Foram encontradas 40 questões.
A técnica de virtualização de máquinas, em que o sistema operacional é modificado para funcionar na máquina
virtual com a intenção de minimizar o tempo de execução
requerido para realizar operações que seriam difíceis em
um ambiente virtual, recebe o nome de:
Provas
Questão presente nas seguintes provas
No sistema operacional Windows 10, o UAC (User
Account Control) tem por objetivo
Provas
Questão presente nas seguintes provas
O seguinte comando foi executado em um terminal do
sistema operacional Linux:
df -h
obtendo-se o seguinte resultado (parcial):
Para se obter na saída padrão apenas a(s) linha(s) de dados relativa(s) ao dispositivo /dev/xvda2, além da linha de títulos, o seguinte comando pode ser utilizado:
df -h
obtendo-se o seguinte resultado (parcial):
![Enunciado 3066086-1](/images/concursos/8/c/6/8c626184-5be2-2855-ef2b-8d112d74e48a.png)
Para se obter na saída padrão apenas a(s) linha(s) de dados relativa(s) ao dispositivo /dev/xvda2, além da linha de títulos, o seguinte comando pode ser utilizado:
Provas
Questão presente nas seguintes provas
No sistema operacional Linux, o comando
find / -name arq1.txt -exec tail {} ;
tem como efeito localizar
Provas
Questão presente nas seguintes provas
Algumas operações de recuperação de instalações do
sistema operacional Linux podem requerer a utilização
do comando chroot. Este comando tem por finalidade
Provas
Questão presente nas seguintes provas
![Enunciado 3066133-1](/images/concursos/b/a/b/bab4c990-d0cc-6df6-2044-52469c438edc.png)
Mining trucks are monstrous machines that guzzle fuel
at a scarcely believable rate. Weighing 220 tonnes, they can
get through 134 litres of diesel every hour. Little wonder then
that mining companies are focusing their attention on these
vehicles as the first step to reducing their carbon footprint.
Anglo American, in collaboration with several partners, is
retrofitting a mining haul truck with hydrogen power technology.
A first of its kind, the monster mining vehicle is being piloted
in Limpopo, South Africa, at the firm’s Mogalakwena platinum
mine. Due to be launched early 2022, the truck will be hybrid,
with a hydrogen fuel cell providing roughly half of the power
and a battery pack the other half.
Instead of having a tank of diesel that powers the motor,
hydrogen enters the fuel cell and mixes with oxygen to create
water in a chemical reaction catalysed by platinum, which
generates the electricity needed to power the motors that
drive the wheels. By rolling out this technology across its
global truck fleet, Anglo American says it will be “taking the
equivalent of half a million diesel cars ‘off the road”.
The construction sector, which includes mining, accounted
for 39% of energy-related CO2
emissions in 2017, according
to Davide Sabbadin, from the European Environmental
Bureau. He says the sector will need to reduce its energy
consumption by a third if it hopes to be compatible with the
Paris Agreement. “While electric-powered vehicles, generally
speaking, are less damaging to the environment than internal
combustion engines on a life cycle analysis, this does not
mean that they are green,” he says. It all hinges on how the
hydrogen is produced. Some hydrogen is created using fossil
fuels, which of course means there are substantial emissions
as a result. “We should refrain from presenting hydrogen as a
technological solution to all problems… all forms of hydrogen
come at an environmental cost – water use, impacts on
nature,” says Mr Sabbadin.
(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)
Provas
Questão presente nas seguintes provas
![Enunciado 3066132-1](/images/concursos/b/a/b/bab4c990-d0cc-6df6-2044-52469c438edc.png)
Mining trucks are monstrous machines that guzzle fuel
at a scarcely believable rate. Weighing 220 tonnes, they can
get through 134 litres of diesel every hour. Little wonder then
that mining companies are focusing their attention on these
vehicles as the first step to reducing their carbon footprint.
Anglo American, in collaboration with several partners, is
retrofitting a mining haul truck with hydrogen power technology.
A first of its kind, the monster mining vehicle is being piloted
in Limpopo, South Africa, at the firm’s Mogalakwena platinum
mine. Due to be launched early 2022, the truck will be hybrid,
with a hydrogen fuel cell providing roughly half of the power
and a battery pack the other half.
Instead of having a tank of diesel that powers the motor,
hydrogen enters the fuel cell and mixes with oxygen to create
water in a chemical reaction catalysed by platinum, which
generates the electricity needed to power the motors that
drive the wheels. By rolling out this technology across its
global truck fleet, Anglo American says it will be “taking the
equivalent of half a million diesel cars ‘off the road”.
The construction sector, which includes mining, accounted
for 39% of energy-related CO2
emissions in 2017, according
to Davide Sabbadin, from the European Environmental
Bureau. He says the sector will need to reduce its energy
consumption by a third if it hopes to be compatible with the
Paris Agreement. “While electric-powered vehicles, generally
speaking, are less damaging to the environment than internal
combustion engines on a life cycle analysis, this does not
mean that they are green,” he says. It all hinges on how the
hydrogen is produced. Some hydrogen is created using fossil
fuels, which of course means there are substantial emissions
as a result. “We should refrain from presenting hydrogen as a
technological solution to all problems… all forms of hydrogen
come at an environmental cost – water use, impacts on
nature,” says Mr Sabbadin.
(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)
Provas
Questão presente nas seguintes provas
![Enunciado 3066131-1](/images/concursos/b/a/b/bab4c990-d0cc-6df6-2044-52469c438edc.png)
Mining trucks are monstrous machines that guzzle fuel
at a scarcely believable rate. Weighing 220 tonnes, they can
get through 134 litres of diesel every hour. Little wonder then
that mining companies are focusing their attention on these
vehicles as the first step to reducing their carbon footprint.
Anglo American, in collaboration with several partners, is
retrofitting a mining haul truck with hydrogen power technology.
A first of its kind, the monster mining vehicle is being piloted
in Limpopo, South Africa, at the firm’s Mogalakwena platinum
mine. Due to be launched early 2022, the truck will be hybrid,
with a hydrogen fuel cell providing roughly half of the power
and a battery pack the other half.
Instead of having a tank of diesel that powers the motor,
hydrogen enters the fuel cell and mixes with oxygen to create
water in a chemical reaction catalysed by platinum, which
generates the electricity needed to power the motors that
drive the wheels. By rolling out this technology across its
global truck fleet, Anglo American says it will be “taking the
equivalent of half a million diesel cars ‘off the road”.
The construction sector, which includes mining, accounted
for 39% of energy-related CO2
emissions in 2017, according
to Davide Sabbadin, from the European Environmental
Bureau. He says the sector will need to reduce its energy
consumption by a third if it hopes to be compatible with the
Paris Agreement. “While electric-powered vehicles, generally
speaking, are less damaging to the environment than internal
combustion engines on a life cycle analysis, this does not
mean that they are green,” he says. It all hinges on how the
hydrogen is produced. Some hydrogen is created using fossil
fuels, which of course means there are substantial emissions
as a result. “We should refrain from presenting hydrogen as a
technological solution to all problems… all forms of hydrogen
come at an environmental cost – water use, impacts on
nature,” says Mr Sabbadin.
(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)
Provas
Questão presente nas seguintes provas
( )
Mining trucks are monstrous machines that guzzle fuel
at a scarcely believable rate. Weighing 220 tonnes, they can
get through 134 litres of diesel every hour. Little wonder then
that mining companies are focusing their attention on these
vehicles as the first step to reducing their carbon footprint.
Anglo American, in collaboration with several partners, is
retrofitting a mining haul truck with hydrogen power technology.
A first of its kind, the monster mining vehicle is being piloted
in Limpopo, South Africa, at the firm’s Mogalakwena platinum
mine. Due to be launched early 2022, the truck will be hybrid,
with a hydrogen fuel cell providing roughly half of the power
and a battery pack the other half.
Instead of having a tank of diesel that powers the motor,
hydrogen enters the fuel cell and mixes with oxygen to create
water in a chemical reaction catalysed by platinum, which
generates the electricity needed to power the motors that
drive the wheels. By rolling out this technology across its
global truck fleet, Anglo American says it will be “taking the
equivalent of half a million diesel cars ‘off the road”.
The construction sector, which includes mining, accounted
for 39% of energy-related CO2
emissions in 2017, according
to Davide Sabbadin, from the European Environmental
Bureau. He says the sector will need to reduce its energy
consumption by a third if it hopes to be compatible with the
Paris Agreement. “While electric-powered vehicles, generally
speaking, are less damaging to the environment than internal
combustion engines on a life cycle analysis, this does not
mean that they are green,” he says. It all hinges on how the
hydrogen is produced. Some hydrogen is created using fossil
fuels, which of course means there are substantial emissions
as a result. “We should refrain from presenting hydrogen as a
technological solution to all problems… all forms of hydrogen
come at an environmental cost – water use, impacts on
nature,” says Mr Sabbadin.
(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)
Provas
Questão presente nas seguintes provas
![Enunciado 3066073-1](/images/concursos/4/a/c/4acc673b-7052-0f29-e020-0436b603c0b9.png)
Mining trucks are monstrous machines that guzzle fuel
at a scarcely believable rate. Weighing 220 tonnes, they can
get through 134 litres of diesel every hour. Little wonder then
that mining companies are focusing their attention on these
vehicles as the first step to reducing their carbon footprint.
Anglo American, in collaboration with several partners, is
retrofitting a mining haul truck with hydrogen power technology.
A first of its kind, the monster mining vehicle is being piloted
in Limpopo, South Africa, at the firm’s Mogalakwena platinum
mine. Due to be launched early 2022, the truck will be hybrid,
with a hydrogen fuel cell providing roughly half of the power
and a battery pack the other half.
Instead of having a tank of diesel that powers the motor,
hydrogen enters the fuel cell and mixes with oxygen to create
water in a chemical reaction catalysed by platinum, which
generates the electricity needed to power the motors that
drive the wheels. By rolling out this technology across its
global truck fleet, Anglo American says it will be “taking the
equivalent of half a million diesel cars ‘off the road”.
The construction sector, which includes mining, accounted
for 39% of energy-related CO2
emissions in 2017, according
to Davide Sabbadin, from the European Environmental
Bureau. He says the sector will need to reduce its energy
consumption by a third if it hopes to be compatible with the
Paris Agreement. “While electric-powered vehicles, generally
speaking, are less damaging to the environment than internal
combustion engines on a life cycle analysis, this does not
mean that they are green,” he says. It all hinges on how the
hydrogen is produced. Some hydrogen is created using fossil
fuels, which of course means there are substantial emissions
as a result. “We should refrain from presenting hydrogen as a
technological solution to all problems… all forms of hydrogen
come at an environmental cost – water use, impacts on
nature,” says Mr Sabbadin.
(Jesse Preyser. www.bbc.com, 21.12.2021. Adaptado)
Provas
Questão presente nas seguintes provas
Cadernos
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