Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech IV POWDER METALLURGY Previous Question Paper (December - 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.
PART - A
What is the scope of Powder Metallurgy?
Answer
The scope of powder metallurgy encompasses the production of complex, high-precision components from metallic or ceramic powders, particularly for materials with high melting points, refractory metals, and alloys that are difficult to process via conventional casting or machining.
Compare Powder Metallurgy with other fabrication techniques.
Answer
Unlike casting, powder metallurgy allows for the production of parts with controlled porosity, near-net shape accuracy, and minimal material waste. Compared to machining, it enables the fabrication of complex geometries from materials that are too hard or brittle to machine effectively, often at higher production rates for large volumes.
What is atomization?
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What are the factors affecting mechanical alloying process for powder production.
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What are the commonly used lubricants in die compaction?
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What is the principle involved in Continuous compaction of powders.
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What do you mean by metallic filters?
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What considerations influence the life of sintered bearing?
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Write a brief note on SmCo5 permanent magnets.
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What is the importance of cemented carbide tools?
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PART - B
Explain about particle size, shape and size distribution and its effect on the properties of the final sintered compact.
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Explain the process of powder metallurgy and enumerate the advantages, limitations and applications of powder metallurgy.
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Explain in detail how powders are produced by mechanical methods? Why critical speed is maintained in ball mill?
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Discuss briefly the production of iron powders by reduction process.
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Explain in detail the sintering operation including the stages of sintering.
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Discuss in detail about hot isostatic pressing. How they are advantageous?
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Explain the method of production of electrical contact materials by powder metallurgy. Mention their applications.
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Discuss in detail the technology of production of S. A. P and their properties and uses.
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Discuss various applications of soft magnets.
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Explain the method of production of Fe-Ni soft magnets.
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Discuss various applications of heavy alloys.
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Explain the method of production of heavy alloys.
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