JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II PRODUCTION TECHNOLOGY Previous Question Paper (April - 2018 - R13)
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
Casting is used to produce complex-shaped components that are difficult or expensive to manufacture by machining, such as engine blocks, turbine blades, pump housings, valves, and artistic sculptures.
Draw the complete casting process with neat sketch.
Answer
The casting process involves creating a pattern, preparing a mold using sand, melting the metal, pouring it into the mold cavity, allowing it to solidify, and finally shaking out the casting for cleaning. The process flow is: Pattern making → Mold preparation → Melting → Pouring → Solidification → Shakeout → Fettling.
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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