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MIME 262 - Mid_Fall_07_Solutions

MIME 262 - Mid_Fall_07_Solutions - IN-TERM EXAM#1 Oct 17th...

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IN-TERM EXAM #1, Oct 17 th , 2007 DURATION: 45 mins Version W CLOSED BOOK McGill ID _______________ ____________ Name ______ McGill University Dept. of Mining, Metals and Materials Engineering PROPERTIES OF MATERIALS IN ELECTRICAL ENGINEERING MIME262 IN-TERM EXAM #1 Examiner: Prof. R.R. Chromik Date: Wednesday, October 17 th , 2007 Time: 45 mins Instructions 1. Read the instructions carefully. 2. Put your name and ID# on this page. Put your NAME on pages 2-8. 3. Read each question completely before working on each part, (the parts may be interrelated ). 4. Write your solutions in the space provided below the relevant question . If necessary, you may continue work on the opposite side of the paper for which the question is printed. 5. Any work you wish to be ignored should be clearly indicated as such. 6. Draw any diagrams as large as possible in the space provided. 7. Label all diagrams, axes, curves etc. 8. For concept type questions, the space provided roughly indicates the level of detail expected. 9. Phase diagrams, a periodic table, graphs of erf(z) & erfc(z) and other useful information are attached at the end of this examination book (pages i through iii). All students must have one of the following types of calculators: CASIO fx-115 , CASIO fx-991 , CASIO fx-570ms SHARP EL-520 , or the SHARP EL-546. NON-REGULATION CALCULATORS WILL BE REMOVED AND NO REPLACEMENT CALCULATOR WILL BE PROVIDED. Leave your calculator cover in your book-bag. You may take only your calculator, a ruler, a pen and your student ID to your desk. NO equation sheets. Rulers are subject to inspection. Official USE ONLY P1 P2 P3 P4 P5 Bonus
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1. True/False Section (1 pt each) - Please clearly indicate your answer by circling either true or false. If marks are made on both choices or neither choice, no points will be awarded. i. Metal atoms can only form metallic bonds. TRUE FALSE When bonding with non-metals, metals will use ionic bonds. ii. A phase must be made up of at least two components. TRUE FALSE A pure element is a phase. iii. Vacancy diffusion is the diffusion mechanism for most pure metals. TRUE FALSE In a pure material, “self-diffusion” requires vacancies be present. iv. Hexagonal close-packed (HCP) and face-centered cubic (FCC) structures have the same atomic packing fraction (APF). TRUE FALSE Both are “closest-packed.” v. Transition metals and oxygen always form fully ionic bonds. TRUE FALSE There is a percent ionic character that describes how bonds will range from ionic to covalent. vi. A crystalline plane with a high surface energy would have a correspondingly high planar density.
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