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# finalsample - ECE 3025C Spring 2004 Final Exam NAME...

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ECE 3025C, Spring, 2004 Final Exam NAME: INSTRUCTIONS: 1. You are allowed four 8 1/2 X 11” sheets of handwritten original notes and calculators. 2. There are five problems. Clearly show all your reasoning and underline your answers. 3. This exam will end promptly at 2:20. Problem 1: Problem 2: Problem 3: Problem 4: Problem 5: Total Score:

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Problem 1. (35 points) A 100-Ω lossless transmission line is connected to a second line of 40-Ω impedance, whose length is λ/ 2. The other end of the half-wave line is terminated by a 25-Ω resistor. A sinusoidal wave (of wavelength λ ) having 100 W average power is incident from the 100-Ω line. a. Evaluate the input impedance to the half-wave line. b. Determine the power that is dissipated by the resistor. c. What resistance value should be used to replace the 25 Ω resistor such that all of the incident power is dissipated by the load? Be sure to show your reasoning.
. Problem 2. (45 points) A battery of voltage V 0 is connected to the left end of two lossless transmission lines, having characteristic impedances as indicated. At the line junction, a resistor is connected

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finalsample - ECE 3025C Spring 2004 Final Exam NAME...

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