1M03 2009 ASSIGNMENT 6-1 ¿¯

1M03 2009 ASSIGNMENT 6-1 ¿¯ - View

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View Results Name: SOO NAM Attempt: 1 / 3 Out of: 20 Started: April 3, 2009 5:37pm Finished: April 4, 2009 8:43pm Time spent: 27 hr, 5 min., 54 sec. Student finished 452 hr, 54 min., 6 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: 1 / 1 Question 2 (1 point) For parts that are to be used in moderately stressed applications, what percentage of the part's interior should be marten Student response: Correct Response Student Response Answer Choices a. 40% b. 50% c. 60% d. 70% e. 80% f. 90% g. 100% 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: 1 / 1 Question 3 (1 point) The smaller the surface area to mass ratio of a specimen. . . Student response: Correct Response Student Response Answer Choices a. ... the slower the cooling rate and shallower the hardening effect. b. ... the slower the cooling rate and deeper the hardening effect. c. ... the faster the cooling rate and shallower the hardening effect. d. ... the faster the cooling rate and deeper the hardening effect. General feedback: The smaller the surface area to mass ratio of a specimen, the slower the cooling rate , and consequen
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the shallower the hardening effect . For more information, see the section on Heat Treatment of Steels in the text. Score: 1 / 1 Question 4 (1 point) Which group below only includes materials which may form crosslinked polymers ? Student response:
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This note was uploaded on 04/04/2011 for the course MATLS 1M03 taught by Professor Okon during the Spring '09 term at McMaster University.

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1M03 2009 ASSIGNMENT 6-1 ¿¯ - View

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