Final.201.Spring.07

Final.201.Spring.07 - PRINTED NAME:

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Unformatted text preview: PRINTED NAME: ______________________________________________________ SIGNATURE: ___________________________________________________________ Materials Science 201 Final Exam Prof. Wolverton Spring 2007 KEEP THIS CLOSED UNTIL YOU ARE ASKED TO BEGIN You are permitted to use your own calculator as well as 2 two-sided sheets of notes . The exam is closed book . A periodic table, some characteristics of elements (inside cover of Callister), and some physical constants are given at end of exam. Two blank pages are given at end of exam (if you use these pages, please clearly mark the problem number to which your work refers). 100 total points possible Part 1. [16 pts] Multiple choice Mark one or more correct answers to the following questions: a. ( 2 pt ) For an edge dislocation the Burgers vector is parallel to the dislocation line perpendicular to the dislocation line at any angle between 0 and 90 o with the dislocation line b. ( 2 pt ) Fatigue resistance of a steel gear can be increased by: shot peening scratching carburization c. ( 2 pt ) Which of the following are point defects: dislocations cracks solute atoms d. ( 2 pt ) Which type of material has the largest band gaps? metals insulators semiconductors e. ( 2 pt ) K Ic is a measure of Resistance to fracture Resistance to creep Resistance to fatigue f. ( 2 pt ) Tensile strength of polymers can be increased by Decreasing molecular weight Increasing crystallinity Pre-deformation by drawing g. ( 2 pt ) Packing fraction is highest in one of the following structures: BCC diamond HCP h. ( 2 pt ) Which material class is most frequently recycled today?...
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Final.201.Spring.07 - PRINTED NAME:

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