JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II MANUFACTURING PROCESS Previous Question Paper (April - 2018 - R16)
Part A is compulsory. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit.
PART-A
What is the difference between pattern and casting?
Answer
- A pattern is a replica of the object to be cast, used to create the mold cavity in the molding sand. It is a tool used in the preparation of the mold.
- A casting is the final metallic product obtained after molten metal is poured into the mold cavity and allowed to solidify.
What are the advantages of casting process and mention its applications.
Answer
Advantages:
- Capable of producing complex internal and external shapes.
- Suitable for mass production of parts with varying sizes, from a few grams to several tons.
- Economical for materials that are difficult to machine.
- Minimal waste as excess material can be recycled.
Applications:
- Automotive engine blocks, cylinder heads, and transmission cases.
- Industrial machinery components, pump housings, and valves.
- Artistic sculptures and decorative items.
What is the difference between DC and AC arc welding?
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What is filler metal? Explain its importance in welding.
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How is brazing different from welding.
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Explain the heat affected zones in welding.
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Suggest the presses used for coining operations.
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What are the specific merits of cold working over hot working?
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What are the advantages of extrusion process?
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What are the forging defects?
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PART-B
Differentiate between pressurized and unpressurised gating systems with reference to the applications.
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What do you understand by centrifugal casting? How are the centrifugal casting methods classified?
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What purpose is served by the risers in sand casting? Explain the principles of design of risers.
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What are the advantages, limitation and applications of investment casting?
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Describe the oxy-acetylene gas welding technique and give the applications.
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Explain the resistance welding process giving the equipment, parameters controlled and its advantages.
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What are the kinds of joints that are normally employed for welding processes? Give their sketches.
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Explain submerged arc welding process and its applications.
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What are differences between TIG and MIG welding processes?
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Write a short note on laser beam welding, detailing the applications.
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What is friction welding? What are its applications?
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Explain about welding defects and destructive and non destructive testing of welds.
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What are the main characteristics of hot working as compared with cold working process?
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Explain about hot spinning and cold spinning applications.
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Briefly explain various methods available for breakdown passes in rolling. Explain their applications.
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Distinguish between bending and drawing in sheet-metal operations.
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Explain forward extrusion and backward extrusion with neat sketches.
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Differentiate between roll forging and rotary forging.
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Differentiate hot extrusion and cold extrusion processes.
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Sketch and explain forging hammers. What are the advantages of cold forging?
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