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Unformatted text preview: @ EE411, Mid Term Exam, Thursday, October 16, 2003. Name 7 I EE !
Seven Equally Weighted Problems. Show All Work On These Pages. One Page of otes Permitted. Problem 1. When the switch closes, the voltage across the 3052 resistor rises to 40V. Find the ‘
numerical value of x in ohms. +40_
 >3 100V 40:10013—35—233) 40(30+3)>100(30),1200+40g3000"
' 403:! #300 1 + , ' ISSO 4'
é/‘wk ”DEL 30 164l80=453u 3L: To . 55L 4"“;4 ' 3:11??? €451) Problem 2. Use the nodal method to write one equation and solve for the voltage at Node 1. 0.040? 5009
Nodel a
1209 \ 40V Check?
E70213 ‘ QW 70,044? +0 0645'
40V 10V 4’04
e 0. 2!? (on)
C “ V '
«4,0
1 ___I_ \j(:/D)
[RD ‘F 200+ V500 J’pl :
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VI (12L; 200 + ELOD)’ IL!) é” 0'! Page lof4 EE411, Mid Term Exam, Thursday, October 16, 2003. Name 7 I E; ?
Seven Equally Weighted Problems. Show All Work On These Pages. One Page f Notes Permitted Problem 3. Write mesh equations for meshes l and 2 1n the circuit shown. Eliminate I3 and V A from your equations, and then put your two equations in the matrix template below. The matrix must contain
numbers only. Do not solve the equations. 40V @ ,404, 10(1'Iv1234,$(1‘ .4194.» lo 5'0 @ {orZ + 3[I II33+IO(J:;I,) =0
Also/ I3 :0 9vA~ I 500%; 1:2,): §(I, 1:3) 9*" ”+0 @ 140+“): l0L2+3I '+0:VI,+4OI;+10= o
“ ", Q9 (012+31flgl, +ISI2+ 1012 3/51, :0 \/ Problem 4. Find the Thevenin equivalent circuit for terminals ab for the circuit shown. . 0
30:2 ,ggg s l. 2334 III/I _
VX :40 20 mu)" WZYV. 1%., [333,9 I :, 1333+001+A Page 2 of 4 i EE411, MidTerm Exam, Thursday, October 16, 2003. Name K E! 3
Seven EquallyWeighted Problems. Show All Work On These Pages. One Pag of Notes Permitted. Problem 5. Coils l, 2, and 3 1n the circuit shown have mutual inductances M12, M13, and M23. Write ‘ the mesh equation for Mesh 2. Problem 6. The switch has been closed for a long time when suddenly it opens at t = 0. The graph of
current i(t) for t Z 0 is given. Estimate the values of R1 and R2.  g. 6= "
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Bil RV” L/l‘: zoxm'k N. g 7 0 10 30 40 50 6O 7O 80 90 100 Time  m lcroseconds Page 3 of 4 . EE411, Mid Term Exam, Thursday, October 16,2003. Name Kg! ’ Seven EquallyWeighted Problems. Show All Work On These Pages. One Page of Notes Permitted. Problem 7. The switch has been at positionx “x ” for a long time, and the IOuF capacitor is completely 4‘ 99 discharged. Suddenly, at t = 0, the switch moves to position y.
' 209 200 a. Develop an expression for i(t), t Z 0.
b. Carefully sketch i(t), t > 0, showing ,
' ‘ values of i(t) for t = It, 31:, and the 30V asymptote. 'V ' L
c. What will be the ﬁnal voltage across 
the lOuF capacitor? ' um um 344:; w .
' x K ”/0
FDR, "6’70, C ,2?sz w sea/es/ ca 63:5 ZHD 2 X/uF FORl; 0+10+.—ZO/5’ ,5
H M4 £1 :(Olaﬁw I (no): Page 4 of 4 ...
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