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Engineering Materials in EE

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

 Diamagnetic.
 Ferromagnetic.
 Paramagnetic.
 Soft iron.

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Engineering Materials in EE
All ions of an element have the same

 number of protons.
 number of electrons.
 atomic number.
 both option A. and C.

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Engineering Materials in EE
In electrical machines the material preferred for pole shoes of electromagnets is

 lead.
 pure iron.
 copper.
 aluminium.

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Engineering Materials in EE
A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is

 / >(A), (B), and (C) are all correct.
 pulsating.
 alternating.
 rotating.

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Engineering Materials in EE
Dielectric constant for vacuum is

 100.
  1.
  0.
  infinity.

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Engineering Materials in EE
What is the dielectric constant of mica ?

 100.
 1 to 2.
 200.
  3 to 8.

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