Calculate а. rge 6. b. frequency if the speed is а. 1000 г/min b. 5 r/min nere ncy, ines.
Calculate а. rge 6. b. frequency if the speed is а. 1000 г/min b. 5 r/min nere ncy, ines.
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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Question
Number 9
![169
10
14
the are to its
Referring to Fig. 2, the of
constant, the and
In 8, if the field is kept
equivalent of a ex-
What is meant by the reac-
Calculate the of on the air-
including ac and de motors and transformers.
The 3-phase shown in Fig. 16 has
How will the be if
generates a of 9 kV, 60 Hz.
systems Using
A at 1200 r/min
tor in Fig. 12 the given.
ator can be to a system?
tance of a Draw the
plain the of all the parameters.
RONOUS GENERATORS
SYNCHRONOUS GENERATORS
e effi-
machines is a very important matter.
Calculate
h size.
put of
540 kg
6.
frequency if the speed is
a. 1000 r/min
a. The synchronous impeda
b. The total resistance of the
phase
c. The total reactance of th
oduces
times
b. 5 r/min
phase
d. The line current
elatively
Intermediate level
Questions and Problems
e. The line-to-neutral volt
nine. As
e used to
Practical level
load
equivalent circuit of a generator and ex-
f. The line voltage acros
vould be
1.
armature in large synchronous generators?
What are the advantages of using a stationary
g. The power of the turbi
alternator
er would
State the advantages of brushless excitation
nore floor
Why is the stator always connected in wye)
h. The phase angle betw
voltage across the loa
II
State the main differences between steam.
2.
a schematic circuit diagram, show how the
rotor in Fig. 7 is excited.
Referring to Fig. 13, calculate the exciting
nent of in-
ass and the
dimensions
turbine generators and salient-pole genera-
tors. For a given power output, which of
these machines is the larger?
A 3-phase generator rate
LI
900 r/min, 60 Hz delive
12
current needed to generate a no-load line
KVA, 16 kV load havin
factor of 0.8. If the sync
100 N, calculate the va
mr?
%3D
3.
In analyzing a hydropower site, it is found
that the turbines should turn at close to
voltage of
a. 24.2 kV
b. 12.1 kV
inertia of
75 kg-m23=
350 r/min. If the directly coupled genera-
The generator in Fig.
reactance of 0.4 N, pe
18
13 A3-phase generator possesses a synchro-
nous reactance of 6 2 and the excitation
voltage E, is 3 kV per phase (ref. Fig. 19).
Calculate the line-to-neutral voltage E for a
resistive load of 8 N and draw the phasor
diagram.
a. In Problem 13, draw the curve of E
versus I for the following resistive
loads: infinity, 24, 12, 6, 3, 0 ohms.
b. Calculate the active power P per phase
in each case.
tors must generate a frequency of 60 Hz,
calculate the following:
a. The number of poles on the rotor
b. The exact turbine speed
enerator are
nected to an infinite E
ng contrast to
age of 14 kV, and the
adjusted to 1.14 pu.
An isolated 3-phase generator produces a
no-load line voltage of 13.2 kV. If a load
having a lagging power factor of 0.8 is
connected to the machine, must the excita-
tion be increased or decreased in order to
maintain the same line voltage?
Calculate
nase
a. The torque angle
delivers 420 MW
b. The mechanical
c. The linear pole:
the inside stator
LEGO
5.
What conditions must be met before a gener-
C. Draw the curve of E versus P. For what
value of load resistance is the power
output a maximum?
corresponding t
angle [in]
Calculate the number of poles on the genera-
9.
A test taken on th
15
Fig. 2 yields the
1. Open-circuit
de exciting c
2. Using the sa
Calculate the number of poles
one pole-pitch measured along the internal
circumference of the stator.
rature rise. When
craft generator shown in Fig. 11.
e heat-dissipating
reases 9 times but
91
8.
the following characteristics:
armature she
nce, the power dis-
es by a factor of 3.
ooling means are
nd to be hotter. To
line current
E, = 2440 V
Calculate
terminals?
X = 144 2
a. The base inm
%3D
g materials, the tem-
d to a maximum of
a. Resistive load
b. Inductive load
per phase
b. The value e
R = 17 2
c. Capacitive load](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F585e4a80-646c-4418-ada9-cb992a2ce44b%2F5228e50d-4f75-46a1-a5cd-ca48b57853c0%2Fvwgekhq.jpeg&w=3840&q=75)
Transcribed Image Text:169
10
14
the are to its
Referring to Fig. 2, the of
constant, the and
In 8, if the field is kept
equivalent of a ex-
What is meant by the reac-
Calculate the of on the air-
including ac and de motors and transformers.
The 3-phase shown in Fig. 16 has
How will the be if
generates a of 9 kV, 60 Hz.
systems Using
A at 1200 r/min
tor in Fig. 12 the given.
ator can be to a system?
tance of a Draw the
plain the of all the parameters.
RONOUS GENERATORS
SYNCHRONOUS GENERATORS
e effi-
machines is a very important matter.
Calculate
h size.
put of
540 kg
6.
frequency if the speed is
a. 1000 r/min
a. The synchronous impeda
b. The total resistance of the
phase
c. The total reactance of th
oduces
times
b. 5 r/min
phase
d. The line current
elatively
Intermediate level
Questions and Problems
e. The line-to-neutral volt
nine. As
e used to
Practical level
load
equivalent circuit of a generator and ex-
f. The line voltage acros
vould be
1.
armature in large synchronous generators?
What are the advantages of using a stationary
g. The power of the turbi
alternator
er would
State the advantages of brushless excitation
nore floor
Why is the stator always connected in wye)
h. The phase angle betw
voltage across the loa
II
State the main differences between steam.
2.
a schematic circuit diagram, show how the
rotor in Fig. 7 is excited.
Referring to Fig. 13, calculate the exciting
nent of in-
ass and the
dimensions
turbine generators and salient-pole genera-
tors. For a given power output, which of
these machines is the larger?
A 3-phase generator rate
LI
900 r/min, 60 Hz delive
12
current needed to generate a no-load line
KVA, 16 kV load havin
factor of 0.8. If the sync
100 N, calculate the va
mr?
%3D
3.
In analyzing a hydropower site, it is found
that the turbines should turn at close to
voltage of
a. 24.2 kV
b. 12.1 kV
inertia of
75 kg-m23=
350 r/min. If the directly coupled genera-
The generator in Fig.
reactance of 0.4 N, pe
18
13 A3-phase generator possesses a synchro-
nous reactance of 6 2 and the excitation
voltage E, is 3 kV per phase (ref. Fig. 19).
Calculate the line-to-neutral voltage E for a
resistive load of 8 N and draw the phasor
diagram.
a. In Problem 13, draw the curve of E
versus I for the following resistive
loads: infinity, 24, 12, 6, 3, 0 ohms.
b. Calculate the active power P per phase
in each case.
tors must generate a frequency of 60 Hz,
calculate the following:
a. The number of poles on the rotor
b. The exact turbine speed
enerator are
nected to an infinite E
ng contrast to
age of 14 kV, and the
adjusted to 1.14 pu.
An isolated 3-phase generator produces a
no-load line voltage of 13.2 kV. If a load
having a lagging power factor of 0.8 is
connected to the machine, must the excita-
tion be increased or decreased in order to
maintain the same line voltage?
Calculate
nase
a. The torque angle
delivers 420 MW
b. The mechanical
c. The linear pole:
the inside stator
LEGO
5.
What conditions must be met before a gener-
C. Draw the curve of E versus P. For what
value of load resistance is the power
output a maximum?
corresponding t
angle [in]
Calculate the number of poles on the genera-
9.
A test taken on th
15
Fig. 2 yields the
1. Open-circuit
de exciting c
2. Using the sa
Calculate the number of poles
one pole-pitch measured along the internal
circumference of the stator.
rature rise. When
craft generator shown in Fig. 11.
e heat-dissipating
reases 9 times but
91
8.
the following characteristics:
armature she
nce, the power dis-
es by a factor of 3.
ooling means are
nd to be hotter. To
line current
E, = 2440 V
Calculate
terminals?
X = 144 2
a. The base inm
%3D
g materials, the tem-
d to a maximum of
a. Resistive load
b. Inductive load
per phase
b. The value e
R = 17 2
c. Capacitive load
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