GATE MT concept:creep PYQs & Answers — Page 2

Questions 11–14 of 14. Imported answers require independent review unless marked reviewed.

Topic practice 14 questionsPage 2 of 2

In a tensile creep test of a metal, Nabarro-Herring mechanism is favored over Coble mechanism for ____________.

Your answerChoose one option.

larger grain size and lower temperature

smaller grain size and higher temperature

larger grain size and higher temperature

smaller grain size and lower temperature

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Beach marks are commonly observed on the fractured surfaces of metals after a ____________.

Your answerChoose one option.

Creep test

Fatigue test

Impact test

Compression test

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Determine the correctness (or otherwise) of the following Assertion [A] and the Reason [R]

Assertion [A]: For a material exibiting Coble creep, a reduction in grain size results in a significant increase in creep rate Reason [R]: Grain boundaries act as a barrier to motion of dislocations

Your answerChoose one option.

Both [A] and [R] are true and [R] is the correct reason for [A]

Both [A] and [R] are true, but [R] is not the correct reason for [A]

Both [A] and [R] are false

[A] is true but [R] is false

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Both creep resistance and tensile strength of a metal can be enhanced by

Your answerChoose one option.

increase in the grain size

decrease in the grain size

addition of dispersoids

annealing

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GATE MT concept:creep PYQs

Question 17

Question 18

Question 27

Question 17