ECE 201 Fall 2009 Exam 2 October 26 2009 Division 0101 Tan 11 30am Division 0201 Clark 7 30 am Division 0301 Elliott 1 30 pm Instructions 1 DO NOT START UNTIL TOLD TO DO SO 2 Write your Name division professor and student ID PUID on your scantron sheet 3 This is a CLOSED BOOKS and CLOSED NOTES exam 4 There is only one correct answer to each question 5 Calculators are allowed but not necessary 6 If extra paper is needed use back of test pages 7 Cheating will not be tolerated Cheating in this exam will result in an F in the course 8 If you cannot solve a question be sure to look at the other ones and come back to it if time permits 9 As described in the course syllabus we must certify that every student who receives a passing grade in this course has satisfied each of the course outcomes On this exam you have the opportunity to satisfy outcomes i ii iv and viii See the course syllabus for a complete description of each outcome On the chart below we list the criteria we use for determining whether you have satisfied these course outcomes Course Outcome Exam Questions Total Points Possible i iii iv viii 6 8 1 5 9 14 5 21 35 42 7 Minimum Points required to satisfy course outcome 14 21 21 7 If you fail to satisfy any of the course outcomes don t panic There will be more opportunities for you to do so Potentially useful formulas are x t x x t o x e t t o L R 1 RC 1 Which of the circuits shown as 1 to 7 is equivalent to the following 2 2 For the circuit below find Isc 1 0 6 A 2 0 75 A 3 1 A 4 1 2 A 5 2 4 A 6 6 A 7 none of the above 3 A variable load RL is attached to a linear network A as shown V and I are as labeled The I V plot of network A is shown on the right What are Rth and Voc for network A 1 R th 1 Voc 1V 2 R th 2 Voc 4V 3 R th 1 Voc 5V 4 R th 2 Voc 10V 5 R th 1 Voc 5V 6 R th 2 Voc 10V 7 None of the above 3 4 Find the Th venin equivalent resistance as seen at terminal A B 1 1 2 2 3 3 4 4 5 5 6 6 7 none of the above 5 In the circuit shown RL is variable Determine the maximum power delivered to RL in the circuit below 1 1 5 W 2 0 W 3 1 5 W 4 5 W 5 7 5 W 6 11 25 W 7 25 W 4 6 The inductor voltage vL for t 0 is as shown below It is also known that iL 0A The initial condition iL 0 is 1 0 5 A 2 0 5 A 3 1 5 A 4 1 5 A 5 2 5 A 6 2 5 A 7 none of the above 7 Determine the equivalent inductance Leq 1 L 2 2 L 3 1 L 3 6 5 L 6 4 1 L 4 5 10 L 7 7 L 10 8 18 L 5 8 Determine the equivalent capacitance Ceq 1 1F 2 10 F 4 4 F 5 1 F 8 3 F 4 8 16 F 3 7 3 20 F 6 6 F 9 In the circuit below the initial output voltage at t 0 is Vout 0 0 volts If Vin t 50u t 30 30u t 50 volts then what is the final output voltage Vout 1 0 V 2 30V 3 4 V 4 50 V 5 10 V 6 30 V 7 10 V 8 50 V 6 10 Determine the correct expression for the Kirchhoff Current Law KCL applied at node A 1 i1 t VA t d Vt C3 A 0 R2 dt 2 i1 t VA t d C3 VA t V3 t 0 R2 dt 3 i1 t VA t d C3 V3 t 0 R2 dt 4 i1 t VA t d Vt C3 A 0 R2 dt t 5 1 d 1 1 6 i1 0 V3 t dt VA t VA t C3 VA t 0 0 R1 R2 dt C3 t0 7 R2 VA t R1 R2 8 i1 t VA t d C3 V3 t VA t 0 R2 dt 11 For the circuit shown the source which has been off for a long time turns on at t 0 Determine V 0 1 30V 2 20V 3 10V 4 0 5 10V 6 20V 7 30V 7 12 In the circuit shown the current source is initially off turns on to 5 mA at t 0 and turns off again at t 1 ms Determine the current iC t at t 1 5 ms 1 5mA e 0 5 3 03mA 2 5mA 1 e 1 e 0 5 1 92mA 3 5mA e 1 5 1 12mA 4 0 5 5mA e 1 5 1 12mA 6 5mA 1 e 1 e 0 5 1 92mA 7 5mA e 0 5 3 03mA 13 For the circuit shown determine the time constant 1 0 267 s 2 1 00 s 3 1 27 s 4 1 40 s 5 1 80 s 6 2 00 s 7 2 20 s 8 14 In the circuit shown the current and voltage at t 0 are i 0 200mA and v 0 2V Which of the following plots best represents the voltage v t 9
View Full Document
Unlocking...