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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 AMMWﬂ
pr 0 l \l‘ e‘_r3
(b) Inacircuit, VAB=20 V, ch=10 V. Find VGA. '5 B V
_ C
VanVmdcs —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“: ‘110 :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‘HOLﬁ
: 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
100 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/; 14124 1:11) ILL ""\ L1”I‘;l° 11‘1—1‘
[0:51.+zrl._ L,=Iz_Io
[0: SCIL—to)iz.r TL =9 (0:.30 ’Iz—r’h
:80
\JQCZVﬁ‘J'S'51233 IL ,jJ.’ 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 == ‘tCrx)=S' l=§P< (b)
V“: —\/u\}( —.— "7—0114; —? it = “htI) 4C4»)
“47/ 210*31‘4L Test 1 — Version 8 Page 2 ...
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 Summer '09

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