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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?

Resistivity decreases to zero Signup and view all the answers

Which field commonly utilizes MRI for diagnostic purposes?

Medical field Signup and view all the answers

What do hard magnetic materials contribute to in motors?

Continuous magnetic field Signup and view all the answers

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

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

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

Low energy losses Signup and view all the answers

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

To reduce the hysteresis energy losses Signup and view all the answers

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

Soft magnetic materials Signup and view all the answers

What are hard magnetic materials primarily used for?

Permanent magnets Signup and view all the answers

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

High resistance to demagnetization Signup and view all the answers

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

High resistance to demagnetization Signup and view all the answers

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

Increase in electrical resistivity and increased eddy currents Signup and view all the answers

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

Thin and narrow hysteresis loop Signup and view all the answers

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

Increasing electrical resistivity and high initial permeability Signup and view all the answers