JNTU
JNTU B.Tech III FOUNDRY TECHNOLOGY Previous Question Paper (May - 2019 - R15)
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 are the differences between pattern and casting?
Answer
A pattern is a replica of the object to be cast, used to create the mould cavity. A casting is the final metal product obtained after pouring molten metal into the mould cavity and allowing it to solidify.
What are common defects found in castings produced by green sand moulding?
Answer
Common defects in green sand moulding include blowholes (gas entrapment), sand inclusions (loose sand particles), and scabs (surface projections caused by uneven expansion of the sand mould).
What is the importance of shell moulding?
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Discuss various defects that arise due to moulding.
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What is the significance of vaccum die casting?
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Brief about gravity die casting.
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What is dendritic freezing?
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Discuss various stages in solidification.
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What are the salient features of V form full mould process.
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Discuss about no bake sand moulds.
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Part B
With neat sketches, explain three types of patterns and applications of the same. What are the different pattern allowances?
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Give a list of pattern making materials? What factors would you consider for selecting material for pattern making? Explain with example.
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Why core is required? What is core print? List types of core boxes and explain any one.
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Why proper gating system is necessary for defect free casting? Explain different types of gating systems briefly.
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Explain in brief the salient features of investment casting process. What are the advantages and limitations of investment casting process?
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Discuss the variables of centrifugal casting process. What are the advantages and limitations of the process?
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Explain different methods to be adopted for promoting directional solidification.
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Give a list of furnaces used in a foundry for melting purpose.
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Compare Induction furnace with Cupola furnace.
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With the help of neat sketches, explain the continuous casting process.
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Discuss the significance of Cold Setting and Self Setting Processes in casting industry.
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