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midterm1-solns - ENG17 MIDTERM A 50 points total Important...

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Unformatted text preview: ENG17 MIDTERM A 10/15/10 50 points total Important notes: 1 This examination is closed book and closed note, no calculators or other eleCtronic devices are allowed 2 Show all your work on these pages! 3 The formula sheet is the last page of this examination; you may remove it and use it during the exam. You do not need to hand it back in. 4 Think before you start to write! Do not just try to write down everything you know — I do NOT give partial credit for “correct” formulas or analyses if they do not help you solve the problem. Excerpts from the UC Davis Code of Academic Conduct: 1. Each student should act with personal honesty at all times. 2. Each student should act with fairness to others in the class. This means, for example, that when taking an examination, students should not seek an unfair advantage over classmates through cheating or other dishonest behavior. 3. Students should take group as well as individual responsibility for honorable behavior. ' I understand the honor code and agree to be bound by it. Signature NAME (print) 35> L.) ‘55:: 5% E A3 1 15 pts Find the values of VR4 and IR; in this circuit (1 want numbers). You may use any of the techniques we have learned, but explain how you arrive at your answers or you will not receive full credit. More room is available on the following page. 1:21 a URL, are, ona—l—Q—ery‘i‘E‘oQ b5 Famodmzd 2g 6 (Li/”Mama +446.» <9er all Q1)Qz’éU§(¢\$ $Llc9wV7& A3 1 15 pts Find the values of VR4 and Lu in this circuit (1 want numbers). You may use any of the techniques we have learned, but explain how you arrive at your answers or you will not receive full credit. More room is available on the following page. iv shoe) lbwcl’ [25, is irreleuam? 1‘5 'l‘o use.“ 1 +44 ,, + ,4» Aka 5J¥6+H~u+i©vx Wcm (503/.chéf ai- 6 Vac 42/ V32“? E;- ——“———-'5 $249 Nola/f Tl/“f/ Cami wa‘l A5 2 10 pts Find the value of VA in the following circuit using superposition. Draw all three partial circuits and clearly explain how you arrive at your answer or you will not receive full credit. More room is available on the next page. A7 3 15 points Consider the circuit shown. (a) Identify and label all nodes, VA, VB etc. (do not use generalized nodes at this point, just label each individual node voltage). (b) Choose a reference node and show it on the schematic with a ground symbol. (c) Identify the essential node(s) and mark them by putting a box around their node voltage label, e.g., . ((1) Write the node equation(s) and solve for all node voltages (not just the essential node(s)). Explain how you arrive at your answers and clearly mark them or you will not receive full credit. More room is available on the next page. MO‘L’E" 44"“l' U3 l3 Unafii-Eciregfls Kati E2}- « ( Kcl—Q Ufig‘ VBCTgf’":\) «\fng. =‘-(_>.l Y3CD‘% L/UB ——- 3V!” :. ”3 B W5 1 3V l Mata medium ‘ lei-+- 4» maim- In 6—49ng Case. A9 4 10 points Solve the circuit shown usin mesh currents. Find g V51 [5'2 the true current in each 5 V 100mA branch (direction and magnitude) and clearly mark your answers on the schematic. Make it clear how you arrive at your answers or you will not receive full credit. More room is available on the next page. LL: IOOMA 2? Mod—flggcmLi‘m} magh KW, “(sot/ti L: C ‘5— C! <10+3o\ + (J; (30) :0 5+3 =- 90¢”, ‘—i _.____'. ((—5, A —5 «zoom/4 <——-— a” oNen‘itfi as {a fine... schemi Fe. 435m) 5.. ...
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