JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III Year FABRICATION PROCESSES Previous Question Paper (May - 2019 - R16)
Part A is compulsory. Answer any one full question from each unit of Part B.
Part A
What is the role of clay in moulding sand?
Answer
Why is it important to provide a means of venting gases from the mold cavity?
Answer
Explain the principle of arc welding.
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Why do most welding failures occur in HAZ? Explain.
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What is the effect of strain rate on the formed components?
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What is spring back? Why is it a concern during bending?
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What are the specific applications of cold extrusion?
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Distinguish between forward extrusion and backward extrusion.
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How does roll forging differ from a conventional rolling operation?
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What role is played by temperature in forging operation?
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Unit I
Describe some special types of patterns and indicate the production circumstances in which each would be used.
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Write the advantages, limitations and product applications of investment casting methods.
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Calculate the size of a cylindrical riser (Height and diameter equal) necessary to feed a slab casting 20 × 20 × 5 cm with a side riser, casting poured horizontally into the mould. Use Caine’s equation and take constants in Caine equation as a = 0.15, b = 0.04 and c = 1.0.
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What are the principal precautions to be observed in pouring moulds?
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Unit II
Explain the process of thermit welding and discuss its advantages.
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Classify different regions of Oxy-acetylene flame and with the help of neat sketches explain their characteristics?
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What is the basic principle of explosive welding? Explain.
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What is meant by weld quality? Discuss the factors that influence it.
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Unit III
Explain the changes in structure and properties during cold working, recovery and recrystallization.
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Sketch and explain wire drawing process.
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How do you estimate cutting forces in blanking and piercing?
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What are some of the attractive manufacturing and metallurgical features of hot working process?
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Unit IV
Derive an equation for ideal extrusion pressure.
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Write a note on impact extrusion and list the advantages of impact extrusion over other extrusion processes.
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Explain the effect of extrusion variables on extrusion pressure.
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Explain the process of hydrostatic extrusion.
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Unit V
What are the advantages and limitations of smith forging?
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What are the various forging defects? Discuss briefly.
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Do you think it is possible to forge all the materials? Justify.
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What principles are normally considered good practice in the design of drop forgings?
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