ENGINEERING MATERIALS IN EE QUIZ

________ is the most detrimental impurity in the magnetic materials

Nitrogen.

Sulphur.

Oxygen.

Carbon.

TRUE ANSWER : ?
YOUR ANSWER : ?

In ferromagnetic materials

the atomic magnetic moments are parallel.

one of the constituent is iron.

the atomic magnetic moments are antiparallel and unequal.

the constituent is only iron.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of the following is the ferroelectric material ?

All of these

Barium titanate.

Potassium dihydrogen phosphate.

Rochelle salt.

TRUE ANSWER : ?
YOUR ANSWER : ?

The intensity of magnetization, M, of a ferro magnetic solid

depends on method of heating.

is independent of temperature.

decreases with increasing temperature.

increases with increasing temperature.

TRUE ANSWER : ?
YOUR ANSWER : ?

In Bohr’s model of atomic structure, the nucleus consists of

electrons.

protons.

protons and neutrons.

electrons and protons.

TRUE ANSWER : ?
YOUR ANSWER : ?

Which of following material has least value of dielectric constant?

Ceramics.

Glass.

Oil.

Paper.

TRUE ANSWER : ?
YOUR ANSWER : ?

Temporary magnets are used in which of the following ?

Generators.

Motors.

All of these.

Hoist.

TRUE ANSWER : ?
YOUR ANSWER : ?

Absolute permittivity of a dielectric medium is represented by

None of these

εoεr.

εr / εo.

εo / εr.

TRUE ANSWER : ?
YOUR ANSWER : ?

How many classes of insulating materials are there?

6.

5.

8.

7.

TRUE ANSWER : ?
YOUR ANSWER : ?

A ferrite core has low eddy current loss than an iron core because

ferrites have low permeability.

ferrites have hig hysteresis.

/ >ferrites have high resistance.

ferrites are magnetic.

TRUE ANSWER : ?
YOUR ANSWER : ?

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