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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 2
16.
In a homogeneous magnetic field H of a solenoid, the core carries a magnetic dipole moment M per unit volume equal to
μ0 H
μr H
(μr - 1) H
μoμr H
Answer: Option
Explanation:
No answer description is available. Let's discuss.
17.
The field pattern of a solenoid is similar to that of bar magnet.
True
False
Answer: Option
Explanation:
No answer description is available. Let's discuss.
18.

Assertion (A): In a parallel plate capacitor having area of plate 1 m2 and plate separation 1 m, the capacitance C and resistance R are given by C = ∈0∈'r and R = where ω is frequency, ∈r' and ∈r" are real and imaginary parts of dielectric constant.

Reason (R): The imaginary part of electric constant is responsible for dielectric losses.

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.
19.

Assertion (A): Silicon is the most favoured semiconductor material.

Reason (R): PIV for silicon diode is more than that for germanium diode.

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:

Higher PIV for silicon is a definite advantage.

20.

Assertion (A): When cathode temperature is increased from 2500 K to 2550 K, thermionic emission current may increase by about 50%.

Reason (R): Thermionic emission current ∝ T2 e-Ew/kT.

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.
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