Electricity for the Trades
3rd Edition
ISBN: 9781260437386
Author: Petruzella, Frank
Publisher: MCGRAW-HILL HIGHER EDUCATION
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Chapter 1.2, Problem 1RQ
To determine
Briefly explain why proper grounding practice is essential.
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Discuss any two types of grounding methods.
Q.3. Give two reasons for overloading and two reasons for short circuit and two precautions to prevent
each.
Q2) put (v) or (x) for the following and correct the wrong:
1- It is not always a good idea to have low- voltage regulations, sometimes high
impedance and high voltage regulation transformers are deliberately used to reduce the
fault voltages in circuit.
2- In Ward Leonard Method the ampere turns are varied by varying the number of field
turns. This type of arrangement is used in an electric traction system.
3- Torque produced in the armature is directly proportional to the flux per pole and the
field current.
4 - At the time of starting of all DC Motors, except for very small motors, a starter must be
connected in series with the armature.
5- Transformer transfers electrical energy from one circuit to another through capacitive
coupled conductors (the transformer's coils).
6- Total losses = variable+ constant (iron, mechanical and copper shunt field losses) +
(series field and armature winding losses).
2
7- Ph = Ke Bmax f² t²V in dc machine.
%3D
A
B
Mech. power
developed
in armature…
Chapter 1 Solutions
Electricity for the 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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