# Test: Dielectric Strength & Constant

## 10 Questions MCQ Test Electromagnetic Fields Theory | Test: Dielectric Strength & Constant

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Attempt Test: Dielectric Strength & Constant | 10 questions in 10 minutes | Mock test for Electronics and Communication Engineering (ECE) preparation | Free important questions MCQ to study Electromagnetic Fields Theory for Electronics and Communication Engineering (ECE) Exam | Download free PDF with solutions
QUESTION: 1

### Which of the following is not an example of elemental solid dielectric?

Solution:

Explanation: Elemental solid dielectrics are the materials consisting of single type of atoms. Such materials have neither ions nor permanent dipoles and possess only electronic polarisation. Its examples are diamond, sulphur and germanium.

QUESTION: 2

### Ionic non polar solid dielectrics contain more than one type of atoms but no permanent dipoles. State True/False

Solution:

Explanation: In ionic crystals, the total polarisation is electronic and ionic in nature. Thus, it implies that it contains more than one type of atom and no permanent dipoles.

QUESTION: 3

### Compute the refractive index when the dielectric constant is 256 in air.

Solution:

Explanation: By Maxwell relation, εr = n2, where εro is the dielectric constant at optical frequencies and n is the refractive index.For the given dielectric constant we get n = 16.

QUESTION: 4

Dielectric property impacts the behaviour of a material in the presence of electric field. State True/False.

Solution:

Explanation: Based on the dielectric property, a material can be classified as piezoelectric, ferroelectric, pyroelectric and anti-ferroelectric materials under the influence of electric field.

QUESTION: 5

Curie-Weiss law is applicable to which of the following materials?

Solution:

Explanation: Curie-Weiss law is given by χe = εr -1 = C/(T-θ), where C is the curie constant and θ is the characteristic temperature which is usually a few degrees higher than the curie temperature for ferromagnetic materials.

QUESTION: 6

Curie-Weiss law is used to calculate which one of the following?

Solution:

Explanation: Curie-Weiss law is given by χe = εr -1. Thus it is used to calculate the electric susceptibility of a material.

QUESTION: 7

Calculate the loss tangent when the dielectric constant in AC field is given by 3 + 2j.

Solution:

Explanation: The AC dielectric constant is given by εr = ε` – jε“, where ε` is the real part of AC dielectric and ε“ is the imaginary part of AC dielectric. The loss tangent is given by tan δ = ε“/ε` = -2/3.

QUESTION: 8

When a dielectric loses its dielectric property, the phenomenon is called

Solution:

Explanation: Due to various treatments performed on the dielectric, in order to make it conduct, the dielectric reaches a state, where it loses its dielectric property and starts to conduct. This phenomenon is called as dielectric breakdown.

QUESTION: 9

Choose the best definition of dielectric loss.

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