Fundamentals Of Chemistry Paper
1. Iron has a BCC crystal structure, an atomic radius of 0.124 nm, and an atomic weight of 55.85 g/mol. Compute its theoretical density.
2. Cite the primary differences between elastic, inelastic, and plastic deformation behaviors.
3. Of those metals listed in Table 1, (a) Which will experience the greatest percent reduction in area? Why? (b) Which is the strongest? Why? (c) Which is the stiffest? Why?
Table 1 Yield Tensile Strain Fracture Elastic Strength Strength at Strength Modulus Material (MPa) (MPa) Fracture (MPa) (GPa)
A 310 340 0.23 265 210 B 100 120 0.40 105 150 C 415 550 0.15 500 310 D 700 850 0.14 720 210 E Fractures before yielding 650 350
4. Define resolved shear stress and critical resolved shear stress. …show more content…
List the eight most commonly used non ferrous materials and state their superior properties, composition and applications.
16. Construct the isothermal transformation (TTT) diagram for an iron–carbon alloy of eutectoid composition and then sketch and label time–temperature paths on this diagram to produce the 100% fine pearlite,100% tempered martensite and an alloy with a combination of 50% coarse pearlite, 25% bainite, and 25% martensite.
GROUP - III Marks : 1 x 20 = 20
17. Draw the iron - iron carbide equilibrium diagram and explain the reactions at salient compositions and temperatures of the diagram. Discuss the microstructural evolution of 5 % C under equilibrium conditions.
18. A cylindrical specimen of aluminum having a diameter of 12mm and a gauge length of 50 mm is pulled in tension. Use the load–elongation characteristics in Table 2 Plot the data as engineering stress versus engineering strain and Compute the modulus of elasticity, yield strength at a strain offset of 0.002,tensile strength of this alloy, modulus of resilience and ductility in terms of percent elongation.
Table 2 Load in kN Length in mm
0
2. Cite the primary differences between elastic, inelastic, and plastic deformation behaviors.
3. Of those metals listed in Table 1, (a) Which will experience the greatest percent reduction in area? Why? (b) Which is the strongest? Why? (c) Which is the stiffest? Why?
Table 1 Yield Tensile Strain Fracture Elastic Strength Strength at Strength Modulus Material (MPa) (MPa) Fracture (MPa) (GPa)
A 310 340 0.23 265 210 B 100 120 0.40 105 150 C 415 550 0.15 500 310 D 700 850 0.14 720 210 E Fractures before yielding 650 350
4. Define resolved shear stress and critical resolved shear stress. …show more content…
List the eight most commonly used non ferrous materials and state their superior properties, composition and applications.
16. Construct the isothermal transformation (TTT) diagram for an iron–carbon alloy of eutectoid composition and then sketch and label time–temperature paths on this diagram to produce the 100% fine pearlite,100% tempered martensite and an alloy with a combination of 50% coarse pearlite, 25% bainite, and 25% martensite.
GROUP - III Marks : 1 x 20 = 20
17. Draw the iron - iron carbide equilibrium diagram and explain the reactions at salient compositions and temperatures of the diagram. Discuss the microstructural evolution of 5 % C under equilibrium conditions.
18. A cylindrical specimen of aluminum having a diameter of 12mm and a gauge length of 50 mm is pulled in tension. Use the load–elongation characteristics in Table 2 Plot the data as engineering stress versus engineering strain and Compute the modulus of elasticity, yield strength at a strain offset of 0.002,tensile strength of this alloy, modulus of resilience and ductility in terms of percent elongation.
Table 2 Load in kN Length in mm
0