EE201 -- Exam 2 March 10, 2004 INSTRUCTIONS: ♦ There are eleven (11) multiple choice problems worth 9 points each. ♦ Students who properly identify themselves with name and id number on scantron sheet will receive one extra point. ♦ To maximize our assessment of your knowledge and understanding, do NOT dwell on a single problem. If you get stuck, move on to the next problem and return later, time permitting. ♦ This is a closed book, closed notes exam. All students are expected to abide by the usual ethical standards of the university, i.e., your answers must reflect only your own knowledge and reasoning ability. Students caught cheating will receive a grade of ‘F’ for the course.11. What is the Thevenin equivalent resistance, RTH, for the two-terminal network shown (in Ω): (1) 1 (2) 2 (3) 3.33 (4) 7 (5) 5 (6) 6 (7) none of the above 2. Find the open circuit voltage, Voc, in the two-terminal network shown below (in V): (1) 1 (2) 2 (3) 3 (4) 4 (5) 5 (6) 6 (7) none of the above 2 Ω 6 V 1 Ω +_Voc+ _ 1 Ω 2 Ω ix 2 ix 1 Ω 1 Ω23. Find vout in the circuit below using superposition (in V): (1) 14 (2) 24 (3) 36 (4) 4 (5) 20 (6) 16 (7) none of the above 4. If a load resistor with the appropriate resistance is placed between terminals A and B in the circuit above (see problem 3), what is the maximum power transferred to the load (in W): (1) 10 (2) 24 (3) 32 (4) 48 (5) 50 (6) 64 (7) none of the above + _ _+30 Ω 48 V20 Ω 60 Ω 24 V vout +_A B35. A hidden two-terminal network is known to have three independent sources: a current source S1, a voltage source S2, and a second voltage source S3. The output voltage is 15 V when S1 = 1A, S2 = 2V, and S3 = 1V. Other measured data appears below. If S2 voltage is quadrupled (i.e. set to 8V), find the output voltage when S1 = 3A and S3 = 3V (in V): Vout S1 (A) S2 (V) S3 (V) 15 1 2 1 19 2 2 1 43 2 2 5 (1) 10 (2) 24 (3) 32 (4) 48 (5) 50 (6) 110 (7) none of the above 6. Find the equivalent capacitance for the shown below (in mF): (1) 1 (2) 20 (3) 9 (4) 4.03 (5) 5 (6) 6.32 (7) none of the above + 20 mF _ 5 mF 1 mF 20 mF 5 mF4 7. In the circuit below, find vout when is = 4 sin (2t) A (in V): (1) 17 cos(2t) (2) 21 sin(2t) (3) 33 cos(2t) (4) 44 cos(2t) (5) 50 sin(2t) (6) 44 sin(2t) (7) none of the above 8. In the circuit shown, the switch S has been at position A for a long time and it switches to position B at t = 2 sec. Find the capacitor voltage at t = 5 sec (in V): (1) 20 – 12e−1.2 (2) 20e−1.5 (3) 17.5e−2.5 (4) 2.5 + 17.5e−2.5 (5) 12e−1.2 (6) 20e−2.5 (7) none of the above 3 Ω is 33 µF 17 µF 25 vL + _ 0.25 H _ + vL vout + _ 20 V6 Ω250 mF 8 Ω+ _ S2 ΩBA_ + vC(t)59. Assuming iL(0−)=0 A, find the instantaneous stored energy in the inductor at t = 20 msec (in J): (1) 0.012 ± 0.008 (2) 2.400 ± 0.008 (3) 3.2 ± 0.008 (4) 0.266 ± 0.008 (5) 0.062 ± 0.008 (6) 10.563 ± 0.008 (7) none of the above 10. The circuit shown was intended to generate a repetitive waveform, but was poorly designed. The switch S (shown open) closes when the capacitor voltage equals 10 V. At t = 0 sec, vC(0−) = 6 V. Find the time when the capacitor voltage reaches 12 V (in sec): (1) 1.83 ± 0.08 (2) 2.74 ± 0.08 (3) 7.19 ± 0.08 (4) 9.35 ± 0.08 (5) 0.69 ± 0.08 (6) infinite (7) none of the above _ + 14 u(t) V 2 Ω 100 mH 16 u(t) V12 kΩ250 µF 4 kΩ+ _ S_ + vC(t)611. Find iL(t) at t = 2 msec when iL(0−) = 0 A (in A): (1) 20.3 ± 0.2 (2) 22.0 ± 0.2 (3) 3.6 ± 0.2 (4) 7.2 ± 0.2 (5) 9.5 ± 0.2 (6) 19.7 ± 0.2 (7) none of the above Theanswersare:1.42.43.54.15.56.37.38.29.410.111.5 4 Ω 22 u(t)A 10 mH 40 mH 4 Ω
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