Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
7th Edition
ISBN: 9780199339136
Author: Adel S. Sedra, Kenneth C. Smith
Publisher: Oxford University Press
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Question
Chapter 4, Problem 4.85P
To determine
The values of
Average output voltage when
Frequency = 1kHz, Average = 0, Amplitude = 5V.
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2.
A DC generator is shown below. This DC generator is driven by a prime mover and
rotating in counterclockwise direction. The armature is connected with a load resistor.
(i) Using cross (x) or dot (*) to indicate the current direction of each conductor in the armature.
(ii) If we want to reverse the polarity of the generated armature voltage, what can we do to?
rotation
S
load
N
6.
The figures below show the equivalent circuit of a separately excited DC generator
and the approximate relationship between the flux of main field and exciting current. The field
current I can be regulated by the variable resistor Ry, and the battery voltage supplying power to
the exciter is 12V. The armature resistance Ro is 20, and the load is 182. For the DC generator,
we aim to keep the voltage across the load (RL) constant in different speed range conditions. In the
beginning, the flux is 0.12 Wb, the DC generator speed is 1000 rpm, and the generated voltage
E。 is 100 V.
Calculate:
(1) The current flowing through the load.
(2) When the speed of generator changes to 1500 rpm, how should we adjust the exciting current
Ix to ensure Ę is still 100 V. (Hint: E₁ = Zno/60)
(3) When the speed of generator changes to 500 rpm, how should we adjust the exciting current Ix
to ensure Eo is still 100 V. (Hint: Eo = Zno/60)
Rf
ww
(Wb)
0.17
0.15
12 V
1x
F
ele
1
1
2
ell
Eo
Ro
ww
9
w
RL
Ix (A)
7.
For a shunt excited motor, the maximum allowable current is twice of the full-load
current. The full-load current is 10 A. The equivalent circuit of this motor is also shown below.
The rheostat can change the resistance by moving the slider (contact). The counter electromotive
force (CEMF) for this motor is 100 V at 1000 rpm. The power supply E, is 200 V. In this case:
(1) Calculate the minimum resistor value R at 0 rpm ensuing the motor is running within the safe
range, and calculate the power consumed by the rheostat R.
(2) Calculate the minimum effective resistor value R at 100 rpm ensuing the motor is running
within the safe range, and calculate the power consumed by the rheostat R and the delivered
mechanical power.
(3) Calculate the minimum resistor value R at 500 rpm ensuing the motor is running within the
safe range, and calculate the power consumed by the rheostat R the delivered mechanical power.
shunt
field
R
armature
rheostat
Es
+
Eo
Chapter 4 Solutions
Microelectronic Circuits (The Oxford Series in Electrical and Computer Engineering) 7th edition
Ch. 4.1 - Prob. 4.1ECh. 4.1 - Prob. 4.2ECh. 4.1 - Prob. 4.3ECh. 4.1 - Prob. 4.4ECh. 4.1 - Prob. 4.5ECh. 4.2 - Prob. 4.6ECh. 4.2 - Prob. 4.7ECh. 4.2 - Prob. 4.8ECh. 4.2 - Prob. 4.9ECh. 4.3 - Prob. 4.10E
Ch. 4.3 - Prob. D4.11ECh. 4.3 - Prob. 4.12ECh. 4.3 - Prob. 4.13ECh. 4.3 - Prob. 4.14ECh. 4.3 - Prob. D4.15ECh. 4.4 - Prob. 4.16ECh. 4.4 - Prob. 4.17ECh. 4.4 - Prob. 4.18ECh. 4.5 - Prob. 4.19ECh. 4.5 - Prob. 4.20ECh. 4.5 - Prob. 4.21ECh. 4.5 - Prob. 4.22ECh. 4.5 - Prob. 4.23ECh. 4.5 - Prob. 4.24ECh. 4.5 - Prob. 4.25ECh. 4.6 - Prob. 4.26ECh. 4.6 - Prob. 4.27ECh. 4 - Prob. 4.1PCh. 4 - Prob. 4.2PCh. 4 - Prob. 4.3PCh. 4 - Prob. 4.4PCh. 4 - Prob. 4.5PCh. 4 - Prob. 4.6PCh. 4 - Prob. D4.7PCh. 4 - Prob. D4.8PCh. 4 - Prob. 4.9PCh. 4 - Prob. 4.10PCh. 4 - Prob. D4.11PCh. 4 - Prob. 4.12PCh. 4 - Prob. 4.13PCh. 4 - Prob. 4.14PCh. 4 - Prob. D4.15PCh. 4 - Prob. 4.16PCh. 4 - Prob. 4.17PCh. 4 - Prob. 4.18PCh. 4 - Prob. 4.19PCh. 4 - Prob. 4.20PCh. 4 - Prob. 4.21PCh. 4 - Prob. 4.22PCh. 4 - Prob. 4.23PCh. 4 - Prob. 4.24PCh. 4 - Prob. 4.25PCh. 4 - Prob. 4.26PCh. 4 - Prob. 4.27PCh. 4 - Prob. 4.28PCh. 4 - Prob. 4.29PCh. 4 - Prob. 4.30PCh. 4 - Prob. 4.31PCh. 4 - Prob. 4.32PCh. 4 - Prob. 4.33PCh. 4 - Prob. 4.34PCh. 4 - Prob. 4.35PCh. 4 - Prob. 4.36PCh. 4 - Prob. D4.37PCh. 4 - Prob. 4.38PCh. 4 - Prob. 4.39PCh. 4 - Prob. 4.40PCh. 4 - Prob. 4.41PCh. 4 - Prob. 4.42PCh. 4 - Prob. 4.43PCh. 4 - Prob. 4.44PCh. 4 - Prob. D4.45PCh. 4 - Prob. 4.46PCh. 4 - Prob. 4.47PCh. 4 - Prob. 4.48PCh. 4 - Prob. 4.49PCh. 4 - Prob. 4.50PCh. 4 - Prob. 4.51PCh. 4 - Prob. 4.52PCh. 4 - Prob. 4.53PCh. 4 - Prob. 4.54PCh. 4 - Prob. 4.55PCh. 4 - Prob. D4.56PCh. 4 - Prob. D4.57PCh. 4 - Prob. 4.58PCh. 4 - Prob. 4.59PCh. 4 - Prob. D4.60PCh. 4 - Prob. 4.61PCh. 4 - Prob. 4.62PCh. 4 - Prob. D4.63PCh. 4 - Prob. D4.64PCh. 4 - Prob. D4.65PCh. 4 - Prob. D4.66PCh. 4 - Prob. 4.67PCh. 4 - Prob. 4.68PCh. 4 - Prob. 4.69PCh. 4 - Prob. 4.70PCh. 4 - Prob. 4.71PCh. 4 - Prob. 4.72PCh. 4 - Prob. D4.73PCh. 4 - Prob. D4.74PCh. 4 - Prob. D4.75PCh. 4 - Prob. 4.76PCh. 4 - Prob. 4.77PCh. 4 - Prob. 4.78PCh. 4 - Prob. 4.79PCh. 4 - Prob. D4.80PCh. 4 - Prob. D4.81PCh. 4 - Prob. D4.82PCh. 4 - Prob. D4.83PCh. 4 - Prob. D4.84PCh. 4 - Prob. 4.85PCh. 4 - Prob. 4.86PCh. 4 - Prob. 4.87PCh. 4 - Prob. 4.88PCh. 4 - Prob. 4.89PCh. 4 - Prob. 4.90PCh. 4 - Prob. 4.91PCh. 4 - Prob. 4.92PCh. 4 - Prob. 4.93PCh. 4 - Prob. 4.94PCh. 4 - Prob. 4.95PCh. 4 - Prob. 4.96PCh. 4 - Prob. 4.97P
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