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Electronics and Communication Engineering - Materials and Components

Exercise : Materials and Components - Section 5
31.
A dielectric of relative permittivity ∈r is subjected to a homogeneous electric field E. The dipole moment P per unit volume is given by
P = constant
P = ∈0 E
P = ∈0(∈r - 1) E
P = ∈r E
Answer: Option
Explanation:
No answer description is available. Let's discuss.
32.
Which of these has the highest dielectric strength?
Mica
Air
Cotton
Rubber
Answer: Option
Explanation:
No answer description is available. Let's discuss.
33.
An electron in a metal suffers collision and if the probability of it being scattered over an angle dθ is 2p P(θ) sin θ dθ where P(θ) is an arbitrary function of scattering angle θ, then
2pP(θ) sin θ dθ = 0
2pP(θ) sin θ dθ = 2
2pP(θ) sin θ dθ = -1
2pP(θ) sin θ dθ = 1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
34.
For an insulating material, dielectric strength and dielectric losses should be
high and high
low and high
high and low
low and low
Answer: Option
Explanation:

An insulating material should have high dielectric strength and low losses.

35.
Consider the following statements
  1. An iron cored choke is non linear and passive device.
  2. A carbon resistor kept in sunlight is a time invariant and passive device.
  3. A dry cell is a time varying and active device.
  4. An air capacitor is time invariant and passive device.
Of these statements
1, 2, 3 and 4 are correct
1, 2, 3 are correct
1, 2, 4 are correct
2 and 4 are correct
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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