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Engineering Materials in EE

Engineering Materials in EE
The electron configuration of sulfur atom is

 2, 8, 2.
 none of these.
 2, 8, 6.
 1s2 , 2s2 2p6, 3s2 3p6.

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Engineering Materials in EE
What are insulating materials that can tolerate maximum temperature?

 Glass.
 Mica.
 Porcelain.
 All of these.

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Engineering Materials in EE
Materials which lack permanent magnetic dipoles are called

None of these
 dia-magnetic.
 semi-magnetic.
 ferro-magnectic.

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Engineering Materials in EE
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

 magnetic expansion.
 magnetic hysteresis.
 magneto-calorisation.
 magnetostriction.

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

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

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

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

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