EGEE 101 Final Exam
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