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by: kayden ton

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# ece 3025 ECE 3025 A

kayden ton
Georgia Tech
GPA 3.72

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ece 3025
COURSE
Electromagnetics
PROF.
Prof. Alenka Zajic
TYPE
Study Guide
PAGES
7
WORDS
KARMA
50 ?

## Popular in Electrical Engineering

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 vp1.210 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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