Hysteresis Loss in Alternating Current

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What is the term for the process of demagnetizing a substance by reversing the direction of the current?

Magnetization

Demagnetization

Coercive force

Hysteresis (correct)

What happens to the magnetic flux density when the magnetic field strength is increased from zero to one?

It increases (correct)

It decreases

It remains constant

It becomes zero

What is the point at which the magnetic flux density remains constant called?

Retentivity point

Coercive force

Saturation point (correct)

Demagnetization point

What is the amount of force required to remove a material's retentivity called?

Coercive force Signup and view all the answers

What is the primary cause of hysteresis loss in soft magnetic materials?

The friction of molecules in the core Signup and view all the answers

What is the energy loss caused by hysteresis in electric machines' ferromagnetic cores?

Hysteresis loss Signup and view all the answers

What is the term for the material's ability to retain some magnetism when the magnetic field is zero?

Retentivity Signup and view all the answers

What is the term for the electric charge that accumulates in certain solid materials in response to applied mechanical stress?

Piezoelectricity Signup and view all the answers

What is the result of the continually changing direction of the magnetic field in soft magnetic materials?

The migration of molecules in the core Signup and view all the answers

What is the energy loss induced by the friction of molecules in the core of soft magnetic materials?

Hysteresis Loss Signup and view all the answers

What type of materials exhibit piezoelectricity?

Crystals and ceramics Signup and view all the answers

What is the term for the study of the magnetic properties of materials using the theory of ferromagnetic hysteresis?

Magnetic Properties Modeling Signup and view all the answers

What is the primary application of soft magnetic materials?

Construction of cores of electrical rotating machines Signup and view all the answers

What is the main reason for large hysteresis loss in hard magnetic materials?

Large crystal defects and imperfections Signup and view all the answers

Which of the following is a characteristic of hard magnetic materials?

They have high Coercivity and retentivity Signup and view all the answers

What is the term for the lagging of magnetization of ferromagnetic materials behind the magnetic field?

Hysteresis Signup and view all the answers

Which of the following is an example of a hard magnetic material?

Alnico alloy Signup and view all the answers

What is the term for the maximum magnetic field strength that a material can withstand?

Coercivity Signup and view all the answers