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Engineering MaterialsChoose the correct option: In the Fe-Fe_3C equilibrium diagram, ledeburite is: (i) A mixture of ferrite and austenite (ii) A single-phase austenitic structure (iii) Pure cementite (iv) A eutectic mixture of austenite and cementite20252mEngineering MaterialsChoose the correct option: Which of the following is the hardest? (i) Austenite (ii) Bainite (iii) Pearlite (iv) Martensite20242mEngineering MaterialsChoose the correct option: Which crystal structure has the highest packing factor and 12 slip systems, making metals with this structure highly ductile? (i) Body-centered cubic (BCC) (ii) Face-centered cubic (FCC) (iii) Hexagonal close-packed (HCP) (iv) Simple cubic20252mEngineering MaterialsChoose the correct option: Grey and spheroidal cast irons mainly differ in that the graphite phase is present as: (i) Flakes in grey iron and spheroidal nodules in spheroidal iron (ii) Cementite in grey iron and flakes in spheroidal iron (iii) Spheroidal nodules in grey iron and flakes in spheroidal iron (iv) Cementite in both alloys20252m
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