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Engineering Materials in EE

Engineering Materials in EE
Dielectric constant for vacuum is

  infinity.
 100.
  1.
  0.

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Engineering Materials in EE
Positive magnetostriction exists when

 both are correct.
 none of above.
 dipoles are attract each other.
 dipoles are repel other.

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Engineering Materials in EE
Permanent magnets are used in

 generators.
 all of above.
 loud speakers.
 motors.

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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 constituent is only iron.
 the atomic magnetic moments are parallel.

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Engineering Materials in EE
Materials having a high dielectric constant, which is non-linear, are known as

 ferroelectric materials.
 elastomers.
 hard die-electrics.
 super die-electrics.

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Engineering Materials in EE
The dielectric strength of ferroelectric materials depends to a large extent on

 area of hysteresis loop for the material.
 frequency of applied voltage.
 intensity of electric field.
 presence of magnetic materials in the vicinity.

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