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Engineering Materials in EE

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

 Lead zirconate titanate
 Copper
 Potassium niobate
None of these

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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
Permittivity of free space is equal to

 8.854 × 10 - 11 F / m.
 8.854 × 10 - 12 F / m.
 8.854 × 10 - 13 F / m.
 8.854 × 10 - 10 F / m.

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Engineering Materials in EE
Choose the best suitable of Diamagnetic : Paramagnetic::

 Water : Air.
 Permalloy : Super-alloy.
 Nickel : Cobalt.
 Iron : Steel.

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

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

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Engineering Materials in EE
Dielectric constant for vacuum is

  0.
 100.
  1.
  infinity.

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