JNTU
JNTU B.Tech III FOUNDRY TECHNOLOGY Previous Question Paper (April - 2018 - R15)
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.
Part A
What are the properties of a moulding sand?
Answer
The essential properties of moulding sand include refractoriness (ability to withstand high temperatures), permeability (ability to allow gases to escape), cohesiveness (strength to hold shape), flowability (ability to pack around the pattern), and collapsibility (ease of removal after cooling).
List out the functions of pattern.
Answer
- To create an accurate mould cavity for the molten metal.
- To facilitate the formation of internal cavities or passages through the use of cores.
- To establish the parting lines and gating systems necessary for the casting process.
Why riser is necessary in casting?
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Discuss the functions of a core.
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What is the significance of permanent mould casting
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Brief about composite casting.
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Discuss about induction melting.
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What is nucleation and grain growth?
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What are the advantages of continuous casting process?
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Brief about the significance of cold setting process.
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Part B
Name various allowances considered during pattern making. Explain the significance of each allowance.
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Explain special additives to moulding sand with their effects on mould or casting.
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List different moulding processes. What is the difference between green and dry sand moulding?
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List common defects found in castings produced by green sand moulding? And explain anyone in detail.
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With the help of neat diagrams, explain the Pressure Die-casting process.
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Explain in brief the salient features of squeeze casting process. What are the advantages and limitations of investment casting process?
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What is meant by directional solidification? How does it differ from progressive solidification?
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Draw a neat sketch of a cupola furnace and indicate various zones and temperatures.
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Explain with the help of neat diagrams the steps involved in V moulding process. What are its advantages and limitations?
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Discuss about no bake sand moulds. What are their advantages and limitations?
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