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Engineering Materials in EE

Engineering Materials in EE
Substance having permeability less than the permeability of free space, are known as

 paramagnetic.
 diamagnetic.
 ferromagnetic.
 bipolar.

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Engineering Materials in EE
According to the Bohr model, an electron gains or losses energy only by

 jumping from one allowed orbit to another.
 moving faster or slower in an allowed orbit.
 jumping from one atom to another atom.
 being completely removed from an atom.

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

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Engineering Materials in EE
The magnetisation and applied field in ferromagnetic materials are related

 sinusoidally.
 linearly.
 non linearly.
 parabolically.

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Engineering Materials in EE
The materials which exhibit the same elastic properties in all directions are called

 visco elastic.
 isotropic.
 isentropic.
 inelastic.

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

 8.
 7.
 6.
 5.

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