MATLS 1M03 - WebCT - Assignment 6 - Try 5

MATLS 1M03 - WebCT - Assignment 6 - Try 5 - Learning System...

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View Results Name: SIAMAK KIANI Attempt: 2 / 3 Out of: 20 Started: April 6, 2009 1:54am Finished: April 6, 2009 1:54am Time spent: 0 min. 12 sec. Student finished 479 hr, 59 min., 48 sec. ahead of the 28800 min. time limit. Question 1 (1 point) Why have magnesium alloys replaced engineered plastics with comparable densities in many applications? Student response: Correct Response Student Response Answer Choices a. Magnesium alloys are stiffer. b. Magnesium alloys are more recyclable. c. Magnesium alloys are cheaper to produce. d. All of the above. General feedback: Magnesium alloys have replaced engineered plastics because magnesium alloys are stiffer , more recyclable , and cheaper to produce . For more information, see the section on Nonferrous Alloys in the text. Score: 0 / 1 Question 2 (1 point) True or False? For precipitation hardening, artificial aging is carried out at room temperature whereas natural aging is carried out at an elevated temperature. Student response: Correct Response Student Response Answer Choices a. True b. False General feedback: False . Just the reverse is true: Artificial aging is carried out at an elevated temperature whereas natural aging is carried out at room temperature . For more information, see the section on Precipitation Hardening in the text. Score: 0 / 1 Question 3 (1 point) For parts that are to be used in moderately stressed applications, what percentage of the part's interior should be martensite ? Student response: Correct Response Student Response Answer Choices a. 40% b. 50% c. 60% d. 70% e. 80% f. 90% g. 100% Learning System Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_09/scripts/student/. .. 1 of 6 4/6/2009 1:54 AM
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General feedback: For parts that are to be used in moderately stressed applications, 50% of the part's interior should be martensite (at minimum). For more information, see the section on Heat Treatment of Steels in the text. Score: 0 / 1 Question 4 (1 point) What term is used to describe a geometric isomer that has atoms or atom groups positioned on the same side of two doubly bonded carbons? Student response: Correct Response Student Response Answer Choices a. cis b. isotactic c. atactic d. trans General feedback: For more information, see the section on Molecular Configurations : Geometrical Isomerism in the Polymer Structures chapter of the text. Score:
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This note was uploaded on 02/08/2010 for the course MATLS 1M03 taught by Professor Okon during the Winter '09 term at McMaster University.

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MATLS 1M03 - WebCT - Assignment 6 - Try 5 - Learning System...

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