Delmar's Standard Textbook Of Electricity
7th Edition
ISBN: 9781337900348
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 20, Problem 2PA
You are working in an industrial plant. You have been instructed to double the capacitance connected to a machine. The markings on the capacitor, however, are not visible. The capacitor is connected to 560 volts and an ammeter indicates a current of 6 amperes flowing to the capacitor. What size capacitor should be connected in parallel with the existing capacitor? What is the minimum AC voltage rating of the new capacitor? What is the minimum DC voltage rating of the new capacitor? What is the minimum KVAR size that can be used in this installation?
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Question about Controls Systems
A chemical processing plant requires a simplified safety control system to monitor critical
conditions in one of its reactors. The system must evaluate three key parameters and activate two
response levels. A combinational circuit with 3 sensors and 2 alarms needs to be designed for this
purpose.
Sensors:
A: Reactor temperature (0 = normal, 1 = high)
B: Reactor pressure (0 = normal, 1 = high)
C: Mixture pH level (0 = normal, 1 = out of range)
Alarms:
X: Warning alarm
Y: Activation of the emergency shutdown system
System requirements:
1. The warning alarm (X) should activate when:
At least two parameters are out of range.
• Or when the temperature is high (A = 1) and any other parameter is out of range.
2. The emergency shutdown system (Y) must activate when:
• All parameters are out of range simultaneously (A = 1, B = 1, C=1).
•
Or when the temperature and pressure are high simultaneously (A = 1 and B = 1), regardless
of the pH level.
Request:
1. Design the logic circuit for this…
An industrial soft drink production plant needs to implement a quality control system for its bottling
line. The system must monitor four critical parameters and activate different alarms depending on
the conditions detected. It is required to design a digital circuit with 4 inputs and 3 outputs for this
purpose.
Inputs:
A: Carbonation level (0 = normal, 1 = high)
B: Liquid temperature (0 = normal, 1 = elevated)
C: Line pressure (0 = normal, 1 = low)
D: Filling speed (0 = normal, 1 = low)
Outputs:
X: Minor adjustment alarm (triggered when an odd number of parameters are out of range)
Y: Major revision alarm (triggered when at least three parameters are out of range)
Z: Adjacent parameters alarm (triggered when exactly two adjacent parameters are out of range
System requirements:
1. The minor adjustment alarm (X) should activate when an odd number of parameters are out of
range, indicating the need to make minor adjustments to the process.
2. The major overhaul alarm (Y) should activate…
Chapter 20 Solutions
Delmar's Standard Textbook Of Electricity
Ch. 20 - Can current flow through a capacitor?Ch. 20 - What two factors determine the capacitive...Ch. 20 - How many degrees are the current and voltage out...Ch. 20 - Does the current in a pure capacitive circuit lead...Ch. 20 - 5. A 30- capacitor is connected into a 240-V,...Ch. 20 - 6. A capacitor is connected into a 1250-V, 1000-Hz...Ch. 20 - 7. A capacitor is to be connected into a 480-V,...Ch. 20 - On the average, by what factor is the life...Ch. 20 - A capacitor is connected into a 277-V, 400-Hz...Ch. 20 - A capacitor has a voltage rating of 350 VAC. Can...
Ch. 20 - A utility company plans to connect a total of 20 F...Ch. 20 - What is the minimum AC voltage rating of each...Ch. 20 - What is the total current flow through the circuit...Ch. 20 - What is the minimum KVAR rating of each capacitor...Ch. 20 - You are working as an electrician in an industrial...Ch. 20 - You are working in an industrial plant. You have...Ch. 20 - Capacitive Circuits Fill in all the missing...Ch. 20 - A 4.7-F capacitor is connected to a 60-Hz power...Ch. 20 - A capacitor is connected to a 208-volt, 60-Hz...Ch. 20 - A 0.47-F capacitor is connected to a 240-volt...Ch. 20 - Three capacitors having capacitance values of...Ch. 20 - A capacitor has a capacitive reactance of 300 ...Ch. 20 - A pure capacitive circuit is connected to a...
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