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EE 30 Chapter 2 > Building Electrical Materials and Equipment > Flashcards

Building Electrical Materials and Equipment Flashcards

1
Q

_ is produced at a _.

A

Electricity; Power Station

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2
Q

Industrial facility that house equipment to generate electricity from primary energy

A

Power Station

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3
Q

Usual range of electricity generation at power station

A

2.4 - 13.2 kV

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4
Q

_% - Fossil fuel plant
_% - Nuclear Plant

A

40% ; 30%

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5
Q

Generators convert __ energy to __ energy

A

Mechanical; electrical

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6
Q

Rotated by generator, shaft with conductor wings

A

Armature

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7
Q

Armature produce current flow through __.

A

stationary magnetic field

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8
Q
A
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9
Q

Connected to generator and drives the rotation of armature shaft

A

Turbine

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10
Q

Created to avoid danger of high-voltage power transmission in populated areas.

A

Power Substations

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11
Q

Passageway where wires are connected to the load side of the meter enters the house/building.

A

Service Entrance

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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

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13
Q

____ distributes power to transformers

A

Switch board

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14
Q

Instrument used to measure and record electrical energy

A

Electric meter

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15
Q

Wall-mounted, single unit of one or more metal cabinets, including buses, automatic overcurrent protection devices.

A

Panel Board

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16
Q

Protection devices

A

Fuses; Circuit Breakers

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17
Q

A meter that is small electric motor

A

Feed-through Meter

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18
Q

Feed through meter speed is proportional to ____.

A

Power consumed

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19
Q

Required part of the service entrance

A

Service Disconnect

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20
Q

Works as regulator to change the voltage, current, and phase of electrical power transmitted and distributed

A

Transformers

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21
Q

Various Heat Reduction Features;

Small transformers use __ by ventilation, large ones are __.

A

Air cooling; liquid-cooled

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22
Q

___ deteriorates a transformer.

A

Heat build up prematurely (Transformers Heat Hazard)

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23
Q

OCP Device

A

Overcurrent Protection Device

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24
Q

OCP safeguards the circuit components from __.

A

overheating

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25
Q

An overcurrent protective device with a circuit-opening fusible part that is heated and severed by the passage of overcurrent through it

A

Fuses

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26
Q

___ is the most popular type of circuit breaker.

A

Thermal Magnetic Type

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27
Q

“electricity’s safety valve”

A

Fuses

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28
Q

The older type fuses have a ___ on the side and a ___ point.

A

bass screw point; central contact

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29
Q

Cylindrical in shape and have the contact points at either end

A

Cartridge Fuse

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30
Q

The highest amperage it can carry continuously without exceeding a specific temperature limit.

A

Overcurrent rating

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31
Q

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.

A

Transformers

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32
Q

a. Small transformers use:
b. Larger transformers use:

A

a. Cooling by ventilation
b. liquid-cooling

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33
Q

_____ transformer has its coils and core in a gaseous dry compound.

_____ transformer has its core and coils immersed in insulating liquid.

A

a. ventilated dry type
b. liquid-immersed

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34
Q

Older type fuses which has a brass screw thread on the side and a central contact point

A

Plug Fuses

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35
Q

The highest amperage it can carry continuously without exceeding a specific temperature limit.

A

Overcurrent Rating

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36
Q

Situated and used at a specific location but can be moved to another outlet such as a refrigerator, clothes washer, or clothes dryer.

A

Stationary Appliances

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37
Q

Typically connected to a flexible cord that is attached to a portable appliance, light, or equipment.

A

Plug

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38
Q

An electrical device is a component in an electrical system that is designed to ____ electricity.

A

carry but not use

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39
Q

The location in a branch circuit where electricity is used.

A

Outlet

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40
Q

Screw color for:
a. Grounded or neutral Conductor

b. Equipment Grounding Conductor

A

a. Silver
b. Green

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41
Q

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.

A

Switch

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42
Q

Switches are rated by ___, ____, and ___, and are classified for AC or DC.

A

purpose, voltage, and amperage

43
Q

THROW refers to the _____.

A

number of operations a switch can perform.

44
Q

Designed for heavy industry, commercial, and institutional applications where safety, performance, and continuity of service are required.

A

Heavy-Duty Switches

45
Q

Most commonly used switch found in buildings, where it is typically used to control a lighting installation from a single location.

A

Single-Pole, Single-Throw (SPST) Switch

46
Q

Diverts current from one conductor path to another.

A

Single-Pole, Double-Throw (SPDT) Switch

47
Q

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).

A

Three-way switch (S3)

48
Q

Switches provide control from one or more points in a circuit

A

Switching Configurations

49
Q

Economical power stations generate power ___.

A

continuously

49
Q
A
50
Q

Utilities use ____ and _____ consistent with safe and economical use.

A

highest transmission & distribution voltages

51
Q

Overhead service entrance conductors: ____

Underground service entrance conductors: _____

A

Service Drop
Service Lateral

52
Q

Extend from a pole-mounted distribution transformer to the building’s service entrance.

A

Overhead service entrance conductors (service drop)

53
Q

Service drop; ____ ft above roofline & at least ____ ft above the ground.

A

2-3; 10

54
Q

Service equipment includes:
a.
b.
c.

A

a. measuring power through an electric meter
b. method of cutting off power
c. overcurrent protection devices

55
Q

Step- Down transformer has a secondary voltage that is ___ than its primary voltage.

A

less

55
Q

Secondary voltage is greater that primary voltage.

A

Step-up transformer

56
Q

Drive exhaust/ventilation fans

A

Electric motors

57
Q

Transformer’s desirable operation level

A

20’F (11’C)

58
Q

Caused by internal losses from loading, high ambient air temperature, and solar radiation in exterior locations

A

Transformers Heat Hazard

59
Q

2 main types of three phase transformer

A

delta & wye system

60
Q

Electronic Timers allow greater flexibility as they can easily be set for ___ cycles.

A

7-day

61
Q

Sense light and open or close a circuit with the presence of light.

A

Photocell Controls

62
Q

_____ respond to the motion of an infrared heat source, such as a person or animal

A

Infrared Sensors

63
Q

Emit a high-frequency sound that is in the range of 25 to 40 kilohertz and well above the capacity of normal human hearing.

A

Ultrasonic sensors

64
Q

Infrared & Ultrasonic sensors

A

Specialty Switches

65
Q

Used in building conductor (wiring) installations as a compromise between good conductivity and economy

A

Copper

66
Q

____ and ____ serve as automatic overcurrent protection devices.

A

Fuses and circuit breakers

67
Q

Voltage rating is the ___.

A

maximum voltage the circuit breaker can carry.

68
Q

The basic reason for using a stranded conductor is to make the conductor____.

A

Flexible

69
Q

Contains more than one conductor bundled together in a factory assembly of wires.

A

Cables

70
Q

CONCEALED KNOB-AND-TUBE WIRING

A wiring method uses ___, ____, and _____ to protect and support single Insulated conductors.

A

Knobs, tubes, and flexible nonmetallic tubing

71
Q

Made of stranded conductors within a flexible insulated sheathing material. They are designed for flexibility and bending.

A

Cord

72
Q

A wiring system composed of very thin cable with three or more conductors and special connectors and terminals.

A

Flat Conductor Cable

73
Q

The maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

A

Conductor Ampacity

74
Q

Used in applications with voltages less than 30 V, such as wiring to doorbells, chimes, and thermostats.

A

Thermostat Cable

75
Q

Electrical boxes and cabinets that are made of metal or non-metallic materials that protect conductors, connections, controls, and other equipment

A

Enclosures

76
Q

Kind of junction box that allows access to a raceway for
snaking conductors through the raceway

A

Pull Box

77
Q

In most boxes and enclosures, it can be easily removed
to allow wiring to enter the box.

A

Knockout

78
Q

Metal and nonmetallic enclosures that hold devices such as switches or outlets and safety permit wiring connections

A

Electrical Boxes

79
Q

Required for various single or combinations of switches, convenience outlets, blank covers, and dimmers

A

Cover plates

80
Q

Electrical Nonmetallic Tubing (ENT) can also be solvent welded to rigid _____ conduit.

A

polyvinyl chloride
(PVC)

81
Q

Hollow voids in floors made of precast concrete slabs (core slabs) found in certain precast concrete buildings

A

Cellular Concrete Floor Raceways

82
Q

Is of a standardized, factory assembled enclosure consisting of outer duct-like housing, bus bars, and insulators

A

Busway

83
Q

Drive exhaust/ventilation fans, air-handling unit blowers, refrigeration equipment, air and fluid compressors and pumps, heating system circulators, and manufacturing equipment and machinery.

A

Electric Motors

84
Q

It is a fractional horsepower motor designed to operate on both AC and DC power.

A

Universal Motor

85
Q

Rate of Electric motor:

A

horsepower (hp)

86
Q

These motors use electromagnetic induction to cause the motor rotor to turn.

A

Induction motors

87
Q

A switching device designed to start, stop and protect the motor.

A

Motor controllers

88
Q

Kind of junction box that allows access to raceway for snaking conductors

A

Pull box

89
Q

Uses electromagnetic induction for the motor to run.

A

Induction motors

90
Q

Used in voltages less than 30V such as doorbells., chimes, and thermostats.

A

Thermostat cable

91
Q

Cord is designed for _ and ___.

A

flexibility & bending

92
Q

Electrical Conductor materials

A

Silver and Gold

93
Q

Enclosed channel such as conduit, tube, or gutter

A

Raceway

94
Q

Refers to the number of conductors the switch is opening and closing

A

Pole

95
Q

A type of busway system;
deliver large amount of power with low voltage drop

A

Feeder Busway

96
Q

A type of busway;
Provide power tap-offs at multiple points

A

Plug-in busway

97
Q

1hp = ___ W

A

746

98
Q

At start up, consumes substantially more electrical power

A

Inrush current

99
Q

Motor that is capable of handling heavy starting loads

A

Repulsion-start Induction Motors

100
Q

Unintentional flow of electrical currents between a power source

A

Ground Fault Interruption

101
Q

A sudden increase in electrical current

A

Power Surge

102
Q

A sudden increase in electrical current

A

Power Surge

EE 30 Chapter 2 (1 decks)

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