Building Electrical Materials and Equipment Flashcards
1
Q
_ is produced at a _.
A
Electricity; Power Station
2
Q
Industrial facility that house equipment to generate electricity from primary energy
A
Power Station
3
Q
Usual range of electricity generation at power station
A
2.4 - 13.2 kV
4
Q
_% - Fossil fuel plant
_% - Nuclear Plant
A
40% ; 30%
5
Q
Generators convert __ energy to __ energy
A
Mechanical; electrical
6
Q
Rotated by generator, shaft with conductor wings
A
Armature
7
Q
Armature produce current flow through __.
A
stationary magnetic field
8
Q
A
9
Q
Connected to generator and drives the rotation of armature shaft
A
Turbine
10
Q
Created to avoid danger of high-voltage power transmission in populated areas.
A
Power Substations
11
Q
Passageway where wires are connected to the load side of the meter enters the house/building.
A
Service Entrance
12
Q
A large cabinet or assembly of metal cabinets with electrical switches and devices connects/disconnects electric circuits, either manual or automatic.
A
Switch Board
13
Q
____ distributes power to transformers
A
Switch board
14
Q
Instrument used to measure and record electrical energy
A
Electric meter
15
Q
Wall-mounted, single unit of one or more metal cabinets, including buses, automatic overcurrent protection devices.
A
Panel Board
16
Q
Protection devices
A
Fuses; Circuit Breakers
17
Q
A meter that is small electric motor
A
Feed-through Meter
18
Q
Feed through meter speed is proportional to ____.
A
Power consumed
19
Q
Required part of the service entrance
A
Service Disconnect
20
Q
Works as regulator to change the voltage, current, and phase of electrical power transmitted and distributed
A
Transformers
21
Q
Various Heat Reduction Features;
Small transformers use __ by ventilation, large ones are __.
A
Air cooling; liquid-cooled
22
Q
___ deteriorates a transformer.
A
Heat build up prematurely (Transformers Heat Hazard)
23
Q
OCP Device
A
Overcurrent Protection Device
24
Q
OCP safeguards the circuit components from __.
A
overheating
25
An overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of overcurrent through it
Fuses
26
___ is the most popular type of circuit breaker.
Thermal Magnetic Type
27
"electricity's safety valve"
Fuses
28
The older type fuses have a ___ on the side and a ___ point.
bass screw point; central contact
29
Cylindrical in shape and have the contact points at either end
Cartridge Fuse
30
The highest amperage it can carry continuously without exceeding a specific temperature limit.
Overcurrent rating
31
Works as a regulator to change the voltage, current and phase of electrical power transmitted and distributed from the primary power source to a specific substation.
Transformers
32
a. Small transformers use:
b. Larger transformers use:
a. Cooling by ventilation
b. liquid-cooling
33
_____ transformer has its coils and core in a gaseous dry compound.
_____ transformer has its core and coils immersed in insulating liquid.
a. ventilated dry type
b. liquid-immersed
34
Older type fuses which has a brass screw thread on the side and a central contact point
Plug Fuses
35
The highest amperage it can carry continuously without exceeding a specific temperature limit.
Overcurrent Rating
36
Situated and used at a specific location but can be moved to another outlet such as a refrigerator, clothes washer, or clothes dryer.
Stationary Appliances
37
Typically connected to a flexible cord that is attached to a portable appliance, light, or equipment.
Plug
38
An electrical device is a component in an electrical system that is designed to ____ electricity.
carry but not use
39
The location in a branch circuit where electricity is used.
Outlet
40
Screw color for:
a. Grounded or neutral Conductor
b. Equipment Grounding Conductor
a. Silver
b. Green
41
A device placed between two or more electrical conductors in a circuit to safely and intentionally open or close the circuit or to redirect the path of current in a circuit.
Switch
42
Switches are rated by ___, ____, and ___, and are classified for AC or DC.
purpose, voltage, and amperage
43
THROW refers to the _____.
number of operations a switch can perform.
44
Designed for heavy industry, commercial, and institutional applications where safety, performance, and continuity of service are required.
Heavy-Duty Switches
45
Most commonly used switch found in buildings, where it is typically used to control a lighting installation from a single location.
Single-Pole, Single-Throw (SPST) Switch
46
Diverts current from one conductor path to another.
Single-Pole, Double-Throw (SPDT) Switch
47
A special type of SPDT switch is known as a ____, which allows the control of an installation from two locations (for instance, turning a light on or off from either end of a flight of stairs).
Three-way switch (S3)
48
Switches provide control from one or more points in a circuit
Switching Configurations
49
Economical power stations generate power ___.
continuously
49
50
Utilities use ____ and _____ consistent with safe and economical use.
highest transmission & distribution voltages
51
Overhead service entrance conductors: ____
Underground service entrance conductors: _____
Service Drop
Service Lateral
52
Extend from a pole-mounted distribution transformer to the building's service entrance.
Overhead service entrance conductors (service drop)
53
Service drop; ____ ft above roofline & at least ____ ft above the ground.
2-3; 10
54
Service equipment includes:
a.
b.
c.
a. measuring power through an electric meter
b. method of cutting off power
c. overcurrent protection devices
55
Step- Down transformer has a secondary voltage that is ___ than its primary voltage.
less
55
Secondary voltage is greater that primary voltage.
Step-up transformer
56
Drive exhaust/ventilation fans
Electric motors
57
Transformer's desirable operation level
20'F (11'C)
58
Caused by internal losses from loading, high ambient air temperature, and solar radiation in exterior locations
Transformers Heat Hazard
59
2 main types of three phase transformer
delta & wye system
60
Electronic Timers allow greater flexibility as they can easily be set for ___ cycles.
7-day
61
Sense light and open or close a circuit with the presence of light.
Photocell Controls
62
_____ respond to the motion of an infrared heat source, such as a person or animal
Infrared Sensors
63
Emit a high-frequency sound that is in the range of 25 to 40 kilohertz and well above the capacity of normal human hearing.
Ultrasonic sensors
64
Infrared & Ultrasonic sensors
Specialty Switches
65
Used in building conductor (wiring) installations as a compromise between good conductivity and economy
Copper
66
____ and ____ serve as automatic overcurrent protection devices.
Fuses and circuit breakers
67
Voltage rating is the ___.
maximum voltage the circuit breaker can carry.
68
The basic reason for using a stranded conductor is to make the conductor____.
Flexible
69
Contains more than one conductor bundled together in a factory assembly of wires.
Cables
70
CONCEALED KNOB-AND-TUBE WIRING
A wiring method uses ___, ____, and _____ to protect and support single Insulated conductors.
Knobs, tubes, and flexible nonmetallic tubing
71
Made of stranded conductors within a flexible insulated sheathing material. They are designed for flexibility and bending.
Cord
72
A wiring system composed of very thin cable with three or more conductors and special connectors and terminals.
Flat Conductor Cable
73
The maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.
Conductor Ampacity
74
Used in applications with voltages less than 30 V, such as wiring to doorbells, chimes, and thermostats.
Thermostat Cable
75
Electrical boxes and cabinets that are made of metal or non-metallic materials that protect conductors, connections, controls, and other equipment
Enclosures
76
Kind of junction box that allows access to a raceway for
snaking conductors through the raceway
Pull Box
77
In most boxes and enclosures, it can be easily removed
to allow wiring to enter the box.
Knockout
78
Metal and nonmetallic enclosures that hold devices such as switches or outlets and safety permit wiring connections
Electrical Boxes
79
Required for various single or combinations of switches, convenience outlets, blank covers, and dimmers
Cover plates
80
Electrical Nonmetallic Tubing (ENT) can also be solvent welded to rigid _____ conduit.
polyvinyl chloride
(PVC)
81
Hollow voids in floors made of precast concrete slabs (core slabs) found in certain precast concrete buildings
Cellular Concrete Floor Raceways
82
Is of a standardized, factory assembled enclosure consisting of outer duct-like housing, bus bars, and insulators
Busway
83
Drive exhaust/ventilation fans, air-handling unit blowers, refrigeration equipment, air and fluid compressors and pumps, heating system circulators, and manufacturing equipment and machinery.
Electric Motors
84
It is a fractional horsepower motor designed to operate on both AC and DC power.
Universal Motor
85
Rate of Electric motor:
horsepower (hp)
86
These motors use electromagnetic induction to cause the motor rotor to turn.
Induction motors
87
A switching device designed to start, stop and protect the motor.
Motor controllers
88
Kind of junction box that allows access to raceway for snaking conductors
Pull box
89
Uses electromagnetic induction for the motor to run.
Induction motors
90
Used in voltages less than 30V such as doorbells., chimes, and thermostats.
Thermostat cable
91
Cord is designed for _ and ___.
flexibility & bending
92
Electrical Conductor materials
Silver and Gold
93
Enclosed channel such as conduit, tube, or gutter
Raceway
94
Refers to the number of conductors the switch is opening and closing
Pole
95
A type of busway system;
deliver large amount of power with low voltage drop
Feeder Busway
96
A type of busway;
Provide power tap-offs at multiple points
Plug-in busway
97
1hp = ___ W
746
98
At start up, consumes substantially more electrical power
Inrush current
99
Motor that is capable of handling heavy starting loads
Repulsion-start Induction Motors
100
Unintentional flow of electrical currents between a power source
Ground Fault Interruption
101
A sudden increase in electrical current
Power Surge
102
A sudden increase in electrical current
Power Surge
