysteresis – loop test?
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What is the principle of potential drop method?
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PART B
What are various visual methods used in NDT? Briefly explain.
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What are different optical aids used in visual inspection? Explain.
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Explain (i) Leak detection (ii) Thermal inspection methods.
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Explain optical holographic methods.
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Explain Fluorescent Penetration NDT examination method
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Explain briefly how the measurement of metallic properties done by magnetic method.
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Explain limitations and applications of Liquid penetration test
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Explain Magnetic method of Non Destructive testing.
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State and explain the principle of Radiographic test?
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What are the safety aspects of Radiographic test?
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Write short note on (i) x-rays sources (ii) gamma – rays sources.
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Briefly discuss various radiographic inspection techniques
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Explain pulse echo method of ultrasonic testing.
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Discuss briefly about methods and instruments for ultrasonic materials testing.
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Explain Ultrasonic testing for roughness of the surfaces.
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Explain any one transducer in ultrasonic testing with neat sketch.
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What are the steps followed in Electro Magnetic testing?
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Explain about eddy current method.
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Explain Advantages, disadvantages and applications of Electromagnetic testing.
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What are the applications of Electrical Methods?
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