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Engineering Materials in EE

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

 Sulphur.
 Oxygen.
 Carbon.
 Nitrogen.

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Engineering Materials in EE
In ferromagnetic materials

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

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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 statements is not part of Daltons atomic theory?

 All matter is composed of atoms.
 Atoms of different elements are quite different.
 An atom contains a dense central nucleus.
 Atoms can combine to form compounds.

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

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

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Engineering Materials in EE
Absolute permittivity of a dielectric medium is represented by

None of these
 εr / εo.
 εo / εr.
 εoεr.

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