JNTU
JNTU B.Tech III FUNDAMENTALS OF ENGINEERING MATERIALS Previous Question Paper (November/December - 2018 - R16)
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.
Part A
Determine the packing factor of HCP structure.
Answer
The Atomic Packing Factor (APF) of the Hexagonal Close-Packed (HCP) structure is 0.74. This is calculated by dividing the volume of atoms in the unit cell (6 atoms × 4/3 πr³) by the total volume of the unit cell (base area × height, where height c = 1.633a).
What is the effect of grain size on the properties of the metals?
Answer
Grain size significantly influences mechanical properties: finer grain size increases both the yield strength and hardness of a metal according to the Hall-Petch relationship. Additionally, finer grains improve toughness and ductility, whereas coarser grains may improve high-temperature creep resistance but generally result in lower room-temperature strength.
Classify the binary phase diagrams.
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What is ternary phase diagrams?
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What are the various allotropic forms of pure iron?
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What is the purpose of tempering in heat treatment process?
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What methods are used to extract grey cast iron?
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State any three unique properties of aluminium.
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What are hybrid composites?
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Differentiate addition and condensation polymerization.
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Unit I
What are the Lattice Parameters and Bravai’s lattices for the different types of crystal systems?
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Explain Hume Rotherys rules to determine the limits of solubility.
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Discuss about Intermediate alloy phases.
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Unit II
What does a phase diagram indicates in an alloy system.
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Explain the cooling curves of pure metals and alloys.
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Explain the binary phase eutectoid transformations with examples.
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Unit III
Explain the Iron Carbon phase diagram and the various reactions involved in it.
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Explain different types of annealing process employed for various purposes.
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Unit IV
Discuss the composition, properties and applications of White cast Iron.
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What are the advantages and limitations of cast iron?
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Discuss the critical and equilibrium regions in Al-Cu phase diagrams.
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Unit V
Discuss about the fibre reinforced composites and its strengths.
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Differentiate the properties of thermoplastic and thermosetting plastics.
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Explain the filament winding process for producing FRPs.
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