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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 7
16.

Assertion (A): A capacitor with imperfect dielectric can be represented by a capacitance in parallel with resistance.

Reason (R): For imperfect dielectrics, dielectric constant has real and imaginary parts.

Both A and R are true and R is correct explanation of A
Both A and R are true but R is not correct explanation of A
A is true but R is false
A is false but R is true
Answer: Option
Explanation:

Imaginary part of dielectric constant is responsible for dielectric losses.

17.
An atom of a rare gas is placed is an electric field E. Then
the nucleus will be shifted in the direction of E by an amount which is proportional to E.
the nucleus will not be shifted.
the nucleus will be shifted in the direction of E by an amount which is independent of E.
the nucleus will be shifted in a direction opposite to that of E.
Answer: Option
Explanation:

For equilibrium nucleus is shifted in the direction of E by an amount which is proportional to E.

18.
In van der walls crystals, there exists a high degree of stability of the outer electron shell.
True
False
Answer: Option
Explanation:

This is the reason for chemical inactivity in these crystals.

19.
As per temperature limits, the number of categories of solid dielectrics are
7
6
8
5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
20.
At room temperature the number of conducting electrons in an intrinsic semiconductor
is almost equal to the number of valence electrons
is about half the number of valence electrons
is small as compared to the number of valence electrons
is a very small fraction of the number of valence electrons
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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