JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II PRODUCTION TECHNOLOGY Previous Question Paper (May - 2019 - 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
List the advantages and limitation of casting process.
Answer
Advantages: Casting can produce complex internal and external shapes, parts of almost any size, and is suitable for both ferrous and non-ferrous metals. Limitations: It often results in lower dimensional accuracy, poor surface finish compared to machining, and potential internal defects like porosity or blowholes.
What are the functions of patterns?
Answer
Patterns serve to form the mold cavity for the molten metal, define the shape and size of the casting, and establish the locations for cores. They also help in creating the gating system and risers necessary for proper metal flow and solidification.
What is carburizing flame?
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What are the basic types of weld joints? Explain.
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What is soldering and Brazing?
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Explain briefly the fluxes and filler rods used in gas welding.
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What is meant by strain hardening?
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How would you differentiate hot and cold rolling processes?
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How do we make collapsible tubes?
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Write notes on forging hammer.
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Part B
Explain the principle of investment casting process with neat sketch. Also discuss the advantages, limitations and applications of investment casting process.
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Illustrate and describe the process of Die casting.
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Explain different types allowances used in patterns making.
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The voltage-length characteristics of a DC arc is given by V=20+30L, where V is the arc voltage and L is the arc length in cm. Determine open circuit voltage and short circuit current for arc length ranging from 3 to 5 mm and current ranging from 200 to 400 Amp during welding operation.
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Explain the process of forge welding.
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Compare and distinguish spot welding and projection welding.
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Explain the principle of thermit welding with applications, advantages and limitations.
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Write the principle of operation along with application, advantage and limitations of explosive welding process.
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What is magnetic arc blow? Mention the causes and remedies of for magnetic arc blow.
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Write the principle of operation along with application, advantage and limitations of TIG welding process.
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Write a note on control of hot rolling mills.
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A number of cold rolling passes are required in a two high rolling mill to reduce the thickness of a plate from 50mm to 20mm. the roll diameter of 700mm and the coefficient of friction at the roll work interface is 0.1. it is required that the draft in each pass must be the same. Assuming no front and back tensions, determine, the minimum no of passes and the draft in each pass.
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Derive an expression for the force acting on metal during rolling.
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A metal strip is to be rolled from an initial wrought thickness of 3.5mm to a final rolled thickness of 2.5mm in a single pass rolling mill having rolls of 250mm diameter. The strip is 450 mm wide. The average coefficient of friction is 0.08. taking plane strain flow stress of 140 MPa, for the metal and assuming negligible spreading, estimate the roll separating force.
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What are the various equipment used in extrusion of metals? Briefly describe them.
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Write the expression for determining the force required to produce an extrusion and discuss the effect of various parameters on the extruding force.
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Explain different forging methods with neat sketches.
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What are the defects may arise in forging process. Discuss the reasons and remedies for them.
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