Electrical grid 1 test 2

Question 1

Electrical power is generated at facilities known as.

Answer 1

Generating stations or power plants

Question 2

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

Answer 2

alternating current

Question 3

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

Answer 3

13,800 and 24,000 volts

Question 4

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

Answer 4

true

Question 5

nuclear energy is what percentage of the us energy produced?

Answer 5

20%

Question 6

what is the fastest growing energy resource?

Answer 6

wind energy

Question 7

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

Answer 7

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

Question 8

distributed generation is known as what?

Answer 8

micro-generation

Question 9

high pressure steam is produced by what methods?

Answer 9

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

Question 10

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

Answer 10

2400 - 3500 psi

Question 11

sources of fossil fuel include what?

Answer 11

coal, petroleum, and natural gas

Question 12

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

Answer 12

co-generation or combined heat and power

Question 13

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

Answer 13

natural gas

Question 14

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?

Answer 14

combined cycle

Question 15

can crude oil be used in co-generation?

Answer 15

yes

Question 16

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

Answer 16

geothermal generation

Question 17

the two methods of generating electricity using solar power is

Answer 17

photovoltaic and parabolic trough

Question 18

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

Answer 18

photovoltaic

Question 19

can direct current be turned into alternating current?

Answer 19

yes

Question 20

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

Answer 20

parabolic trough

Question 21

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

Answer 21

biomass

Question 22

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

Answer 22

penstock

Question 23

two ways to harness hydroelectric power are?

Answer 23

a dam and a waterfall

Question 24

the blades of a wind turbine can?

Answer 24

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

Question 25

the whole wind generation unit is housed in what?

Answer 25

the nacelle

Question 26

distributed generation is normally located where?

Answer 26

at the point of consumption

Question 27

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

Answer 27

created or destroyed

Question 28

energy in motion is most commonly seen in?

Answer 28

electrical motors

Question 29

the law of charges states that like charges

Answer 29

repel

Question 30

the law of charges also states that opposite charges

Answer 30

attract

Question 31

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

Answer 31

current flow in a conductor

Question 32

polarity is the

Answer 32

direction of current

Question 33

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

Answer 33

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

Question 34

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

Answer 34

100,000,000

Question 35

are sine waves produced by all rotating machines?

Answer 35

yes

Question 36

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

Answer 36

sine wave

Question 37

one complete rotation of a generator is referred to as a

Answer 37

cycle

Question 38

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

Answer 38

frequency

Question 39

how many times does voltage fall per cycle?

Answer 39

3x

Question 40

RMS stands for

Answer 40

root mean square

Question 41

the value given in most volt meters is

Answer 41

RMS

Question 42

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

Answer 42

lower

Question 43

the maximum voltage of a sine wave

Answer 43

peak