Part A - Answer the following questions: 1. When composites are used instead of metallic structures in AE, the main goal is most often to: a. Improve ductility b. Reduce weight c. Produce cheaper parts 2. Composites are in general: a. Both homogeneous and isotropic b. Isotropic but not homogeneous c. Neither homogeneous nor isotropic 3. Which of the following is not true about particle-reinforced composites: a. Particles are generally ductile and compliant while matrix materials are stiff and hard. b. The rule-of-mixtures equations predict that the elastic modulus should fall between upper and lower bounds c. Particulate composites usually provide greater stiffening and strengthening effect 4. How are continuous fibers typically oriented in fibrous composites: a. Aligned b. Partially oriented c. Randomly oriented 5. Which of the following is not true about the functions of the matrix phase: a. It adds much strength and stiffness to composites b. It firmly holds the fibers together and transmits the applied load c. It protects the individual fibers from surface damage d. It prevents the propagation of cracks from fiber to fiber 6. Below explains which type of polymer composites: This fiber reinforced polymer (FRP) does not have the best mechanical properties compared to other FRPs, however, is widely utilized in various engineering fields thanks to its low price and manufacturing simplicity. a. GFRP b. High modulus CFRP c. Aramid fiber-reinforced polymer composites d. Standard modulus CFRP 7. Which of the following has the highest degree of anisotropy (directional properties): a. [0/0] Unidirectional laminate b. [0/90] Cross-ply laminate c. [45] Angle-ply laminate