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04-BS-11: December 2017

Nivaar worked solution (AI-drafted; not reviewed by a licensed engineer)

  1. Question 1 FeO Rock-Salt Structure, Packing Factor, Density, and Wustite Semiconductivity
  2. Question 2 Activation Energy for Interstitial Diffusion from Two Temperatures
  3. Question 3 Melt Index and Molecular Weight; PTFE Degree of Polymerization
  4. Question 4 Tensile Test of 7075-T5 Aluminum Alloy — Full Property Workup
  5. Question 5 1080 Steel Heat-Treatment True/False; Weld Decay in 304 Stainless Piping
  6. Question 6 Pb–Sn Lever Rule; Coherent Precipitates; Age-Hardening Alloy Selection
  7. Question 7 Solidification Defects; Chvorinov's Rule for a Bronze Casting

Start with Question 1 →

National Exam 04-BS-11, Properties of Materials — December 2017. 3 hours, closed-book examination (approved Casio or Sharp calculator only). Notes on the paper state that any five questions constitute a complete paper and only the first five questions appearing in the answer book are marked, with all questions of equal value. All seven questions are solved below for completeness.

Reference texts: Callister & Rethwisch, Materials Science and Engineering: An Introduction, 9th ed. (crystal structure and defects, diffusion, mechanical behaviour and tensile testing, polymers, phase diagrams and the lever rule, precipitation hardening, corrosion, casting and solidification).