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Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9261
Arquitetura de Computadores
Em uma arquitetura de PCs 80286, qual das IRQs abaixo apresenta menor prioridade?
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9260
Programação
Na linha de comandos de um shell do sistema operacional Linux, um usuário emitiu com sucesso o seguinte comando:
lp meutexto.txt &
O sinal & indica que o comando deve ser executado:
lp meutexto.txt &
O sinal & indica que o comando deve ser executado:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9259
Sistemas Operacionais
Ao executar o comando
more /etc/passwd
como usuário root em um computador rodando o sistema operacional Linux, pode-se:
more /etc/passwd
como usuário root em um computador rodando o sistema operacional Linux, pode-se:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9256
Sistemas Operacionais
Para o gerenciamento de contas no Microsoft Windows 2000 Server, considerando instalação padrão em português, são feitas as afirmativas a seguir.
I - Uma conta de usuário, uma vez criada, não pode ser renomeada.
II - Um grupo local pode ser excluído mesmo que ele apresente usuários associados.
III - Se um grupo local de usuários for criado com o mesmo nome de um grupo que foi anteriormente criado e excluído, o novo grupo receberá automaticamente todos os direitos e permissões dados ao grupo na primeira criação.
Está(ão) correta(s) a(s) afirmativa(s):
I - Uma conta de usuário, uma vez criada, não pode ser renomeada.
II - Um grupo local pode ser excluído mesmo que ele apresente usuários associados.
III - Se um grupo local de usuários for criado com o mesmo nome de um grupo que foi anteriormente criado e excluído, o novo grupo receberá automaticamente todos os direitos e permissões dados ao grupo na primeira criação.
Está(ão) correta(s) a(s) afirmativa(s):
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9255
Redes de Computadores
Para estações com sistema operacional Windows 98 e Linux, é possível definir um arquivo local de configurações que contém informações sobre nomes de domínios e máquinas e seus respectivos endereços IP. Este arquvo é normalmente usado como uma alternativa ou mesmo como uma complementação à consulta ao servidor de resolução de nomes. Embora se localize em diretórios diferentes nas duas plataformas, este arquivo apresenta o nome:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9254
Sistemas Operacionais
São feitas a seguir três afirmativas sobre compartilhamentos criados em um servidor com Microsoft Windows NT 4.0 Server, considerando instalação padrão em português.
I - Um usuário de um outro computador da rede, rodando Windows e conectado ao domínio, pode constatar a existência de compartilhamentos no servidor, visualizandos-os no ambiente de rede, mesmo que não tenha permissões de acesso para o seu conteúdo, acesso este que lhe será negado se tentar visualizar o conteúdo do compartilhamento.
II - É possível definir compartilhamentos ocultos, que não aparecem no ambiente de rede dos outros computadores da rede, terminando o nome do compartilhamento por um sinal $, como em privativo$.
III - É possível definir, no momento da criação de um compartilhamento, uma data e hora para sua expiração, de forma que o compartilhamento seja automaticamente desativado pelo servidor quando a data/hora do sistema for igual ou posterior à data/hora da expiração.
Está(ão) correta(s) a(s) afirmativa(s):
I - Um usuário de um outro computador da rede, rodando Windows e conectado ao domínio, pode constatar a existência de compartilhamentos no servidor, visualizandos-os no ambiente de rede, mesmo que não tenha permissões de acesso para o seu conteúdo, acesso este que lhe será negado se tentar visualizar o conteúdo do compartilhamento.
II - É possível definir compartilhamentos ocultos, que não aparecem no ambiente de rede dos outros computadores da rede, terminando o nome do compartilhamento por um sinal $, como em privativo$.
III - É possível definir, no momento da criação de um compartilhamento, uma data e hora para sua expiração, de forma que o compartilhamento seja automaticamente desativado pelo servidor quando a data/hora do sistema for igual ou posterior à data/hora da expiração.
Está(ão) correta(s) a(s) afirmativa(s):
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9253
Redes de Computadores
Em uma rede com TCP/IP, qual dos seguintes itens deve ser verificado se a rede não for capaz de mapear o nome de um servidor do Microsoft Windows NT Sever 4.0, considerando instalação padrão em português, para o correspondente endereço IP?
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9252
Programação
A respeito das tecnologias utilizadas na Internet, é correto afirmar que:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9250
Noções de Informática
Sobre as ferramentas do Microsoft Office 2000 Professional, considerando instalação padrão em português, assinale a afirmativa INCORRETA.
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9249
Redes de Computadores
Qual das opções abaixo apresenta um padrão utilizado para definir como os correios eletrônicos devem ser formatados (definindo, por exemplo, o conjunto de content-types permitidos)de modo que eles possam ser transferidos através de diferentes sistemas de e-mail?
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9247
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
The adjective "solar" (line 34) derives from the noun "sun". Check the item in which there is the same adjective/noun relationship.
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9246
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
The only option in which the words ARE NOT synonymous in the text is:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9245
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
Mark the correct statement concerning the ideas expressed in Paragraphs 6 and 7.
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9244
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
In the sentence "These include the growth rate of consumption, and estimates of how much of the remaining resources can be economically recovered." (lines 47-49), "these" refers to:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9243
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
According to Paragraph 4, the "ideal energy source":
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9242
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
A "pollution-free" energy source (line 27) means an energy source that is free of pollution. Check the option in which the phrase is also correctly explained.
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9241
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
In the sentence "since this is a key to making their products more competitive." (lines 24-25), the word "since":
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9240
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
In "Industries that produce or use energy continually look for ways to improve efficien," (lines 23-24), "look for" can be correctly substituted by:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9239
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
It is possible to deduce from lines 13-18 that:
Ano: 2006
Banca:
CESGRANRIO
Órgão:
Transpetro
Prova:
CESGRANRIO - 2006 - Transpetro - Auxiliar Técnico de Informática |
Q9238
Inglês
Texto associado
What are the best energy sources? "Best" depends
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
on many factors - how the energy is being used, where
it is being used, what energy sources are available,
which sources are most convenient and reliable, which
5 are easiest to use, what each costs, and the effects on
public safety, health, and the environment. Making smart
energy choices means understanding resources and their
relative costs and benefits.
Some energy sources have advantages for specific
10 uses or locations. For example, fuels from petroleum
are well suited for transportation because they pack a
lot of energy in a small space and are easily transported
and stored. Small hydroelectric installations are a good
solution for supplying power or mechanical energy close
15 to where it is used. Coal is widely used for power
generation in many fast-developing countries - including
China, India, and many others - because domestic
supplies are readily available.
Efficiency is an important factor in energy costs.
20 How efficiently can the energy be produced, delivered,
and used? How much energy value is lost in that process,
and how much ends up being transformed into useful
work? Industries that produce or use energy continually
look for ways to improve efficiency, since this is a key to
25 making their products more competitive.
The ideal energy source - cheap, plentiful, and
pollution-free - may prove unattainable in our lifetime,
but that is the ultimate goal. The energy industry is
continuing to improve its technologies and practices, to
30 produce and use energy more efficiently and cleanly.
Energy resources are often categorized as
renewable or nonrenewable.
Renewable energy resources are those that can be
replenished quickly - examples are solar power,
35 biomass, geothermal, hydroelectric, wind power, and
fast-reaction nuclear power. They supply about seven
percent of energy needs in the United States; the other
93 percent comes from nonrenewables. The two largest
categories of renewable energy now in use in the U.S.
40 are biomass - primarily wood wastes that are used by
the forest products industry to generate electricity and
heat - and hydroelectricity.
Nonrenewable energy resources include coal, oil,
natural gas, and uranium-235, which is used to fuel
45 slow-reaction nuclear power. Projections of how long a
nonrenewable energy resource will last depend on many
changeable factors. These include the growth rate of
consumption, and estimates of how much of the remaining
resources can be economically recovered. New exploration
50 and production technologies often increase the ability of
producers to locate and recover resources. World
reserves of fossil energy are projected to last for many
more decades - and, in the case of coal, for centuries.
In: http://www.classroom-energy.org/teachers/energy_tour/pg5.html
The main purpose of this text is to:
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