ELECTRICITY FOR THE TRADES W/ACCESS
3rd Edition
ISBN: 9781264605309
Author: Petruzella
Publisher: MCG
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Question
Chapter 1.2, Problem 11RQ
To determine
Mention the safety way to open a disconnect switch using a lockout–tagout procedure.
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Students have asked these similar questions
Lockout is required:
During servicing and maintenance where unexpected ener-
gization or start-up of equipment could harm employees.
During repair and replacement work, and during renovation
work.
a.
b.
C.
During modifications or other adjustments to powered
equipment.
d.
All of the above.
Lockout may involve:
Opening a disconnect switch.
b.
a.
Closing a valve.
Placing a block in the equipment.
d. All of the above.
C.
Lockout is the process ci
Shutting off a machine at the end of a shift.
Warning equipment operators about the risks involved in
bypassing a machine guard.
Preventing the flow of energy from a power source to a
piece of equipment, and keeping it from operating.
a.
b.
C.
d.
Preventing mechanics from starting repairs without the
machine operators' knowledge.
Tagout:
Serves as a warning.
b. Physically restrains a person from operating a power source.
Must be applied using specialized tagout tools.
a.
C.
d.
Must be worn like a badge by the employee who is doing
the repairs.…
2. A push-button switch that contains a spring to return the button to its original after being pushed is the
_______ switch. A. toggleB. slideC. push on/push off D. momentary action
3. If a mechanical switch is used to control a digital number display circuit, the likely result will be A. contact bounce.B. an extremely bright display.C. a blown fuse.
D. a short circuit.
7. Which statement is true for the process-control relay ladder diagram shown in the figure?
A. The pressure switch, temperature switch, and push button must be closed for the motor to start.
B. With the temperature switch closed, the motor will start once the push button is pressed.
C. With the pressure switch closed and the push button released, the motor will start.
D. Only the temperature switch has to close for the motor to start.
Chapter 1 Solutions
ELECTRICITY FOR THE TRADES W/ACCESS
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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- A disconnect switch is used to __________. a. open and close the main power source to a piece of equipment b. stop and start a compressor c. control the operation of an electric heater d. open when an unsafe condition occursarrow_forwardWhat are the key requirements for fuses for overcurrent protection? A thyristor gate can be triggered by using DC gate triggering, AC Gate Triggering and Pulse Gate Triggering. Which type of gate triggering is preferred for thyristor gate triggering and why? Explainarrow_forwardWhat is the Lock Out Tag Out system used by electricians?arrow_forward
- 6. What is the main functions of isolation switches in power system? 7. How many categories can isolation switches be divided into? 8. What is main different between circuit breaker and isolation switch? What will happens when the load current is cut off with the isolation switch?arrow_forwardDescribe a situation where you would need to use a combination single-pole/three-way switch.arrow_forwardExplain the concept of load shedding and the criteria used to determine which loads should be shed during a system emergency.arrow_forward
- 1What is the condition of a one-way switch if it has no resistance between terminals at both toggle positions 1 & 2? Is it still usable or not? Explain. 2 A one-way switch is in ON position if its resistance between terminals is almost zero. Explain. 3. Can a push button switch be used to control a lamp? Explain. 4. Identify the ON and OFF positions of the MCB. 5. A bulb or lamp is busted or broken if its resistance is less than 100Q. True or False?arrow_forwardWhat would be the purpose of using an OHA (off-hand-auto) switch instead of a standard HOA (hand-off-auto) switch?arrow_forwardTor F 1. Extended head pushbuttons are typically used for stop functions. T or F 2. A NC pushbutton will pass power when the button is pressed. T or F 3. A white pilot light is typiçally used to indicate a fault or danger. Tor F 4. Pick-up voltage is the amount of voltage required to operate or transition the contacts of a relay. T or F 5. A seal in contact allows the circuit to remain energized when the starting condition is removed.arrow_forward
- If you are going to choose between a fuse and a circuit breaker as a disconnecting means, what will you choose and why?arrow_forwardExplain the operation of the switchover valve and its purpose.arrow_forwardWho has the responsibility for Code interpretations? When are rules in the PEC mandatory and when are they advisory? What color-coding is required on multiwire branch circuits? What is the basis for figuring the general lighting loads in occupancies?arrow_forward
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