EE 223
Test #1
02/25/2003
Name: _
_ / 100 pts
Open book - Closed notes - Show all of your steps in detail to get full credit!
1. Example:
(30 pts)
For the circuit shown, find:
iR(t)
3u(-t) mA
vC(t)
+
R=6k
1 mA
a) Value of the time constant
b) Is this a n
EE 223
Final Exam
05/08/2003
Name: _
_ / 100 pts
PART A - Circuit Analysis
You need to show all of your steps in detail to get full credit!
1. For the RLC-circuit given determine .
+
V(j) 1
(25 pts)
100mH 10F
2
(a) 0, f0, Q0, B, 1 & 2 (exact), 1 & 2 (appr
Problem set #11, EE 223, 4/22/2003 4/29/2003
Chapter 14, Problem 13.
Use Eq. [14] to find the Laplace transform of the following: (a)2 +3u(t);(b)
3e 8t ;(c) u(-t);(d) K , where K is an unknown real constant.
Eq. [14]
(a) L cfw_2 + 3 u (t ) =
0-
e
st
[2 +
Problem set #10, EE 223, 4/15/2003 4/22/2003
(a) s = 0;
(b) s = j9 s-1;
Chapter 14, Problem 1.
Determine the complex frequency of
each term:
(a) v(t) = 5 V;
(b) i(t) = 3 cos 9t A;
(c) i(t) = 2.5e-8t mA;
(d) v(t) = 65e-1000tcos 1000t V;
(e) v(t) = 8 + 2 co
Problem set #9, EE 223, 4/01/2003 4/08/2003
Chapter 16, Problem 1.
A parallel RLC circuit has
R=1 k, C =47 F, and L=11 mH.
(a) Compute Q0.
(b) Determine the resonant frequency
(in Hz).
(c) Sketch the voltage response as a
function of frequency if the circ
Problem set #7, EE 223, 3/11/2003 3/25/2003
Chapter 12, Problem 17.
The phase impedance Zp in the system shown in Fig.
12.31 consists of an impedance of 75 in parallel
with a 25-F capacitance. Let Van = 240 V at 60 Hz,
and Rw = 2 . Find (a) IaA; (b) Pwire
Problem set #6, EE 223, 3/4/2003 3/11/2003
Chapter 12, Problem 3.
A six-phase power system is developed as part of a high-current dc magnet power supply. Write the phase
voltages for (a) positive phase sequence; (b) negative phase sequence.
(a) positive p
Problem set #4, EE 223, 2/06/2003 2/13/2003
Chapter 9, Problem 23.
After being open for a long time, the switch in the
circuit of Fig. 9.38 is closed at t = 0.
For t > 0, find (a) vC(t); (b) iSW(t).
(a)
1
1093
1
109
2
=
= 5000, o =
=
= 1.25 108
2RC 2 20 5
Problem set #3, EE 223, 1/30/2003 2/06/2003
Chapter 8, Problem 68.
Find vC for t > 0 in the circuit of Fig. 8.93.
vx vx 3 vx
+
= 0vx = 1, voc = 3 1 = 2V
100 100 100
v
v
SC: vx = 3Visc = x + x = 0.06A
100 100
Rth = voc / isc = 2/ 0.06 = 33.33
OC:
1.5
volta
Problem set #2, EE 223, 1/23/2003 1/30/2003
Chapter 8, Problem 21.
The switch in the circuit shown in Fig. 8.53 has been
open for a long time before it closes at t = 0.
(a) Find iL(t) for t > 0.
(b) Sketch vx(t) for -4 < t < 4 ms.
(a)
20
24
iL (0) =
= 0.4