ENGINEERING MATERIALS IN EE QUIZ

 Cobalt, nickel, aluminium, iron.

 Pure iron, silicon iron, aluminium, bismuth.

 Silver, copper, aluminium, iron.

  Permalloy, nickel, air, water.

 removing gases from materials.

 demagnetising metallic parts.

 remagnetising metallic parts.

 removal of magnetic impurities.

 0.

 1.

 Less than 1

 none of these.

  large B-H loop area.

  low hysteresis coefficient.

  high resistivity.

  high retentivity.

 moving faster or slower in an allowed orbit.

 jumping from one atom to another atom.

 being completely removed from an atom.

 jumping from one allowed orbit to another.

 Lead zirconate titanate

 Potassium niobate

 Copper

None of these

 Large hysteresis loop.

 High electrical resistivity.

 High magnetic permeability.

All of these

 decreases with increasing temperature.

 is independent of temperature.

 increases with increasing temperature.

 depends on method of heating.

 paramagnetic.

 bipolar.

 ferromagnetic.

 diamagnetic.

 7.

 4.

 12.

 2.