Mechanical Engineering Fourth Year Exam Marks Distribution
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Questions and Answers

What is the primary purpose of failure analysis?

  • To study the different types of materials
  • To analyze the effects of failure on the environment
  • To predict when a material will fail
  • To determine the root cause of a material's failure (correct)

    • Which of the following is NOT a common cause of material failure according to the text?

  • Stress, impact, and frictional loading
  • Low pressure environment (correct)
  • High temperature environment
  • Corrosive environment

    • What is one of the examples of operating conditions that frequently cause material failure according to the text?

  • Electrical conductivity
  • Temperature changes (correct)
  • Vibration frequency
  • Chemical composition

    • Which chapter in Dr. Reham Reda Abbas' course covers 'Failure Due To Overload'?

    <p>Chapter 3</p> Signup and view all the answers

    What are examples of harsh environments that commonly induce material failure according to the text?

    <p>Corrosive environment, high temperature environment</p> Signup and view all the answers

    What is the process of failure analysis according to the text?

    <p>Collecting data and analyzing it to determine the root cause of a failure</p> Signup and view all the answers

    Which of the following is the first critical step in the failure analysis procedure?

    <p>Detection and collection of data</p> Signup and view all the answers

    What can metallographic examination reveal?

    <p>Depth of hardening and grain size</p> Signup and view all the answers

    Which of the following is NOT listed as a failure cause?

    <p>Corrosion resistance problems</p> Signup and view all the answers

    What is a consideration in selecting appropriate processing for materials?

    <p>Recrystallization affecting strength</p> Signup and view all the answers

    What occurs in welding processes?

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

    What is involved in correct design to prevent failures?

    <p>Avoiding stress raisers</p> Signup and view all the answers

    What is used to analyze the phases, inclusions, and corrosion products in materials?

    <p>Energy dispersive X-ray spectroscopy (SEM/EDX)</p> Signup and view all the answers

    What causes quenched and tempered materials to lose strength?

    <p>Recrystallization affecting strength</p> Signup and view all the answers

    1

    <p>Improper or lack of inspection and quality control.</p> Signup and view all the answers

    Which process may create gas porosity and segregation?

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

    In failure analysis, environmental conditions and operating loads are often the primary causes leading to a material’s failure.

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

    Stress, impact, and frictional loading are examples of operating conditions that frequently cause material failure.

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

    Distortion is one of the failure modes due to overload as mentioned in the text.

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

    Failure analysis is the process of collecting data and analyzing it to determine the root cause of a failure.

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

    Quenched and tempered materials lose strength due to stress concentration and fracture toughness.

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

    Metallographic examination can reveal information about the phases, inclusions, and corrosion products in materials.

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

    Improper material selection is not a common cause of material failure according to the text?

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

    Cold working and forging do not create cracks, flaws, and distortion in materials according to the text?

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

    The primary purpose of failure analysis is to identify the possible root causes and the failure mechanism?

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

    Quenched and tempered materials do not lose strength at higher temperatures according to the text?

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

    Welding does not create gas porosity and cracks in materials?

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

    Fatigue striations and fracture modes cannot be detected using scanning electron microscope (SEM) according to the text?

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

    Proper material selection can prevent many failures according to the text?

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

    Inadequate environmental control is not a common failure cause according to the text?

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

    Metallographic examination cannot reveal depth of hardening, grain size, phase present, non-metallic inclusions, and porosities according to the text?

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

    Correct design does not involve designing for maximum stress including safety factor according to the text?

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

    Study Notes

    Purpose and Causes of Failure Analysis

    • The primary purpose of failure analysis is to identify the possible root causes and the failure mechanism.
    • Environmental conditions and operating loads are often the primary causes leading to a material’s failure.
    • Stress, impact, and frictional loading are examples of operating conditions that frequently cause material failure.

    Material Failure Modes

    • Distortion is one of the failure modes due to overload.

    Material Selection and Processing

    • Proper material selection can prevent many failures.
    • Inadequate environmental control is a common failure cause.
    • Cold working and forging can create cracks, flaws, and distortion in materials.
    • Welding can create gas porosity and cracks in materials.

    Material Properties and Analysis

    • Quenched and tempered materials lose strength due to stress concentration and fracture toughness.
    • Metallographic examination can reveal information about the phases, inclusions, and corrosion products in materials.
    • Metallographic examination can reveal depth of hardening, grain size, phase present, non-metallic inclusions, and porosities.
    • Scanning electron microscope (SEM) can detect fatigue striations and fracture modes.

    Design and Failure Prevention

    • Correct design involves designing for maximum stress including safety factor.
    • Proper design can prevent many failures.

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    Description

    Prepare for the Mechanical Engineering fourth-year exam by understanding the marks distribution for tutorials, year work, oral/practical exams, and final exams. Get insights into the exam time, lab marks distribution, and contact hours with Dr. Reham Reda Abbas. Explore the contents of Chapter 1: Failure Analysis- An Overview.

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