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Engineering Materials in EE

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

 Mica.
 Glass.
 All of these.
 Porcelain.

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Engineering Materials in EE
When a ferromagnetic substance is magnetized small changes in dimensions occur. Such a phenomenon is known as

 magnetostriction.
 magneto-calorisation.
 magnetic expansion.
 magnetic hysteresis.

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Engineering Materials in EE
Which of the following statements is not part of Daltons atomic theory?

 All matter is composed of atoms.
 An atom contains a dense central nucleus.
 Atoms can combine to form compounds.
 Atoms of different elements are quite different.

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

 nucleus.
 protons.
 neutrons.
 electrons.

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

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

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Engineering Materials in EE
The temperature beyond which substances lose their ferroelectric properties, is known as

 critical temperature.
 conversion temperature.
 inversion temperature.
 curie temperature.

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