Electrical Engineering 117A - Fall 1998 - Schwarz - Midterm 1 - EECS 117A Midterm#1 Fall 1998 EECS 117A Fall 1998 Midterm#1 Professor S.E Schwarz

# Electrical Engineering 117A - Fall 1998 - Schwarz - Midterm 1

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EECS 117A, Midterm #1, Fall 1998 EECS 117A, Fall 1998 Midterm #1 Professor S.E. Schwarz Instructions: You may use the textbook, a pocket calculator, and drafting instruments. Write answers in the space provided. Show your work on the Smith chart. Problem #1 (30 points) The circuit below contains a Thevenin voltage source and two transmission lines of length l1 and l2. Let T = l1/U (where U is the phase velocity), l2 = 1.25l1, Rs = Z0/2. The voltage source v(t) = 10 volts for 0 <= t <= 0.2T, and zero for other times. Graph the voltage between terminals A and A' on the scales below, over the range 0 < t < 4.8T. Show amplitudes of pulses clearly on the graph. (Note: The lines are not the same length, l2 = 1.25l1.) Problem #2 (35 points) (1 of 4)1/27/2007 4:28:53 PM
EECS 117A, Midterm #1, Fall 1998 In this problem the transmission line has a certain amount of loss, so that k = beta - j*alpha. (a) (10 pts.) Assume the voltage phasor representing the wave moving to the right at position AA' is v_+(A) = V1. What is the phasor

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