Electric Motor Control
10th Edition
ISBN: 9781305177611
Author: Herman
Publisher: Cengage
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Chapter 8, Problem 1SQ
To determine
Explain why contactors are described as control pilot devices and large magnetic switches.
Expert Solution & Answer
Explanation of Solution
Discussion:
Contactors are electromagnetic switches that are very convenient for interrupting and connecting the branch circuits based on the range or size of contractors.
Contactors with a combination of pilot devices are used to control AC motors, switch lightning, and heavy loads.
Small range contactors with a combination of control devices are used for larger controls. Large contactors can control the heavy currents where overload protection is provided separately. Relays might be used to control the large contactors.
Conclusion:
Thus, the reason why contactors are described as control pilot devices and large magnetic switches is explained.
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Using D flip-flops, design a synchronous counter. The counter counts in
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1
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3
52
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56
51
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5
54
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53
0
55
58
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7
56
56
55
0
57
S10
59
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58
58
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0
59
S12
S11
7
$10
$10
59
0
$11
$14
$13
5
$12
S12
$11
0
513
$15
SO
3
S14
$14
S13
0
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515
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0
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For the oscillator resonance circuit shown in Fig. (5), derive the oscillation frequency
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5 mH
(a)
ell
+10 V
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ww
R3
S
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HH
1 με
1000 pF
100 pF
R₂
1 με
RA
H
(b)
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R4
CA
470 pF
C₁
R3
HH
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R₁
ww
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000
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ww
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Expert handwritten solution only
Chapter 8 Solutions
Electric Motor Control
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