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Unformatted text preview: View Results Assignment 6 (Ch 10, 11, 14 & 15) Name: SIAMAK KIANI Attempt: 1 / 3 Out of: 20 Started: April 5, 2009 7:35pm Finished: April 6, 2009 1:52am Time spent: 6 hr, 17 min., 45 sec. Student finished 473 hr, 42 min., 15 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) Consider a steel alloy which has a carbon composition less than the eutectoid composition. How many degrees above the upper critical temperature would you heat the alloy to fully anneal it? Student response: Correct Response Student Response Answer Choices a. 10 to 25C b. 15 to 40C c. 25 to 50C d. 35 to 70C e. 55 to 85C General feedback: For more information, see the section on Annealing Processes in the text. Score: 0 / 1 Question 3 (1 point) In order to improve their heat treatability , medium-carbon steels are alloyed with which of the following elements? Student response: Correct Response Student Response Answer Choices a. Silicon, Molybdenum, Vanadium b. Copper, Vanadium, Manganese c. Chromium, Copper, Nickel d. Chromium, Molybdenum, Nickel General feedback: Medium-carbon steels are alloyed with chromium , molybdenum and nickel in order to improve their heat treatability. These elements help allow more martensite to form during cooling. For more information, see the section on Heat Treatment of Steels in the text. Score: 0 / 1 Learning System Quiz Homepage http://webct.mcmaster.ca/SCRIPT/MATLS_1M03_T2_09/scripts/student/... 1 of 6 4/6/2009 1:53 AM Question 4 (1 point) Which of the following is more likely to crystallize ? Alternating copolymer Random copolymer Student response: Correct Response Student Response Answer Choices a. The random copolymer is more likely to crystallize. b. The alternating copolymer is more likely to crystallize. c. You can't tell which one is more likely to crystallize....
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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.
- Winter '09