Chapter 18 solutions_to_exercises(engineering circuit analysis 7th)
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Transcript of Chapter 18 solutions_to_exercises(engineering circuit analysis 7th)
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
1. (a) 5, 10, 15, 20, 25 (all rad/s) (b) 5, 10, 15, 20, 25 (all rad/s) (c) 90, 180, 270, 360, 450 (all rad/s)
PROPRIETARY MATERIAL. Β© 2007 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
2. (a) Οo = 2Ο rad/s, f = 1 Hz, therefore T = 1 s. (b) Οo = 5.95 rad/s = 2Ο f rad/s, f = 0.947 Hz, therefore T = 1.056 s. (c) ) Οo = 1 rad/s = 2Οf rad/s, f = 1/2Ο Hz, therefore T = 2Ο s.
PROPRIETARY MATERIAL. Β© 2007 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
3.
( ) 3 3cos(100 40 ) 4sin(200 10 ) 2.5cos300 Vv t t t tΟ Ο Ο= β β Β° + β Β° + (a) V 3 0 0 0 3.000 Vav = β + + =
(b) 2 2 2 21V 3 (3 4 2.5 ) 4.962 V2eff = + + + =
(c) 2 2T 0100o
Ο .02 sΟΟ Ο
= =
v ms = β β Β° + Β° + Β°
=
(d) (18 ) 3 3cos( 33.52 ) 4sin(2.960 ) 2.5cos(19.440 ) 2.459 V= β
PROPRIETARY MATERIAL. Β© 2007 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
4. (a)
t v t v
0 2 0.55 -0.844
0.05 2.96 0.6 0.094
0.1 3.33 0.65 0.536
0.15 2.89 0.7 0.440
0.2 1.676 0.75 0
0.25 0 0.8 -0.440
0.3 -1.676 0.85 -0.536
0.35 -2.89 0.9 -0.094
0.4 -3.33 0.95 0.844
0.45 -2.96 1 2
0.5 -2 (b) (c) min 3.330v =
2 2
2
max
4 sin 2 7.2 cos 4 04sin 2 7.2(cos 2 sin 2 )
4 16 414.724sin 2 7.2(1 2sin 2 ) 0.5817, 0.8595 sin 228.8
0.09881,0.83539 0.5593 for smaller max)
tt t t
t t x t
t v
v tΟ Ο Ο Ο
Ο Ο Ο
3.330(
Ο Ο Ο
β² = β + =
β΄ = β
β Β± +β΄ = β β΄ = = β =
β΄ = β΄ =
PROPRIETARY MATERIAL. Β© 2007 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
5. (a) a0 = 0 (b) a0 = 0 (c) a0 = 5 (d) a0 = 5
PROPRIETARY MATERIAL. Β© 2007 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
6. (a) a0 = 0 (b) a0 = 0 (c) a0 = 100 (d) a0 = 100
PROPRIETARY MATERIAL. Β© 2007 The McGraw-Hill Companies, Inc. Limited distribution permitted only to teachers and educators for course preparation. If you are a student using this Manual, you are using it without permission.
Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
7. (a) a0 = 3, a1 = 0, a2 = 0, b1 = 0, b2 = 0 (b) a0 = 3, a1 = 3, a2 = 0, b1 = 0, b2 = 0 (c) a0 = 0, a1 = 0, a2 = 0, b1 = 3, b2 = 3 (d) 3 o o ocos(3 10 ) 3cos3 cos10 3sin 3 sin10t t tβ = + a0 = 0, a1 = 3cos10o = 2.954, a2 = 0, b1 = 3sin10o = 0.521, b2 = 0
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
8. ao = 0
1 ( ) 2.5T
f t dtT
=β« . a1 = a2 = 0 since function has odd symmetry
2
2
1 00 11
2 2 5b ( )sin 5sin cos 102 0 2
Tf t tdt tdt t
TΟ Ο Ο
Ο Ο= = = β = β
ββ« β«
2
2
2 00 11
2 2 5b ( )sin 2 5sin 2 cos 2 02 0 2
Tf t tdt tdt t
TΟ Ο Ο
Ο= = = β =
ββ« β«
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
9. ao = 2
2
0 00
1 1 2( ) 2 43 3 3
Tf t dt dt t
T= =β« β« = .
a1 =2
2
00 00
2 2β« β« 2 4 3( ) cos 2cos sin
3 3 3 2 3T
f t tdt t dt tT
Ο ΟΟΟ
β β β β β β= = ββ β β β β ββ β β β β β
2 0.551=
a2 =2
2
00 00
2 2β« β« 4 4 3( ) cos 2 2cos sin
3 3 3 4 3T
f t tdt t dt tT
Ο ΟΟΟ
β β β β β β= =β β β β β ββ β β β β β
4 0.276=
a3 =2
2
00 00
2 2β« β« 6 4 3( )cos3 2cos sin
3 3 3 6 3T
f t tdt t dt tT
Ο ΟΟΟ
β β β β β β= = =β β β β β ββ β β β β β
6 0
2
2
1 00 00
2 2 2 4 3 2( )sin 2sin cos3 3 3 2 3
Tf t tdt t dt t
TΟ ΟΟ
Οβ β β β β β= = = ββ β β β β ββ β β β β β β« β« 0.955= b
2
2
2 00 00
2 2 4 4 3 4( )sin 2 2sin cos3 3 3 4 3
Tf t tdt t dt t
TΟ ΟΟ
Οβ β β β β β= = = β =β β β β β ββ β β β β β β« β« 0.477 b
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
10. h(t) = β3 + 8 sin Οt + f(t) Use linearity and superposition. T = 2 s.
ao = 0
1 13 ( ) 3 2.52
Tf t dt
T= β + = ββ«β + .
a2 = 0
b1 = 2
00 0
2 2 2( )sin 8 (1)sin 8 7.362
Tf t tdt tdt
TΟ Ο8
Ο+ = + = β =β« β«
b2 = 2
00 1
2β« β« 2( )sin 2 (1)sin 2 0
2T
f t tdt tdtT
Ο Ο= =
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
11. (a) T 10 , F 0.1(2 4 2 2) 1.200av os a= = = Γ + Γ = (b)
2 22 2
0 0
222 2 3
000
1
(c)
F = βf (4 ) 0.2 (16 8 )5
1 80.2 16 4 0.2 32 163 3
= β +
β‘ β€ β β= β + = β + =β’ β₯ β ββ β β’ β₯β£ β¦
β« β«ef t dt t t dt
t t t 1.9322
2 2 2
30 0 0
2 2
200
2
2 22 (4 )cos3 0.4 4cos 0.6 0.4 cos 0.610 10
1 11.6 sin 0.6 0.4 cos 0.6 sin 0.60.6 0.36 0.6
8 10 4sin1.2 (cos1.2 1) sin 1.2 0.045813 9 3
= Γ β Γ = β
β β= β +β ββ β
= β β β = β
β« β« β«ta t dt t dt t t dt
tt t t
Ο Ο Ο
Ο Ο ΟΟ Ο Ο
Ο ΟΟ Ο Ο
Ο
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
12. (a) T = 8 β 2 = 6 s
(b) 1 Hz6of =
(c) 2 rad/so of 3Ο Ο Ο= =
(d) 1 (10 1 5 1) 2.5= 6oa = Γ + Γ
(e) 3 4
22 3
43
2 3
2
2 2 210sin 5sin6 3 3
1 30 2 15 2cos cos3 2 3 2 3
1 15 4 7.5 8 1 15 7.5cos 2 cos cos cos 2 (1.5) ( 1.5) 1.19373 3 3 3
β‘ β€= +β’ β₯
β£ β¦β‘ β€
= β ββ’ β₯β’ β₯β£ β¦β‘ β€β β β β β‘ β€β΄ = β β β β = β β β = ββ β β ββ’ β₯ β’ β₯β β β β β£ β¦β£ β¦
β« β«t tb dt dt
t t
b
Ο Ο
Ο ΟΟ Ο
Ο ΟΟ ΟΟ Ο Ο Ο
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
13.
433 4
3322 3
433 4
32 32 3
2 6 6 1 10 510cos 5cos sin sin6 6 6 3
10 1 1sin 3 sin 2 sin 4 sin 3 03 2 2
1 1 1010sin 5sin cos cos3 3
10 1cos3 cos 2 cos3 2
5
β‘ β€β‘ β€= + = ββ’ β₯β’ β₯
β’ β₯β£ β¦ β£ β¦β β= β + β =β ββ β
β‘ β€β‘ β€= + = β ββ’ β₯β’ β₯
β’ β₯β£ β¦ β£ β¦
= β β +
β« β«
β« β«
t ta dt dt t
b tdt t dt t t
Ο Ο Ο ΟΟ Ο
Ο Ο Ο
t
Ο
Ο Ο Ο ΟΟ Ο
Ο ΟΟ
Ο
2 23 3
1 104 cos3 ( 1)2 3
β ββ = β β =β ββ β
+ =a b
Ο ΟΟ
1.0610
1.0610
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
14.
(a) 2 23.8cos 80 1.9 1.9cos160 , T 12.5 ms, ave value 1.9160
ΟΟ = + Ο = = =
Οt t
(b)
(c) 23.8cos70 3.8sin80 ; , , T 2 ; ave value 0ΟΟ β Ο Ο = Ο Ο = Ο = = =
Οo ot t t t s
33.8cos 80 (3.8cos80 )(0.5 0.5cos 160 )1.9cos80 0.95cos 240 0.95cos80 2.85cos80 0.95cos 240
2T 25ms, ave value 80
Ο = Ο + Ο= Ο + Ο + Ο = Ο + Ο
Ο= =
Ο
t t tt t t t t
0=
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
15. T = 2 s (a)
( )
11
400
4 1
1 1
2 4 2 1sin cos 42 2 4
1 1 cos 44
max when 4 , 0.1252
Γ Ο= = β
ΟΟ
β΄ = β ΟΟ
ΟΟ = =
β«tt tb dt t
b t
t t s
(b) 41
4=
Οb
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
16.
( ) 5 8cos10 5cos15 3cos 20 8sin10 4sin15 2sin 20= + β + β β +g t t t t t t t
(a) 25 T 1.25665Ο
Ο = β΄ = =o s
(b) 5 104 3.183 Hz2
= Ξ² = = =Ο Οo of f
(c) G 5= βav
(d) 2 2 2 2 2 2 21G ( 5) (8 5 3 8 4 2 ) 116 10.7702
= β + + + + + + = =eff
(e)
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
17.
[ ]0.1 0.1
0.1 0.10.1
0.1
T 0.2, ( ) V cos5 , 0.1 0.1
2 V cos5 cos10 5V cos(5 10 ) cos(10 5 )0.2
1 15V sin(10 5 ) sin(10 5 )10 5 10 5
V 2 2sin(10 5 )0.1 sin(102 1 2 1
β β
β
= = Ο β < <
= Ο Ο = Ο + Ο + Ο β
β‘ β€= Ο + Ο + Ο β Οβ’ β₯Ο + Ο Ο β Οβ£ β¦
= Ο + Ο +Ο + β
β« β«
m
n m m
m
m
f t t t
a t n t dt n t n t dt
n t n tn n
nn n
Ο
2 2
5 )0.1
V 2 2sin( 0.5 ) sin( 0.5 )2 1 2 1
V 2V2 2 1 1cos ( cos ) cos2 1 2 1 2 1 2 1
2V 4V2 1 2 1 coscos4 1 4 1
1 1V cos5 5V sin sin0.2 5 2 2
β‘ β€Ο β Οβ’ β₯β£ β¦β‘ β€= Ο + Ο + Ο β Οβ’ β₯Ο + ββ£ β¦β‘ β€ β= Ο + β Ο = Ο ββ ββ’ β₯Ο + β Ο + ββ£ β¦ β
β β β Ο= Ο = β
Ο β Ο βΟ Οβ= Ο = β ββΟ β
m
m m
m m
o m m
n
n nn n
n n nn n n n
n n nnn n
a t dt
ββ
0.1
0.1
2V
β
β‘ β€β =ββ’ β₯ Οβ β£ β¦
+
β« m
2V 4V 4V 4V 4V( ) cos10 cos 20 cos30 cos 40 ...3 15 35 63
β΄ = + Ο β Ο + Ο β ΟΟ Ο Ο Ο Ο
m m m m mv t t t t t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
18.
(a) 1even, wave2
β
(b) 0 for all ; 0; 0= = =n even ob n a a (c) 1 2 3 2
22
11
1 3
0, 0
8 10 6 205cos sin sin sin12 6 3 6 3 6
20 20 20sin sin 2.330, sin sin 2.1223 6 3 2 3
= = = =
Ο Ο Ο Οβ β= = = ββ βΟ Ο β β Ο Ο Οβ β β ββ΄ = β = = Ο β = β = ββ β β βΟ Οβ β β β
β«n
b b
Ο
n t n t n na dtn n
b a
a a
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
19. (a) 0
( ) 0.2sin1000 0.6sin 2000 0.4sin 3000= =
β΄ = Ο + Ο +o na a
Οy t t t t (b) 2 2 2Y 0.5(0.2 0.6 0.4 ) 0.5(0.56) 0.5292= + + = =eff (c) (2ms) 0.2sin 0.2 0.6sin 0.4 0.4sin 0.6 1.0686= Ο + Ο + Ο =y
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
20. (a) (b) (c) (d) (e)
33
5 522
3
5 52
5 5
4 2 5 32 6 5 3.2 15 10[ ] 0, 8cos sin sin sin6 6 6 10 3 3
4 2 5 32 6 15 10 3.2[ ] 0, 8sin cos cos ( 0.5)6 6 6 10 3 3
8 2 5 64 12 15[ ] 0, 8cos sin12 12 12 10
Ο Ο Ο Οβ β= = = = β =β βΟ Ο β β
Ο β Ο Οβ ββ β= = = β = β ββ ββ βΟ Οβ β β β
Ο= = =
Ο
β«
β«
t ta b a dt
tb a b dt
tc b a dt
0.88213
0.5093=
3
23
5 52
10sin6 6
8 10 64 12 15 10[ ] 0, 8sin cos cos12 12 12 10 6 6
Ο Οβ ββ =β ββ β
Ο Οβ ββ= = = β ββ ββΟβ β β
β«
β«td a b dt
3.801
1.0186Ο β =ββ
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
21. T = 4 ms (a)
0.0040.004
00
1000 250 88sin125 cos1254 125
16 16cos 1 5.0932
Γ= Ο =
β Ο
Οβ β= β β = =β βΟ Οβ β
β«o Οdt ta t (b)
0.004
10
0.004 0.004
10 0
0.004
0
1
24000 sin125 cos0.004
4000 sin125 cos500 2000 (sin 625 sin 375 )
cos625 cos375 3.2 5.3332000 (1 cos 2.5 ) (1 cos1.5 ) 0.6791625 375
4000 sin125
Ο= Ο
β΄ = Ο Ο = Ο β Ο
Ο Οβ β= β + = β Ο β β Ο = ββ βΟ Ο Ο Οβ β
= Ο
β«
β« β«
ta t dt
a t t dt t t dt
t t
b
0.004 0.004
0 0
sin 500 2000 (cos375 cos 625 )
1 1 12000 (sin1.5 ) (sin 2.5 ) 2000375 625 375 625
Ο = Ο β Ο
ββ‘ β€ β β= Ο β Ο = = ββ ββ’ β₯Ο Ο Οβ£ β¦ β β
β« β«t t dt t t dt
1 2.716βΟ
(c) 4 0 : 8sin125β < < Οt t (d)
[ ]
( )
0.004
1 10
0.0040.004
100
40000, 8sin125 cos 2508
cos375 cos1252000 sin 375 sin125 2000375 125
5.333 161 cos1.5 cos 1 3.3952
+
= = Ο Ο
Ο Οβ‘ β€β΄ = Ο β Ο = β +β’ β₯Ο Οβ£ β¦
Οβ β= β Ο + β = ββ βΟ Ο β β
β«
β«
b a t t dt
t ta t t dt
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
22.
0.0010.001
0 0
1 3 5 7 9
1odd and wave 0, 0, 02
T 10 0.01
8 110sin 200 8000 cos 2000.01 200
40 40(cos 0.2 1) (1 cos 0.2 )
2.432, 5.556, 5.093, 2.381, 0.27
β β΄ = = =
= =
β‘ β€ ββ β= Ο =β’ β₯ β βΟβ β β£ β¦Ο
β΄ = β Ο β = β ΟΟ Ο
β΄
β«
o n even
odd
odd
a a b
ms s
b n t dt n tn
b n nn n
= = = = =b b b b b 02
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
23.
( )
( )
/ 4
00.001
0
2
60.0013
2 2 2 0
2 2
1 8odd and wave, T 8 ( )sin2 T
2 250 1000 1000 sin 250T
1Now, sin sin cos , 250
10( ) 10 sin 250 250 cos 250250
16 sin 04
β = β΄ = Ο
ΟΟ = = Ο β΄ = Ο
= β = Ο
= β΄ = Ο β Ο ΟΟ
Οβ΄ = β
Ο
β«
β«
β«
T
n o
o n
x
n
n
ms b f t n t dt
b t nt dt
x ax dx a ax ax a na
f t t b n t n t n tn
nbn 1 2
3 52 2
16cos 0 sin cos 0.24604 4 4 4 4
16 3 3 3 16 5 5 5sin cos 0.4275 ; sin cos 0.134219 4 4 4 25 4 4 4
0
β
Ο Ο Ο Ο Οβ β β ββ + β΄ = β =β β β βΟβ β β β Ο Ο Ο Ο Ο Οβ β β β= β = = β =β β β βΟ Οβ β β β
=even
n n b
b b
b
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
24. (a) odd, T = 4 (b) even, T = 4:
(c) 1odd, wave: T 82
β =
(d) 1even, wave, T 8 :2
β =
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
25. (a)
1,
2 2
2 2
20 1 2 20 205 sin sin 5 , V ( 1)0.4
V 20 5Z 4 5 2 4 10 , IZ (4 10 ) 1 2.5
5 1 2.5 12.5 5I1 6.25 (1 6.25 )
12.5 1 5 1cos5 sin 51 6.25 1 6.25
β Ο= + β΄ = = β
Ο Ο Ο Ο
β= + = + = = = β
Ο + +β +
β΄ = β = βΟ + Ο +
β΄ = β +Ο + Ο +
βs sn snodd
snn fn
n
fn
fn
ntv v ntn n n
j jj n j nn j n j
j j n jn n n n
i ntn n n
j
n
nt
21,
1 12.5 51.25 cos5 sin 51 6.25
β β‘ β€β΄ = + β +β’ β₯+ Ο Οβ£ β¦βfodd
i ntn n
(b) 2
21,
21,
22
1,
1 12.5Ae , , (0) 0, (0) 1.251 6.25
2 1 2(0) 1.25 1.25 tanh 0.2 0.553880.16 4 0.4
1 12.5 5A 0.55388, 0.55388 1.25 cos5 sin 51 6.25
ββ
β
ββ
β β= = + = = + ββ β+ Οβ β Ο
β΄ = β = β Ο =Ο + Ο Γ
β‘ β€β΄ = β = β + + β +β’ β₯+ Ο Οβ£ β¦
β
β
β
tn f n f
odd
fodd
t
odd
i i i i i in
in
i e nt nt
n n
nt
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
26. (a) 2 0.40 0.2 : 2.5(1 ) (0.2 ) 2.5(1 ) 1.78848 Aβ β Ο< < Ο = β β΄ Ο = β =tt i e i e (b) 2( 0.2 )0.2 0.4 : 1.78848 (0.4 ) 0.50902 Aβ β ΟΟ < < Ο = β΄ Ο =tt i e i (c) 2( 0.4 )0.4 0.6 : 2.5 (2.5 0.50902) , (0.6 ) 1.9335β β Ο βΟ < < Ο = β β Ο =tt i e i
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
27. (a)
( )
1,
2 2
2
20 15 sin 5
20 sin 5
20V
1 1 20 / 1 20 / 1 20Z 2 2 V5 2 10 2 1/ 10 10 1 20 1 20
20 1 20 20 1V , 20 cos5 sin 51 400 1 400
20 1 15 sin 51 400
β
= +Ο
=Ο
= βΟ
β Ο β Ο β= + = + β΄ = Γ = Γ
+ +β β
β
β΄ = Γ = β ++ Ο Ο +
β΄ = +Ο +
βsodd
sn
sn
n cn
cn cn
cf
v ntn
v ntn
jn
j n j n j n j n j n j n j n j n j n
n j v n nt ntn n n n
vn n1,
20cos5β β βββ β
β β βodd
nt nt (b) / 4Aeβ= t
nv (c)
2 2 21, 1,
2 21,
/ 42
1,
20 20 1 1(0) A 5 A 51 400 (1/ 20)
1 tanh 5 tanh 1.23117(1/ 20) 4(1/ 20) 20 2 40
1A 0 5 1.23117 4.60811
β β
β
β= + + = + β
Ο + Ο +
Ο Ο Ο= = Ο =
+ Γ
β΄ 20 1 1( ) 4.60811 5 sin 5 20cos5
1 400
ββ
= β + Γ = βΟ
β ββ΄ = β + + ββ βΟ + β β βt
codd
β β
β
codd odd
odd
n n
n
v t e nt ntn n
v
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
28. At the frequency Ο = 10nΟ
( )
( )3
3
10 10 10 5 10
20 10 5 10n
j n
j n
Ο
Ο
β
β
β‘ β€+ Γβ£ β¦= Ξ©+ Γ
Z and ( )8Sn j
nΟ= βI
Therefore ( )80 10 0.0520 0.05n
j njn j n
ΟΟ Ο
β‘ β€+= β β’ β₯+β£ β¦
V .
In the time domain, this becomes
( )2
o 1 11 2
1 ( )
1 (0.005 )40( ) cos 10 90 tan 0.005 tan 0.00251 (0.0025 )n odd
nv t n n n
n n
ΟΟΟ Ο Ο
Ο ΟΟ
ββ β
=
+β β= β +β ββ β +
β β
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
29. At the frequency Ο = nΟ
( ) ( )
( )1
223
10 32 and 120 5 10
n
Ln Sn Sn jjn nΟ Ο
β
β= = β
+ ΓI I I β
Thus, in the time domain, we can write
( )( )
( )( )
1o 12
2 21 (odd)
320 1( ) 1 cos 90 tan 0.00025n 20 1 0.00025
n
Ln
i t n t nn
Ο ΟΟ Ο
β ββ
=
β‘ β€= β β ββ’ β₯
β’ β₯ +β£ β¦β
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
30.
( )
30.001 0.0053
3 2 / 6 10 1003
0 0.003
0.001 0.00551000 1000
0 0.003
5 3
3 3
3
10 100 1006
10 1 16 1000 1000
100 1001 (1 1 1 1) 10.6106 6
10.610; 10.610
2
ββ Γ Ο Γ β Ο
β Ο β Ο
β Ο β Ο β Ο
β
β‘ β€= ββ’ β₯
β£ β¦β‘ β€β
= +β’ β₯Ο Οβ’ β₯β£ β¦
= + + β = + β + = βΟ Ο
β΄ = =
=
β« β«j t j t
j t j t
j j j
c e e
e ej j
e e e jj j
c j c
a
( )
0.001 0.0053
0 0.003
5
2 23 3 3 3 3 3 3
10 100cos100 100cos10006
2 10 1 sin 0 sin 5 sin 3 06 1000
1 1( ) 21.22 and 21.222 2
β‘ β€ΓΟ β Οβ’ β₯
β£ β¦Γ
= Ο β β Ο + Ο =Ο
= β = β β΄ = + =
β« β«t dt t dt
c a jb j b b a b
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
31. 0.001 0.002
5 400 400
0 0.001
0.001 0.002400 400
0 0.001
0.004000.001 40002 2
0.001
1T 5 10 1000.005
20,000 1000
120,000 ( 400 1)160 400
j nt j ntm
j nt j ntn
j ntj nt
n
ms c te dt e dt
c t e dt e dt
ec j nt en j n
β Ο β Ο
β Ο β Ο
β Οβ Ο
β‘ β€= = +β’ β₯
β£ β¦β‘ β€
β΄ = +β’ β₯β£ β¦
β΄ = Ο + +Ο β Ο
β« β«
β« β«
( )
2
3 3
0.4 0.8 0.41 2 2
2
1(50 10 100 10 ) 0.15 200 300.005
1 1 120,000 (1 0.4 )160 160 400
125 (1 72 ) (1.60597 51.488 ) 12.66515 15.91548 90 (1 144 1 72 )
12.665(1 72
o o
j j j
c a
c e j e ej
β β
β Ο β Ο β Ο
β‘ β€β’ β₯β’ β₯β£ β¦
β΄ = = Γ + Γ = Γ =
β‘ β€= + Ο β β ββ’ β₯Ο Ο Οβ£ β¦
= β β Β° β Β° β + β Β° β β Β° β β β Β°Ο
= β β
2
) (1 1.2566) 12.665 15.915(1 144 1 72 )20.339 20.513 12.665 18.709 108 24.93 88.613.16625 144 (1 2.5133) 3.16625 7.9575(1 288 1 144 )8.5645 75.697 3.16625 15.1361 144 13.309 1
j j
c j j
Β° + β + β β Β° β β β Β°= β β Β° β + β β Β° = β β Β°= β β Β° + β + β β Β° β β β Β°= β β Β° β + β Β° = β 77.43Β°
(a)
(b)
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
32. Fig. 17-8a: V 8 V, 0.2 , 6000o os f ppsΟ ΞΌ= = =
(a) 1 1T , 6000, 0.2 5 MHz6000 of s fΟ ΞΌ
Ο= = = β΄ = =
(b) 6000 Hzof = (c)
6 6
3
3
8 0.2 10 sin(1/ 2 3 12,000 0.2 10
(d) 6 6 6
7.270 mVΓ Γ=
Γ Γ3333 6
2 10 8 0.2 10 sin(1/ 2 333 12,000 0.2 10333.36 10 1/ 6000 1/ 2 333 12,000 0.2 10
c ΟΟ
β β
β
Γ Γ Γ Γ Γ= β΄ =
Γ Γ Γ
(e) 1/ 5 MHzΞ² Ο= = (f) (g)
6000 3 18,000 (closest) 1/ 6000 0.0036
c
c
ΟΟ
β βΓ Γ Γ Γ Γ ΓΓ = β΄ =
9.5998 mVβ΄ =
2000 22002 < < 2.2 Mrad/s kHz or 318.3 350.1 kHz2 2
6 kHz 6 53 318; 324,330,336,342,348kHz o
f f
f f n
ΟΟ Ο
β΄ < < < <
= β΄ = Γ = β΄ = 5
6 6
2278 0.2 10 sin(1/ 2 227 12,000 0.2 10 8.470 mV
1/ 6000 ( )227 6 1362 kHz
c
f
Οβ βΓ Γ Γ Γ Γ Γ= =
β²β²
= Γ =
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
33.
1 2 3T 5 ; 1, 0.2 0.2, 0.5 0.25, 1 2, 0, 4= = = β = + = β β =o nms c c j c j c j c n β₯ (a) (b)
1 1 1 2 2 3 32 1, 0.4 0.4 0.4, 1 0.5, 2( )
n n n o ojb c a c a jb jb j a jb j a jbv t t t t t t t
a1 0.4cos 400 cos800 2cos1200 0.4sin 400 0.5sin800 4sin1200Ο Ο Ο Ο Ο Ο
= β = β΄ = = β = β = β β = + β = ββ΄ = + + β + β +
(1 ) 1 0.4cos 72 cos144 2cos 216 0.4sin 72 0.5sin144 4sin 216s = + Β° + Β° β Β° + Β° β Β° + Β°v m β΄
(1 ) 0.332Vv msβ΄ = β
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
34. (a)
( )
( )
6
6
0.6 106
60.4 10
65
10T 5 2 1cos 25 5 10
5 104 10 sin 43.2 sin 28.82
n
n
ts c n dt
c n nn
n
ΞΌ Ο
Ο
β
β
Γ
βΓ
β
= β΄ = ΓΓ
Γ
(b) 41 (sin172.8 sin115.2 ) 0.06203
4c
Ο= Β° β Β° = β
(c) 6 6
6
0.2 10 0.2 10 0.085 10o oc a
β β
β
Γ + Γ= = =
Γ
(d) maxa little testing shows is max 0.08oc cβ΄ = (e)
(f) 6740 10740 148 MHz
5Γ
= = =ofΞ²
1 sin 43.2 sin 28.8nc nnΟ
β΄ = Γ Β° β Β°
β΄ = Β° β Β°
β«
( )
( )
3 310.01 0.08 0.8 10 sin 43.2 sin 28.8 0.8 10
125 sin 43.2 sin 28.8 1
β βΓ = Γ β΄ Β° β Β° β€ Γ
ok for 740
Β° β Β° β€
n nn
n nn
Ο
Ο>n
β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
35. T 1/16, 32oΟ Ο= = (a)
1/961/9696 96
30 0
3
16 4016 4096
20 40( 1) 4.244 V3 3
j t j
j
c e dt ej
c j e j
Ο Ο
Ο
Ο
j (b)
Ο Ο
β β
β
Γ= β
β
= β = β
β«
= ββ΄
3 3 3 3 3
23 3
642
Near harmonics are 2 32 Hz, 3 48 HzOnly 32 and 48 Hz pass filter 2
2 8.488 0, 8.488 V8.488 1I 1.4536 31.10 A; P 1.4536 5 5.283 W
5 0.01 96 2
1 640401/16 6
o o
n n n
j t
f fa jb c
a jb c j a b
j
c e dtj
Ο
Ο
β
= =β =
β = = β β΄ = =
= = β β Β° = Γ Γ =+ Γ
= =β
1/9664 /96
0
2 2 2
2
22
( 1) 2.7566 4.7746 V4
2 5.5132 9.5492 11.026 6011.026 60I 2.046 65.39 A5 0.01 641P 2.046 5 10.465 W P2
j
tot
e j
a b c j
j
Ο
Ο
Ο
β β = β
β = = β = β β Β°β β Β°
15.748 W
β΄ = = β β Β°+ Γ
= Γ Γ = β΄
β«
=β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
36. ( ) 5[ ( 3) ( 2) ( 2) ( 3)]f t u t u t u t u t= + + + β β β β (a)
-3 -2 -1 0 1 2 3
f(t)
t
β(b)
2 2 3
3 2 2
2 3 2 2 3 2
3 3 2 2 2 2
F( ) ( )
F( ) 5 10 5
5 10 5F( ) ( ) ( ) ( )
5 5 10( ) ( ) ( )
5 5( 2)sin 3 (
β Ο
ββ
ββ Ο β Ο β Ο
β β
Ο Ο β Ο Ο β Ο β Ο
Ο β Ο Ο β Ο Ο β Ο
Ο =
β΄ Ο = + +
β΄ Ο = β + β + ββ Ο β Ο β Ο
= β + + β + β +β Ο β Ο β Ο
= β Ο +β Ο β Ο
β«
β« β« β«
j t
j t j t j t
j j j j j j
j j j j j j
t e dt
j e dt e dt e dt
j e e e e e ej j j
e e e e e ej j j
jj j
j f
102)sin 2 ( 2)sin 2Ο + β Οβ Ο
10 10 20 10F( ) sin 3 sin 2 sin 2 (sin 3 sin 2 )β΄ Ο = Οβ Ο+ Ο = Ο+ ΟΟ Ο Ο Ο
j
j jj
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
37. (a) (b) (c)
0
( )
0
( ) ( ), 0 F( ) ( )
F( )
β ββ β β β
ββ
ββ +
= > β΄ = =
β1 1β΄ = =
β« β«at j t at j t
a j t
+ +
t e u t a j f t e dt e e dt
j ea j a j
Ο Ο
Ο
Ο
ΟΟ Ο
f
6 ( )
( )( )
( ) ( ), 0 F( )
1 1F( )
ββ β +
ββ + ββ +
= β > β΄ =
β β β‘ β€ 1β΄ = = β =β£ β¦+ + +
o j t
β«o
o
o o o
o
at atat a j to
t
at at a j ta j t
t
e e u t t a j e e dt
j e e e e ea j a j a j
Οf t
Ο ΟΟ
Ο
ΟΟ Ο Ο
[ ]
( )
0( )
2 20 2
( ), 0 F( )
F( ) ( ) 1 0 [ 1]( ) ( )
ββ β +
β +β
= > β΄ =( )
1 1( )
β΄ = β + β = β+ + +
β«at a j t
a j t
t te u t a j te dt
ej a j ta j a j a j
Ο
Ο
Ο
Ο Ο β =Ο Ο
f
Ο
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
38.
0 4
4 00
14
4 4
10 0
4 0 : ( ) 2.5( 4); 0 4 : ( ) 2.5(4 )
F( ) 2.5( 4) 2.5(4 5)
ln 1 , let I 2.5(4 ) ( )
I 2.5(4 ) F( ) 2.5 (4 )( )
F( ) 5 (4 )cos 20
β Ο β Ο
β
ΟΟ
ΟΟ Ο β Ο
β < < = + < < = β
β΄ Ο = + + β
= Ο β΄ = β Ο β Ο
β΄ = β Ο Ο β΄ Ο = β +
β΄ Ο = β Ο = Γ
β« β«
β«
β« β«
j t j t
st j
j j t j
t f t t t f t t
j t e dt e dt
t e d
e d j t e e dt
j t t dt
t
44 4
0 00
402
2 2 2
2sin 210Γ Οβ β= β βΟ Οβ β 2
2
1 sin 5 cos
20 5F( ) sin 4 (cos sin )
20 5 5 5sin 4 (cos 4 1) 4 sin 4 (1 cos 4 )
2 5or, F( ) sin 2
Ο β ΟΟ
β΄ Ο = Οβ Ο + Ο ΟΟ Ο
= Ο β Ο β β Ο Ο = β ΟΟ Ο Ο Ο
Ο = Ο
β« β«t t dt
j t t t
j
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
39.
(1 ) (1 )
(1 ) (1 ) (1 ) (1 )
( ) 5sin F( ) 5sin
5F( ) ( )2
5 [ ]2
5 1 1F( ) ( ) ( )2 (1 ) (1 )2.5 2.5( ) (
1 1
Οβ Ο
βΟ
Οβ β Ο
βΟ
ΟβΟ β +Ο
βΟ
Ο βΟ β Ο βΟ β Ο +Ο Ο +Ο
β ΟΟ ΟΟ
= β Ο < < Ο β΄ Ο =
β΄ Ο = β
= β
β‘ β€Ο = β β ββ’ β₯β Ο β + Οβ£ β¦
β= β + β
β Ο + Ο
β«
β«
β«
j t
jt jt j t
jt jt
j j j j
j j
f t t t j t e dt
j e e e dtj
e e dtj
j e e e ej j j
e e
2 2 2
)
2.5 2.5 1 1( 2sin ) ( 2sin ) 5sin1 1 1
,
1
1
β β βββ β+ Οβ β
j 1 1 10sin 10sin5sin ( 1)1 1
β ΟΟ ΟΟβ +
= ΟΟ β ΟΟ = ΟΟ ββ Ο + Ο β Ο
+ Ο + β Ο ΟΟ ΟΟβ β= ΟΟ β = β =β ββ Ο β Ο Ο ββ β
j je e
j j j
j j
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
40.
/ 2/ 2
/ 2 / 2
/ 2 / 2/ 2
(1 ) (1 )
/ 2
/ 2
/ 2
/ 2
( ) 8cos [ ( 0.5 ) ( 0.5 )]
F( ) 8cos 4 ( )
4
1 14(1 ) (1 )
14 ( )(1 )
Οβ Ο
Ο Οβ Ο β β Ο
βΟ βΟ
ΟβΟ β +Ο
βΟ
Οβ Ο β β Ο
βΟ
β ΟΟ
= + Ο β β Ο
β΄ Ο = = +
β‘ β€= +β£ β¦
β§ β«βͺ βͺ= ββ¨ β¬β Ο + Οβͺ βͺβ© β
= β ββ Ο
β« β«
β«
j t jt jt j t
jt jt
j tjt jt j t
j
f t t u t u t
j te dt e e e dt
e e dt
e e e ej j
je j ej
/ 2 / 2 / 2
2 2
1(1 )
1 1 14 2cos 2cos 8cos1 2 1 2 2 1 1
2 cos / 28cos 162 1 1
ΟΟ β ΟΟ ΟΟβ§ β«β‘ β€ β‘β β ββ¨ β¬β£ β¦ β£+ Οβ© βΟΟ ΟΟ ΟΟβ§ β« β= Γ + Γ = +β¨ β¬ β ββ Ο + Ο β Ο + Οβ© β β
ΟΟ ΟΟ= =
β Ο β Ο
j jje jej
1
β€β¦
ββ
j
Ο = β΄ j
(a) 0 F( 0) 16=
(b) 16cos 720.8, F( 0.8)0.36
Β°Ο = =j 13.734=
(c) 16cos(3.1 90 )3.1, F( 3.1) Γ 0.29071 3.12
Β°Ο = =
βj = β
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
41.
[ ]
( )22
2 2
2 2
1(a) (b) (c)
F( ) 4 ( 2) ( 2) ( ) F( )2
4 2 1 2( )22 4 5( ) 2sin 2 sin 2 (0.8) sin1.6
2
βΟ
ββ
Ο Ο β
β β
Ο = Ο+ β Ο Οβ β΄ = Ο ΟΟ
1.5909
β΄ = Ο = = βΟ Ο Ο
= = β΄ =Ο Ο Ο
β«
β«
j t
j t j t j t j t
rad
f t e j d
f t e d e e ejt j t
f t j t t ft t
=
j u
β΄
2 2
0(2 ) ( 2 )
0
2
2
4F( j e) 4 ( )2
2 2( )
2 1 1 2 1 1 2 4(1 0) (0 1)2 2 2 2 48 8( ) (0.8)
(4 ) 4.64
ββ Ο β Ο + Ο
ββ
β+ Ο β + Ο
ββ
Ο = β΄ = ΟΟ
β΄ = Ο + ΟΟ Ο
β‘ β€ β β= β + β = + =β ββ’ β₯Ο + β + Ο + β Ο +β£ β¦ β β
β΄ = β΄ =Ο + ΟΓ
β«
β« β«
j t
jt j t
f t e d
f t e d e d
0.5488=
jt jt jt jt t
f t ft
[ ]
( )
( )
0.5 0.5
0.5 0.50.5
( ) ( 0.5 0.5 )
0.5
0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
F( j u) 4cos ( 0.5) ( 0.5)
4 2 1( ) cos2 2
1
1 1 1( ) ( )
Ο ΟΟ β ΟΟ Ο
β β
Ο+ Ο β Οβ Ο
β
Ο+ β Οβ β Ο+ Οβ
Ο = ΟΟ Ο+ β Ο β
β΄ = ΟΟΓ Ο = + ΟΟ Ο
β‘ β€= + Οβ£ β¦Ο
= β + βΟ Ο + βΟ +
β« β«
β«
j t j j j t
j jt j j t
j j t j j t j j t j j
u
f t e d e e e d
e e d
e e e ej t j t ( )
( ) ( )0.5 0.5 0.5 0.5
2 2 2 2
1 1 1( ) ( )
1 1 1 2cos 0.5 1 12cos 0.5 2cos0.5
2 42cos 0.5 cos 0.5 (0.8)
β β
β‘ β€β’ β₯β£ β¦β‘ β€
= + + β ββ’ β₯Ο Ο + βΟ +β£ β¦β‘ β€ β β= β = ββ ββ’ β₯Ο Ο + βΟ + Ο Ο + βΟ +β£ β¦ β β
ββ β= = =β ββ Ο Ο ββ β
t
j t j t j t j tje je je jej t j t
tt tt t t t
t tt t
0.3992β΄ f
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
42. 1.5( ) 20 ( 2) V= β βtv t e u t (a)
21.5 1.5
2(1.5 ) 3 2 3
F j e( ) 20 ( 2) 20
20 20 20F ( 0)1.5 1.5 1.5
β ββ Ο β Ο
ββ ββ
ββ Ο β + Ο β
ββ
Ο = β β =
= = β΄ =β Ο β Ο
β« β«t j t t j tv
j t jv
u t e dt e dt
e e j ej j
0.6638=
3 2
3 4
20(b) F ( ) A ( ) B ( )
1.520F ( 2) 0.39830 282.31 0.08494 0.38913
1.5 2A (2)
β Ο
β
Ο = Ο + Ο =β Ο
β΄ = = β Β° = ββ
0.08494β΄ =
jv v v
jv
v
j e ej
j e e jj
(c) B (2) 0.3891= βv
(d) F ( 2) 0.3983=v j (e) Οv(j2) = 282.3o or -77.69o
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
43. [ ]I( ) 3cos10 ( 0.05 ) ( 0.05 )Ο = Ο Ο + Ο β Ο β Οj u u 0.05
2 2
0.05/ 20/ 20
/ 20/ 20
1 2(a) W 4 I( ) 9cos 102
18 1 1 9 9 1cos 20 0.1 sin 202 2 20
β Ο
ββ β Ο
ΟΟ
βΟβΟ
= Γ Ο Ο = Ο ΟΟ Ο
β β= + Ο Ο = Γ Ο +β βΟ Ο Οβ β
β« β«
β«
j d d
d
0.9 JΟ = (b)
9 9 1(1 cos 20 ) 0.45 2 2sin 2020
0.05 2 0.1sin 20
Ο
βΟ
β‘ β€+ Ο Ο = = Ο + Γ Οβ’ β₯Ο Ο
, 0.04159 rad/sβ£
Ο = Ο + Ο
β«x
x
Ο =
xβ¦
x
x x
d
xβ΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
44. 4( ) 10 ( )β= tf t te u t (a) 8
2 2 8 21
0 0 0
β
(b)
(c) ( )22
2
16100 )(+
=Ο
ΟjF
mJ/Hz 90.63 )( 2
0=
=ΟΟjF , mJ/Hz 7.669 )( 2
4=
=ΟΟjF
W ( ) 100 100 (64 16 2)( 512)
100 2512
0.3906 J
β β ββ
Ξ© = = = Γ + +β
= Γ
β« β«t
t ef t dt t e dt t t
=
(4 )4 (4 )
20 0
2 2
10F( )16
Ο =Ο +
j
10F( ) {10 ( )} 10 [ (4 ) 1(4 )
10(4 )
ββ β + Οβ β + ΟΟ = = = β + Ο β
+ Ο
= β΄+ Ο
β«j t
t j t ej te u t t e dt j tj
j
F
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
45. 2( ) 8 Vβ= tv t e
(a) 2 41
0
W ( ) 2 64 32 Jβ β
βΞ©
ββ
= = Γ =β« β« tv t dt e dt
(b) 2
0(2 ) (2 )
00
(2 ) (2 )2
0
(c)
F ( ) ( ) 8
F ( ) 8 8
8 8 82 2 2
β βββ Ο β Ο
ββ ββ
ββ Ο β + Ο
ββ
ββ Ο β + Ο
ββ
Ο = =
8 32 F ( )2 4
β΄ Ο = +
= β = + Οβ Ο + Ο β Ο + Ο
β« β«
β« β«
tj t j tv
j t j tv
j t j t
j e v t dt e e dt
j e dt e dt
e e jj j j
= =+ Ο vj
1
1
2 21 1
2 2 21
11 1 1 12 21 1
11 112
1
1 32 32 10.9 32 tan2 ( 4) 2 8( 4) 16 2
16 1 2 20.9 2 tan8( 4) 16 2 4 2
20.45 tan s (by SOLVE)4 2
Οβ
βΟ
β
β
β‘ β€Ο ΟΓ = Ο = +β’ β₯Ο Ο + Ο Ο +β£ β¦
β‘ β€ β‘ β€Ο Ο Ο Ο
2.7174 rad/
β΄ = Γ + = +β’ β₯ β’ β₯Ο Ο + Ο Ο +β£ β¦ β£ β¦Ο Ο
Ο = +Ο +
β« d
β΄Ο =β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
46. (a) Prove: { ( )} { ( )} ( ) Let
{ ( )} ( ) { ( )}
ββ Ο β Ο
ββ
ββ Ο β Οβ ΟΟ
ββ
β = = β β = Ο
β΄ β = Ο =
β«
β«
o
o o
j t j to o
j t j tjo
f t t e f t f t t e dt t t
f t t f e e dt e f t
F F
F F
o (b)
(c) (d) Prove: { ( )} F( ) Let 1 in (c) aboveβ = β Ο =f t j kF (e)
Prove: { ( )} { ( )} Let , ,
, { ( )} ( ) ( )
We assume ( ) 0 { ( )} { ( )}
ββ Ο β Ο β Ο
ββ
βββ Ο β Ο
ββββ
= Ο = = = β Ο
= = β΄ = + Ο
Β±β = β΄ = Ο
β«
β«
j t j t j t
j t j t
dff t j f t e dt u e du j edt
dv df v f f t f t e j f t e dt
f f t j f t
F F
F
F F
/
1Prove: { ( )} F ( ) Let , 0
1 1{ ( )} ( ) F
1If 0, limits are interchanged and we get: F
1{ ( )} F
ββ Ο
ββ
ββ ΟΟ
ββ
Οβ β= = Ο = >β ββ β
Οβ ββ΄ = Ο Ο = β ββ β
Οβ β< β β ββ β
Οβ ββ΄ = β ββ β
β«
β«
j t
j k
jf kt f kt e dt kt kk k
jf kt f e dk k k
jkk k
jf ktk k
F
F
F
rove: { ( )} F( ) Now, F( ) ( )
dF( ) ( )( ) { ( )} { ( )} ( )}
ββ Ο
ββ
ββ Ο
ββ
= Ο Ο =Ο
Ο= β = β β΄ = Ο
Ο
β«
β«
j t
j t
dtf t j j j f t e dtd
j
P
f t jt e dt j tf t tf f j f td
F
F F Fβ΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
47. (a) (b) ( ) 4[sgn( 1) ( )] {4sgn( 1) ( )} { 4 ( )} 4= β Ξ΄ β΄ β Ξ΄ = β Ξ΄ =f t t t t tF F β
f ( ) 4[sgn( ) ( 1)] {4[sgn( ) ( 1)] {4sgn(1) ( 1)} {4 ( 1)} 4 β Ο= Ξ΄ β β΄ Ξ΄ β = Ξ΄ β = Ξ΄ β = j
(c) (10 30 ) (10 30 )
30 10 30 10 / 6 / 6
/ 6 / 6
4( ) 4sin(10 30 ) {4sin(10 30 )2
{ 2 2 } 2 2 ( 10) 2 2 ( 10)4 [ ( 10) ( 10)]
β Β° β β Β°
β Β° Β° β β Ο Ο
β Ο Ο
β§ β«β‘ β€= β Β° β΄ β Β° = β =β¨ β¬β£ β¦β© ββ + = β ΟΞ΄ Ο β + ΟΞ΄ Ο+
= β Ο Ξ΄ Οβ β Ξ΄ Ο+
j t j t
j j t j j t j j
j j
f t t t e ej
j e e j e e j e j e
F F
F
j e e
t t t t t t t eF F F
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
48. (a) ( ) A cos( ) F( ) {A cos cos A sin sin }
A cos { [ ( ) ( )]} Asin [ ( ) ( )]
A{cos [ ( ) ( )] sin [ ( ) ( )]}
F( ) A[ ( ) ( )]Ο β Ο
= Ο + Ο β΄ Ο = Ο Ο β Ο Ο =
β§ β«ΟΟ Ο Ξ΄ Ο + Ο + Ξ΄ Ο β Ο β Ο Ξ΄ Ο β Ο β Ξ΄ Ο + Ο =β¨ β¬
β© βΟ Ο Ξ΄ Ο + Ο + Ξ΄ Ο β Ο + Ο Ξ΄ Ο β Ο β Ξ΄ Ο + Ο
β΄ Ο = Ο Ξ΄ Ο β Ο + Ξ΄ Ο + Ο
o o
o o o o
o o o oj j
o o
ot j t t
jj
Ff t
j e e (b) 2
2
2 1( ) 3sgn( 2) 2 ( ) ( 1) F( ) 3 2 ( )
6 1F( ) 2 ( )
β Ο β Ο
β Ο β Ο
β‘ β€= β β Ξ΄ β β β΄ Ο = Γ Γ β β ΟΞ΄ Ο +β’ β₯Ο Οβ£ β¦
β‘ β€β΄ Ο = β β β ΟΞ΄ Ο ββ’ β₯Ο Οβ£ β¦
j j
j j
f t t t u t j e ej
(c)
j
j j e e j
2 2 2 2
1( ) sinh ( ) F( ) [ ] ( )2
1 1 1 1F( )2 2 2( )
ββ§ β«= β΄ Ο = ββ¨ β¬β© β
+ Ο+ β Ο ββ΄ Ο = β = =
β + Ο + Ο β β Ο Ο +
kt ktkt u t j e e u tFf t
k j k j kjk j k j k k
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
49.
113
3 3
1(a) F( ) 3 ( 3) 3 ( 1) ( ) [3 ( 3) 3 ( 1)]2
3 3 1 3( ) ( )2 2 2
3(5) (1 5 1 1510
βΟ
ββ
Ο Ο + β
β β
Ο = Ο+ β Οβ β΄ = Ο + β Ο β ΟΟ
(b) so f(5) = 0.1039β 73.52o
(c)
) 0.10390 106.48
β΄ = = = βΟ Ο Ο
= β β β β βΟ
β«
β«
j t
j t j t jt j t
rad rad = β β Β°
j u u f t u u e d
f t e dt e e ejt j t
f jβ΄
3
F( ) 3 ( 3 ) 3 ( 1)F( ) 3 F ( )
3( ) 3 ( ) ( ) (5) 0 0.10390 106.482
β
Ο = β β Ο + Οβ ββ΄ Ο = β Ο
= Ξ΄ β β β΄ = β β β Β°Ο
a
jt j t
uj j
f t t e e fj t
j u
3
2 1F( ) 2 ( ) 3 ( 3 ) 3 ( 1) Now, {2 ( )}2
1 3 1( ) ( ) (5) 0.10390 106.482
β
Ο = Ξ΄ Ο + β β Ο + Ο β Ξ΄ Ο = =Ο Ο
β‘ β€0.3618 15.985+= + β β β΄ = β β β Β°β’ β₯Ο Ο Οβ£ β¦
jt j t
j u u
f t e e fj t
F
= β Β°β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
50. 3 3(a) jF( ) 3 3 ( 1)
1Ο = + + + Ξ΄ Ο β
+ Ο Ο 1.5( ) 3 ( ) 1.5sgn( ) 3 ( )ββ΄ = + + Ξ΄ +
Οt jt
j j
f t e u t t t e 1 sin 8 / 2(b)
(c) 32 2 2
6(3 ) 6(3 )F( ) ( ) 3 cos 2 ( )(3 ) 4 (3 ) 2
β+ Ο + ΟΟ = = β΄ =
+ Ο + + Ο +tj jj f t t u t
j j
F( ) 5sin 4 8 2.58 / 2Ο
Ο = Ο = ΓΟ Ο
j
( ) 2.5[ ( 4) ( 4)]β΄ = + β βf t u t u t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
51.
1/ 2
11
/ 22 2
1
/ 2 / 22 2 2 2
/ 2 / 22 2
T 4, periodic; find exp l form
1 104
12.5/ 2 / 4
1 1 1 12.52 / 4 / 2 / 4
1 42.5 ( ) (/ 2
β Ο
β
β Ο
β
β Ο Ο
β Ο Ο
β²=
β΄ =
β‘ β€β ββ΄ = ββ’ β₯β ββ Ο β Οβ β β£ β¦
β‘ β€β β β ββ΄ = + β +β’ β₯β β β ββ Ο Ο Ο Οβ β β β β£ β¦
= β β +Ο Ο
β« jn tn
jn tn
jn jnn
jn jn
c te dt
tc ejn n
c e ejn n jn n
e ejn n
/ 2 / 2
2 2
/ 22 2
2 2
)
5 102cos 2sin2 2
10 20( ) cos sin2 2
10 20F( ) cos sin 22 2 2
β Ο Ο
βΟ
ββ
β
ββ
β‘ β€ββ’ β₯
β£ β¦Ο Οβ β= Γ + ββ βΟ Ο β β
Ο Οβ‘ β€β΄ = ββ’ β₯Ο Οβ£ β¦Ο Ο Οβ‘ β€ β β
β β
β
jn jn
jn t
e e
j n njn n
j n nf t j en n
β΄ Ο = β ΟΞ΄ Οββ ββ’ β₯Ο Οβ£ β¦β j n n nj j
n n
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
53. 1F( ) 20 ( 20 )! 1
1 1 1 1 120 ( ) ( 20) ( 20) ( 40) ( 40)1 1 1 1 1 1 2 1 3
1 1( 60) ( 60) ...7 7
20 2010 ( ) [ ( 20) ( 20)] [ ( 40) ( 40)]2 3
20 20[ ( 60) ( 60) [ (7 25
β
ββ
Ο = Ξ΄ Οβ+
β‘= Ξ΄ Ο + Ξ΄ Ο + + Ξ΄ Οβ + Ξ΄ Ο + + Ξ΄ Οββ’ + + + +β£β€+ Ξ΄ Ο+ + Ξ΄ Οβ + β₯β¦
= Ξ΄ Ο + ΟΞ΄ Ο+ + ΟΞ΄ Οβ + ΟΞ΄ Ο+ + ΟΞ΄ Ο β +Ο Ο
ΟΞ΄ Ο + + ΟΞ΄ Οβ + ΟΞ΄Ο Ο
βj nn
80) ( 80)] ...
10 20 20 20 20( ) cos 20 cos 40 cos 60 cos80 ...2 2 3 7 2520 1 1 1 10.25 cos 20 cos 40 cos 60 cos80 ...
2 3 7 2520 1 1 1 1(0.05) 0.25 cos1 cos 2 cos3 cos 4 ... 1.3858
2 3 7 25
Ο + + ΟΞ΄ Ο β +
β΄ = + + + + +Ο Ο Ο Ο Ο
β‘= + + + + +β’Ο β£β‘ β€β΄ = + + + + + =β’ β₯Ο β£ β¦
rad
f t t t t t
t t t t
f
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
54. Input ( ) 5[ ( ) ( 1)] ( ) ( ) ( )t
x t u t u t y t x z h t z dββ
= = β β = ββ« z
u t
(a) (b) h t( ) 2 ( )h t u t= ( ) 2 ( 1)β u t= β (c) h t ( ) 2 ( 2)= x(t β z)
zt-1 t h( z)
z
2
y(t)
t
10
32
t < 0: y(t) = 0 1: ( ) 0t y t< = 2 : ( ) 0t y t< = 0 t< <1: 2 : 1 t< < 2 3t :< <
0
( ) 10 10= =β«t
y t dz t β« ==t
tdzty1
1) - 10( 10 )( β« ==t
tdzty2
2) - 10( 10 )(
t > 1: t > 2: t > 3:
β« ==t
t
dzty1-
10 10 )( β« ==t
t
dzty1-
10 10 )( β« ==t
t
dzty1-
10 10 )(
5
x(t β z)
z t-1 t
x(t β z)
zt-1 t h( z)
z
2
h( z)
z
2
1 2
y(t)
t
10
1
y(t)
t
10
1 2
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
55. ( ) 5[ ( ) ( 2)]; ( ) 2[ ( 1) ( 2)]x t u t u t h t u t u t= β β = β β β
1
0
2
2
( ) ( ) ( )
1: ( ) 0
1 2 : ( ) 10 10( 1)
2 3: ( ) 10
3 4 : ( ) 10 10(2 2) 10(4 )
4 : ( ) 0( 0.4) 0; (0.4) 0; (1.4) 4
(2.4) 10; (3.4) 6; (4.4) 0
ββ
β
β
= β
< =
< < = = β
< < =
< < = = β + = β
> =β΄ β = = =
= = =
β«
β«
β«
t
t
t
y t x z h t z dz
t y t
t y t dz t
t y t
t y t dz t
t y ty y y
y y y
t
t
orβ¦. same answers as above
0
1
2
2
( ) ( ) ( )
1: ( ) 0
1 2 : ( ) 10 10( 1)
2 3: ( ) 10
3 4 : ( ) 10 10(2 2) 10(4 )
4 : ( ) 0
β
β
= β
< =
< < = = β
< < =
< < = = β + = β
> =
β«
β«
β«
t
t
y t x t z h z dz
t y t
t y t dz t
t y t
t y t dz t
t y t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
56.
2
( ) 2( )
0
2 20
02 2
2 2
( ) 3[ ], ( ) ( )
( ) ( ) ( )
3[ ]
13 [ ] 32
3 ( 1) 1.5 ( 1)( ) 3(1 ) 1.5(1 ) 1.5 3 1.5 , 0
β β
ββ
β β β β
β β
β β
β β β β
= β =
= β
= β
β‘ β€= β β’ β₯β£ β¦= β β β
β΄ = β β β = β + >
β«
β«
t t
t
tt z t z
tt z t t Z
t t t t
t t t t
h t e e x t u t
y t x z h t z dz
e e dz
e e e e
e e e ey t e e e e t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
57.
0
( ) ( 2) ( )
2( ) (5 ), 2 53
β
= β
= β < <
β«y t x t h z dz
h t t t
(a)
5 5
2 2
2 20( ) 10 (5 ) (5 )3 3
Note: ( ) is in window for 4 6
= Γ β = β
< <
β« β« (b)
y t z dz
h z t
z dz
52
2
20 1( ) (5 )3 210 (0 9) 30 at 53
zβ β= β ββ ββ β
= β β t= =
y t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
58. ( 2)
0
( ) 5 ( 2), ( ) (4 16) [ ( 4) ( 7)], ( ) ( ) ( )β
β β= β = β β β β = ββ«tx t e u t h t t u t u t y t x t z h z dz
=
(a) 6 : ( ) 0 (5) 0t y t y< = β΄ (b)
6(8 2)
46 6
6 6
4 46
6 6 6 4
46 6 4 2 2
2
8 : (8) 5 (4 16)
(8) 20 80
20 ( 1) 80 ( )1
20 (5 3 ) 80 80 20 80 6020(1 ) 22.71
β β β
β β
β β
β β
β
= = β
2β β
β΄ = β
β‘ β€= β β ββ’ β₯
β£ β¦= β β + = + β
= + =
β«
β« β«
z
z z
z
t y (c)
e z dz
y e z e dz e e dz
ee z e e e
e e e e e ee
7 4
7(10 2)
47
8
47 7
8 8 8 7 84
4 48 7 4 1 4 1 4
10 : (10) 5 (4 16)
(10) 20 ( 4)
(10) 20 80 20 [ ( 1)] 80 ( )
20 (6 3 ) 80( ) 40 20 15.081
β β β
β
β β β β
β β β β β
= = β
β΄ = β
β΄ = β = β β
= β β β = + =
β«
β«
β« β«
z
z
z z z β
e z dz
y e e z dz
t y
y e ze dz e e dz e e z e e e
e e e e e e e
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
59.
0
0 0
0
( ) sin , 0 ; 0 elsewhere, Let ( ) ( )
( ) ( ) ( )
0 : ( ) 0
0 : ( ) sin sin
1( ) (sin cos )2
1 [ (sin cos ) 1]21 (sin cos )2
β
β
β + β
β
β
β
= < < Ο =
= β
< =
< < Ο = Γ =
β‘ β€β΄ = ββ’ β₯β£ β¦
= β +
= β +
β«
β« β«
t
t tt z t z
tt z
t t
t
h t t t x t e u t
y t x t z h z dz
t y t
t y t z e dz e e z d
y t e e z z
e e t t
t t e
z
y
y
(a) (1) 0.3345+= (b) (2.5) 0.7409= (c)
0
0
: ( ) sin
1 1: ( ) (sin cos ) ( 1) 12.0702 2
(4) 0.2211
Οβ
Οβ β Ο
> Ο =
β‘ β€> Ο = β = + =β’ β₯β£ β¦β
β΄ =
β«t z
t z t t
t e e z dz
y y t e e z z e e e
y
y y
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
60.
0
1
21
2
2
2 3
( ) 0.8( 1)[ ( 1) ( 3)],( ) 0.2 ( 2)[ ( 2) ( 3)]
( ) ( ) ( ) ,
3 : ( ) 0
3 4 : ( ) 0.8( 1)0.2( 2)
( ) 0.16 ( 2 2 2)
1 10.16 [ ( 1) 2 2 ] 0.16 ( 1)3 2
β
β
β
= β β β β= β β β β
= β
< =
< < = β β β
β΄ = β β + β +
= β + + + β = β + +
β«
β«
β«
t
t
x t t u t u th t t u t u t
y t x t z h z dz
t y t
t y t t z z dz
y t tz t z z z dz
z t z t dz z t11
2
22
3 2
3 2 2 2
3 2
(2 2 )
1 8 1 10.16 ( 1) ( 1) ( 1) ( 1) 4 (2 2 ) ( 1 2)3 3 2 21 1 8 1( ) 0.16 ( 1) ( 1) 2 2 2 6 2 63 3 3 2
1 1 1 10.16 1 2 1 6 3 86 2 2 2
ββ β‘ β€+ ββ’ β₯β£ β¦
β‘ β€= β β + + + β β + + β β ββ’ β₯β£ β¦β‘ β€β΄ = β + β + + + β β β β + β β +β’ β₯β£ β¦β‘ β€β β β β= + β β + β β + + + ββ β β ββ’ β₯β β β β β£ β¦
β«tt
z t z
t t t t t t
y t t t t t t t t t t
t t t 3 21 3 9 90.166 2 2 2
β β= β +β ββ β
βt
t t
(b)
(a)
3(4.8) 90.67 10y ββ΄ = Γ
3
333 2
22
(3.8) 13.653 10
1 14 5 : ( ) 0.16( 1) ( 2) 0.16 ( 1) (2 2 )3 2
1 1( ) 0.16 (27 8) ( 1)5 (2 2 )13 219 110.16 2.5 2.5 2 2 0.16 0.53 6
ββ΄ = Γ
β‘ β€< < = β β β = β + + + ββ’ β₯β£ β¦
β‘ β€= β β + + + ββ’ β₯β£ β¦β‘ β€ β β= β + + + β = ββ ββ’ β₯β£ β¦ β β
β«t y t t z z dz z t z t z
y t t t
t t t
y
β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
61. 2 2
0
2( ) 2
0
2 2
02
( ) 10 ( ), ( ) 10 ( )
( ) ( ) ( )
( ) 10 10
100 100
( ) 100 ( )
β β
β
β β β
β β
β
= =
= β
β΄ =
= = Γ
β«
β«
β«
t t
tt z z
tt t
x
β΄ = t
t e u t h t e u t
y t x t z h z dz
y t e e dz
e dz e t
y t t e u t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
62. 4( ) 5 ( )th t e u tβ= (a)
0.88 0.8 6.4
10.1
25W 25 ( ) 1.3990 J8
25% 1.3990 / 100%8
β β βΞ© = = β =
β β
44.77%= Γβ β
β β
β« te dt e e
= (b)
β΄
221
1 200
11
5 1 25 25 1H( ) W tan4 16 4 4
25 1 0.9224W tan 0.9224 J % 100%4 2 25 / 8
βΞ©
βΞ©
ΟΟ = β΄ = Ο =
Ο + Ο Ο + Ο
29.52%= = β΄ = ΓΟ
β«j
=
j d
β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
63.
22 2 2F( ) ( ) (2 2 ) ( )(1 )(2 ) 1 2
β βΟ = = β β΄ = β+ Ο + Ο + Ο + Ο
t tj f t e e u tj j j j
(a) 2 3 41
0
4 8 4 1W (4 8 4 )2 3 4
Jβ
β β βΞ© = β + = ββ« t t te e e dt
e e e e tf e e
β β β
β β Γ
= β + = β + = = =
3+ =
(b) f t 2
0.69315 2 0.69315max
( ) 2 4 0, 2 4 0, 2, 0.693152( ) 0.5
t t t t
=
β΄ = β
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
64.
2 3
1 1/ 6 1/ 2(a)
1/ 3)(2 )(3 ) 2 3
Ο = = β +Ο + Ο + Ο Ο + Ο + Ο
jF(j
1 1 1( ) sgn( ) ( ) ( )12 2 3
β ββ΄ = β +t t
j j j j j
f t t e u t e u t
2 3
1 1/ 6 1/ 2(b) 2 / 3)(2 )(3 ) 2 3
+ ΟΟ = = + β
Ο + Ο + Ο Ο + Ο + ΟjjF(
j 1 1 2( ) sgn( ) ( ) ( )
12 2 3β ββ΄ = + βt t
j j j j j
f t t e u t e u t 2
2 3
(1 ) 1/ 6 1/ 2 4 / 3(c) )(2 )(3 ) 2 3
+ ΟΟ = = β +
Ο + Ο + Ο Ο + Ο + Ο (d)
F(
1 1 4( ) sgn( ) ( ) ( )12 2 3
β ββ΄ = β +t t
jj j j j j j
f t t e u t e u t
j
3
2 3
(1 ) 1/ 6 1/ 2 8 / 3) 1(2 )(3 ) 2 3
+ ΟΟ = = + + β
Ο + Ο + Ο Ο + Ο + ΟF(
1 1 8( ) ( ) sgn( ) ( ) ( )12 2 3
β ββ΄ = Ξ΄ + + βt t
jj j j j j j
f t t t e u t e u t
j
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
65. ( ) 2 ( )th t e u tβ=
(a) 1 2H( ) 21 1
Ο = Γ =+ Ο + Ο
jj j
(b) V1 1 1 1/V 1 1/
H( )2 1 2
ΟΟ = =
+ Οo
i
=+ Ο
j jj j
(c) Gain = 2
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
66.
2
2
2
2 2
1 1( ) 22V ( ) 1 1 ( ) 2( ) 21
2( ) 2( ) 2 2( ) 2( )V ( ) 1
( ) 2( ) 2 ( ) 2( ) 2
2 2 4 8Let V ( ) 1 ; 1 12 2 2
A B A BV ( ) 1 Let 0 01 1 1 1 1 1 1 1
Let
Ο+Ο +ΟΟ = =
Ο + Ο ++ Ο+Ο
Ο + Ο + β Ο β Οβ΄ Ο = = +
Ο + Ο + Ο + Ο +
β Β± βΟ = β΄ = β = = β Β±
+ +
β΄ = + + = = β΄ + =+ + + β + β
o
o
o
o
jjjj
j jjj
j j j jjj j j j
xj x x x jx x
x xx j x j j j
( 1 1) ( 1 1)
A B B 2 B 1 2 A B 2, A B 21 1 1 1 1 1
B B 2 2 B B 0 B 1 1 A 1 11 1 1 1 1 1 1 1V ( ) 1 , V ( ) 11 1 1 1 ( ) 1 1 ( ) 1 1
( ) ( ) (1 1) ( ) (1 1) (β β β +
+= β β΄ + = β΄ β = = + β΄ + =
β +β΄ β + + + + = β΄ = β β β΄ = β +
β + β β β +β΄ = + + Ο = β β
+ + + β Ο + + Ο + β
β΄ = Ξ΄ β β β +
o o
j t j to
jx j jj j j j
j j j j jj j j jx j
0β
x j x j j j j jv t t j e u t j e u
45 45
)
( ) 2 ( ) 2 ( )β Β°β β Β°+ β= Ξ΄ β βj jt t j jt t
t
t e u t e u t
t( ) 2 2 cos( 45 ) ( )β= Ξ΄ β + Β°tt e t u
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
67.
22
/ 6
5 / 10 /V ( ) 105 / 35 30( ) 1/ 7 6( )
10 10 / 6V ( ) 7 16( ) 7( ) 1 ( ) ( )6 6
49 24 1 10 / 6 2 27 / 6 / 2 , 1 V ( )36 36 6 ( 1/ 6)( 1) 1/ 6 1
( ) 2( ) ( )β β
Ο ΟΟ = =
Ο + + Ο Ο + + Ο
β΄ Ο = =Ο + Ο + Ο + Ο +
β ββ΄ Ο = β Β± β = β β β΄ Ο = = ββ ββ β Ο + Ο + Ο+ Οβ β +
β΄
c
c
c
j jjj j j j
jj j j j
j jj j j j
= βt tcv t e e u t
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
68. 2 3( ) 5 ( ), ( ) 4 ( )t tf t e u t g t e u tβ β= = (a) f g
0
2 2 3 2
0 02
2 3
( ) ( )
5 4 20
20 ( 1) V( ) ( )
β
β β β β
β
β β
β = β
= =
= β β
β΄ β = β
β«
β« β«t t
t z z t z
t t
t t
f t z g z dz
e e e dz e e dz
e e
f g e e u t
2 3
5 4 20(b)
F( ) , G( ) F( )G( )2 3 ( 2)( 3)
20 20F( )G( )2 3
Ο = Ο = β΄ Ο Ο =Ο + Ο + Ο + Ο +
20( 2 ) ( )β βΟ Ο = βΟ + Ο +
j jj j j j
j j f g e u tj j
β΄ β = βt t
j j
β΄
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
69. 2( )4 2
jjjΟΟ
Ο=
+H
24( ) from Table 18.2i jj
ΟΟ
=V
Therefore o2 24 24( )
4 2 2jj
j j jΟΟ
Ο Ο Οβ‘ β€ β β
= =β ββ’ β₯+ +β£ β¦ β β V
In the time domain, then, we find 2( ) 24 ( ) Vt
ov t e u tβ=
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Engineering Circuit Analysis, 7th Edition Chapter Eightenn Solutions 10 March 2006
70. so fromTable 18.2, ( ) 2 cos 4th t e tβ=
( )( )2
2 1( )
1 1
jj
j
ΟΟ
Ο
+=
+ +H
6. Define output function f(t).
(a) ( ) 4 ( )jΟ ΟΞ΄ Ο=I
Therefore F(Ο) = 2
8 (1 ) 8( ) ( )(1 ) 16 17
jj
Ο Ο ΟΞ΄ Ο Ξ΄Ο
β‘ β€+=β’ β₯+ +β£ β¦
Ο .
The time domain output is then given by f(t) = 4/17. (b) ( ) 2 jj e ΟΟ β=I
Therefore F(Ο) = 2
4(1 )(1 ) 16
jj ej
ΟΟΟ
ββ‘ β€+β’ β₯+ +β£ β¦
.
( ) ( )14 cos 4 1 ( 1)te t u tβ β β‘ β€β ββ£ β¦ The time domain output is then given by f(t) =
(c) We find the response due to a unit step u t and treat as two unit steps, each shifted appropriately.
( ) ( )i t
2
2(1 ) 1( ) ( )(1 ) 16
jjj j
ΟΟ ΟΞ΄ ΟΟ Ο
β‘ β€+= +β’ β₯+ + β£ β¦
R
[ ]1 1( ) sgn( ) 2 cos 4 4sin 4 ( )17 17 17
ter t t t t u tβ
= + β β
Therefore the system response is
( ) { }
( ) { }
0.25
0.25
2 1 cos 4( 0.25) 4sin 4( 0.25) ( 0.25)17
2 1 cos 4( 0.25) 4sin 4( 0.25) ( 0.25)17
t
t
e t t u t
e t t u t
β +
β β
β‘ β€β + β + +β£ β¦
β‘ β€β β β β β ββ£ β¦
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