2300 Exam 2 Summer 2000 - University of Houston
Name: _____________________________ (please print)
Signature: __________________________
ECE 2300 -- Exam #2
July 13, 2000
1. This exam is open book, open notes.
2. Show all work on these pages. Show all work necessary to complete the problem. If you go on to another page, indicate clearly where your work can be found. A solution without the work shown will receive no credit.
3. Show all units in expressions and figures. Units in the exam will be included between square brackets.
4. Do not use red ink.
5. You will have 90 minutes to work on this exam.
1. ________________/40
2. ________________/30
3. ________________/30
Room for extra work
1) (40 Points) The device in Figure 1 can be modeled with a voltage source in series with a resistor. The device voltage and current are related as shown in the plot in Figure 2. The device is connected into the circuit shown in Figure 3. The circuit was in this condition for a long time when the switch was closed at t = 0.
[pic]
Room for extra work
2) (30 Points) The circuit shown below was in this condition for a long time, and then the switch was opened at t = 0. Find vO(2[ms]).
[pic]
Room for extra work
3) (30 Points) The circuit drawn below is in the steady state. The voltage source vS(t) is sinusoidal and has an amplitude of 6.4[V] peak-to-peak. It operates at an angular frequency of 200[rad/s]. Find the peak-to-peak amplitude of the current iX(t), and the phase of this current relative to the phase of the voltage vS(t).
[pic]
Room for extra work
Solutions:
1) (40 Points) The device in Figure 1 can be modeled with a voltage source in series with a resistor. The device voltage and current are related as shown in the plot in Figure 2. The device is connected into the circuit shown in Figure 3. The circuit was in this condition for a long time when the switch was closed at t = 0.
[pic]
[pic]
[pic]
2) (30 Points) The circuit shown below was in this condition for a long time, and then the switch was opened at t = 0. Find vO(2[ms]).
[pic]
[pic]
[pic]
3) (30 Points) The circuit drawn below is in the steady state. The voltage source vS(t) is sinusoidal and has an amplitude of 6.4[V] peak-to-peak. It operates at an angular frequency of 200[rad/s]. Find the peak-to-peak amplitude of the current iX(t), and the phase of this current relative to the phase of the voltage vS(t).
[pic]
[pic]
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