Ex1_f09_Solutions - Test 1 Version B EEL 3111C Fall 2009...

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Unformatted text preview: Test 1 - Version B EEL 3111C Fall 2009 Drs. Srivastava, Zmuda Last Name First Name Section # Answer all parts of all four (4} questions Show all work Put your name on every page Two (2) hour time limit One (1) 3 by 5 index card allowed Closed note, closed book PROBLEM 1 (4 points each) (a) In one line, state the passive sign convention. Do not mention anything about powerw lflx‘e «mick AMMW-fl pr 0 -l \l‘ --e‘_r3 (b) Inacircuit, VAB=20 V, ch=10 V. Find VGA. '5 B V _ C Van-Vm-dcs —0 h, a + G O \lhc -'= \ll‘lB -‘J¢—I‘5 , : 2o -- Io=Io -- Van's—'0 (c) Does an ideal voltage source always absorb negative power, i.e.. does it always supply power? Briefly explain. Moflm?‘ l4 \‘hhww. (d) Briefly explain the significance of Thevenin's resistance. No formula, please. mfigmmlme W.Lm L Li, (e) Define what is meant by a 'node'? Test 1 — Version B _ Page 1 (d) V“: ‘1-10 :2- (e) 3'3Z‘T The power absorbed in the source. P5 = Tmtl—mean Page3 PROBLEM 3 Continued Part b: (15 points) In the following circuit. all the mesh currents (:1. i2, i3, n) have already been assigned. Write all the necessary and sufficient equations for nodal analysis. Your answer MUST be expressed only in terms of constants and mesh currents. Number each equation to be graded. Unnumbered e nations will not be graded. ‘r. I}: Lr/L: © go %=5(L3'Ll)—?I?+?(Lg'is)® L. )o— ZMLHCL?—Lt)*zck*_1’)+3li~f ® (a , O :- 3113 F¥LL1’L1)¥L(£9”L12¥3L:+?'U:4-£3)+ VI} Test 1 — Version B Page 5 . H (A. 1"?) PROBLEM 4 Continued I (b) (10 points) Find the Thevenin's resistance Rn. at the terrntnals A and 8. Use any method. Write your final answer in the space provided. ‘ .3" ‘ V3 "YIfi‘HO-Lfi : S‘L,‘ ‘- LO {0 L170 l V V .— ‘i—‘fi :3 5’ e’ 5 LA“ Rm: 12.531 5’ 2" (c) (5 points) Show (draw) the Norton’s equivalent circuit. DAN/(Elfin— (d) (5 points) Suppose You found that VT“ = 15 V and R11, = 20-!) (these are not necessarily the conect answers to parts a and b). Find power PL dissipated in a 10-0 load resistor connected to terminals a, b. Write your final answer in the space provided. to [0 .. .. | .._————- \/ is V“ I 30 r '5’ 11... 2 _......——lr : J- A- u 7' FL: PLEASE SEE THE LAST (NEXT) PAGE. YOU MUST SIGN IN THE SPACE ALLOCATED. % Test 1 — Version B Page 7 I have abided by the University Honor Code: ‘-‘—-——.——H— Signature END YOUR GRADE ON THIS TEST IS: -—————_____ Test 1 - Version B Page 8 PROBLEM 4 Consider the following circuit: 209 (a) (10 points) Find the Thevenin‘s equivalent voltage Vn. at the terminals a. 5. Use any method of your choice. Write your final answer in the space provided. 3 g (o: :01, 4 51/; 14-124 1:11) ILL ""\ L1”I‘;l° 11‘1—1‘ [0:51.+zrl._ L,=Iz_-Io [0: SCIL—to)i-z.r TL =9 (0:.30 ’Iz—r’h :80- \JQCZVfi‘J'S'51-233 IL ,j-J.’ Test 1 — Version 3 Page 6 PROBLEM 3 Part a: (15 points) In the following circuit, the reference node has been chosen all the nodal voltages (V1, V2, V3, V4) have already been assigned. Write all the necessary and sufficient equations for nodal analysis. Your answer MUST be expressed only in terms of constants and node voltages. Number each equation to be graded. Unnumbered e uations will not be graded. Test 1 — Version B Page 4 PROBLEM 2 Consider the following circuit: Given that 120 = -1 A and 13 = 4 A. using ONLY Ohm’s law, KVL, and KCL find the following quantities (4 points each): Do NOT use mesh or nodal analysis. (a) 15: 19 JIM == ‘t-Crx)=-S' l=§P< (b) V“: —\/u--\}( —.— "7—0114; —? it = “ht-I) 4C4») “47/ 210*31-‘4L Test 1 — Version 8 Page 2 ...
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