Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III MANUFACTURING PROCESS AND MACHINE TOOLS Previous Question Paper (January/February - 2023 - R18)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
Write about the various applications of casting process.
Answer
Casting is a versatile manufacturing process used to produce complex, near-net-shape components across various industries. Its primary applications include the production of engine blocks, cylinder heads, and transmission cases in the automotive sector, as well as turbine blades, pump housings, and valves in the aerospace and power generation industries. Additionally, it is widely utilized for manufacturing heavy machinery parts like machine tool beds, agricultural equipment components, and decorative items or artistic sculptures requiring intricate detailing.
Describe the advantages and applications of resistance welding.
Answer
Resistance welding is a process where heat is generated by the electrical resistance of the workpieces to the flow of current. Its primary advantages include:
- High production speeds and suitability for automation in mass production environments.
- No requirement for filler metals, fluxes, or shielding gases, which simplifies the process and reduces costs.
- Minimal distortion of the workpiece due to the localized nature of the heat-affected zone.
- Consistent, high-quality joints with excellent mechanical properties.
Common applications include:
- Automotive industry for body-in-white assembly (spot welding).
- Manufacturing of household appliances, such as refrigerators and washing machines.
- Fabrication of metal furniture, wire mesh, and containers.
- Production of structural components in aerospace and sheet metal industries.
Name different types of rolling mills.
Answer
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What is the difference between stretch forming and bending?
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Write the principle of extrusion.
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Write in brief about drop forging.
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How is the size of a planer specified?
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What assumptions were made by Merchant in arriving at his famous Merchant’s theory?
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How is milling machine specified?
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Differentiate between plain cylindrical and universal cylindrical grinding machine.
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Part B
Classify the types of patterns and sketch any three of them.
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Explain why directional solidification is important in casting?
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Briefly explain the working principle of the electron beam welding process and mention their applications.
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Distinguish between TIG and MIG welding.
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Compare the properties of Cold and Hot worked parts.
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What is strain hardening? Explain its mechanism.
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Explain the metal spinning operation with a neat diagram.
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What are the various ways in which presses can be classified? Give the different types of press tools.
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Define the process of extrusion and its characteristics with sketch.
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Explain the forward and backward extrusion process.
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Name different forging operations. Explain about fullering and edging operations.
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With the help of neat sketch, explain the principle of rotary forging.
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Explain briefly the following lathe operations: i) Facing ii) Threading iii) Knurling iv) Forming.
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Differentiate between shaping and planning machines.
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Draw a neat sketch of taper turning by taper turning attachment method.
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Sketch and describe any one quick return mechanism of shaper.
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Explain different types of indexing methods with example.
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Classify milling machines used in industry and give its applications.
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Explain the principle of cylindrical grinding.
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Write the advantages of tool and cutter grinders.
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