ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
19th Edition
ISBN: 9781337116213
Author: MULLIN
Publisher: CENGAGE L
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Chapter 27, Problem 26R
To determine
Find the minimum size copper bonding jumpers that must be installed for the residence.
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Use Gauss-Jordan Elimination method to solve the following system:
4x1+5x2 + x3 = 2
x1-2x2-3x3 = 7
3x1 x2 2x3 = 1.
-
3. As the audio frequency of Fig. 11-7 goes down, what components of Fig.
12-4 must be modified for normal operation?
OD
C₂ 100
HF
R₁ 300
Re 300
ww
100A
R
8
Voc
Rz
10k
reset
output 3
R7
8
Voc
3
reset
output
Z
discharge
VR₁
5k
2
trigger
2 trigger
7
discharge
R 3
1k
5
control
voltage
threshold 6
5 control
voltage
6
threshold
GND
Rs
2k
C.
C.
100
GND
Uz LM555 1
Ce
0.01
U, LM555
0.01
8.01.4
PRO
Fig. 11-7
Audio lutput
Pulse width modulator
R4 1k
ww
C7
Re 1k
ww
R7 100
VR
50k
10μ
Ra
R10
C₁.
R1
3.9k
3.9k
0.14 100k
TO
w
Rs 51
82
3
H
10
Carrier
U₁
Ca
Input
A741
2.2
Us
MC1496
PWM signal
input
R2
0.1100k
Uz
A741
41
Cs
1
Re
10k
VR2
50k
VR3
100k
14
12
C3.
3% +
Ce
0.1
10μ
5
1A
HH
C
+12V
0.1
O PWM
Output
C
0.02-
R
100k +12 V
Demodulated
output
6
Ca
0.33
w
R
10k
R12
100k
ww 31
о
+
4A741
-12 V
Fig. 12-4 PWM demodulator
C
1500p
DUC
1. In Fig. 12-4, what are the functions of the VR1 and VR2?
2. In Fig. 12-4, what is the function of the VR3?
VR₁
50k
C₁ R1
0.1 100k
Carrier
Input
U₁
A741
PWM signal
input
R41k
www
Re 1k
w
C7 ±
10μT
R7 100
ww
=L
H
C4
2.2
H
W82
Rs 51
3
10
U3
MC1496
C2
R2
U2
A741
22
0.1 100k
VR2
50k
VR3
100kr
14
C3
10μ
1k
0.1
4
5
6
12
m
Re
10k
R9 R102
3.9k 3.9k
HHI
C10
0.1
-0
+12V
C11
R
0.02 100k +12 V
Demodulated
output
C
R11
R12
A741
0.33 10k
100k
-12 V
Ca
1μ
C12
1500p
PRODUC
Fig. 12-4 PWM demodulator
PRODUCTS
Chapter 27 Solutions
ELECTRICAL WIRING:RESIDENT.-TEXT (PB)
Ch. 27 - Define the Service Point. ______________Ch. 27 - Define service-drop conductors.Ch. 27 - Prob. 3RCh. 27 - a. The service head must be located (above)...Ch. 27 - Prob. 5RCh. 27 - When a conduit is extended through a roof, must it...Ch. 27 - a. What size and type of conductors are installed...Ch. 27 - How and where is the grounding electrode conductor...Ch. 27 - What are the minimum distances or clearances for...Ch. 27 - What are the minimum size ungrounded conductors...
Ch. 27 - What is the minimum size copper grounding...Ch. 27 - What is the recommended height of a meter socket...Ch. 27 - Prob. 13RCh. 27 - Prob. 14RCh. 27 - Prob. 15RCh. 27 - Prob. 16RCh. 27 - Prob. 17RCh. 27 - Prob. 18RCh. 27 - Prob. 19RCh. 27 - Prob. 20RCh. 27 - Prob. 21RCh. 27 - Prob. 22RCh. 27 - Prob. 23RCh. 27 - Prob. 24RCh. 27 - Prob. 25RCh. 27 - Prob. 26RCh. 27 - Prob. 27RCh. 27 - Prob. 28RCh. 27 - Prob. 29RCh. 27 - Prob. 30RCh. 27 - Prob. 31RCh. 27 - Prob. 32RCh. 27 - Prob. 33RCh. 27 - Prob. 34RCh. 27 - Prob. 35RCh. 27 - Prob. 36RCh. 27 - Prob. 37RCh. 27 - Prob. 38RCh. 27 - Prob. 39RCh. 27 - Prob. 40RCh. 27 - Prob. 42RCh. 27 - Prob. 43RCh. 27 - Prob. 44RCh. 27 - Prob. 45RCh. 27 - Prob. 46RCh. 27 - Prob. 47RCh. 27 - Prob. 48R
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