JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech II PRODUCTION TECHNOLOGY Previous Question Paper (December - 2017 - 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.
Part A
What materials are used for moulding sand?
Answer
Moulding sand is primarily composed of silica sand (SiO2) grains, a binder (typically bentonite clay), moisture (water) to activate the binder, and additives such as coal dust, wood flour, or dextrin to improve properties like permeability, refractoriness, and collapsibility.
What is pressurized gating ratio?
Answer
A pressurized gating system is one where the total cross-sectional area decreases towards the mould cavity (e.g., Sprue area > Runner area > Ingate area). This restriction creates back pressure, ensuring the gating system remains completely filled with molten metal, which minimizes air aspiration and turbulence.
What is the difference in design of torch tips in gas welding and gas cutting?
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Mild steel can be welded by which flame of oxy acetylene welding and why?
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What are the different ways by which the metal is transferred in gas metal arc welding?
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What are the advantages of laser beam welding?
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What is strain hardening?
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Explain the coining and embossing operations.
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What is fullering operation?
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Differentiate drop and press forging.
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Part B
What are the types of gates used in the casting process?
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What are the advantages of centrifugal casting as compared to other conventional methods of casting?
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How chills and pads help in directional solidification?
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What process is followed in shell moulding process?
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Differentiate DCRP and DCSP.
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What purpose is served by coatings on the electrode during welding operation and what are the coating materials used?
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Explain forge welding operation and its limitations.
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How the heat energy is used in thermit welding process?
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Discuss any one non destructive testing of welds.
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Distinguish soldering and brazing process and also state its applications.
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Explain induction welding operation.
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Explain diffusion welding operation with its applications.
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What are the various roll pass sequences?
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Explain the sequences used in wire and tube drawing operations.
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Differentiate hot and cold spinning.
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Discuss the mechanics used in finding the angle of bite of the rolling operation.
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What are the various stages encountered in drop forging of lever.
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What is impact extrusion?
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Distinguish the forward and backward extrusion process.
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