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Engineering Materials in EE

Engineering Materials in EE
Almost the entire mass of an atom is concentrated in the

 electrons.
 protons.
 nucleus.
 neutrons.

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Engineering Materials in EE
Which of the following is the least desired property in magnetic materials for electrical engineering applications ?

 High magnetic permeability.
 High electrical resistivity.
 Large hysteresis loop.
All of these

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Engineering Materials in EE
A degaussing is the process of

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

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

None of these
 Lead zirconate titanate
 Copper
 Potassium niobate

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Engineering Materials in EE
The numberof atoms per unit cell in a B.C.C structure is

 4.
 2.
 7.
 12.

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Engineering Materials in EE
How many classes of insulating materials are there?

 7.
 6.
 8.
 5.

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