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 1 What is the Thevenin equivalent resistance RTH for the two terminal network shown in 1 1 2 2 3 3 33 4 7 5 5 6 6 7 none of the above 1 1 ix 2 ix 2 2 Find the open circuit voltage Voc in the two terminal network shown below in V 1 1 2 2 7 none of the above 1 3 3 4 4 5 5 6 6 1 6V 2 Voc 1 3 Find vout in the circuit below using superposition in V 1 14 2 24 7 none of the above 60 20 24 V 3 36 4 4 5 20 A vout B 6 16 30 48 V 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 2 5 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 15 19 43 1 10 2 24 7 none of the above S1 A 1 2 2 3 32 S2 V 2 2 2 4 48 S3 V 1 1 5 5 50 6 110 6 Find the equivalent capacitance for the shown below in mF 1 1 2 20 7 none of the above 3 9 4 4 03 5 5 6 6 32 20 mF 5 mF 1 mF 5 mF 20 mF 3 7 In the circuit below find vout when is 4 sin 2t A in V 33 F 3 is vL 0 25 H 25 vL 17 F vout 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 8 A 2 20e 1 5 20 V 3 17 5e 2 5 4 2 5 17 5e 2 5 5 12e 1 2 6 S 2 B 250 mF vC t 6 20e 2 5 7 none of the above 4 9 Assuming iL 0 0 A find the instantaneous stored energy in the inductor at t 20 msec in J 1 0 012 0 008 5 0 062 0 008 2 2 400 0 008 6 10 563 0 008 3 3 2 0 008 4 0 266 0 008 7 none of the above 2 14 u t V 100 mH 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 4 k S 1 1 83 0 08 2 2 74 0 08 3 7 19 0 08 4 9 35 0 08 16 u t V 12 k 250 F vC t 5 0 69 0 08 6 infinite 7 none of the above 5 11 Find iL t at t 2 msec when iL 0 0 A in A 1 20 3 0 2 4 7 2 0 2 7 none of the above 2 22 0 0 2 5 9 5 0 2 4 3 3 6 0 2 6 19 7 0 2 iL t 22 u t A 4 40 mH 10 mH The answers are 1 2 3 4 5 6 7 8 9 10 11 4 4 5 1 5 3 3 2 4 1 5 6
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