EGEE 101 Final Exam

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what size of particulates are the most harmful to human health

0.1 - 2.0 microns

If H=3 meters, Q= 3 cubic meters per second, and efficiency is 50%, what is the power output in watts? assume 9.81

44,145 watts

If a solar farm generates 10 MW in Arizona (320 Sunny days) is moved to PA (160 Sunny days), what is the new power output

5 MW

a hydropower dam is rated for 1 GW power generation. the annual energy output is 4380 GWH. what percentage of its capacity is used

50%

betz's law dictates that the max efficiency that can be achieved with a wind turbine is

59%

weather and climate are the same thing

false

which fossil fuel is the cleanest burning

natural gas

the process of two smaller nuclei combining with one larger nucleus

nuclear fusion

installing radiant flooring, insulating windows, and heavy curtains to absorb the suns warmth

passive solar heating

layers of silicon that directly convert sunlight into an electric current

photovoltaic cells

how long has fracking been being performed in the US

since 1947

a calorie is defined as

the amount of energy required to raise the temp of one gram of water by one degree Celsius

A BTU is defined as

the amount of energy required to raise the temperature of one LB of water by one degree Fahrenheit

a technology that extracts energy out of waves

tidal

what is the main use for petroleum

transportation

after a uranium based fuel rod has spent 3 years in a reactor, how much of its uranium has been used?

10%

how much stronger to climate models predict extreme weather like hurricanes will become by 2100

10% stronger

what percentage of the worlds electricity comes from dams

20%

a power plant produces 50 MJ of useful energy and 200 MJ of wasted heat. what is the efficiency?

20% (50/250)

If a solar farm requires 40 acres in Iowa (210 sunny days), how much land would it require in Nevada (350 sunny days)

24 acres

a power plant produces 50 MJ of useful energy and 100 MJ of wasted heat. What is the efficiency?

33%

how many ranks of coal are there

4

a proximate analysis shows that a certain lignite coal is 10% moisture, 30% volatiles, and 10% ash. what is the % fixed carbon

50%

If there are 6500 TCF of proved reserves of nat gas in the world and we are consuming 123 TCF per year, how long until we run out?

52.8 years

what percentage of the US's electricity comes from hydroelectric dams

7%

panels that use sunlight to heat up air or water and transfer it to your forced air heating or residential water heater

active solar heating

radioactive decay that emits two protons and two neutrons

alpha decay

which coal rank has the highest heating value

anthracite

which fossil fuel contains ash

coal

which is more expensive, $100/ton of coal or $3/mcf of natural gas

coal

which of the fossil fuels are regional commodities with regional prices

coal and natural gas

is the US a new importer or exporter of natural gas

exporter

nuclear, wind, solar, and hydropower are all renewable forms of energy

false (nuclear)

what is work

force x displacement

how much carbon dioxide have we emitted into the atmosphere by burning fossil fuels since the industrial revolution

half a trillion tons

the challenge associated with wind energy that fluctuates throughout the day

intermittency

the problem of needing to install large transmission capacity to move electrons from the power generation source to a market

location problem

oil and natural gas typically form in what environment

marine life preserved at the bottom of deep lakes

what is the main component of natural gas

methane

which fossil fuel has the highest heating value per lb?

natural gas

geothermal power plants are best when located

near rift zones

the process of one larger nucleus dividing into two smaller nuclei

nuclear fission

what is the form of energy contained in a dam called

potential

the challenge associated with wind energy whose power output cannot be forecast in advance

predictability

reflecting sunlight off of mirrors to create concentrated heat for generating steam to rotate a turbine to induce an electric current

solar thermal energy conversion

In the past, decreasing fertility rates were associated with decreasing poverty levels

true

The three main problems with fossil fuels are that they are non-renewable, pollution, and climate change

true

as population increases, energy consumption increases

true

biomass is essentially carbon neutral

true

wind is caused by

uneven heating of the earths surface

how much did the temp warm from 1850-2007

0.85 C

the temp at which nuclear fusion becomes possible

13 million C

at current US reserves, how long will coal last?

283 years

nuclear fuel rods are ___ uranium by concentration

3-4%

At current US reserves, how long will natural gas last?

86 years

what is the largest energy consumer at home?

space heating

what is energy

the capacity to do work

the consensus of the scientific community is that deep geologic storage of high level radioactive waste is a safe long term solution

true

the sun delivers approx 10,000 times more energy per second to earth than the whole world's population uses

true


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