MSE FINAL EXAM ANSWERS (2013) (1)

MSE FINAL EXAM ANSWERS (2013) (1) - ‘ r MS&E 210 Final...

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Unformatted text preview: ‘ r MS&E 210 Final Fall 2013 /% life are. 5 0000013“ Pmblamgm WK: mm) ggnel-lm m W ommrfi 3‘01“ ( h 1. You have an oxide that has the rocksalt structure. The radius ofthe oxygen Chi "A 0‘ m ion in 0.140 nm and the radius ofthe cation is 0.0695 nm. Calculate the ( __ 0 Mr.) M! volume of the unit cell in cubic nano-meters. (Your answer should be 0c ' accurate to 4 decimal places.) a. Answer: 0.0736 / I f i ‘ ., 3 2. You have an elemental tetragonal material. The d-spacing ofthe (100) planes N,“ l '? 3.35% in 0.292 nm and of the (001) planes is 0.346 nm. Calculate the volume of the . unit cell in cubic nano-meters. (Your answer should be accurate to 4 decimal places.) _ a. a. Answer: 0.0295 .Ml - 75% l. 3. You have an elemental BCC material with an atomic weight of 50.02. Given the radius ofthe atom in this material is 0.13 nm, calculate the density of the material. a. Answer: 6.139 4. The change in gauge length of a specimen [in the direction of the applied stress) divided by its original length is known as: ~—? a. True strain 6 b. Engineering strain .K; c. True stress d. Not among the other choices 5. In a tensile test during necking is always less than engineering stress. a. Engineering strain b. True stressfi c. True strain F? d. Not among the other choices 6 6 6 6. Ceramic materials are generally bonded. a. Covalently b. Ceramically%€v 6;) C. Ionically 6 d. Not among the other choices 7. MgO forms the rocksalt structure. The oxygen atoms are in a FCC arrangement. There are 4 oxygen atom equivalents per unit cell. How many Mg atom equivalents are there per unit cell? *3 a. 4 6 ? b. 8 c. 6 cl. not among the other choices 8. In a FCC crystal the (111) plane is a plane. ——) a. Close packed 6 6 6 b. Random c. Loosely packed d. Not among the other choices 9. Fick's first law is given by] = -D*(d(phi)/dx)’. I is the material flux. ] can have units of: a. Gms/(sec m"3) b. gms/sec -——fi>c. gms/(sec m"2) 6 6 6 d. not among the other choces 10. The melting point ofTiOZ is (figure 1): 3. Can't tell from the phase diagram b. 1740 degrees C "a c. 1825 degrees C 6 6 6 d. not among the other choices 11. In general strong metals have: a. High ductility b. A low hardness “ex—ED C. A high hardness 6 ?? (1. Not among the other choices 12. "At 1690 degrees C, MgTi205 (figure 1):" a. melts incongruently b. changes crystal structure {9 c. melts congruently 6 6 6 d. not among the other choices 13. The atomic number is: a. The number of electrons around the atom nucleus b. The number of protons and neutrons in the atoms nucleus 6 c. The number of neutrons in an atom nucleus d. Not among the other choices 6 6 6 14. At 1680 MgTi03 [figure 1): mow—jg a. melts incongruently 6 6 6 ' b. changes crystal structure c. melts congruently d. not among the other choices 15. “The crystal system where a = b not = c, and alpha = beta = gamma = 90 degrees is the system." a. Orthorhombic I“? b. Tetragonal 6 6 6 c. Cubic d. Not among the other choices 16. Each electron in an atom has quantum numbers. ’6’) a. 4 6‘ 6 (— b. 3 c. 2 d. not among the other choices 17. One way to strengthen a metal is to: a. Unload the metal b. Anneal the metal . #9 c. Work harden the metal 6 6 6 (1. Not among the other choices 18. Sheet metal is made bya process called: a. Extrusion MS&E 210 Final Fall 2013 b. Forging —-9 c. Rolling 6 6 6 d. Not among the other choices 19. A technique for joining metals in which actual melting of the pieces to be joined occurs in the vicinity of the bond is called: a. Welding 6 6 6 b. Forging c. Deep drawing d. Not among the other choices .K 20. At 1600 degrees c at a sample composition emu mol % Ti02 the phases present are [figure 1): a. MgZTiO4 solid 6 7? b. MgO and Mg2Ti04 c. Mg2TiO4 and liquid fl d. Not among the other choices 21. A composite: a. Is never used in engineering applications b. Is a uniform material 4——§ c. Is composed of several phases 6 6 6 d. Not among the other choices 22. Germanium forms a crystal with a diamond structure. Germanium is not considered a metal. The type of primary bonding that Germanium would exhibit is therefore: a. Van der Waals b. Ionic a c. Covalent 6 6 6 d. Not among the other choices 23. The number of atomic equivalents in a BCC unit cell are: a. 4 Ab. 2666 c. 1 d. not among the other choices 24. Pearlite: ware. Is a two phase structure consisting of Cementite and Ferrite 6 6 6 b. Is a very hard single phase structure c. Is a two phase structure consisting of Austenite and Cementite d. Not among the other choices 25. "Generally, as temperature increases, the diffusion coefficient" :13; a. increases 6 6 6 b. stays the same c. can't tell from the information given d. not among the other choices 26. Chromium (Cr) has an atomic number of 24. The electronic configuration of Cr is: ,2") a.152,252.2P6.332.3P_§:3d53451 <- 6 6 27. The method of making beer cans is: _,. —-—9 a. Deep drawing 6 6 6 b. Forging c. Casting d. Not among the other choices 28. “ No two electrons can have the same 4 quantum numbers is known as the:” a. the electron quantum rule b. the bonding energy principle $0 Pauli exclusion principle 6 6 6 (1. Not among the other choices 29. The invariant point at 1600 degrees C is known as (figure 1): a. A eutectoid fl b. A eutectic 6 6 6 c. A peritectic (1. Not among the other choices 30. "As the percent cold work increases, the:" ———§ a. the yield strength increases 6 6 6 b. the yield stress decreases c. hardness of a metal decreases d. not among the other choices 31. In a crystal the three dimensional array of points coinciding with atom positions are called a: ——=> a. Lattice 6 6 6 b. Unit cell c. 3-D plane d. not among the other choices 32. “Consider a composition containing 20 mol % Ti02 and 80 mol % MgO (figure 1). At 1800 degrees C, the phase(s) present is (are]:” a. liquid plus Ti02 b. solid MgO plus liquid 6 6 6 7? c. Liquid MgO d. Not among the other choices 6 33. The eutectoid composition in the iron carbon system is: a. 0.77 mol % C b. 0.77wt%C666 c. 1.2 mol % Fe d. not among the other choices . 34. Which of the following is not a diffusion mechanism? a. Interstitial b. Viscous flow 6 6 6 c. Vacancy d. Not among the other choices 35. Nickel is FCC with an atomic radius of 0.1246 nm. The distance between atom centers in the [001] direction is: a. 0.2878 nm b. 0.3524 nm 6 not confirmed c. 0.2492 nm M88113 210 Final Fall 2013 d. not among the other choices 36. The phenomenon ofmaterial transport by atomic motion is called: a. Convection ——> b. Diffusion 6 6 6 c. Fatigue d. Not among the other choices 37. Which of the following is a surface defect? a. Grain boundary 6 6 6 b. Screw dislocation c. Substitution d. Not among the other choices 38. The maximum engineering stress in tension that may be sustained without fracture is known as: a. Yield strength b. Plastic strain . c. Ultimate tensile strength 6)<6 fid. Not among the other choices 39. For a composition of40 mol % TiOZ and 60 mol % MgO (figure 1), the phases present at 1700 degrees C are: " a. MgZTiO4 and MgTi03 b. MgTiZOS and liquid c. Mg2TiO4 and liquid (1. Not among the other choices 6 7? “7 40. The MgO TiOZ phase diagram (figure 1) contains __ eutectoid points. . 2 c.‘ T'fid? d. not among the other choices 41. The modulus of resilience is: a. Area decrease during necking fl b. The strain energy per unit volume required to stress a material to the point ofyielding 6 6 6 c. Elastic stress divided by elastic strain d. Not among the other choices 42. A slip system is: a. The plane and direction along which the Burgers vector disappears A b. The plane and direction along which dislocations glide 6 6 6 c. The plane and direction along which dislocations climb d. Not among the other choices 43. "The atomic weight of Pb is 207.2 amu and the atomic weight of Sn is 118.69 amu. lfyou have an alloy containing 20 wt % Sn and 80 wt % Pb, what is the composition in mol %? " a. 12.5 mol % Sn and 87.5 mol % Pb b. cannot make the conversion from the data given firmed c. 30.4 mol % Sn and 69.6 mol % Pb d. not among the other choices 44. P mfessory A-N- vonSneedlemeyer has asked you to determine some m ' - wgfghlftngglfggerties of a new element called Tulonium (Tu) with an atomic Dr- Skaar O-u Zulu. Since you have taken MS&E 210 from the venerable with Dr S’gaariea 113’ agree, and have your technician (who took MS&E 210 (Mamet-er _ 0 5Sun a ten51le test on a standard sample ofTulonium t 11 — . 5001nches, gage length = 2.00000 inches). Your technician e S you that at a load of 22614 N the diameter of the specimen is 0.5046 I ____‘___J_. "_——v inches and hands you the following data: 2. 003 l ‘. 9A1 Tulonium exhibits % fracture. (E) ? The elastic modulus ofTulonium is GPa (B) K . The modulus of resilience is kPa (G) The shear modulus ofTulonium is GPa (N) (if "/E— ‘ 6,11%“! “(IA 6" g- A' 36 D 1 (A0 TrC ‘61“)2 a B. Notin list 7' 7/ 6 c. 110 l E “0 D. 286 C0”"‘* h‘ m (’51 0-1 7 E. Ductile FfimT-Qb“ “7-1.1 G. 224 g .. ESL-yew » (—cowdl n m H. 60 ‘l 3~-'\.\ I. Brittle 0 lm "’4' 27 ‘3 3‘ ct K. 70 L. 90 aw“ 45. In an aligned and continuous glass fiber reinforced nylon 6,6 composite, the fibers are to carry 94% of a load applied in the longitudinal direction. Using the data provided, determine the volume fraction of fibers that will be required. Answer: 393 not confirmed Tensile Strength (MPa) ...
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