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Electrical Engineering Utilities > Chapter 2 huhu > Flashcards

Chapter 2 huhu Flashcards

1
Q

Nearly all of the electrical energy consumed is _________, __________ and _______________ by large public or privately owned companies.

A

generated, transmitted, distributed

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2
Q

_____________ is usually produced at a power station and is conveyed through a ____________ of overheated metal ________ supported on high towers.

A

Electricity, transmission system, cables

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3
Q

It is an industrial facility that house equipment to generate electricity from ________ energy.

A

Power station, primary

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4
Q

At a power station, electricity is usually generated in the range of __________ to _________ kV.

A

2.4 to 13.2

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5
Q

Most power plants use one or more ____________ that convert mechanical energy into electrical energy in order to supply power to the electrical grid for society’s electrical needs

A

generators

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6
Q

The efficacy rate of converting heat energy to mechanical energy of fossil fuel plant is

A

40 percent

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7
Q

The efficacy rate of converting heat energy to mechanical energy of nuclear plant is

A

30 %

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8
Q

a mechanical device that converts mechanical energy into electrical energy

A

generators

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9
Q

It is rotated by the generator, it is a shaft with conductor windings wrapped around an iron core, through stationary _____________, to produce _______ flow.

A

Armature, magnetic field, current

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10
Q

Kinsay crush ni Kentoy?

A

r<3n mwehehehhe

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11
Q

It is a rotary engine, is connected to the generator and drives the rotation of the armature shaft.

A

Turbine

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12
Q

a high pressure steam moves through a turbine thus rotating the discs attached to turbine shaft

A

Steam turbine

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13
Q

The steam produced for a steam turbine is produced by heating water through burning of _________, ___________ , __________ or heat coming from _____________.

A

coals, oil, natural gas, nuclear reaction

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14
Q

The most economical power stations typically generate power ______________.

A

continuously

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15
Q

For economical transmission, a step-up transformer steps up the voltage to above ____ kV, usually between ____ kV to ____ kV

A

15, 115, 765

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16
Q

Power transmission at high voltages requires _________, and subsequently, there are lower _______ losses in the transmission lines.

A

less amperage, power

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17
Q

__________________ are small facilities in fenced yards that contain transformers, switches and other electrical equipment.

A

power substationS

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18
Q

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

A

power substationS

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19
Q

___________________ generally generate, transmit, and distribute three-phase AC power. _______________ is obtained from one phase of a set of three phase line.

A

power utilitieS, Single-phase AC power

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20
Q

It is very economical to carry power at low voltage because it requires smaller conductors.

A

FALSE, high man gud

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21
Q

passageway where wires are connected to the load side of the meter enters the house or building.

A

service entrance

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22
Q

it is the point of attachment of the service entrance

A

weatherhead

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23
Q

Service entrance commonly used to supply power to your home— carrying power from the ________ through a metering device to the building’s service disconnects

A

transformer

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24
Q

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

A

service drop (OVERHEAD SERVICE ENTRANCE CONDUCTORS)

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25
Q

the penetration of service drop is sealed with a ________ to keep from leaking.

A

roof boot

26
Q

Connections at the weatherhead is extended at least __ to __ feet above the roofline and at least ___ feet above the ground.

A

2, 3, 10

27
Q

______________ are direct burial cables and usually has three conductors: two hot wires and a neutral.

A

UNDERGROUND SERVICE ENTRANCE CONDUCTORS (SERVICE LATERAL)

28
Q

Service lateral should be trenched at least __ feet underground so to avoid damage.

A

4

29
Q

Receives the service entrance conductors.

A

service entrance equipment

30
Q

The service equipment includes

A
  • measuring power through an electric meter
  • a method of cutting off power
  • overcurrent protection devices
31
Q

an instrument that is used by the utility company to measure and record electrical energy consumed.

A

electric meter

32
Q

As the current flows, the disc rotates, and pointers on dials revolve to record the amount of power used in ________.

A

electric meter, kilowatt-hours (kWh)

33
Q

this meter is a small electric motor - with a speed that is proportional to the power consumed

A

FEED-THROUGH METER

34
Q

This measure amperage through each ungrounded (hot) conductor.

A

current-transformer

35
Q

a REQUIRED part of the service entrance equipment allows electrical service from the utility company to be switched off so that power is disconnected to the building installation. It is a set of fuses or a circuit breaker that protects the service entrance conductors

A

service disconnect

36
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

37
Q

• Generally distributes power to transformers, panelboards, control equipment, and ultimately to individual system loads.

A

switch board

38
Q

• Contains overcurrent protection devices (fuses or circuit breakers) and instruments designed to neutralize/divide a large amount of electrical power into suitable levels for other electrical equipment.

A

switch board

39
Q

• Floor mounted, rated for current levels of 1200 to 6000 amperes (A), and voltages below 600 volts (V).

A

switch board

40
Q

Wall-mounted, SINGLE UNIT OF ONE OR MORE METAL CABINETS, including buses, automatic overcurrent protection devices (fuses or circuit breakers).

A

panelboard

41
Q

• Equipped with or without controlling switches for light, heat, and power circuits.

A

panelboard

42
Q

It consists of a sheet of a metal box, a cabinet, and a cover that encloses and protects the interior section containing vertical buses used to distribute power.

A

panelboard

43
Q

It may be referred to as a power panel or ___________ typically used in residential applications.

A

panelboard, load center

44
Q

Usually, it 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

45
Q

• has a secondary voltage that is less than its primary voltage.

• typically used in buildings to reduce building system voltages to useable levels

A

STEP – DOWN TRANSFORMER

46
Q

one with a _____________ that is greater than its primary voltage.

A

STEP - UP TRANSFORMER, secondary voltage

47
Q

The transformer’s desirable operation level is at only ___°F(___°C); above this rate will cut the transformer’s life by ____.

A

20, 11, half

48
Q

• small transformers use ________ by ventilation while larger ones are _________

A

air coolining, liquid-cooled

49
Q

has a single primary winding and single secondary winding

A

SINGLE-PHASE TRANSFORMER

50
Q

A 7200/240/120 V AC is a single-phase transformer commonly used in most residential and small commercial applications.

A

SINGLE-PHASE TRANSFORMER

51
Q

• A 7200 V, two-wire power is transformed and stepped down to a 120/240 V AC, three-wire system.

A

SINGLE-PHASE TRANSFORMER

52
Q

__________________ has three primary and three secondary windings.

A

THREE-PHASE TRANSFORMERS

53
Q

Two main types of three-phase transformers

A

delta and wye

54
Q

windings are connected in series, forming a triangle, thus resembling the Greek letter Delta (Δ).

A

DELTA-CONNECTED TRANSFORMER(Δ)

55
Q

only a single voltage level is available: the phase-to-phase voltages.

A

DELTA CONNECTED TRANSFORMER(Δ)

56
Q

Obtaining other voltages can only be done using step-up or step-down transformers.

A

DELTA CONNECTED TRANSFORMER(Δ)

57
Q

• has three independent transformer windings connected at a common point, called a neutral or star point.

• the angular displacement of each winding is at ___°, resembling a Y-shaped physical arrangement of the winding.

A

WYE-CONNECTED TRANSFORMER (Y) , 120

58
Q

• an electrical device that converts three-phase electric power without a neutral wire into three phase power with a neutral wire.

A

DELTA-WYE (Δ-Y) TRANSFORMER

59
Q

Voltages that have the _____ as a multiplier are ____ connections

A

1.732, WYE

60
Q

New distribution transformers are very efficient, with losses of less than ______% in large units. Most large facility distribution transformers convert at least ____% of input power into useable output power. Smaller closet transformers have efficiencies of ___% or above.

A

0.25, 95, 98

Electrical Engineering Utilities (10 decks)

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