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Unformatted text preview: ECE211 — 001
Test #3 November 2, 2005 Piint Name Re” 2 By signing I am stating that I have taken this quiz in accordance with the
NCSU honor code. Signature 1. For the circuit above, ﬁnd the input impedance. State Whether the equivalent
impedance is inductive or capacitive and Why. ' v eatmm L. a m KVL LQJEJr
\/ +3303 — J20 (CV/0+ \ok3/Q = O
V: —\)'Z+‘5/2, : 2éob(\<0>
gay :51 3‘1 l/Sbo F 1/5 H 6cos(100t)V a VR
:9” 1/ of 0
DOC/50a 2. For the circuit above, ﬁnd the steady state current, VR(t). 33’ K52,0  3’: no; 120<0° V @129} 3. a) Find the power factor of the load above. Include leading or lagging. « C053 ‘2le i, +J‘Z.
" LIL3‘2) +32 = “All? +\)’ Z.
Lliyl * l3?)
: ~J\Z—U‘US> .Z' 3 3(0—3l2
re 3 IO 4'le H 3A0 +3038 4 g 2 Tom" 0973.9 2 12.53” b) Determine the reactive power delivered to the load. 6 361051 @533 9% J IOU/L3 ;J Y
+ ,
_d v ﬁt 5cos(10t)V IOU/mi) 1/100F 4. For the circuit above, convert to the frequency domain. Deﬁne the direction of current
through the 2 inductors and write 2 equations with 2 unknowns. The 2 unknowns should
be the currents through the 2 inductors. Do not solve. J30 3 51L ~ — +23”: I'xotiwxhzo
KVL OUT 3 —5 +J$QAA+J>12 \ J r _ ' A _— F:
KVL “S +Sggit+AﬁZJi JZOLZ \I (Z or? 3\ 2cos(100t) V 5 For the circuit above, ﬁnd the current, i(t). KVL L9H: .— Zr, 5 [21:2,] +\/I + 5311 T. Q
L(0:2. +\}1 ’5 Z. Km. (an ~ 3m: 2. — Zvr 13501" 2‘0
V; : ﬁrs ﬂight
‘DMD‘i «\I _ ISIL'jzsil : Z.
_ —————————Z = o§mb4LkSo
I2” 2,5325 °
cg; m = com cub QELHXLEZ ...
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This note was uploaded on 03/31/2008 for the course ECE 211 taught by Professor Ceciliatownsend during the Spring '08 term at N.C. State.
 Spring '08
 CeciliaTownsend

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