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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 2
31.
The relationship of hysteresis loss to maximum flux density was first determined by
C. Steinmetz
G.R. Kirchoff
Mr. Laplace
Mr. Ampere
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
In metals the thermal conductivity K and electrical conductivity σ are related as (K/σT) = L, L is known as
Lattice constant
Lorentz number
Lanevin function
Larmor number
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.

Assertion (A): If WF is Fermi energy, v is velocity of electron and m is mass of electron, then .

Reason (R): Conductivity of a metal depends on temperature and impurity concentration.

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:
No answer description is available. Let's discuss.
34.
Dielectric constant of transformer oil is about
1
4
10
20
Answer: Option
Explanation:
No answer description is available. Let's discuss.
35.

Assertion (A): When an electron is revolving in its orbit and magnetic field is also present, the angular frequency of electron will be affected by the magnetic field.

Reason (R): In the case of electron revolving in its orbit in the presence of magnetic field, the orbital magnetic dipole moment is not affected by the presence of magnetic field.

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:

Orbital magnetic moment is equal to (-e/2m).

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