ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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Textbook Question
Chapter 1.2, Problem 6RQ
How does a ground-fault circuit interrupter (GFCI) sense ground-fault current?
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solve the differential equation y'' -2y'-3y=x³e^5x cos(3x)
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3-3) Similar to Lathi & Ding prob. 3.3-7.
The signals in the figure below are modulated signals with carrier cos(5t). Find the Fourier transforms of
these signals using the appropriate properties of the Fourier transform and text Table 3.1. The sketch the
magnitude and phase spectra for figure parts (a) and (b).
Hint: these functions can be expressed in the form g(t) cos(2лfot)
(a)
1
1
2π
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σπ
(b)
(c)
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3-1) Similar to Lathi & Ding prob. 3.1-1. Use direct integration to find the Fourier transforms of the
signals shown below.
a) g₁(t) = II(t − 2) + 2 exp (−3|t|)
b) g(t) = d(t+2)+3e¯u (t − 2)
Chapter 1 Solutions
ELECTRICITY FOR TRADES
Ch. 1.1 - Does the severity of an electric shock increase or...Ch. 1.1 - In general, voltage levels above what value are...Ch. 1.1 - In general, current levels above what value are...Ch. 1.1 - What circuit fault can result in an arc flash?Ch. 1.1 - Define each of the following terms associated with...Ch. 1.1 - Explain why an arc flash is so potentially...Ch. 1.1 - What is a permit-required confined space?Ch. 1.1 - What does the term personal protective equipment...Ch. 1.1 - What personal protective attire is required when...Ch. 1.1 - When should face shields be worn?
Ch. 1.1 - A fall arrest system must be rigged so that...Ch. 1.1 - A ladder is used to reach the top of a building 16...Ch. 1.1 - What are the deck requirements for a scaffold work...Ch. 1.1 - Prob. 14RQCh. 1.1 - List the three ingredients required to sustain a...Ch. 1.1 - Which classes of fire are multipurpose...Ch. 1.1 - List four hazardous properties or characteristics.Ch. 1.2 - Prob. 1RQCh. 1.2 - Compare the terms grounding and bonding.Ch. 1.2 - Why is the earth not considered to be an effective...Ch. 1.2 - Explain what is meant by a ground fault.Ch. 1.2 - How does a ground-fault circuit interrupter (GFCI)...Ch. 1.2 - How does a ground-fault circuit interrupter (GFCI)...Ch. 1.2 - Explain what is meant by an arcing fault.Ch. 1.2 - Compare the amount of current that results from...Ch. 1.2 - Compare what GFCIs and AFCIs protect against.Ch. 1.2 - What does a lockout-tagout procedure refer to?Ch. 1.2 - Prob. 11RQCh. 1.2 - A voltmeter is used to verify that no voltage is...Ch. 1.2 - What is the main goal of OSHA?Ch. 1.2 - What is the primary purpose of the rules set forth...Ch. 1.2 - Assume a piece of electrical equipment has been...Ch. 1.2 - How often is the National Electrical Code updated...
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