ENGR-A110FallHomework7

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Dec 6, 2023

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W.D. Cottrell, Ph.D. ENGR-A110 Due October 11th, 2023 Homework Assignment #7 Name___________________________________________ Engineering Design Considerations, with Sustainability & Optimization Various multiple-choice questions and exercises on the topics listed above. Please download the assignment, and write your responses directly on the pages. Submit the hard copy. Consult the Lesson 8 & 9 slides. 1. In the Igor Sikorsky Human-Powered Helicopter (HPH) Competition, what school was the first to get airborne ? Consult any reliable reference on the competition, which lasted from 1980 to 2013. a. Cal Poly San Luis Obispo b. Nihon University c. University of Maryland d. University of Toronto 2. How much money was offered initially, in the Igor Sikorsky HPH Competition, for a winning design? a. $ 2,500 b. $ 25,000 c. $250,000 d. $2.5 million 3. During the period of the Igor Sikorsky HPH Competition, what was the maximum number of years that passed with no entries able to get airborne?. a. None b. 9 c. 15 d. 33 4. In the photo in Figure 3.1 in the textbook, what are the two engineers designing? a. Oscillating fan b. Projectile launcher c. Rotary engine d. Wind turbine 5. In Table 2.2 in the textbook, excluding sleep, on which activity does the freshman engineering student spend most of his or her weekly time? Be sure to indicate the number of hours next to your selection. a. Calculus (class & study) b. Chemistry (class & study) c. Exercise & recreation d. Relaxing 1
W.D. Cottrell, Ph.D. ENGR-A110 Due October 11th, 2023 6. In the 2015 film Spare Parts , what type of engineering design competition did the students enter? Consult any reliable reference. a. Concrete canoe b. Drones c. Human-powered aircraft d. Robotics 7. Also, in Spare Parts , the students were from what type of institution? a. High school b. Community college c. University (undergraduate) d. University (graduate) 8. An engineering design team developed an alternatives evaluation, with four design criteria: appearance (1), cost of production (2), ease of use (3), and safety (4). The team chose safety over appearance, cost of production and ease of use. One team member chose appearance over ease of use. Two team members chose appearance over cost of production, and three team members chose ease of use over cost of production. How should the design criteria of appearance, cost of production, ease of use, and safety be rated in an evaluation – that is, in what order, from highest to lowest score? a. 1, 2, 3, & 4 b. 3, 1, 2, & 4 c. 4, 1, 3, & 2 d. 4, 3, 2, & 1 9. The CEO of a small engineering firm – the company is so small that it is not required by the federal government to depreciate its assets – is considering the purchase of a company car that the CEO will also use on the weekends. Four cars are being considered, and the selection criteria are comfort, cost, fun, kayak (i.e., whether or not the car can transport a kayak), look, and storage (i.e., interior storage space). The CEO has rated each car according to how well it meets each criterion, as shown in the following table. The CEO is uncertain about the importance of each criterion, though. If each criterion is worth the same , then which car should be selected? Be sure to indicate the score next to your selection. The procedure is similar to that shown in the textbook, and in Lesson 9. Car Comfort Cost Fun Kayak Look Storage Family car 4 3 0 2 0 1 Sports car 2 1 5 0 5 0 Station wagon 5 4 1 5 1 5 SUV (4 x 4) 4 2 4 5 4 4 a. Family car b. Sports car c. Station wagon d. SUV (4 x 4) 10. Regarding the preceding problem, after some consideration, the CEO decides to assign ratings to the selection criteria as follows: comfort-4, cost-5, fun-2, kayak-5, look-3, & storage-5. Using the weighted criteria, which car should the CEO select? Be sure to indicate the score next to your selection. a. Family car b. Sports car c. Station wagon d. SUV (4 x 4) 2
W.D. Cottrell, Ph.D. ENGR-A110 Due October 11th, 2023 11. A mechanical engineering team is working on a Walk-Behind Power Lawnmower design. Seven design criteria are being considered, with the following priorities: Criteria Priority Safe to operate Essential Economical High Portable High Easy to start & operate High Easily serviced Medium Cuts grass at 1.5" to 4.0" Medium Aesthetically pleasing Medium The team decides that Essential is worth 4 points, High is worth 2, and Medium is worth 1. Three alternatives are being considered, with criteria ratings as follows. (3 = meets or exceeds criterion; 2 = meets criterion less well; 1 = does not meet criterion). Criteria Gas-Powered, Manual Start Gas-Powered, Electric Start Electric Powered Safe 3 3 3 Economical $100 $170 $80 Portable 2 1 3 Easy to start & run 1 2 2 Easily serviced 2 1 3 Cuts grass to 1.5-4" 3 3 3 Aesthetics 2 3 1 Based on the preceding information, which lawnmower should be produced? Be sure to assign reasonable scores to the costs in the "Economical" line. Also, indicate the total score next to your selection. a. Gas-powered, manual start b. Gas-powered, electric start c. Electric powered d. None of the above 12. In the preceding problem, the design team observed that the electric-powered lawnmower needs to be recharged, while the other two do not. What should the design team do about their observation? a. Add "Needs recharging" to the design criteria, assign it a rating, and reevaluate the alternatives. b. Adjust one or more of the existing design criteria scores for the electric-powered lawnmower. c. Drop the electric-powered lawnmower from consideration. d. Ignore the recharging need, and continue with the original selection. 13. According to the Wikipedia article "Robot Competition," which of the following is closest to the number of robotics competitions for students (only), worldwide, as of this writing? a. 15 b. 25 c. 35 d. 45 3
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W.D. Cottrell, Ph.D. ENGR-A110 Due October 11th, 2023 14. The City of Costa Mesa has a LEED Gold Certification (for cities & communities) because of which of the following sustainability-related measures? Consult any reliable reference, such as the City’s official website. a. Greenhouse gas emissions per capita b. No-growth plan to limit development c. Percent of solid waste that is recycled d. Solid waste generation per capita 15. Which of the following is closest to the number of LEED-certified buildings worldwide ? a. 1,000 b. 10,000 c. 100,000 d. 1 million 16. Which of the following categories carries the most weight in the LEED Green Building certification process? a. Energy efficiency & atmosphere b. Indoor environmental quality c. Sustainable sites d. Water efficiency 17. Which of the following buildings in Costa Mesa is LEED Platinum -certified? a. Canon Experience Center, 123 Paularino Avenue b. Class A Park Tower Office Building, 695 Town Center Drive c. Fixtures Living, 3303 Hyland Avenue #D d. Tiffany & Co., South Coast Plaza 18. Identify each of the following famous logos by indicating the associated company or organization. 4
W.D. Cottrell, Ph.D. ENGR-A110 Due October 11th, 2023 19. A manufacturing firm produces two components for electric scooters. An axle requires 2.4 min of molding time and 5.0 min of assembly time. The profit for axles is $0.60 per unit. A single handlebar grip requires 3.0 min of molding time and 2.5 min of finishing time. The profit for grips is $0.70 per unit. The molding department has 1,200 minutes of time per week to allocate to these products. The finishing department has idle capacity of 600 minutes per week, and the assembly department can supply 1,500 minutes of capacity per week. The firm wants to determine the optimum production amounts of axles and grips this week using a linear programming method. In the formulation, how many constraints (i.e., constraint equations) are there? a. 3 b. 4 c. 5 d. 6 20. How many objective functions are there? a. 1 b. 2 c. 3 d. 4 21. Which constraint involves two variables? a. Assembly time b. Finishing time c. Molding time d. All constraints 5