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WorksheetsUnit4_MS_Magnetic Materials
Total questions: 20
Worksheet time: 15mins
When the atomic magnetic moments are randomly oriented in a solid its magnetic behavior is termed as
anti-ferromagnetic
paramagnetic
ferromagnetic
Diamagnetic
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as
magnetostriction
magnetic hysteresis
magnetic expansion
magneto-calorisation
Soft magnetic materials are have
Large area of hysteresis loop
Medium area of hysteresis loop
Small area of hysteresis loop
None of these
Magnetic susceptibility in diamagnetic material is
Neutral
Negative
Positive
Zero
Soft magnetic material is
Steel
Copper
Bismuth
Iron
Interaction between neighboring dipoles is equal in ___ material
Ferromagnetic
Ferromagnetic
Antiferromagnetic
Paramagnetic
A soft magnetic material is having
High hysteresis loss
Copper loss
Low hysteresis loss
None of these
The direction of induced current in a conductor moving in a magnetic
Fleming’s left hand rule
Fleming’s right hand rule
Faraday’s law
Maxwell’s screw rule
The major cause of hum in transformer is due to insulating properties
Electromagnetic
Magnetostriction
Electrostriction
None of these
Hard ferrites are used for making
Electrical machinery
Transformer cores
Light weight permanent magnet
High frequency equipment
The resistivity of ferrites is ___ than that of ferromagnetic materials
Equal to
Higher
Lower
Very lower
Soft magnetic materials have low
Coercive force
Conductivity
Permeability
Resistivity
Which is non-magnetic material
Nickel
Cobalt
Aluminum
Gadolinium
Above Curie point
a ferromagnetic material becomes paramagnetic
a ferrite becomes an insulator
a insulating material becomes a ferrite
A diamagnetic material becomes a paramagnetic material.
Diamagnetic: Copper:: Ferromagnetic:
Iron
Lead
Air
Water
Diamagnetic : Paramagnetic::
Water: Air
Iron: Steel
Perm alloy: Super-alloy
Nickel: Cobalt.
Soft magnets are commonly employed in
Electric instruments
Motors
Transformer
All the above
For which of the following materials the net magnetic moment should be zero
Diamagnetic material
Ferromagnetic materials
Antiferromagnetic materials
Ferrimagnetic materials
Which two values are plotted on B-H Curve graph?
Permeability and reluctance
Reluctance and flux density
Magnetizing force and permeability
Flux density and magnetizing force
Permanent magnetic dipoles are absent in material
paramagnetic
ferromagnetic
ferrimagnetic
diamagnetic
