Mat Sel Final exam 05

Mat Sel Final exam 05 - 530.352 MATERIALS SELECTION...

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530.352 MATERIALS SELECTION FALL SEMESTER December 19, 2005 PROF. K.J. HEMKER 2005 FINAL EXAMINATION (Closed book - closed notes - open mind) Ethics statement: Johns Hopkins University believes strongly that every member of its community should hold the highest standard of integrity for their work and avoid academic dishonesty. As a Hopkins student you must take this test without receiving assistance from anyone else and without the help of any document (no notes, no books, no looking at your neighbor’s exam) . By signing below you are certifying that this test represents your own knowledge of this subject and that you did not receive assistance from another person or other documents. Name: _______________________________ _______________________________ (print) (sign) 1. These multiple choice questions are intended to demonstrate the broad understanding that you have about material properties and from where they come. Circle the choices that make these statements true. (1 pts ea. / 20 pts total) a) Generally speaking, which class of materials: is easy to form and finish, is relatively stiff, has moderately good strength that can be tailored, corrodes easily, is susceptible to fatigue, but has very good fracture toughness? [metals | polymers | ceramics | composites | naturals] b) Generally speaking, which class of materials: is light weight, cheap and easy to form, is compliant, is brittle at low temperatures, creeps readily at high temperatures but has reasonable room temperature strength and very good corrosion resistance? [metals | polymers | ceramics | composites | naturals] c) Generally speaking, which class of materials: is stiff and light weight, has good room temperature strength and fracture toughness, but is often limited by its high temperature strengths and cost? [metals | polymers | ceramics | composites | naturals] d) Generally speaking, which class of materials: is stiff and light weight, has good compressive strength but low fracture toughness, requires special processing and is hard to machine? [metals | polymers | ceramics | composites | naturals] e) Heat treating metals and alloy to increase their grain size will [increase | decrease | not affect] the high temperature creep strength of the alloy. f) Heat treating metals and alloy to increase their grain size will [increase | decrease | not affect] the room temperature yield strength of the alloy. g) Which is the most densely packed crystal structure [simple cubic | bcc | fcc]? (1 of 11)
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530.352 MATERIALS SELECTION FALL SEMESTER December 19, 2005 PROF. K.J. HEMKER h) The elastic properties of most materials come from [inter-atomic bonding | surface energy | forces between individual crystals (grains) | nanostructures | heat-treating]. i)
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This note was uploaded on 04/08/2008 for the course MECHENG 352 taught by Professor Hemker during the Spring '08 term at Johns Hopkins.

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Mat Sel Final exam 05 - 530.352 MATERIALS SELECTION...

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