JNTU
JNTU B.Tech II MANUFACTURING PROCESS Previous Question Paper (December - 2018 - R16)
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 points are to be considered before the selection of casting process for manufacturing a component?
Answer
Key considerations include the required production volume, geometric complexity of the part, material properties (melting point, fluidity), desired surface finish, dimensional accuracy, and the total cost of tooling versus the cost per unit.
What are the advantages of true centrifugal casting process?
Answer
True centrifugal casting produces high-density parts with superior mechanical properties due to the removal of impurities and gases by centrifugal force. It eliminates the need for cores in cylindrical shapes and results in a fine-grained structure with minimal material waste.
Explain various welding positions.
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Explain the effect of polarity on penetration in DC arc welding.
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Why do properties vary widely in most welding heat affected zones?
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Describe the difference between brazing and soldering.
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Explain the effect of microstructure and strain rate on forming.
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Explain the advantages of cold working.
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Explain the role of lubricant in extrusion.
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Write short note on forging die design.
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Part B
What is the significance of shrinkage in the production of castings?
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Calculate the size of a cylindrical riser (Height and diameter equal) necessary to feed a slab casting 45 x 45 x 25 cm with a side riser, casting poured horizontally in to the mould. Use caine’s equation and take constants in caine equation as a = 0.18, b = 0.05 and c = 1.0.
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Why is it important to provide a means of venting gases from the mold cavity?
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Why might directional solidification be desirable in the production of a cast product?
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With the help of a neat sketch of welding torch explain the oxy acetylene process of welding.
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Why is cleaning of metal important for successful resistance welding? Explain.
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What is meant by edge preparation? Show neat sketches of various edge preparations.
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Explain different forge welding techniques.
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Explain the reasons and suggest remedies for the following welding defects: (i) Distortions (ii) Cracks.
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Describe with neat sketches the TIG welding method and give its specific applications.
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With the help of a neat sketch explain induction welding process.
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What is arc blow? What are the measures to be taken to avoid arc blow?
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Explain the changes in structure and properties during cold working, recovery and recrystallization.
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Explain why spring back in bending depends on yield stress, elastic modules, sheet thickness and bend radius.
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A coil of brass, 30m long by 0.7 m wide, is produced after a reduction from 5mm down to 4mm in a single pass on a two high mill under constant load conditions. Determine the horse power developed, energy consumed and percentage of work for different bearings.
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Why are multiple passes usually required in wiredrawing operations? Explain.
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Suggest and explain the method of manufacturing collapsible tubes.
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Explain the various forging operations and list the forging defects.
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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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What principles are normally considered good practice in the design of drop forgings?
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