ELECTRICITY FOR TRADES
3rd Edition
ISBN: 9780078118630
Author: Petruzella
Publisher: RENT MCG
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Chapter 1.2, Problem 1RQ
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Briefly explain why proper grounding practice is essential.
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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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- 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…arrow_forwardWhy Kelvin bridge is used for measurement of low resistance ____________________. a. due to a large current flow b. due to power dissipation across the circuit c. due to contact and lead resistance d. due to emf source usedarrow_forwardQuestion Aarrow_forward
- How does power system stability analysis help in ensuring the reliable operation of the electrical grid, and what are the main factors influencing stability?arrow_forwardWhat is a recloser? For what purposes and for what kind of faults can it be used frequently? Explain the impacts of reclosers on supply quality considering the quality indices (SAIDI, SAIFI).arrow_forwardExplain the concept of grid resilience and the measures taken to ensure power system reliability during extreme events.arrow_forward
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- 1.A. You've assembled the following components to join two copper conductors: a mould, powdered copperoxide, powdered aluminum, and an igniter. With these components, which of the following processes willyou use to connect the conductors?A. Exothermic weldingB. Irreversible compression groundingC. Mechanical groundingD. Thermal cycling 1.B. Two electricians are discussing voltage ratings. Electrician A says that a motor that's installed 40 feetfrom a power source will show a lower applied voltage than a motor that's installed 20 feet from the samepower source. Electrician B says that an exact voltage of 240 V must be applied to a motor that's rated at240 V. Who is correct?A. Neither Electrician A nor Electrician B is correct.B. Only Electrician A is correct.C. Only Electrician B is correct.D. Both Electrician A and Electrician B are correct.arrow_forwardF.a-The best method of performing pneumatic system inspection is with a(n)A. ultrasonic listening device.B. vibration listening device.C. screwdriver to your ear.D. careful eye on system operation.F.b- What type of seal system is constructed of a hard brittle material and is often used in a pump to sealbetween the pump and the motor?A. SteelB. FiberglassC. CeramicD. GlassF.c- When a pneumatic solenoid fails, the failure is normally due to aA. weak pilot.B. bad spool.C. ripped seal.D. faulty coil.arrow_forwardDiscuss the method of balance detection for locating partial discharge in electrical equipment. High voltage engineeringarrow_forward
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