Sample Midterm 2.pdf - ECE 333 UMass Amherst Sample Midterm 2(Questions are from 2015 2016 and 2019 midterms with slight modifications 1(25 points

# Sample Midterm 2.pdf - ECE 333 UMass Amherst Sample Midterm...

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ECE 333 UMass Amherst 1 Sample Midterm 2 (Questions are from 2015, 2016, and 2019 midterms with slight modifications) 1.(25 points) Through a generator resistance of Rg= 150 (), a dc voltage of 20 (V) is applied to a 50-transmission line of length lat t= 0. At the load end (z= l), an infinitely long transmission line with a characteristic impedance Z1= 100 () is connected. Step wave propagation in the 50-line (i.e., 0 ≤ zl) is of interest. In your sketches, clearly indicate the numerical value of the level or change of voltage or current due to each reflected wave. (a)(9pt) For 0 ≤ zland 0 ≤ t≤ 5T(T= l/up; up= speed of propagation), draw separate voltage and current bounce diagrams. (b)(8pt) At the mid-point (z= l/2), sketch the voltage waveform V(z= l/2, t) with respect to tfor 0 ≤ t≤ 5T. (c)(8pt) At the instant t= 1.5T, sketch the current waveform I(z, t= 1.5T) with respect to zfor 0 ≤ zl. 2.Z0= 50 20 V z+ Rg= 150 t = 0 l0 Z1= 100
ECE 333 UMass Amherst 2 3.

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