Print reading (final)
F
A grounded conductor is a current-carrying conductor that is connected to loads through fuses, circuit breakers, and switches.(T/F)
color coding
Conductor makes balancing loads between the three phases easier and helps with troubleshooting
ANSI
the most well known national standards organization is __
work order
A __ __ is a document that describes the work a maintenance person is required to perform
F
A disadvantage to using an electric motor drive instead of a magnetic motor starter is that most drives only allow digital signals as input signals.(T/F)
resistance
__ is the ability of a material to oppose electron flow
electrical control circuit
___ are drawn in ladder diagram format to make them easier to understand, modify, and/or program using software.
OR
___ circuit logic is a control function that requires any one or more switches to be closed before a load can be energized (ON). A. OR B. NAND C. NOT D. NOR
AND logic
___ circuit logic is a control function that requires two or more switches to be closed before a load can be energized (ON).
Soleniod
___ is an electrical output component that converts electrical energy into linear mechanical force
ladder
__ diagrams show the interconnection of input devices( such as push buttons, limit switches and temperature switches) output components such as ( lamps, motor starters, and solenoids, and other circuit control equipment's such as timers and counters
equipment log book
__ is a binder or electronic file that documents all work performed by maintenance personnel on a piece of equipment
NAND
___ circuit logic is a control function that allows a load to be energized (ON) until all the control switches or contacts are activated. A. AND B. OR C. NAND D. NOT
T
The most common length of busway is 10′.(T/F)
T
A 277/480 V, 3φ, 4-wire service includes three ungrounded (hot) lines and one grounded (neutral) line(T/F)
one line
__ diagrams are used for designing a building's power distribution system, and show the required voltages, types of transformers, power panels, and major distribution equipment
wiring
__ diagrams are used to show how one individual device or component is wired or to show how the devices and components of a circuit or system are wired together
capital letter
print divisions are denoted by a __
F
OR circuit logic is a control function that allows a load to be energized (ON) as long as the control switch or contact is not activated(T/F)
photo voltaic cell
____ is a power source that produces electricity when light strikes the surface of the cell
T
All 120 V circuits in a facility must be balanced by equally distributing power consump-tion among the three hot lines (L1, L2, and L3). (T/F)
two
All loads are connected directly to power at line____
T
Numbering each line in a control circuit allows for faster identification of the location of devices and components in smaller individual circuits.(T/F)
F
PLC programming software cannot be used to monitor and display the condition (ON or OFF) of the circuit input devices and output components.(T/F)
T
Power distribution refers to everything between the generator that produces the electric-ity and the components that consume it.(T/F)
power
The formula is why high-power electrical loads are designed for higher voltages whenever possible.
all of the above
The most common distribution systems include the following services: 120/240 V, 1φ, 3-wire and . A. 120/208 V, 3φ, 4-wire B. 120/240 V, 3φ, 4-wire C. 277/480 V, 3φ, 4-wire D. all of the above
one
Single-phase power is typically provided by __ transformer in a commercial application.
T
The control circuit part of a manufacturer's schematic diagram is not always drawn in standard ladder diagram format; however, the drawing will follow all the rules of ladder diagrams.(T/F)
T
To control the work of an electrical circuit, input devices such as temperature switches, pushbuttons, and limit switches are used to turn the loads ON and OFF(T/F)
ladder diagram
of large or complex electrical systems must always include line numbers, cross-reference numbers, terminal numbers, and as much other information as needed. A. Layout and location drawings B. Blueprints C. Ladder diagrams D. Wiring diagrams
input
devices are activated by other systems and/or are actuated manually, so their locations are typically a matter of necessity, not convenience. A. Output B. Input C. Interface D. Transformer
direct
hardwiring is the oldest and most straightforward wiring method. A. Terminal strip B. Direct C. PLC D. Electric motor drive
F
Although a circuit can have any number of switches and loads, the total number of switches determines the required wire size and the rating of the power supply.(T/F)
120V 1o
Because large commercial applications include several sets of transformer banks, power is available through some of the transformers. A. 120 V, 1φ B. 600 V, 1φ C. variable-frequency D. 50 Hz
F
Each device in a hardwired circuit is wired to the next device as specified by the line diagram, but components are never directly hardwired.(T/F)
interface
Electrical devices, such as relays, timers, counters, motor starters, heating or lighting contactors, and control transformers, are typically flexible in terms of mounting location.
T
Electrical prints such as line and wiring diagrams use symbols to show devices and components and their interconnections.(T/F)
T
Electrical utility companies distribute high-voltage 3φ power produced by AC generators.(T/F)
wiring
Even when layout and location drawings are provided, they may not include the between the components. A. terminal strips B. relative locations C. required space D. wiring
grounding conductor
Green or green with a yellow stripe is the standard color of a(n) in the electrical field. A. busway B. ungrounded conductor C. grounding conductor D. power circuit
direct hardwiring
In , each device and component is wired directly to the next device or component as specified by the line diagram.
legend sheet
In addition to abbreviations, a ___ may contain symbols, equipment identfication information and drawing conventions
above
In all manually operated switches, the operator is drawn ___ the terminals for NO switches
F
In many commercial applications and all industrial applications, the total amount of 1φ power used is large when compared to the total amount of 3φ power used.(T/F)
F
In most electric motor drive circuits, there are several voltages being used(T/F)
F
Industrial and commercial power requires different 1φ voltage than residential custom-ers require, in addition to requiring 3φ voltage for high-power loads.(T/F)
section views
__ and detail drawings are enlarged drawings of an item or feature on a print and provide additional information about an object
center to center
A __ grid system provides dimension information, identifies columns, and serves as a point of reference
load
A ___ is any electrical component in a line diagram that consumes electrical power from L1. A. load B. circuit C. terminal D. device
T
A complete grounding path must be maintained when installing electrical equipment in any facility.(T/F)
terminal strips
A motor drive typically includes for connecting other components, effectively making it a type of wiring method.
equipment
A power circuit and control circuit are required to operate process ____ .
thyristor
A(n) ___ is a solid-state switching device that switches current ON using a quick pulse of control current at its gate.
layout and location
A(n) is a drawing that helps locate devices and components for testing during troubleshooting and for system modification.
busway
A(n) is an electrical distribution system made up of busbars inside metal-enclosed boxes.
power distribution
A(n) system typically includes a conductor for grounding the system and any equipment connected to the system in addition to the normal current-carrying conductors. A. grounding B. power distribution C. wire-service D. operating
interconnecting
An __ diagram is a type of electrical drawing that shows the external connections between all system devices and components
symbol
An __ is a graphics representation of a device, component or object on a print
note
An __ is a sentence or two that provides drawing information that does not fit within the space of a drawing
Current Transformer
An __ is a transformer in which a coil is placed around a wire that carries current
T
An understanding of line diagrams is important during programmable logic controller (PLC) programming because most PLC software uses the ladder diagram format for circuit design.(T/F)
T
Circuit modifications are easier in circuits wired with terminal strips because most, if not all, of the wires required to make the changes to the circuit are disconnected and reconnected at the terminal strip.(T/F)
T
Control devices such as pushbuttons, limit switches, and pressure switches are con-nected into a circuit so that the circuit can function in a predetermined manner.(T/F)
T
Control relay coils, solenoids, alarms, and pilot lights are examples of loads that are connected directly to L2 in a line diagram.(T/F)
T
Control transformers are located in the control circuit panel and provide power for all loads in the control circuit(T/F)
T
Direct hardwiring to terminal strips is a way of organizing and simplifying the wiring for an electrical control circuit.(T/F)
F
Large commercial facilities and all industrial buildings have service entrances that are supplied 1φ power from the utility company.(T/F)
F
Loads cannot be connected in parallel when more than one load is connected to the same control section of a ladder diagram.(T/F)
control devices
The ___ in a circuit may be normally open (NO) or normally closed (NC) and connected in either series or parallel when controlling loads.
cross reference
The ___ method is a method of identifying various mechanically connected contacts of a device that are on different lines of a complex ladder diagram by line numbers.
plug in power panels
The three general types of used with busways are fusible switch, circuit breaker, and specialty plug. A. shrink-wrap applications B. plug-in power panels C. grounded conductors D. power distribution systems
preventive and predictive
The two main types of maintenance are __ maintenance and __ maintenance
PLC
Using a(n) for circuit control gives greater flexibility as it allows for monitoring of circuit input devices, output components, and the program being run. A. programmable relay B. circuit breaker C. PLC D. electric motor drive
T
When a terminal strip is used, each wire in a control circuit is assigned a reference point on the ladder diagram, and each reference point is assigned a reference number(T/F)
T
When troubleshooting a circuit with a terminal strip, the troubleshooter can go directly to the terminal strip and take measurements to isolate the problem.(T/F)
F
When wiring using terminal strips, each wire in the power circuit is assigned a refer-ence point on the line diagram to identify the different wires that connect the devices and components.(T/F)
engineers
__ assist the architects with specific design issues to guarantee the building complies with national and local building codes
punch list
__ contains items that a contractor missed or only partially completed
one line
__ diagram is an electrical drawing that uses a single line in basic symbols to show the current path, voltage values, circuit disconnect, overcurrent protection devices, transformers and panels for a circuit system.
ladder
__ diagrams are one of the most important types of electrical drawings in a set of prints because they provide a fast and easy way to understand how individual objects are connected within a system
function block
__ diagrams include timers, counters and logic blocks
request for information
__ is a formal document generated by a contractor requesting information about items that are missing or unclear on a print or specification
switchboard
__ is a power panel that is freestanding( not wall mounted)
transistor
__ is a solid state device that is used as a switch or as a signal amplifier
print convention
__ is an agreed upon method of displaying information on prints
general contractor
__ is responsible for coordinating all work done on the construction project and for providing labor and materials
hidden line
__ lines are drawn as dashed lines and are used whenever there is an edge that is not in view
predictive
__ maintenance is the monitoring of where conditions and equipment characteristics against predetermined tolerance to predict possible malfunctions or failures
terminal symbols
__ symbols ( typically small circles) are added to some symbols to indicate proper placement of connections
lighting
__ symbols are used on residential and commercial prints to show the location, type of lamp, and style of fixture.
all of the above
___ are connected between L1 and the load on a ladder diagram. A. Pushbuttons B. Limit switches C. Pressure switches D. all of the above
NOR logic
___ circuit logic is used in control circuits to detect conditions above the set limit of an input switch setting, such as excessive temperature, pressure, liquid level, current level, voltage level, or count.
technical societies
___ is an organization that is composed of groups of engineers and technical personnel united by a professional interest
contact
___ is the conducting part(pole) of a switch or relay that operates with another conducting part to make or break a circuit
isolated ground
___ receptacles are identified by an orange triangle on the face of the receptacle and or an orange colored face
numerical cross references
___ systems are necessary to trace the action of a circuit in complex line diagrams. A. Numerical cross-reference B. Wire reference number C. Dashed line D. Terminal number
prints
__are reproductions of original drawings created by an architect or engineer
specifiation
a __ is additional information that is included with a set of prints and provides details that cannot be shown on a print
relay
a __ is an interface device that allows one electrical circuit to control the opening and closing of contacts in another circuit
detail drawing
the symbol for an ___ consists of a circle divided in half by a horizontal line