JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech IV SURFACE ENGINEERING Previous Question Paper (January/February - 2023 - R18)
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
What are the properties of surface?
Answer
Surface properties include physical characteristics like roughness and texture, chemical properties such as corrosion resistance and chemical reactivity, and mechanical properties including hardness, wear resistance, and fatigue strength.
Why surface treatment is required?
Answer
Surface treatment is required to improve the performance and service life of components by enhancing wear resistance, corrosion resistance, fatigue strength, and aesthetic appeal, or to modify surface properties like electrical conductivity and friction coefficients without altering the bulk material properties.
Give the classification of coatings.
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Differentiate between electroplating and electroless plating.
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What is the purpose of nitriding?
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What is the difference between carbonitriding and nitrocarburizing?
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What do you mean by tempering?
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Give the limitations of laser cladding.
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How design principles play important role in surface engineering?
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Why surface preparation is required?
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Part B
Discuss the evolution of surface modification techniques in recent past.
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Explain why surface modification is needed?
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Explain how the chemical properties of surface can be changed?
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How the surface coatings greatly influence on the properties of the material?
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Explain the principle of electrodeposition with the help of a diagram.
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State the different PVD processes and discuss the sputter coating technique.
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Describe chemical vapor deposition process with neat diagram.
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Briefly explain about electroless deposition process.
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Explain carbonitriding? What are its applications?
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Describe the principle, advantages and applications of thermal spraying.
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Describe the solid carburizing method with suitable example.
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Give the advantages and disadvantages of plasma nitriding.
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Explain the process of low temperature tempering.
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Distinguish between laser cladding and laser alloying.
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Discuss the advantages and limitations of electro beam hardening.
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Explain the effect of various process parameters in laser surface alloying.
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Explain surface engineering solution to a specific problem by taking one example.
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Mention different design guidelines for surface preparation.
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