Transcript quizzes
EE211 Quizzes Spring 2000 Instructor: Dr. K.D. Donohue Quiz 2 • Find the Voltage Vs and Current Is in the circuit below if each 8 load is absorbing 2 W. Is Vs 8 8 Quiz 3 • Determine IL in the circuit below: Ix 8k IL 24 mA 16k 2Ix Quiz 4 a) (2 points) Simplify circuit to find Vs, b) (1 point) then expand to find I1. (SHOW YOUR WORK CLEARLY) 8 k 24 mA + Vs - 20 k 4 k 8 k I1 4 k Quiz 5 A) (1.5 points) Find Vx by nodal analysis. B) (1.5 points) Find Ix by loop analysis. + Vx Ix 10 6 12 V 2 3 Vx 5 Quiz 6 Find Vo in the circuit below. (Show clearly how you obtained this result for full credit!) 60 k 20 k 30 k 3V 2V + Vo - Quiz 7 Use Thevénin’s theorem to find V0 in the Circuit below: + Vx 2 4 3A 6 3Vx 2 + Vo - Quiz 7.5 (Take Home) This is due Tuesday March 7, 2000 at the beginning of the class period. All students are to work independently on this. There is to be NO COLLABORATION on this work. Any detected cheating will result in an E for the course for all involved parties. You are free to use any book, notes, or computer program to solve this. If you get a result from a computer, please indicate the program used to obtain the result. Otherwise all work to obtain the result should be clearly shown. A. Derive a set of equations that completely describe all node voltages or loop currents in the circuit below (1.5 points). B. Use the set of equations to find Vo (0.5 points). C. Simulate the circuit in SPICE and determine Vo (submit printout of SPICE schematic with meter reading) (1.0 points). 100 Ix 5 20 4 10k 20 40 8V 10 + Vx - 10Ix 2Vx 5 + Vo - Quiz 8 Find a circuit that will effectively integrate the voltage vi(t) when connect to the terminals AB. Specify resistors, capacitors, and inductors, and initial conditions such that the relationship between the input and output (vo(t)) is t given by: vo (t ) 0 1 k A vi(t) B vi ( x)dx Quiz 9 A)Use differential equation approach to find iL for t > 0 (2.6 points) B)Determine the time constant for this circuit for t > 0 (0.4) points t=0 15 A iL 75 3H Quiz 10 Determine equation for vo(t) for t > 0, when subjected to input pulse shown in figure. Input voltage vs(t) 6 5 volts 4 10k 5k 3 2 1 + vs(t) 10k .05mF vo(t) - 0 -1 0 1 2 seconds 3 4 5 Quiz 11 Find the equation for i(t), t > 0 t=0 10 0.46mF 10 V 0.1H Quiz 12 (Take Home) (a) Use SPICE to plot io(t) for t > 0. The time axis should be long enough to show current has reached an effective steadystate. (2 points) (b) Find complete solution for io(t) for t > 0 analytically. (1 point) 1k 5[u(t)-u(t-0.5)] V 0.1mF 1k io(t) 2H Quiz 13 Find the equivalent impedance Zeq for the circuit below, if the source driving it has a radian frequency () is 100 rads/sec: 0.25 mF 20 Zeq 30 0.5 mF 0.2H Quiz 14 (Not for Credit) Find the steady-state response for vo(t), when =10k radians/s: 1 k 2 cos(t ) V 0.1 F 0.1 H 10 k + vo(t) - ) V v ( t ) 1 . 42 cos( 10 k t 39 . 29 ANS: o