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Engineering Materials in EE

Engineering Materials in EE
It is difficult to magnetize steel because it has

 high permeability.
 low susceptibility.
  low permeability.
 high permittivity.

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Engineering Materials in EE
Which of the following is the example for piezo-electric material ?

None of these
 Copper
 Lead zirconate titanate
 Potassium niobate

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Engineering Materials in EE
A ferrite core has low eddy current loss than an iron core because

 ferrites have hig hysteresis.
 ferrites are magnetic.
 / >ferrites have high resistance.
 ferrites have low permeability.

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Engineering Materials in EE
In ferromagnetic materials

 the atomic magnetic moments are antiparallel and unequal.
 one of the constituent is iron.
 the constituent is only iron.
 the atomic magnetic moments are parallel.

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Engineering Materials in EE
________ is the most detrimental impurity in the magnetic materials

 Sulphur.
 Oxygen.
 Nitrogen.
 Carbon.

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Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

 semi-magnetic.
 dia-magnetic.
 ferro-magnectic.
None of these

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