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Engineering Materials in EE

Engineering Materials in EE
How many classes of insulating materials are there?

 6.
 8.
 5.
 7.

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Engineering Materials in EE
In ferromagnetic materials

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

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

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

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Engineering Materials in EE
The number of rings in the Bohr model of any element is determined by what?

 Row number on periodic table.
 Atomic mass.
 Column number on periodic table.
 Atomic number.

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Engineering Materials in EE
What is the dielectric constant of mica ?

  3 to 8.
 200.
 100.
 1 to 2.

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Engineering Materials in EE
In Bohr’s model of atomic structure, the nucleus consists of

 electrons.
 protons and neutrons.
 electrons and protons.
 protons.

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