ece 3025 ECE 3025 A
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This 7 page Study Guide was uploaded by kayden ton on Wednesday February 24, 2016. The Study Guide belongs to ECE 3025 A at Georgia Institute of Technology taught by Prof. Alenka Zajic in Spring 2016. Since its upload, it has received 33 views. For similar materials see Electromagnetics in Electrical Engineering at Georgia Institute of Technology.
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Date Created: 02/24/16
Spring 2013 ECE 3025 Name:____________________ 2/5/2013 GT ID:____________________ Quiz #1 Note: This is a closed book and closed notes exam. You are allowed one 8 ½”x11” sheet with writing on both sides. If possible, do all your work on the page of the problem and if necessary on the back side of the preceding page. You must show complete and correct reasoning to obtain credit for each problem. No credit will be given if you do not show complete work, even if the answer is correct. Problem Points Max Points 1 20 2 15 3 20 Total 55 Z 50 0 1. (20 points) A lossless transmission line has characteristic impedance and vp1.210 m/s propagation velocity . (a) Find the capacitance and inductance per unit length. L=______________ C=______________ (b) This line is used in the system shown below. The switch is closed at t=0. Find the unknown voltages indicated on the reflection diagram. t 0 V 8V V ? 1 V 2.667V t = T V1 =______________ V t = 2T V 2 ? 2 =_____________ _ V 3 V ? =_____________ 3 t = 3T _ V 4 =_____________ _ t = 4T V ? 4 (c) What is the oneway time delay T for the line in part (b) that is long 10 cm. T=_______________ P 0 t 2T (d) Determine the positivegoing voltage power for the time interval and the P T t 3T negativegoing voltage power for the time interval . P =_______________ P =_______________ 2. (15 points) In the system shown below, the lines are initially uncharged and the switch is closed at t=0. The characteristic impedance if line #2 is not provided. 100 Z01 30 Z02 ? 20V Z02 RL 1/3 F 1/3 F (a) If the reflection coefficient (at the junction as seen from , determine the indicated values of the reflection diagram. VA _____________ VB _____________ V C _____________ V D _____________ Z 02 (b) Determine . Z 02 _____________ (c) Using your result from part (b), redraw the junction between the two lines below to show where you would place a single resistor to eliminate reflections back into line one. Provide the value of the resistor. R __________________ 3. (20 points) The transmission line shown below is charged for a long time with the switch in position A. At time t=0, the switch is moved to position B. Z 200 0 20 20V 300 200 V in (a) Determine the total input voltagbefore the switch is moved from A to B. V in __________________ VSS V SS (b) Determine the steadystate valuesand before the switch is moved from A to B. VSS __________________ VSS __________________ V in t 0 (c) Determine the total input voltage at , after the switch is moved to position B. V in __________________ V L 0 t 2T (d) Plot the total load voltage for the time interval .
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