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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 7
36.
On the basis of the type of chemical bonds, solids may be classified into
ionic crystals
ionic and valence crystals
ionic crystal, valence crystals and metals
ionic crystals, valence crystals, metal and vander wall crystals
Answer: Option
Explanation:
No answer description is available. Let's discuss.
37.
The units for intrinsic strength of dielectric are
kV
kV/m
A
A/m
Answer: Option
Explanation:

Dielectric strength is expressed in volts (or kV) per unit distance (cm or mm).

38.
Specific resistance of silver is about
0.16 x 10-8 Ω-m
1.64 x 10-8 Ω-m
16 x 10-8 Ω-m
164 x 10-8 Ω-m
Answer: Option
Explanation:
No answer description is available. Let's discuss.
39.
The v-i relation for an arc is v = 44 + . If v = 50 V, i =
10 A
5 A
2 A
0.5 A
Answer: Option
Explanation:

.

40.

Assertion (A): If an electron having charge e is revolving in an orbit of radius R and with angular velocity ω, the magnetic dipole moment of orbit is 0.5 eωR2.

Reason (R): Orbital angular momentum and magnetic dipole moment are always equal.

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 angular momentum and magnetic dipole moment are not equal.

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