Mechanical Engineering Department Marks and Hours Distribution Quiz
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Questions and Answers

What is a potential cause of failure mentioned in the text?

  • Service environment consideration
  • Correct processing
  • Fabrication defects (correct)
  • Proper material selection

    • Which method can be used to evaluate the magnitude of stress based on the given text?

  • Visual examination of the damage
  • Metallographic examination
  • Crack initiation and fracture modes
  • Loading situation (correct)

    • What is the first critical step in the failure analysis procedure?

  • Detection and data collection (correct)
  • Select samples and samples preparation
  • Examine and analyze
  • Photograph the failure in several angles before destruction

    • What is a consideration for selecting appropriate materials, as per the text?

    <p>Temperature range of operation</p> Signup and view all the answers

    What is a potential effect of welding, as mentioned in the text?

    <p>Gas porosity and segregation</p> Signup and view all the answers

    What is the primary focus of failure analysis?

    <p>Determining the root cause of a failure</p> Signup and view all the answers

    Which of the following is NOT mentioned as an example of a harsh environment inducing failure?

    <p>Chemically stable environment</p> Signup and view all the answers

    Which chapter of the syllabus covers 'Failure Due To Overload'?

    <p>2.1 Distortion</p> Signup and view all the answers

    What are some examples of operating conditions that frequently cause material failure?

    <p>Stress, impact, and frictional loading</p> Signup and view all the answers

    What does the process of failure analysis involve?

    <p>Determining the root cause of a failure</p> Signup and view all the answers

    In the context of creep, what is the purpose of a creep test?

    <p>To measure the strain as a function of time at a constant stress and temperature</p> Signup and view all the answers

    What are some examples of components that experience creep phenomenon?

    <p>Boilers, gas turbine engines, and ovens</p> Signup and view all the answers

    Why are materials with high melting temperatures often selected for applications involving sustained stress at high temperatures?

    <p>To withstand the conditions without experiencing creep deformation</p> Signup and view all the answers

    What does the slope of the strain vs. time curve in a creep test represent?

    <p>The strain rate or creep rate of the material</p> Signup and view all the answers

    Why do ceramics have a very high resistance to deformation by creep?

    <p>Because of their characteristically high melting temperatures</p> Signup and view all the answers

    What is creep failure?

    <p>The permanent dimensional change of a material subjected to a constant stress, usually greater than the yield stress</p> Signup and view all the answers

    What is the significance of temperature in creep?

    <p>Creep is only significant when the temperature is greater than 0.4 Tm</p> Signup and view all the answers

    How does creep occur?

    <p>By atomic diffusion causing elongation of the grain in the direction parallel to the applied stress</p> Signup and view all the answers

    What can result from sufficient strain or creep in a material?

    <p>Fracture</p> Signup and view all the answers

    At what temperature is creep significant?

    <p>Greater than 0.4 Tm</p> Signup and view all the answers

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