Jawaharlal Nehru Technological University Hyderabad
Jawaharlal Nehru Technological University Hyderabad B.Tech III FABRICATION PROCESSES Previous Question Paper (August/September - 2024 - R16)
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
Define pattern.
Answer
A pattern is a replica of the object to be cast, used to create a cavity in the molding sand. It is the physical model around which the sand is packed to form the mold.
What are the different types of pattern allowances?
Answer
The different types of pattern allowances are:
- Shrinkage or contraction allowance
- Draft or taper allowance
- Machining or finish allowance
- Distortion or camber allowance
- Shake or rapping allowance
What is heat affected zone?
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Explain soldering.
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Define recrystallization temperature.
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Difference between blanking and punching.
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What fluids are used in hydrostatic extrusion?
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What is tube extrusion?
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Write about closed die forging
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What is roll forging and write its applications?
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Part B
Sketch and explain the working of a crucible furnace. Give its applications.
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What are the elements of the Gating System? Explain with sketches.
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Explain about various types of Riser and Riser design.
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Calculate the optimum pouring time for a casting whose mass is 20 kg and has an average section thickness of 15mm. The casting materials are grey cast iron and steel. The fluidity of iron is 28 inches.
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Explain the working principle of (i) spot welding (ii) flash butt welding in detail.
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Briefly describe the Oxy-Acetylene welding technique with a neat sketch.
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Give the advantages and limitations of TIG welding over MIG welding.
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Discuss various destructive and non-destructive methods of testing weld quality.
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Distinguish between cold and hot working.
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A cup of height 10 mm, diameter 5 mm and corner radius 0.2 mm is to be made from sheet metal of 2.5 mm thickness. Find the suitable number of draws.
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List the various operations performed in a sheet-metal shop. Distinguish between bending and drawing.
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Explain the principle of wire drawing with a neat sketch.
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Differentiate between direct extrusion and indirect extrusion.
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Classify extrusion processes. With a neat sketch, explain Hydrostatic extrusion.
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With a neat sketch, explain the impact Extrusion process.
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What are the applications and limitations of the extrusion process?
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Explain in detail the Rotary forging.
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Explain the forces involved in the forging process with a neat sketch.
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Distinguish between the drop and press forging process about the process and products obtained.
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Classify forging defects and give the necessary remedies.
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