Properties of Electric Materials - Electrical Engineering Course
16 Questions
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Properties of Electric Materials - Electrical Engineering Course

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Questions and Answers

What is a common application of hard magnetic materials in audio systems?

  • Clocks
  • Hearing aids (correct)
  • High-speed magnetically levitated trains
  • Superconducting magnets for scientific research

    • What is a major difficulty in the application of superconductors?

  • Use in MRI for diagnostic purposes
  • High-speed switching and signal transmission for computers
  • Attaining and maintaining extremely low temperatures (correct)
  • Development of new generation superconductors

    • In which application are superconducting magnets commonly used?

  • High-speed magnetically levitated trains (correct)
  • Chemical analysis of body tissues
  • Computer peripherals
  • Clocks

    • What is the primary electrical phenomenon associated with superconductivity?

    <p>Resistivity decreases to zero</p> Signup and view all the answers

    Which field commonly utilizes MRI for diagnostic purposes?

    <p>Medical field</p> Signup and view all the answers

    What do hard magnetic materials contribute to in motors?

    <p>Continuous magnetic field</p> Signup and view all the answers

    What is the importance of the size and shape of the hysteresis curve for ferro- and ferrimagnetic materials?

    <p>It represents magnetic energy loss per unit volume of material per magnetization-demagnetization cycle</p> Signup and view all the answers

    What does the relative area within the hysteresis loop indicate for soft magnetic materials?

    <p>Low energy losses</p> Signup and view all the answers

    What is the main reason for minimizing energy losses in soft magnetic materials?

    <p>To reduce the hysteresis energy losses</p> Signup and view all the answers

    Which type of magnetic materials are used in devices subjected to alternating magnetic fields with low energy losses?

    <p>Soft magnetic materials</p> Signup and view all the answers

    What are hard magnetic materials primarily used for?

    <p>Permanent magnets</p> Signup and view all the answers

    What is a characteristic of hard magnetic materials in terms of demagnetization resistance?

    <p>High resistance to demagnetization</p> Signup and view all the answers

    What is the main factor contributing to high hysteresis energy losses in hard magnetic materials?

    <p>High resistance to demagnetization</p> Signup and view all the answers

    What results from magnetic field changes in time in relation to electrical resistivity and eddy currents?

    <p>Increase in electrical resistivity and increased eddy currents</p> Signup and view all the answers

    What must be characteristic of soft magnetic materials for minimizing energy losses?

    <p>Thin and narrow hysteresis loop</p> Signup and view all the answers

    What is required for minimizing energy losses in soft magnetic materials?

    <p>Increasing electrical resistivity and high initial permeability</p> Signup and view all the answers

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