EK307Exam2SOLUTIONSFa09

EK307Exam2SOLUTIONSFa09 - SoL'U Tia” Put your answers in...

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Unformatted text preview: SoL'U Tia” Put your answers in the boxes provided! Page 1 of 4 Name EK307 —- Electric Circuit Theory: Exam #2 — Fall 2009 —— 2 hours 0 One sheet of notes plus calculator allowed. 0 To receive credit, you must put answers in boxes provided. 0 Points per problem as marked (total of 5 problems, 100 points). 0 You must show your work in a clear and concise sequence. Do not expect the graders to follow your logic if it is not adequately explained, step by step. Problem 1) [15 points] In the circuit shown below, R2 is adjustable. The LED will burn out if I'D reaches 100 mA. As R2 is increased from zero, for what value of R2 will the LED burn out? R1=62kQ R2= 3% VO=IOV {were {:3 =3>U1=UL L: w we 50 Flaws “HUM/23 VM’ VavTDuv- R32389 .1 (1‘3 :. to /Z3 \50 (UN/K 2 .B K'; 62/414: KYLJL a Vovv3 61V Problem 2) [10 points] For the circuit shown below, find the equivalent resistance seen looking into terminals A—B. <-———l'1 Fol-19 Name Put your answers in the boxes provided! Page 2 of 4 Problem 3) [25 Points] Consider the capacitor circuit shown below. 0 At t= 0, the switch is in position #1 and the capacitor is uncharged. 0 At t= 2 ms, the switch flips to position #2. R: C“? gw VA u(t) £31; w”: )mé' R2=1 where VA=10V a) What is the value of vc(t) at t= 0? 0-6 L a) 39 b) What is the value of vc(t) at t= oo? 0‘}, 330 ( C. peter/[ranged b) What is the value of vc(t) at t= 2 ms? «457m, if}, :: \[fi/Ei W 6 "0: J ,avgt’wawams/(mxj; (diff;th EiJJ' 23v c) Plot vc(t) for0<t<10 ms. 1 1‘ (ms) 'moqt d) What is the equation for vc(t) for 0 < z < oo ? , 6 (Express in numbers, not letters) irivq‘foz): lav [tw lion's) *" l 0 if (i. ’"Cw‘O‘W-é’) M C+‘“2MS> ewe) 4.. 3fwcg 116 utswzms) Name Put your answers in the boxes provided! Page 3 of 4 Problem/:35 [35 points] For the circuit shown below, derive the differential equation for vzm. +VR2*' MIL} 0} fl»sz +£'R,:\/o I 3- 0‘; + 07,27. “f 5:374 :V/O 0 KLL- 0,: (,1 1- LC: @1) Ca. «carers! 1" :"C 403—— l’ ['62 ‘ 2.1.x? C3) (:04:— Ca fig!“ @ \ £4: 80+ U: U‘z‘l'izpz 50 Q) ‘ ~> [C1 2: C" i}. fizjfl’j— f 2 ' So 6c. : Cg 34:3:— +azzelfiizr@ % g Email; 7., (M ‘ 6w; ; 6W0 ‘ @‘1 ‘ 02 + {7/37. 4- Liz +L‘C‘ )Rl'za ~ Ca Ned. Mme! vat/@R’i ' 7.. . R, Ewca C2. d0; + [53”?!va C2 P2568] £2“ 4.. V2 3 at} fié’ 2 612- Vo .v __,o ._,_._.-——-‘ + 2, Aft-L + R4 Izzcl C2,. 471:? [24:562- ‘ I???“ C 'I Name Put your answers in the boxes provided! Page 4 of 4 Problem 5* [15 points] A six-bit digital—to-analog converter with a 9—V reference has the following digital input ( MSB to LSB): D = 110 001 a) What is the decimal (base 10) value of D? b) What is the analog output VQUT of the converter? m In 2&3 Lab Questions: Logic Gates Experiment (Lab 3) From Level 1: Draw your schematic for a unamimous vote counter. Vac/e (.4126qu NB Experiment (Lab 4a) From Level 1: Draw your schematic for an 8—bit bin D/A converter: Vat/2 cam: vi: 7“ ...
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EK307Exam2SOLUTIONSFa09 - SoL'U Tia” Put your answers in...

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