-English version- PART B 03 (a) Figures 4 (a) and (b) show the optical photomicrographs of various cast irong, i. ii. Name the cast irons types shown in Figures 4 (a) and (b). (2 marks) Differentiate the composition and mechanical characteristics for both cast irons in Figure 4 (a) and (b). (6 marks) Compare the process to produce cast irons in Figures 4 (a) and (b). (3 marks) Justify why the cast iron in Figure 4 (b) is more ductile than gray cast irons. ) (4 marks) iii. iv. Figure 4. Optical photomicrographs of various cast irons A transparent skywalk structure in Figure 6 (a) is to be built at an elevation of 250 meters above ground using borosilicate glass. By referring to Figure 6(b), i. State the suitable temperature range for making skywalk glass panels and justify the answer. (3 marks) ii. Discuss the process to strengthen the glass panels using Figure 6(b). (3 marks) Briefly discuss the consequence if the process in (ii) is not performed on the glass. (2 marks) iv. State THREE (3) reasons why glass would be the best material for the transparent floor panels? (3 marks) Tepes 1600 2000 2400 2900 400 200 L200 1200 10 10 Borsican 35% is used als Tolo! 104 10 1012 Tom 15 10 Sono Vasty o 10 10 IG 10 Melting 10 1 Soda 470 600 500 1000 1200 1500 1500 1500 Tercero