EGEE 102 Review Exam 1
Coal reserves for the World at the present rate of consumption will last for about ________.
164 years
Coal reserves for the World at the present rate of consumption will last about _________?
170 years
U.S. Coal reserves will approx. last ______ years.
205 years; 118 years (258 years)
At the current rate of consumption approximately how long will the US coal reserves last?
242 years
The energy demand in the United States accounts for approximately _____ percent of the world's energy demand.
25
At the current rate of consumption, approximately how long will the US coal reserves last?
270 years
Energy use in a developing country is projected to increase at the rate of 1.8% per year for the next few decades. How long will it take that country to double its current usage of 10 quadrillion BTUs per year?
38.89
Petroleum reserves for the World at the present rate of consumption will last for about
39 years
Petroleum reserves for the World at the present rate of consumption will last for about _____.
39 years
The flame temperature in an automobile engine is 1041oC, and the exhaust is emitted at 181oC. What is the maximum possible efficiency of this engine in percentage?
65.4 Carnot's Efficiency = (1 - (Tcold / Thot)) x 100 Thot = 1041 + 273 = 1314 K
U.S. Natural Gas reserves will approx. last ______ years.
66 years; 76.8 years (12.2 years)
Approximately _____% of energy in the US comes from Fossil Fuels
85%
Therm
A unit describing the energy contained in natural gas (used in home heating devices)
Kilowatt Hour
An amount of energy from the steady production or consumption of one kilowatt of power for a period of one hour (used in electrical fields)
lifetime of worlds and US reserves
At the current rate of consumption, the approximate lifetime of the world's petroleum, natural gas, and coal reserves is 50 years, 76.8 years, and 118 years, respectively. At the current rate of consumption, the current U. S. petroleum, natural gas, and coal reserves will last approximately for 4.88 years, 12.2 years, and 258 years, respectively. It is important to note that the entire U.S. petroleum consumption is not coming from the U.S. reserves because we import more than one half of the consumption. Because we import more than one half of the consumption, the petroleum reserves at the current rate will last about 11 years. If the consumption increases in the future, the life will be less. However, there is also a chance of adding more reserves with more exploration and discoveries. The increase in consumption can change depending on the price of petroleum and other alternative fuels.
Which one of the following is an odd set of units Correct Answer:
B ) J/s, Watt, BTU/s, kW/h J/s, Watt, BTU/s are units of Power kWh, MWh, BTU, J, Cal, Joule are units of Energy
The flame temperature in an automobile engine is 1000oC, and the exhaust is emitted at 197oC. What is the maximum possible efficiency of this engine in percentage?
Carnot's Efficiency = (1 - (Tcold / Thot)) x 100 Thot = 1000 + 273 = 1273 K Tcold = 197 + 273 = 470 K Carnot's Efficiency = (1 - (470 / 1273)) x 100 = 63.07%
Which one of the following accounts for some of the differences in the energy intensity of various countries or regions?
Climate, geography, type and/or nature of the products produced
90% of home heating in this country uses _______ or _______ as the energy sources.
E) Natural gas and electricity
A kilowatt hour (kWh) is a unit of
Electrical Energy
In the US, about 40% of the total primary energy used is converted into ______.
Electricity
The energy of electrons in motion is called A) Electricity B) Potential C) Kinetic energy D) Chemical energy
Electricity
The energy of electrons in motion is called A) Potential B) Kinetic energy C) Chemical energy D) Electricity
Electricity
Electrical Energy
Energy created through the movement of electrons among the atoms of matter
Electromagnetic Radiation
Energy from the sun comes to the earth in this form ; a type of energy that oscillates (side to side) and is coupled with electric and magnetic fields that travel freely through space (made up of protons)
Chemical Energy
Energy locked in the bonds of molecules in the form of microscopic potential energy, which exists because of the electric and magnetic forces of attraction exerted between the different parts of each molecule
Nuclear Energy
Energy produced when reactions occur in an atom, resulting in some type of structural change in the nuclei
Radiation
Energy radiated or transmitted in the form of rays, waves or particles
Kinetic Energy
Energy that a body possesses by virtue of its motion
Potential Energy
Energy that a body possesses by virtue of its position relative to a reference point
Thermal Energy
Energy that combines microscopic, kinetic and potential energy of the molecules
Which one of the following is a type of fuel formed from the remains of plants or sea creatures millions of years ago?
Fossil Fuel
Which energy source accounts for the greatest portion of electricity generation in the US?
Fossil Fuels
Which energy source accounts for the greatest proportion of electricity generation in the US?
Fossil Fuels
The form of energy in a geothermal source is
Heat
Carnot Efficiency is the energy efficiency of a __________.
Heat engine
Which one of the following is an odd set of units?
J/s, Watt, BTU/s, kW/h
Which one of the following is a list of devices from least efficient to most efficient?
Light-Bulb, Automobile Engine, Power Plant, Electric Motor
The energy possessed by a ball thrown by a quarterback is of the form? (Hint: type of energy)
Mechanical
Forms of Energy
Mechanical (Potential, Kinetic) Chemical Thermal or Heat Electrical Nuclear (Fusion, Fission) Radiation
Where do we get most of our energy?
Nonrenewable energy sources (fossil fuels: oil, natural gas, coal)
Fission
Occurs when the nucleus of one big atom splits into two new atoms, and during this process, a tremendous amount of energy is released in the form of light and heat
Fusion
Occurs when two small nuclei join together to create one large nucleus or particle, and during this process, energy is released in the form of light and heat
Which one of the following is a list of devices from the MOST efficient to the LEAST efficient?
Power Plant, automobile engine, light bulb (fluorescent), light bulb (incandescent)
Joule
Smaller than a calorie (used in science and engineering)
Food Calorie
The amount of energy needed to raise the temperature of one kilogram of water one degree Celsius (used in nutrition)
Electromagnetic Spectrum
The lower the energy, the longer the wavelength and lower the frequency, and vice versa
Power
The rate at which we do work
Energy Intensity
The relationship between energy consumption and growth in GDP; an important factor that affects changes in energy consumption over time.
Which of the following conversions is least efficient?
Thermal to Mechanical
True/False: Therm is a unit that is generally used to measure the energy contained in natural gas.
True
Units of Power
Watt, BTU per hour, Horsepower, Calories per Second, Kilowatt
Most of the electricity in the United States is generated from _____?
coal
Which is the function of generator in a power plant?
convert mechinical energy to electrical energy
In a fossil fuel fired power plant, chemical energy is finally converted into ______ energy.
electrical
(T or F) Doubling the is the time in which the rate of growth is doubled.
false
(T or F) Energy can be created when we burn fossil fuels.
false
(T or F) Most of the projected increase in the renewable energy use in the world over the next two decades is from the industrialized world.
false
Which one of the following energy conversion devices has the highest energy efficiency?
generator
The overall efficiency of a system will always be ______ than the _______ step efficiency.
lower; lowest
In a heat engine, thermal energy is converted into ________ energy.
mechanical
use of which of the following energy sources will increase worldwide from 2008 to 2030?
oil. coal, and nuclear (all of the above)
In twenty years, which one of the following fuels is likely (projected) to supply most of the world's energy?
petroleum
Which one of the following conversions is least efficient?
thermal to mechanical
(T or F) BTU is a unit of energy.
true
(T or F) Energy cannot be destroyed or created—it can only change its form.
true
(T or F) The United States has 27 percent of the world's coal deposits.
true
