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Q2281478 Engenharia Mecânica

A respeito dos cuidados de inspeção que devem ocorrer antes, durante e após a soldagem, julgue o item a seguir. 


Após a soldagem, são aplicados alguns ensaios não destrutivos, como o ensaio de estanqueidade, que permite verificar a qualidade da junta soldada.

Alternativas
Q2281477 Engenharia Mecânica

A respeito dos cuidados de inspeção que devem ocorrer antes, durante e após a soldagem, julgue o item a seguir. 


O controle radiográfico, em que a peça a controlar é submetida à incidência de raios X ou raios gama, é a melhor opção de controle para a detecção de inclusões e poros após a soldagem.

Alternativas
Q2281475 Engenharia Mecânica

Com referência à metalurgia da soldagem e aos defeitos de origem metalúrgica, julgue o item a seguir. 


Entre os cinco tipos de macroestruturas de solda, a mais resistente à propagação de trincas é aquela em que os grãos colunares se encontram no centro do cordão, formando uma estrutura em ziguezague.

Alternativas
Q2281474 Engenharia Mecânica

Com referência à metalurgia da soldagem e aos defeitos de origem metalúrgica, julgue o item a seguir. 


No metal de solda, o teor de carbono — principal elemento químico na determinação da microestrutura do aço — deve estar entre 0,05% e 0,15%, para evitar a formação de bainita.

Alternativas
Q2281473 Engenharia Mecânica

Com referência à metalurgia da soldagem e aos defeitos de origem metalúrgica, julgue o item a seguir. 


A poça de fundição no formato de gota ocorre quando a velocidade da solidificação é igual à velocidade de soldagem.

Alternativas
Q2281472 Engenharia Mecânica

Com referência à metalurgia da soldagem e aos defeitos de origem metalúrgica, julgue o item a seguir. 


O tamanho de grão do metal base interfere na estrutura final da solda: quanto maior for o tamanho de grão, mais grosseira será a solda.  

Alternativas
Q2281471 Engenharia Mecânica

Acerca de ensaios não destrutivos, julgue o item que se segue. 


A inspeção termográfica é uma técnica de ensaio não destrutivo que utiliza pulsos ultrassônicos para localização dos defeitos.

Alternativas
Q2281470 Engenharia Mecânica

Acerca de ensaios não destrutivos, julgue o item que se segue. 


O ensaio de líquido penetrante é um ensaio volumétrico que permite avaliar todo o volume de uma peça.

Alternativas
Q2281469 Engenharia Mecânica

Acerca de ensaios não destrutivos, julgue o item que se segue. 


O ensaio de emissão acústica é usado quando se deseja analisar o comportamento dinâmico de um defeito, assim como registrar sua localização. 

Alternativas
Q2281468 Engenharia Mecânica

Acerca de ensaios não destrutivos, julgue o item que se segue. 


O ensaio de correntes parasitas somente pode ser aplicado a materiais ferromagnéticos.

Alternativas
Q2281467 Engenharia Mecânica

Acerca de ensaios não destrutivos, julgue o item que se segue. 


O ensaio de líquido penetrante pode ser utilizado adequadamente para análise de vazamento em tubos e tanques.

Alternativas
Q2281466 Engenharia Mecânica

Acerca de ensaios não destrutivos, julgue o item que se segue. 


A inspeção visual é considerada um ensaio não destrutivo.

Alternativas
Q2281465 Engenharia Mecânica

Julgue o seguinte item, relativo aos processos de soldagem.


No processo de soldagem MIG/MAG, a soldagem pode ser executada em todas as direções e ocorre a formação de escória.  

Alternativas
Q2281463 Engenharia Mecânica

Julgue o seguinte item, relativo aos processos de soldagem.


Quando é empregada fonte de energia mecânica no processo de soldagem, o calor é gerado por atrito ou por deformação plástica do material.

Alternativas
Q2281462 Engenharia Mecânica

Julgue o seguinte item, relativo aos processos de soldagem.


A soldagem por fusão não apresenta zona termicamente afetada. 

Alternativas
Q2281461 Engenharia Mecânica

Julgue o seguinte item, relativo aos processos de soldagem.


A soldagem no estado sólido ocorre com a presença do metal fundido na união.

Alternativas
Q2281249 Inglês
Text CB1A2-I

        Oppenheimer’s brief advance into astrophysics began with a 1938 paper about neutron stars, which continued in a 1939 installment that further incorporated the principles of Einstein’s general theory of relativity. He then published a third paper on black holes on September 1st, 1939—but at the time, it was scarcely noticed because this was the very day Germany invaded Poland, launching World War II. Oppenheimer never wrote on the topic again.
        Even if it hadn’t been overshadowed by war, Oppenheimer’s work on neutron stars and black holes “was not understood to be terribly significant at the time,” says Cathryn Carson, a historian of science at the University of California, Berkeley.
        Each paper was written with a different member of the swarm of graduate students that Oppenheimer carefully cultivated. These protégés facilitated his ability to jump between research topics—and ultimately, helped him develop some of his most important contributions to physics.
        Oppenheimer’s climactic third paper, written with his student Hartland Snyder, explores the implications of general relativity on the universe’s most massive stars. Although the physicists needed to include some assumptions to simplify the question, they determined that a large enough star would gravitationally collapse indefinitely—and within a finite amount of time, meaning that the objects we now know as black holes could exist.

Internet: <scientificamerican.com> (adapted)

Based on the vocabulary and linguistic aspects of text CB1A2-I, judge the following item.


Graduate students are people studying for a master’s degree or doctorate.

Alternativas
Q2281248 Inglês
Text CB1A2-I

        Oppenheimer’s brief advance into astrophysics began with a 1938 paper about neutron stars, which continued in a 1939 installment that further incorporated the principles of Einstein’s general theory of relativity. He then published a third paper on black holes on September 1st, 1939—but at the time, it was scarcely noticed because this was the very day Germany invaded Poland, launching World War II. Oppenheimer never wrote on the topic again.
        Even if it hadn’t been overshadowed by war, Oppenheimer’s work on neutron stars and black holes “was not understood to be terribly significant at the time,” says Cathryn Carson, a historian of science at the University of California, Berkeley.
        Each paper was written with a different member of the swarm of graduate students that Oppenheimer carefully cultivated. These protégés facilitated his ability to jump between research topics—and ultimately, helped him develop some of his most important contributions to physics.
        Oppenheimer’s climactic third paper, written with his student Hartland Snyder, explores the implications of general relativity on the universe’s most massive stars. Although the physicists needed to include some assumptions to simplify the question, they determined that a large enough star would gravitationally collapse indefinitely—and within a finite amount of time, meaning that the objects we now know as black holes could exist.

Internet: <scientificamerican.com> (adapted)

Based on the vocabulary and linguistic aspects of text CB1A2-I, judge the following item.


The word “physicists” means “medical doctors”. 

Alternativas
Q2281247 Inglês
Text CB1A2-I

        Oppenheimer’s brief advance into astrophysics began with a 1938 paper about neutron stars, which continued in a 1939 installment that further incorporated the principles of Einstein’s general theory of relativity. He then published a third paper on black holes on September 1st, 1939—but at the time, it was scarcely noticed because this was the very day Germany invaded Poland, launching World War II. Oppenheimer never wrote on the topic again.
        Even if it hadn’t been overshadowed by war, Oppenheimer’s work on neutron stars and black holes “was not understood to be terribly significant at the time,” says Cathryn Carson, a historian of science at the University of California, Berkeley.
        Each paper was written with a different member of the swarm of graduate students that Oppenheimer carefully cultivated. These protégés facilitated his ability to jump between research topics—and ultimately, helped him develop some of his most important contributions to physics.
        Oppenheimer’s climactic third paper, written with his student Hartland Snyder, explores the implications of general relativity on the universe’s most massive stars. Although the physicists needed to include some assumptions to simplify the question, they determined that a large enough star would gravitationally collapse indefinitely—and within a finite amount of time, meaning that the objects we now know as black holes could exist.

Internet: <scientificamerican.com> (adapted)

Based on the vocabulary and linguistic aspects of text CB1A2-I, judge the following item.


The word “installment” (first sentence of the first paragraph) means, in the context of text CB1A2-I, “to make it ready to use”.

Alternativas
Q2281246 Inglês
Text CB1A2-I

        Oppenheimer’s brief advance into astrophysics began with a 1938 paper about neutron stars, which continued in a 1939 installment that further incorporated the principles of Einstein’s general theory of relativity. He then published a third paper on black holes on September 1st, 1939—but at the time, it was scarcely noticed because this was the very day Germany invaded Poland, launching World War II. Oppenheimer never wrote on the topic again.
        Even if it hadn’t been overshadowed by war, Oppenheimer’s work on neutron stars and black holes “was not understood to be terribly significant at the time,” says Cathryn Carson, a historian of science at the University of California, Berkeley.
        Each paper was written with a different member of the swarm of graduate students that Oppenheimer carefully cultivated. These protégés facilitated his ability to jump between research topics—and ultimately, helped him develop some of his most important contributions to physics.
        Oppenheimer’s climactic third paper, written with his student Hartland Snyder, explores the implications of general relativity on the universe’s most massive stars. Although the physicists needed to include some assumptions to simplify the question, they determined that a large enough star would gravitationally collapse indefinitely—and within a finite amount of time, meaning that the objects we now know as black holes could exist.

Internet: <scientificamerican.com> (adapted)

Based on the vocabulary and linguistic aspects of text CB1A2-I, judge the following item.


The word “overshadowed” (first sentence of the second paragraph) means, in the context of text CB1A2-I, “made less noticeable”. 

Alternativas
Respostas
501: C
502: C
503: C
504: E
505: E
506: C
507: E
508: E
509: C
510: E
511: C
512: C
513: E
514: C
515: E
516: E
517: C
518: E
519: E
520: C