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Engineering Materials in EE

Engineering Materials in EE
Find the odd one out.

 Emissivity.
 Refractive index.
 Absorptivity.
 Dielectric strength.

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Engineering Materials in EE
The permanent magnets are made from which of following materials ?

 Diamagnetic.
 Ferromagnetic.
 Soft iron.
 Paramagnetic.

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

 Sulphur.
 Nitrogen.
 Carbon.
 Oxygen.

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

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

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

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

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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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