JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III UNCONVENTIONAL MACHINING PROCESSES Previous Question Paper (May - 2019 - R16)
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
Classify different unconventional machining processes.
Answer
Unconventional machining processes are classified based on the energy source used for material removal: Mechanical (e.g., USM, AJM, WJM), Electrochemical (e.g., ECM, ECG, ECH), Thermal (e.g., EDM, LBM, EBM, PAM), and Chemical (e.g., CHM, CPM).
What are the applications of ultrasonic machining and write its limitations?
Answer
Applications: Machining of hard, brittle, and non-conductive materials like ceramics, glass, and semi-conductors; drilling holes in brittle materials. Limitations: Low material removal rate, high tool wear, and limited depth of hole.
Write the advantages and disadvantages of electro chemical honing.
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Write about the Economic aspects of electro chemical machining.
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Discuss about the mechanics of metal removal in electric discharge machining.
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What do you mean by spark erosion?
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Enumerate different process parameters in electron beam machining.
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How do you estimate the material removal in laser beam machining process?
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Write the applications and advantages of electro stream drilling.
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Write a short note on magnetic abrasive finishing.
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Part B
Explain in detail the electrical and physical parameters in the selection of a non traditional method.
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With the help of a neat diagram explain the equipment and principle of ultrasonic machining.
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Develop a mathematical model relating MRR with ultrasonic machining process variables.
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Explain in detail the variation in MRR with different process parameters.
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Explain the influence of process parameters of AJM on metal removal rate?
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Explain the mechanism of metal removal in electro chemical grinding.
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With the help of line diagrams explain the basic principle, equipment, applications and limitations of electro chemical machining.
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Explain in detail the equipment and principle of material removal in electro chemical honing process.
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With the help of a neat sketch explain the working of electric discharge grinding.
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Draw the basic electrical waveform in EDM used in EDM process.
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Explain in detail mechanics of material removal in Wire EDM process.
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Compare and contrast between Electric discharge machining and electric discharge grinding process.
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Explain in detail about the process capabilities of laser beam machining.
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Explain the thermal characteristics of laser beam and write its limitations.
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Explain in detail the construction and working of Electron beam machining.
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Explain in detail the effect of process parameters on surface finish and material removal rate in laser beam machining.
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Explain in detail the application of plasma in manufacturing industries.
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Explain the working principle of abrasive flow finishing process.
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Explain the construction and working of electro chemical machining process and state its limitations.
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Derive a equation for metal removal rate in electro chemical machining.
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