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Engineering Materials in EE

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

 Soft iron.
 Ferromagnetic.
 Diamagnetic.
 Paramagnetic.

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

 diamagnetic.
 bipolar.
 paramagnetic.
 ferromagnetic.

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

 Oxygen.
 Carbon.
 Nitrogen.
 Sulphur.

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Engineering Materials in EE
Maximum number of electrons in a sub-shell with l = 3 and n = 4 is

 10.
 8.
 20.
 14.

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

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

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

 Porcelain.
 All of these.
 Glass.
 Mica.

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