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Engineering MaterialsChoose the correct option: In a standard tensile test on a ductile metal, Young's modulus is obtained from: (i) The entire stress-strain curve up to fracture (ii) The slope of the initial linear portion of the engineering stress-strain curve (iii) The maximum load divided by original area (iv) The slope of the plastic region of the true stress-strain curve20252mEngineering MaterialsChoose the correct option: Which statement about hardness testing is most appropriate for steels? (i) Rockwell hardness directly gives Young's modulus (ii) Brinell hardness can be empirically related to ultimate tensile strength (iii) Vickers hardness is expressed in HRC units (iv) Hardness tests are unrelated to strength20252mEngineering MaterialsChoose the correct option: Which of the following is the hardest? (i) Austenite (ii) Bainite (iii) Pearlite (iv) Martensite20242mEngineering MaterialsChoose the correct option: Which factor most strongly governs whether a substitutional solid solution forms between metals A and B? (i) Large electronegativity difference between A and B (ii) Similar atomic radii and crystal structures with high mutual solubility (iii) Presence of small interstitial atoms like C or N (iv) High melting point of the solvent metal alone20252m
PreviousChoose the correct option: The BCC structure of Fe-C solid solution is known as (i) Ferrite (ii) Pearlite (iii) Cementite (iv) AusteniteNextChoose the correct option: A solid phase results in a solid plus another solid phase on cooling during (i) Eutectoid reaction (ii) Eutectic reaction (iii) Peritectoid reaction (iv) Peritectic reaction
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