
Electric Motor Control
10th Edition
ISBN: 9781133702818
Author: Herman
Publisher: CENGAGE L
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Question
Chapter 19, Problem 1SQ
To determine
Explain why the selector switch and a two-wire pilot device should be connected to the magnetic starter to control a large motor and they cannot be controlled directly.
Expert Solution & Answer

Explanation of Solution
If the contacts of the selector switch and automatic pilot device are large enough to pass the safety full-load current of motor, then they can control the motor directly, but the contact capacity of these devices is generally not large enough for huge motors.
Hence, these devices cannot be utilized to control the motor directly.
These two devices are connected to magnetic starter for controlling a large motor.
Conclusion:
Thus, the given statement is explained.
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Q1/Sketch the root locus for the system shown in Figure 1 and find the following:
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Exam2
Subject: (Numerical Analysis)
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Date: 27/4/2025
Time: 60 minutes
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