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Unformatted text preview: ~110 NAME,--,- W ,---- l L--=L :c: S_ "--,- rJ __ CIRCUrT ANALYSIS II A. N, Willson, Jr. February 10, 2011 MID-TERM EXAMINATION Do all work in this exami nation packet. There are f our questions. Each counts 25 points. Good luckl lAo (10 points) The cirtuillO the left of nodes A and B has a Thevenin impedance Z,/t for which Rrh > 0 and X rh ~ O. The resistor NL is required to have a value that "ill maxi- mize the po,"er that will be delivered to it. 0;) '-r Z th"' Rth + jXth A :: ~ , > ' B < a.) Derive a formula for the required value of Nt as II function ofthe R.,. andX lh components oflhc Thevenin impedance Z'1r b.) lei R, - 120 and X,h - 50, and use your derived formula \0 find this optimum value of R t . lB. (5 points) Find the Thcvenin cquiyalent circuil + soM V "v for this circuit: Ie. (5 points) The op amp in this circuit is ideal. 1200 JOn Find the steady-state expression for v(I(t), I VI/ = 25cos50,OOOI V 1D. (5 points) When an eight-terminal resistive network N is subjected to various external connections, the results arc as indicated in the figure below. Determine the current I. 80 kn 40kO + 20kO 3A 3A 2A 5V N 3n 2 N I -5V+ 2A ~2A H' \ , ....", \ - \l..,",.2..l~ .. t"''''~L) \.. t IL; -'l"1Z- .... V "* 'y. -f 1 ~ ~ I.,) <;=- <.. It"' "'t RL ) '\. .,<:" )' , , , \ It; ... ~'1T.,~LI~ , L ..... (J-l'"t'-' ttL) ~~T .". LOT tL t 1. fl C .!.) Rl ~ 111"'-... ~-i ':" ~ 1~4;'1.s-' -=-l3 \..= [e l : ,,,..., \ ----...
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