JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II Year AIRCRAFT PRODUCTION TECHNOLOGY Previous Question Paper (November/December - 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 is brazing? Where is it employed?
Answer
Brazing is a metal-joining process where two or more metal items are joined together by melting and flowing a filler metal into the joint, with the filler metal having a lower melting point than the adjoining metal. It is employed in aircraft manufacturing for joining tubing, heat exchangers, and complex assemblies where heat-sensitive components must be protected.
Describe gas welding.
Answer
Gas welding, typically oxy-acetylene welding, uses the combustion of fuel gas and oxygen to produce a high-temperature flame. This flame melts the base metals and a filler rod at the joint to create a weld pool. It is highly portable and allows for precise control over the heat input, making it suitable for thin-gauge aircraft sheet metal repairs and small-scale fabrication.
Explain the process of drawing a metallic pipe. What are the precautions to be taken?
Answer
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What is super plastic forming?
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What is abrasive jet machining?
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What is electric discharge machining?
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What equipment is required for riveted joints?
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Explain the role of x-rays in NDT.
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What are the advantages of additive manufacture?
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What are the conditions to be satisfied for selecting additive manufacture as the process for a particular component? State in brief.
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Part B
What is resistance welding? Explain in detail.
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What is investment casting?
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Describe, in detail, the equipment used and the process of sand casting.
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Describe centrifugal casting.
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Compare grinding and milling and the machines used for them.
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Draw a neat sketch of a milling machine and explain two operations that can be carried out using this machine.
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Draw a neat sketch of a lathe and explain two operations that can be carried out using this machine.
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Compare grinding and shaping machines.
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Explain, in detail, electrochemical machining, covering the conditions for which it is selected and the equipment required.
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Compare electron beam and laser beam and their application in manufacturing.
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Distinguish between jigs and fixtures.
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Compare magnetic particle and x-ray tests.
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Compare ultrasonic testing and acoustic holography.
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Compare the tests to identify defects in joints in different parts of an aircraft.
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What are the guidelines for selecting additive manufacture for fabricating a part of an aircraft?
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Is there a place for laser in additive manufacture? Justify your answer.
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