Exam_1_Practice_Soln_new

Exam_1_Practice_Soln_new - MSE 201 Practice Exam #1 Spring,...

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Unformatted text preview: MSE 201 Practice Exam #1 Spring, 2009 Circle your section: Name (print) Yim ‘EWM Sec. 1 MNV (Yinglin .i "93 0 g Sec. 2 Tu/Th (Irving) 1 have neither given nor received unauthorized aid on this test. X (signature) No notes, books, or information stored in calculator memories may be used. Cheating will be punished severely. All of your work must be written on these pages and turned in. To receive full or partial credit on numerical problems, you must Show your calculations in step—by-step fashion. Units must be shown when applicable and all plots must have labeled axes. Be sure that you read and answer all parts of each question. Multiple choice questions (3 points each): Carefully circle or write only one answer. 1. Very electronegative atoms are most likely to I a. attract extra'clectrons "3 . give up a va ence e ectron c. form metallic bonds d. none of the above 2. Metallic bonding is best described by which of the following statements? a. has high optical reflectivity b. shares electrons between atoms @EEEQBT‘éTfi‘fcfigWsfifimfiatfig ion cores throughout the entimial? . has high ductility ’t‘ ‘ ‘ ’ 3. Two neon atoms (2:10) interact though a. covalent bonding C van dermmjndln ' e. y rogen ondmg (1. None of the above. 4. The notation (123) denotes a. a direction I b. a plane With 1ntercepts x0=l , yo: I 723113—2048; c. a my oi dlrectlons - d. a family of sets of parallel planes 5. The face diagonal of a FCC unit cell is a. equivalent to the lattice flmeter (a0) e ual in len th to the diametmfitfimsj; L} =5“ 2 l IL ON; C. not a close packe direction id 2 {-1 Q _ (:1. none of the above 6. The hexagonal close-packed (HCP) and face-centered cubic (FCC) lattices a. have different atomic packing factors b. have the _same gm sequences of the close—packed planes c. both contain close-pacfifilfifib‘s’“) d. all ofthe a ove 7. Planes in a family of crystallographic planes a. are always close packed b. are always parallel Cc. wafewfe'p'iesifited by {hkli} d. all of the above 8. In which crystal structure is formation of self—interstitials most favorable? F’— ( a. BCC 23 b. FCC c. HCP d. All of the above. 9. The density of self—interstitial defects in FCC metals is b. high c. the same as the density of vacancies d. slightly greater than the density of vacancies 10. An example ofan area defect is: a. screw dislocation b. interstitial impurity c. substitutional impurity 11. The Burgers vector, b, of a screw dislocation is: a. parallel to the dislocation line) b. has magnltude of zero c. perpendicular to the dislocation line d. none of the above 12. What is the composition in atom percent of Al in an alloy containing 58 g of Ag and 75 g of Al? (Atomic weights: AAg = 107.87 g/mol) and AA] = 26.98 g/rnol) a. 16 at % Al . b. 44at%Al ‘ c. 56at%A1 Omir d. 84at%Al 13. (10points) Using the appropriate boxes below: (a) Indicate the positions of the atoms for simple metals (one atom per lattice point) having the face—centered cubic (FCC) and the body—centered cubic (BCC) structures. (b) For each structure, draw a vector indicating one direction along which there are no spaces between atoms, and give the direction indices for that vector on the line below each box. Use the appropriate notation for crystallographic directions. Direction indices: 14. (6 points) Enter on the line below each box the direction indices for the crystallographic direction indicated by the vector. Use the appropriate notation for directions. 7 t . I a u “inf-i laoiv ; 1;" i 1 Id} rr 52' _- ll --‘ "‘1 U a“. |.l ii I s {liar Emulmb I "' it: 2“; X=l/2, YZI, Z=l/3 15. (6 points) Enter on the line below each box the Miller indices for the shaded planes shown. Use the appropriate notation. Owe Vb 1.3.1:" {owl .mercer’r K @i ‘1 Z bargain'S -‘ K 3’— E “'_ 3L 2‘, k. —- 7. 2. ( l Clear QQU‘MS 35— 1.. ,— -\ o 3) ‘Rch-‘roicrls 4 Q- t 16. (6 points) In each box below, draw the direction or plane corresponding to the direction or Miller indices shown. Make sure the vector or plane isinside the box. "Track :7}; drum "‘S'I‘M hot, NOW- 0"‘J'” + are {A ecmln dsrew‘m MAL“ :néex is Ms“??— -t l '1. l 3 [121] (111) (_ 3—) Rampant-ls l 2 . i ‘ i 1 -7: ’3; . T’lw‘e g l t ‘_ ., ‘ ELMO" :l—MWJQJP-r> ‘5 jig 1 L") < l 17. (10 points) Sketch a two—dimensionnl representation of the following defects: Grain Boundfi " Edge Dislocatio f‘ 66 . l8. (8 points) Plotted below is the energy of interaction versus interatomic separation between two atoms of a fictitious element A. Draw appropriate E— and r—axes that intersect at zero energy and zero interatomic separation and clearly label the equilibrium bond length and bond energy. E A 19. (8 points) Fe is a BCC metal at room temperature with a density of 7.87 g/cm3 and atomic mass of 55.85 amu. Using this information calculate the atomic radius. . a 433 , 2,) u own ‘ u m _—- 7.181 :2. New QGMW orbit" “:0”:- G“) Cw“; A: 65.85 03“ = 1 n A 51.11 x) _1_ ‘1 Cs, N t) ' Vt. NA 0 A “$55951 5-" t ’11) A?) a a t 1 M ; 173cm U 73 --—-—'.-" 2‘, Nb; C“a -: NA 1.513.“; QQESxm %; it) 038? mm a”; ‘_ [98 1 1“) CM 1 ‘ Cd‘fl "' Q0 I Lise“ lb m‘lq AM , .. -— (J . r‘ .- 431 (OWN ' tv- 0‘0 ' a H arm hm l M/K/J 20. (10 points) The energy for forming vacancies in Fe is 2.1 eV. At what temperature is the fraction of vacancies to total lattice sites equal to I X 10'7? 93'- . . , _-—“>" QV' Nv_..t— (Q): C“. QZVIOM 1/ = Sugzilo minim“ , 1M0 ~ C12. NJ I c KT N (32¢ ‘ FL! 1, I, Q ("at ' KT , . fi a” (A‘I-C-Jv‘fi m _, Q/chi-Ow‘s _ —____._C"é" A , — ' Q.C2U‘0:1L:K(’WJ » T'- gjouio'b 94”” ) git—r. UHW'K ...
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This note was uploaded on 03/30/2009 for the course MSE 201 taught by Professor Brenner during the Spring '08 term at N.C. State.

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Exam_1_Practice_Soln_new - MSE 201 Practice Exam #1 Spring,...

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