ENGINEERING MATERIALS IN EE QUIZ

The core of a transformer for microwave frequency should be made of

ferrites.

iron.

silicon carbide.

silicon.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which statement is not true of ferromagnetic materials.

They have fixed value of μr.

They have large magnetic susceptibility.

They lose their nonlinearly property above the Curie temperature.

Energy loss is proportional to the area of hysteresis loop.

TRUE ANSWER : ?
YOUR ANSWER : ?

A degaussing is the process of

removing gases from materials.

demagnetising metallic parts.

removal of magnetic impurities.

remagnetising metallic parts.

TRUE ANSWER : ?
YOUR ANSWER : ?

The electron configuration of sulfur atom is

2, 8, 2.

2, 8, 6.

none of these.

1s2 , 2s2 2p6, 3s2 3p6.

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the dielectric constant of mica ?

200.

3 to 8.

100.

1 to 2.

TRUE ANSWER : ?
YOUR ANSWER : ?

The permanent magnets are made from which of following materials ?

Soft iron.

Paramagnetic.

Diamagnetic.

Ferromagnetic.

TRUE ANSWER : ?
YOUR ANSWER : ?

________ is the most detrimental impurity in the magnetic materials

Nitrogen.

Sulphur.

Carbon.

Oxygen.

TRUE ANSWER : ?
YOUR ANSWER : ?

Almost the entire mass of an atom is concentrated in the

protons.

nucleus.

neutrons.

electrons.

TRUE ANSWER : ?
YOUR ANSWER : ?

A ferromagnetic core subjected to cycles of magnetisation will exhibit hysteresis when the cycle is

pulsating.

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

rotating.

alternating.

TRUE ANSWER : ?
YOUR ANSWER : ?

In ferromagnetic materials

one of the constituent is iron.

the constituent is only iron.

the atomic magnetic moments are parallel.

the atomic magnetic moments are antiparallel and unequal.

TRUE ANSWER : ?
YOUR ANSWER : ?