JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II PRODUCTION TECHNOLOGY Previous Question Paper (April - 2018 - 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. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
State the application of casting process.
Answer
The casting process has numerous applications across various industries, including:
- Automotive industry: Engine blocks, cylinder heads, manifolds, wheels.
- Aerospace industry: Turbine blades, structural components.
- Heavy machinery: Machine tool bases, pump housings, gears.
- Construction: Manhole covers, grates, decorative elements.
- Consumer goods: Cookware, plumbing fixtures, decorative items.
Draw the complete casting process with neat sketch.
Answer
The casting process involves pouring molten metal into a mold cavity and allowing it to solidify. The complete process includes the following steps:
- Pattern Making: Creating a replica of the desired object, usually slightly larger to account for shrinkage.
- Mold Making: Creating a cavity in a mold material (like sand, metal, or ceramic) that matches the pattern's shape.
- Core Making (if needed): Creating internal cavities or passages within the casting.
- Melting: Heating the metal to its molten state.
- Pouring: Introducing the molten metal into the mold cavity.
- Solidification: Allowing the molten metal to cool and solidify within the mold.
- Shakeout: Removing the solidified casting from the mold.
- Finishing: Cleaning, machining, and surface treatment of the casting.
A neat sketch would depict a flask containing the mold cavity, molten metal being poured from a ladle, and the resulting solidified casting.
Classify the welding processes.
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What are the basic requirements of welding?
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What are the disadvantages of bare wire electrode?
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What are the modes of metal transfer in arc welding?
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What do you mean by neutral section in a rolling process?
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Why is it needed to perform annealing during cold working?
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Differentiate between forward and backward extrusion processes.
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What is hydrostatic extrusion process?
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Part B
Explain the working principle of shell moulding process with neat sketch. Also discuss the advantages, limitations and applications of shell moulding process.
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What are the advantages of true centrifugal casting process? Discuss the influence of average rotational speed upon centrifugal casting.
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Discuss the advantages and limitations of different pattern materials.
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The voltage-length characteristics of a DC arc is given by
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Explain resistance weld cycle with neat sketch.
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Explain the three types of oxy-acetylene flames with neat sketch.
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What is heat affected zone? Explain briefly heat affected zone in thermit welding with neat sketch.
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Write the weld properties, advantages, limitations and applications of friction welding.
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Differentiate between TIG and MIG welding and explain.
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What is the principle of laser welding? Mention the applications, advantages and limitations of the process.
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What is soldering?
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Explain cold work-annealing cycle.
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Calculate the bite angle when rolling plates 15 mm thick using work rolls 400 mm diameter and reducing the thickness by 3 mm.
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A strip with a cross section 150×4.5 mm is being rolled with 20% reduction of area using 450mm diameter rolls. The angle subtended by the deformation zone of the roll center is?
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Explain briefly the theory of rolling.
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What is hot extrusion? Discuss different hot extrusion processes.
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Explain the role of container and die in the analysis of extrusion.
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With the help of neat sketches briefly discuss different forging processes.
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What are the various methods of making seamless pipes? Discuss any two methods in brief.
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