ECE4001-Exam1-Solution-Su08

ECE4001-Exam1-Solution-Su08 - Name $11 7" 0 A Student...

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Unformatted text preview: Name: $11) 7", 0 A/ Student #: Problem 1. (30 points) For each of the following questions, circle either TRUE or FALSE, or circle the LETTER that most closely represents the correct answer, or fill in the blanks. Each question is worth 2 points. 1.1 Engineering design is a. always based upon previous work. .a process that is often open-ended. c. always yields the optimum, best solution. (1. a process which does not address manufacturability of the product. 1.2 In the United States, a working prototype is required before a patent can be issued. TRU K’@ 1.3 A company desires to patent a process used in their manufacturing processes. Of the three basic types of patents, which type should they apply for? U 1 I L I r Y 1.4 Experimental uncertainty refers to a. the difference between measurements and the true value. b. the inherent lack of confidence an experimentalist has in all his measurements. @n estimate of the bounds of the measurement error. d. the standard deviation of a large number of measurements. 1.5 Circle all the errors that apply in the plot to the right. .Resolution error b. Linearity error @ero error d. Sensitivity error e. Hysteresis error f. Repeatability error 1.6 According to the IEEE code of ethics, it is OK to accept gifts from suppliers but TRUE not from customers. June 18, 2008 2 ECE 4001 Exam #1 Name: 60 L U T/OA/ Student #: 1.7 Which of the following is NOT an element of the IEEE Code of Ethics? a. Avoiding a conflict of interest b. Making honest engineeringjudgments @imiting the profits of a company to what is fair and reasonable d. Rejecting bribes of all forms 1.8 You should NOT consider your feelings of “right” or “wrong” when making an ethics TRU- decision. racso ACCE?7’E~D 33 3/25 #5 rid/1'5 Lew gape/25 I999. : a? I 1.9 Copyrights are good for years beyond A U 2 l 112 g g Lt F22 = . 1.10 Trade Secrets for a sofiware product are best protected by a. requiring all users to have a Hardware Key. b. Copyright statements in the code listings. signed Nondisclosure Agreement with all company employees. d. a signed End User agreement from each customer. 1.11 One gallon of gas produces approximately 20 pounds of carbon dioxide. 1.12 Sustainable technology is widely understood with a clear, universal consensus on TRUE- what it means to have sustainable technology. 1.13 In a patent suit against a large company, guilt must be established beyond any TRUE @ reasonable doubt before ajudgment can be brought against the company. 1.14 As an engineering student, you are entitled to take the @ exam immediately after you graduate with your BS degree. 1.15 The CE mark is an exampie of a M A L‘ D i T0£ Ygovernment standard that must be on all electronic equipment sold in the Europe. June 18, 2008 3 ECE 4001 Exam #1 Name: SOC“ U ( / 0” gliltlfllllll! Problem 2. (20 points) For a batch of 1,000,000 light bulbs, how many are expected to last longer than 3000 hours for the two different scenarios below. Show all your calculations for each case to get 1111] credit. A. The failure rate is not constant. Instead, the mean time to failure, i.e., mean lifetime, was determined to be 2240 hours. Further, the occurrences of failures were normally distributed about this mean with a standard I deviation of 860 hours. a: H : W :0.K337 l NOT £60 50 6‘ ( FM” . l 7 7.: . MK" aZ‘fo 39w “Pmuqfonaefl 0 t9 No. LEFT z: O,ooo,ooo)(¢(38‘i) ‘- ($5?)le RFT F—lJZ. (I 3000 l-l'tMJ/Z’e B. The failure rate is constant with a mean time to failure of 2240 hours. 1‘": 9-9-‘l0 MU (Lb a, = V4") [£000,050 N _?Ut N: o e _ZoOO/-y2#0 if? 2! 000 000 6 ”f N i I “0 MP VP‘ [UT—162303} 231,0 3060 Wu, weer muse/IL 6W9 flu» THAN 3000 Ho 0 ”/3 June 18, 2008 4 ECE 4001 Exam #1 , Name: 50 C U T {0M Student#: Problem 3. (15 points) Consider four systems in parallel, which have reliability values of 0.75, 0.5, 0.81 and 0.875 after 2000 hours of operation. You may assume a constant failure rate for each of these individual systems. A. What is the total reliability of this parallel system after 2000 hours of operation? E = E .5, (p; . F, . (rm—(5'30—.§)(l—,i§l)("'l‘7§) F’5 ; o. 002‘? 68% 12$: l-f:6 :— 0.99703 AFTER 2000 H‘ouM B. What is the expected total reliability of this parallel system afier 10,000 hours of operation? _?CC Q5 3 8 6AM: a oewe fig mm «ewe, Irma zmHovM rKC'BooO) 0.00703 ; c2 fiMhfiqq-IYD’S) : ‘- kCW‘O’O) fi‘, _ _ QMCaas7o3) =1H272X10 7‘" Zorro ref?— to 000 Haves , AF ' “Cl-finxtoéqu) [€92 e _.._ 0395? June 18, 2008 5 ECE 4001 Exam #1 Name: 5 1;} L U 7—; 0 A! Student #: Problem 4. (15 points) Consider parts entering an inspection station with perfect repair. The coverage of the inspection is known to be 98%. For a batch of 200,000 parts that enter the inspection station, 3218 parts fail the inspection step. What is the expected value for the percentage of the parts entering the inspection station that were originally had. ["6 = 100,000 98 -* 374% e ., P {0.7300 3219. -2. 51w: — M = LGQS‘XW 'o‘i‘d‘ nut—owes; m 1.695% CHECK— Mud/ill. FTY - a..‘ig€0,©(‘0gg) : O‘CrXB? [-pTY‘: 0,0 léogg tease: {mmxm i (0053(8) :- June 18, 2008 32 I7»? ,2, CHECKS 0L 6 ECE 4001 Exam #1 Name: CSQéUZ ((24! Student#: Problem 5. (20 points) 021. -.-. 3154—15 =— 336%“ L$L= 32040: Bo‘irH’ Your company produces inductors to the following specification: 320 ul-Id: 5% 9% :- (”JUDCGOS') =— “OIL“ You sample the first production run of 10,000 inductors and determine that the actual mean is 322 pH and the standard deviation is 5.7 pH. You must provide a graphical sketch of the distribution showing accurately scaled values for all the parameters to receive full credit. A, What is the value of GP for this manufacturing process? P- pk: 3274M (r; '5 .7 [ml—i + T : 3 27 . V 7 05V -. OsL -- LSL— QP —- —.———6r C’P— 9536—304 1 ' -- 7.510 Boo Bio 3'20 3363 390 35—0 # (0(5‘ .73 CP 2 0.51357 B. What is the value of CPK for this manufacturing process? CPL: Mingcpufipg Cpu: USL‘E: ._- BBGvBLL ; 0'%‘%/l 7.30" '— 3(9L7) June 13, 2008 7 ECE 4001 Exam #1 ...
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