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Engineering Materials in EE

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

 6.
 5.
 8.
 7.

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Engineering Materials in EE
Which of the following is the ferroelectric material ?

 Potassium dihydrogen phosphate.
All of these
 Barium titanate.
 Rochelle salt.

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

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

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

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

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Engineering Materials in EE
Permittivity of free space is equal to

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

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

 14.
 10.
 8.
 20.

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