ECE4001_Exam 2A Fall 2009 Solutions

ECE4001_Exam 2A Fall 2009 Solutions - Exam 2 ECE 400] -...

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Unformatted text preview: Exam 2 ECE 400] - Engineering Practice and Professionalism N0vember_2_, 200.9 Page 1 of6 Name: _ Student Number: 50 {9A 1. Check that your exam includes all 6 pages (cover, 4 problems, one blank page). 2. Read all instructions and problems carefully. Points will be deducted for failure to follow instructions. 3. PRINT your name and student number in the spaces at the top of all the pages ofthis exam. 4. Show ALL of your work on pages provided and do not separate any of your exam pages 1 through 6. UI If you need extra space, use the blank page provided, page 6. Note the appropriate problem for any work on this blank page. 6. You are permitted one sheet {8 NZ x l l, double—sided) of handwritten notes. Photocopies of handwritten notes are not permitted. Use of any other notes, books, or other resources is prohibited. 7. Calculators are permitted; however, you are not allowed to use the calculator memory to store notes, etc. 8. Cell phenes and other electronics are not permitted. 9. This exam lasts for 50 minutes. 10. The Georgia Tech honor code applies. T o reCognize the implications, please sign the following: "I did not give or receive aid during this exam, nor will I discuss the exam with anyone who intends to take it at a different time" Signature: _ Problem I. (25 points possible) Problem 2, (25 points possible) Problem 3. (25 points possible) Problem 4. (25 points possible) TOTAL. (100 points possible) ‘—‘---._.... Name: Student #: Problem 1. 0p Amp Requirement (25 points) High Power Op Amps are required for your companies new high fidelity speaker designs. As part of the design requirements, the op amps must last for at least 11,500 hours of operation with an 85% confidence level. Based on the data supplied by one of the potential op amp manufacturers, should youehoose this manufacturer’s product. m Number of Hours before Failure 1 met 2 9x103 3 3.3m3 4 1.2x10“ 5 1.07;;10‘1 2 : )l5‘00'~ 10000 army/m" “:9 on"; 1232 ammo; law? Name: Student #: Problem 2. Connector Cable Manufacturing Variation (25 pts) A connector cable manufacturer defines a defective connector as one with a resistance of less than 4 ohms. The manufacturing engineer have sampled a production run of 20,000 connectors and determined that n = 3 ohms and o — 0.28. How many connectors are expected to not meet specifications? Is the manufacturer’s manufacturing process capable? -LsL 3—H! V— ?(i‘ > $573 239998 =7 ‘Prabaéti/Ifir Define/Hum 2 ?fi«952 *‘9 7’? fla/mw; mi- Mae-Hg if“ : )9xfifé'y 1) 3 {new grfz 5.. ‘ 7* ‘ 'fr . 4 g Pfliu’si )5 Dev/— cat/6.41s: 3 “k 27 Name: Student #2 Problem 3. Accounting: Depreciation (25 points) Compare MACRS Depreciation Method to the Straight Line Method. Your manufacturing engineering group decides to buy a piece of capital equipment for the manufacturing facility. The original cost of the equipment is $400,000 with a lifetime of 5 years and a salvage value of $50,000. Construct a chart showing the depreciation and the book value starting at year I for BOTH the MACRS and Straight Line depreciation models. The MACRS deprecation table is given below. 5—year 20.00 33.00 I920 H.212 “.52 5.?6 mP‘CK S Skaizjhf [ulna D{rr{ {‘I‘L‘i-Ilil" Beak. via-{R Di? Prat; {AT—"(an gas/e 6:, )érir l ’3’0,ooo li3'«’.0,.-06"0 byoiaaa filo/000 \ft. '2_ SIP/13,000 5;€2,oac 517030.21; izéo’aofi \/‘,. 3 2.00 {qoiddb filed! (300' Yr "I 379(030 367/30 1703mm ‘5 yzoflnd‘?‘ Yr 5* fiqe’ofi'o 123‘;an a 709cc 1‘ jar/soc \ (a 52's 0% 0 ~._.-- “‘— ‘r J Sal tiff/k Van/MC Name: I Student #: Problem 4. Engineering Measurements: Voltmeter {25 pts) An engineer has made a voltage measurement of 2.31 volts using a voltmeter with the specification given below. What is the total uncertainty in the measurement with a 95% level of confidence? 8-bit ND Converter for measuring voltage with an input range of -5 to +5 volts (10 Vpp) 8 bits corresponds to 28 = 256 levels Specifications: ‘ {J I . 1 ’ 8-bits ofresolntion j; A I y; CLCL Uh CE “\fi} l'C' S“ t - Input range of -5 to 5 volts - Relative accuracy: :l: 0.9 LSB typical Sensitivity error: 0.1% ofreading (max) RC 50 (“Fth '1 j: .; (a , 03$ /) Z I 0.0 ITS" Offset error: :t SmV (max) O Assume “typical” means :: lo Assume“max”means i3o ACCWGC‘Y :- j: Z. I): O70? . _Ir __ 4‘ lbs» : ., We Digger“ ; fS‘mv We 2 foeoahr 7. Z 2 I 0.0:79”) + (0.0")e‘f) +(fl0033) 0.00! t: Verb V‘s/fa} 1 2.3! 1‘ 0.07 Vd/IS ...
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ECE4001_Exam 2A Fall 2009 Solutions - Exam 2 ECE 400] -...

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