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Engineering Materials in EE

Engineering Materials in EE
Cryogenics is a branch of science dealing with which of the following?

 High temperature.
  Low temperature.
 Friction and wear.
 Crystal growth.

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

  3 to 8.
 1 to 2.
 200.
 100.

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

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

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Engineering Materials in EE
How many valence electrons would be found in an atom with the atomic number of 51?

 none of above.
 5.
 51.
 8.

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Engineering Materials in EE
A material with unequal anti-parallel atomic magnetic moments is

 an anti-ferromagnet.
 ferrimagnet.
 a ferrite.
 non-magnetic.

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Engineering Materials in EE
The dielectric strength of ferroelectric materials depends to a large extent on

 area of hysteresis loop for the material.
 frequency of applied voltage.
 intensity of electric field.
 presence of magnetic materials in the vicinity.

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