EBK ELECTRIC MOTOR CONTROL
10th Edition
ISBN: 9780100784598
Author: Herman
Publisher: YUZU
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Textbook Question
Chapter 3, Problem 3SQ
If a motor starter is installed according to directions but will not start, what is a common cause for the failure to start?
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Procedure:-
1- Connect the cct. shown in fig.(2).
a
ADDS DS
Fig.(2)
2-For resistive load, measure le output voltage by using oscilloscope ;then sketch this
wave.
3- Measure the average values ::f VL and IL:
4- Repeat steps 2 & 3 but for RL load.
Report:-
1- Calculate the D.C. output vcl age theoretically and compare it with the test value.
2- Calculate the harmonic cont :nts of the load voltage, and explain how filter
components may be selected.
3- Compare between the three-phase half & full-wave uncontrolled bridge rectifier.
4- Draw the waveform for the c:t. shown in fig.(2) but after replaced Di and D3 by
thyristors with a 30° and a2 = 90°
5- Draw the waveform for the cct. shown in fig.(2) but after replace the 6-diodes by 6-
thyristor.
6- Discuss your results.
Please solve No. 4
and 5
a.) Sketch each of the following signals, and starting with the defining relation, finds its Fourier transform
X (w)
-
a) x(t) = rect(t − 3)
b) x(t)=3t rect(t)
c) x(t) = 2te 3u1(t)
d) x(t) = e−2|t|
b.) Sketch the magnitude and phase spectrum for the four signals in Problem (a).
c) Calculate energy using time-domain and frequency domain formulas for signals in Problem (a) and
(b). Confirm Parseval's theorem using these calculations.
I need help in construct a method in matlab to find the voltage of VR1 to VR4, rhe current, and the power base on that circuit
Nominal or Theortical:
E1 = 3V , E2 = 9V, E3 = 1.5V
R1 =10Kohm, R2 =2Kohm, R3 =1Kohm, R4 =16Kohm
Chapter 3 Solutions
EBK ELECTRIC MOTOR CONTROL
Ch. 3 - Prob. 1SQCh. 3 - How many poles are required on motor starters for...Ch. 3 - If a motor starter is installed according to...Ch. 3 - Using the time limit overload or the dashpot...Ch. 3 - What causes the AC hum or chatter in AC...Ch. 3 - What is the phase relationship between the flux in...Ch. 3 - In what AC and DC devices is the principle of the...Ch. 3 - What does the electrician look for to remedy the...Ch. 3 - What type of protective enclosure is most commonly...Ch. 3 - What advantage is there in using combination...
Ch. 3 - What safety feature does the combination starter...Ch. 3 - Prob. 12SQCh. 3 - How is the size of the overload heaters selected...Ch. 3 - What type of motor starter enclosure (include NEMA...Ch. 3 - Prob. 15SQCh. 3 - Prob. 16SQCh. 3 - Prob. 17SQCh. 3 - Prob. 18SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 20SQCh. 3 - Prob. 21SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 23SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 28SQCh. 3 - Select the best answer for each of the following....Ch. 3 - Prob. 30SQCh. 3 - Prob. 31SQCh. 3 - What is the difference between a grounded control...Ch. 3 - A control transformer has a primary voltage of 480...
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