JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III UNCONVENTIONAL MACHINING PROCESSES Previous Question Paper (February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What are the advantages of non-traditional metal cutting?
Answer
Non-traditional machining allows for the processing of extremely hard, brittle, or difficult-to-machine materials that are impractical for conventional methods. It also enables the creation of complex, intricate geometries and deep, small-diameter holes with high precision and superior surface finish without inducing significant mechanical stresses or thermal damage.
Explain the nature of slurry used in ultrasonic machining.
Answer
The slurry in ultrasonic machining consists of a mixture of abrasive grains (such as boron carbide, silicon carbide, or aluminum oxide) suspended in a liquid carrier, typically water or oil. This mixture acts as the cutting medium, where the abrasive particles are accelerated by the vibrating tool to impact and erode the workpiece material through micro-chipping.
What are the applications of abrasive jet machining?
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Comment about tool design electro chemical machining.
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What is the basic principle of metal removal in electric discharge grinding?
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List out the applications of wire-EDM.
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Comment about the cutting speed in laser beam machining.
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Explain the influence of spot diameter on energy density in electron beam machining.
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List out the limitations of plasma arc machining.
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Explain the applications of chemical machining.
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Part B
Explain the mechanism of metal removal in ultrasonic machining.
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Compare and contrast various non-traditional machining processes.
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Explain the economic considerations of ultrasonic machining.
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Comment about the limitations of modern machining processes.
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Explain the influence of the size, shape and concentration of abrasive particles on rate of metal removal obtained in abrasive jet machining.
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Describe the electro chemical honing process.
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List out the applications and limitations of abrasive water jet machining.
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Explain the principle of working of electro chemical grinding process.
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Explain the applications of electric discharge machining.
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Comment about the surface finish in EDM.
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With the help of line diagram, explain the working of Electric Discharge Grinding.
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Explain the factors to be considered for the selection of tool material in EDM.
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Explain the steps involved the generation of laser beam.
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Discuss the need for vacuum and its influence on electron beam machining.
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Explain the process capabilities of electron beam machining.
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Discuss the thermal features of laser beam machining.
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Explain the non-transferred mode of plasma generation.
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Explain the principle of working of chemical machining.
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With the help of a line diagram, explain the steps involved in the shaped tube electrolyte machining.
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