JNTUH
JNTUH B.Tech IV ENGINEERING MATERIALS 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 is the composition of dual steels?
Answer
Dual-phase steels typically consist of a microstructure of soft ferrite (proeutectoid ferrite) containing islands of hard martensite, usually comprising 10% to 30% of the volume fraction, with low carbon content (0.06% to 0.15%) and manganese (1.0% to 2.0%).
What is the composition of HSS steels?
Answer
High-Speed Steels (HSS) are complex alloys containing high concentrations of tungsten (up to 18%), molybdenum, chromium (approx. 4%), vanadium (1% to 5%), and cobalt, with carbon levels ranging from 0.7% to 1.5% to ensure high hardness and wear resistance.
What are the applications of Fe based super alloys.
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Where are super alloys commonly used?
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What are applications of pyro materials?
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What are the properties of super conducting materials?
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What are the properties of ferritic stainless steels?
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What are the applications of martensitic stainless steels?
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What are the three main types of biomaterials?
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What are biomaterials used for?
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Part B
Explain the composition, properties and applications of TRIP steels.
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Explain the composition, properties and applications of maraging steels.
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Give the classification of super alloys and explain the properties and applications of the same.
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Explain the heat treatment of super alloys in detail.
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Explain the classification of Electrical Engineering Materials in detail.
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Explain the applications and properties of Extrinsic and Intrinsic semiconductors super conducting materials.
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Explain the properties and applications of austenitic stainless steels.
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What are the differences between ferritic and martensitic stainless steels?
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Explain the property requirements for biomaterials.
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Explain the concept of biocompatibility with suitable examples.
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