Properties of Engineering Materials I - General Introduction
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Questions and Answers

What type of materials do electronic engineers search for?

  • Low conductivity materials
  • Materials for the fabrication and miniaturization of electronic devices (correct)
  • Materials for construction of roads and bridges
  • High strength materials for buildings
  • Why is it crucial for engineers to know the internal structure and engineering properties of materials?

  • To meet requirements for various applications (correct)
  • To increase material cost
  • To simplify material selection
  • To decrease material options
  • What can happen if systematic material selection based on required properties is not performed?

  • Potential disasters (correct)
  • Cost-saving opportunities
  • Easier material choices
  • Increase in the menu of materials
  • Why did a class of welded merchant ships suffer heavy losses during World War II?

    <p>Low fracture toughness of the steel welds</p> Signup and view all the answers

    Why are materials critical in the field of engineering according to the text?

    <p>Materials are the foundation of engineering</p> Signup and view all the answers

    What was the key issue leading to the high losses suffered by the welded merchant ships during World War II?

    <p>Low fracture toughness of steel welds</p> Signup and view all the answers

    What is a common reason for the failure of appliances made of plastic?

    <p>Low modulus of elasticity</p> Signup and view all the answers

    Which property of materials is typically related to a material's ability to withstand repeated loading without breaking?

    <p>Fatigue strength</p> Signup and view all the answers

    What common consequence occurs when aircraft use materials with lower fatigue strength?

    <p>Aircraft lost</p> Signup and view all the answers

    Which property relates to a material's resistance to gradual deformation under constant loading?

    <p>Creep strength</p> Signup and view all the answers

    What type of property would be most crucial for a material used in aircraft components subjected to rapid temperature changes?

    <p>Thermal expansion coefficient</p> Signup and view all the answers

    Which property of materials is associated with their ability to absorb energy when deformed elastically?

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

    What is the purpose of the compressor blades in a turbofan engine?

    <p>To compress the air before mixing it with fuel</p> Signup and view all the answers

    Why is density an important factor for the engine?

    <p>To reduce weight in order to carry more payload</p> Signup and view all the answers

    What material are composite blades made of to reduce weight in the engine?

    <p>Carbon-fibre reinforced polymers (CFRP)</p> Signup and view all the answers

    What application requires turbine blades to have high resistance to creep and oxidation?

    <p>Running at high temperatures in the engine</p> Signup and view all the answers

    Why are metallic leading edges used to clad composite blades?

    <p>To improve toughness</p> Signup and view all the answers

    Which material is used in the HP1 turbine blades for high resistance to creep and oxidation?

    <p>Nickel-based alloys</p> Signup and view all the answers

    What is the primary focus of mechanical engineers according to the text?

    <p>Searching for high temp materials for gas turbines and engines</p> Signup and view all the answers

    Based on the text, what is the main concern of electrical engineers?

    <p>Finding materials that are good conductors of electricity</p> Signup and view all the answers

    What do aerospace and automobile engineers prioritize?

    <p>Seeking materials with high strength-to weight ratios</p> Signup and view all the answers

    What is the main goal of engineering as defined in the ABET statement?

    <p>Developing ways to utilize materials and forces of nature for mankind's benefit</p> Signup and view all the answers

    Why do electrical engineers primarily seek materials with good conductivity?

    <p>To operate electrical devices at faster rates with minimal power losses</p> Signup and view all the answers

    What's a common objective for mechanical, electrical, aerospace, and automobile engineers?

    <p>Searching for materials with high strength-to weight ratios</p> Signup and view all the answers

    What type of material is high-carbon steel known for its high modulus and fracture toughness?

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

    Why is high yield strength important for the shaft of a screwdriver?

    <p>To resist bending and twisting</p> Signup and view all the answers

    Why is it mentioned that wood is still important but being replaced by PMMA?

    <p>PMMA is easier to fabricate than wood</p> Signup and view all the answers

    Which material is preferred for the handle of the screwdriver due to its low density and affordability?

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

    Why is a thin skin of rubber mentioned as possibly useful for the handle of the screwdriver?

    <p>To reduce the coefficient of friction</p> Signup and view all the answers

    What property of high-carbon steel makes it suitable for the blade of the screwdriver?

    <p>High hardness</p> Signup and view all the answers

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