Engineering Materials Objective Questions

In electrical machines the material preferred for pole shoes of electromagnets is

The materials which exhibit the same elastic properties in all directions are called

How many classes of insulating materials are there?

What is the value of dielectric constant of a air ?

The potential gradient across the material of low permittivity is ______________ than across the material of high permittivity.

Which of the following gives materials in order of decreasing values of permeability?

Which of the following is the ferroelectric material ?

Which one of the following units is a fundamental unit?

In ferromagnetic materials

________ is the most detrimental impurity in the magnetic materials

Materials which lack permanent magnetic dipoles are called

A material with unequal anti-parallel atomic magnetic moments is

In order to minimise loss due to hysteresis, the magnetic material should have

Which of the following quantities consists of S.I. unit as Hertz?

The permanent magnets are made from which of following materials ?

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

Which of the following is the example for piezo-electric material ?

Indicate which of following material does not retain magnetism permanently

What is the name of the fluorescent material that gives red colour fluorescence?

Which of following material has least value of dielectric constant?

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

The dielectric strength of ferroelectric materials depends to a large extent on

Which statement is not true of ferromagnetic materials.

The magnetisation and applied field in ferromagnetic materials are related

What are insulating materials that can tolerate maximum temperature?