ENGINEERING MATERIALS IN EE QUIZ

Materials having a high dielectric constant, which is non-linear, are known as

hard die-electrics.

elastomers.

super die-electrics.

ferroelectric materials.

TRUE ANSWER : ?
YOUR ANSWER : ?

________ is the most detrimental impurity in the magnetic materials

Oxygen.

Carbon.

Nitrogen.

Sulphur.

TRUE ANSWER : ?
YOUR ANSWER : ?

Susceptibility is negative for

none of above.

diamagnetic substances.

ferromagnetic substances.

non magnetic substances.

TRUE ANSWER : ?
YOUR ANSWER : ?

Why diamond is very hard ?

Because of covalent solid

Because of high melting point

Because of large cohesive energy

None of these

TRUE ANSWER : ?
YOUR ANSWER : ?

What is the dielectric constant of mica ?

200.

3 to 8.

1 to 2.

100.

TRUE ANSWER : ?
YOUR ANSWER : ?

The atomic radius in case of face centered cubic lattice is

a.

a / 3.

a / 2.

a / 4.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

10.

14.

8.

20.

TRUE ANSWER : ?
YOUR ANSWER : ?

The temperature beyond which substances lose their ferroelectric properties, is known as

conversion temperature.

inversion temperature.

curie temperature.

critical temperature.

TRUE ANSWER : ?
YOUR ANSWER : ?

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

All of these

Large hysteresis loop.

High electrical resistivity.

High magnetic permeability.

TRUE ANSWER : ?
YOUR ANSWER : ?

A degaussing is the process of

remagnetising metallic parts.

removing gases from materials.

removal of magnetic impurities.

demagnetising metallic parts.

TRUE ANSWER : ?
YOUR ANSWER : ?

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