JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II AIRCRAFT PRODUCTION TECHNOLOGY Previous Question Paper (April/May - 2018 - R16)
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
What do you mean by casting?
Answer
Casting is a manufacturing process in which a liquid material, typically molten metal, is poured into a mold cavity of a desired shape and allowed to solidify. Once solidified, the part is removed from the mold to complete the fabrication process.
Explain in brief the die-casting processes.
Answer
Die-casting is a metal casting process characterized by forcing molten metal under high pressure into a mold cavity (die). It is primarily divided into two types: Hot-chamber die-casting, where the injection mechanism is immersed in the molten metal, suitable for low-melting-point alloys like zinc; and Cold-chamber die-casting, where molten metal is ladled into the injection cylinder manually or automatically, used for higher-melting-point alloys like aluminum.
Explain the five axes of a CNC machine.
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Explain the mechanical drive for the ram of a horizontal shaper.
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What are the characteristics of ultrasonic machining?
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Explain the working principles of plasma arc machining.
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What is NDT?
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Explain the process and usefulness of dye-penetration test.
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What is the advantages of additive manufacturing?
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Describe deposition.
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Part B
What are the parts that are produced by casting in an aircraft? Justify your answer with suitable examples.
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Discuss the characteristics of welding flame, torch position and angle.
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Explain the working principles of resistance welding with suitable diagrams.
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Explain salient parts in the equipment for oxyacetylene gas welding with neat sketches.
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A sheet metal which has already been bent in a cold state offers great resistance to further bending. What is the reason? Explain in detail.
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With the help of suitable diagrams explain about the working principle of lathe and mention all its parts and their functions.
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Explain in brief about the super plastic forming and diffusion bonding.
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What are the factors affecting the cutting speed for a drilling equipment? Explain.
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Discuss whether Electro-Chemical Machining is suitable for machining all types of materials.
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Explain the working principles of Abrasive Jet machining with the help of neat diagrams.
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Discuss the applications of Electrical Discharge Machining.
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Explain laser beam machining.
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Describe bolted joints and their efficiencies.
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Write on three inspection techniques used in aircraft production.
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Explain in brief about the acoustic holography with a suitable example.
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Explain the various types of rivets that are useful in the aircraft industry. Justify your answer considering the loads and atmospheric affects over an aircraft.
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Distinguish between planning and control of mechanical production in the context of additive manufacture.
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Additive manufacture is cost-effective. Justify.
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What is additive manufacturing? Mention one aircraft part that can be fabricated using this process and state the steps involved in the process.
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Can a CNC machine be used for additive manufacturing? Discuss.
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