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Engineering Materials in EE

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

 Nitrogen.
 Sulphur.
 Carbon.
 Oxygen.

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Engineering Materials in EE
ALNICO is an alloy of

 iron, aluminium.
 aluminium, nickel.
 iron, cobalt, nickel.
 aluminium, nickel, iron and cobalt.

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Engineering Materials in EE
A degaussing is the process of

 remagnetising metallic parts.
 demagnetising metallic parts.
 removal of magnetic impurities.
 removing gases from materials.

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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

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

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

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

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

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