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Engineering Materials in EE

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

 All of these.
 Porcelain.
 Glass.
 Mica.

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

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

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

 8.
 5.
 7.
 6.

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Engineering Materials in EE
Permittivity of free space is equal to

 8.854 × 10 - 10 F / m.
 8.854 × 10 - 12 F / m.
 8.854 × 10 - 11 F / m.
 8.854 × 10 - 13 F / m.

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Engineering Materials in EE
Two different isotopes of an element have different

 numbers of neutrons.
 numbers of electrons.
 atomic number.
 numbers of protons.

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

  3 to 8.
 200.
 1 to 2.
 100.

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