Fina Exam of AER463 Student's Name: 22. Which conditions are typically represented in a phase diagram? a) Pressure, volume, and atomic weight b) Temperature and time c) Temperature, pressure, or chemical composition d) Pressure and volume 23. What type of failure can result from Improper maintenance or repair? a) Cavitation b) Chemical attack c) Welding d) Stress corrosion 24. What causes disintegration at elevated temperatures? a) Sonic vibrations b) Thermal shock c) Attack by liquid metals or platings d) Severe vibration 25. Which option is the most common cause of failure in aircraft parts? a) Stress corrosion b) Fatigue c) High-temperature oxidation d) Overload 26. Which of the following is NOT explicitly mentioned as a step in failure analysis? b) Visual examination a) Description of the failure situation d) Chemical design analysis c) Testing for radiation damage 27. Metallographic sections are typically taken through which areas? b) Fracture surfaces and other locations a) Contaminated regions only d) Areas with the most corrosion c) Clean and polished surfaces 28. Which process is commonly abbreviated as SCC? b) Stress Corrosion Cracking a) Stress Concentration Cracking d) Stress Carbonation Cracking c) Stress Controlled Creep 29. How does absorbed hydrogen affect metals? a) It strengthens the grain structure. b) It increases the stress required for crack initiation. c) It lowers the stress required for cracks to initiate and propagate. d) It reduces thermal conductivity. 30. Where does hydrogen diffuse to in carbon steel alloys over time? b) The metal grain boundaries d) The outer oxide layer a) The metal surface c) The metal core Student ID: Fall 2024-2025 Time: 30 min