JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III POWDER METALLURGY Previous Question Paper (January/February - 2023 - R18)
Note: Part A is compulsory (25 Marks). In Part B, answer any one question from each unit (50 Marks).
PART - A
What is meant by powder metallurgy?
Answer
Powder metallurgy is a metal processing technology that involves producing metal powders and consolidating them into finished or semi-finished shapes by compaction and subsequent sintering at temperatures below the melting point of the major constituent.
Describe the atomizing method.
Answer
Atomization involves the disintegration of a molten metal stream into fine droplets by the impact of a high-velocity fluid, typically water, inert gas, or compressed air. The molten metal is poured through a nozzle, and the high-pressure jet breaks the stream into particles that solidify rapidly as they fall into a collection chamber, resulting in spherical or irregular powder shapes depending on the cooling rate and fluid type.
How do you measure the apparent and Tap densities?
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How do you measure the size distribution of the powder particles?
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In which case the die compaction is used?
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What is theory of consolidation?
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Classify the sintering process used in powder metallurgy.
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What is the uses of sintering?
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Name the industrial applications of powder metallurgy products.
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Explain the applications dispersion sintered materials.
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PART - B
Explain the four different methods of powder production. List out the advantages and limitations of each one of them.
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Compare the powder metallurgy process with other manufacturing Process.
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With the help of a neat sketch, explain the Carbonyl decomposition process.
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Explain the importance of particle slope and size in powder metallurgy.
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Explain the method of powder conditioning.
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Explain any two powder characterization methods.
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Illustrate the compressibility and green strength of powders.
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Explain the following process with a suitable application:
Die compaction
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Isostatic pressing.
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Explain the method of electrophoretic deposition.
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Explain the procedure for powder roll compaction.
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Explain about sintering furnaces, the atmospheres and the various factors to be considered in their selection.
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Explain the activated solid state sintering and its limitations.
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Explain the factors affecting on sintering process.
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Explain the testing and quality control procedures of powder metallurgy parts.
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What are the applications of powder metallurgy?
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How do you manufacture the following powder metallurgy components?
Electric materials
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Magnetic materials.
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