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Electrical grid 1 test 2 > Electrical grid 1 test 2 > Flashcards

Electrical grid 1 test 2 Flashcards

1
Q

Electrical power is generated at facilities known as.

A

Generating stations or power plants

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2
Q

generating stations use some method of rotating a magnetic field that produces electrical energy in the form of?

A

alternating current

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3
Q

the operating voltages of most generating stations are a constant value that typically falls somewhere between

A

13,800 and 24,000 volts

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4
Q

true or false, after voltage is generated at generating stations it is stepped up to a much higher voltage for long distance transmission?

A

true

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5
Q

nuclear energy is what percentage of the us energy produced?

A

20%

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6
Q

what is the fastest growing energy resource?

A

wind energy

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7
Q

mechanical energy that can be used to turn the generator thus producing electricity is?

A

steam, hydroelectric, wind, distributed generation, combustion engine/ turbine

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8
Q

distributed generation is known as what?

A

micro-generation

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9
Q

high pressure steam is produced by what methods?

A

fossil-fired generation, nuclear-fired generation, geothermal generation, solar generation

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10
Q

what psi is needed to drive the blades of a turbine to provide mechanical motion?

A

2400 - 3500 psi

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11
Q

sources of fossil fuel include what?

A

coal, petroleum, and natural gas

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12
Q

in many cases the heat from the steam is captured for another useful purpose such as heating, this is known as?

A

co-generation or combined heat and power

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13
Q

a fossil fuel formed from the decaying matter of buried plants, animals, and other gases is?

A

natural gas

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14
Q

the hot exhaust from the natural gas turbine is used to produce steam which can spin an additional steam turbine connected to another generator. this is called?

A

combined cycle

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15
Q

can crude oil be used in co-generation?

A

yes

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16
Q

natural heat from geysers or hot springs to produce steam is?

A

geothermal generation

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17
Q

the two methods of generating electricity using solar power is

A

photovoltaic and parabolic trough

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18
Q

what type of solar generation uses semi-conducting solar panels to produce electrical power in the form of direct current?

A

photovoltaic

19
Q

can direct current be turned into alternating current?

A

yes

20
Q

what type of solar generation harnesses the heat energy from the sun to heat up salt to a molten state?

A

parabolic trough

21
Q

what uses woodchips, sugarcane, switch grass etc. to fuel a boiler?

A

biomass

22
Q

what is the tube like opening used to channel water through a hydroelectric dam?

A

penstock

23
Q

two ways to harness hydroelectric power are?

A

a dam and a waterfall

24
Q

the blades of a wind turbine can?

A

change their pitch or angle to help control the speed of rotation

25
Q

the whole wind generation unit is housed in what?

A

the nacelle

26
Q

distributed generation is normally located where?

A

at the point of consumption

27
Q

one fundamental law of physics states that energy can be converted but it cannot be

A

created or destroyed

28
Q

energy in motion is most commonly seen in?

A

electrical motors

29
Q

the law of charges states that like charges

A

repel

30
Q

the law of charges also states that opposite charges

A

attract

31
Q

in ac circuits the terms positive and negative refer to the direction of?

A

current flow in a conductor

32
Q

polarity is the

A

direction of current

33
Q

the strength of the voltage to be produced depends on what three factors?

A

number of turns in a coil, strength of the magnetic field, the speed at which the magnetic lines of flux pass through the coil

34
Q

for a generator to produce one volt a single conductor must pass through how many lines of flux in one second?

A

100,000,000

35
Q

are sine waves produced by all rotating machines?

A

yes

36
Q

what is a graphical representation of what is happening to voltage in an AC circuit over a period of time?

A

sine wave

37
Q

one complete rotation of a generator is referred to as a

A

cycle

38
Q

the number of times that a generator rotates in one second is known as the

A

frequency

39
Q

how many times does voltage fall per cycle?

A

3x

40
Q

RMS stands for

A

root mean square

41
Q

the value given in most volt meters is

A

RMS

42
Q

is the RMS value always lower or higher then the peak value?

A

lower

43
Q

the maximum voltage of a sine wave

A

peak

Electrical grid 1 test 2 (2 decks)

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