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Electronics and Communication Engineering - Electromagnetic Field Theory

Exercise : Electromagnetic Field Theory - Section 5
6.
The temperature of cathode is increased from 2500K to 2600K. The increase in thermionic emission current is about
0.1%
4%
50%
150%
Answer: Option
Explanation:
No answer description is available. Let's discuss.
7.
Consider the following statement: At finite temperature, magnetic dipoles in a material are randomly oriented giving low magnetization. When magnetic field H is applied, the magnetization?
  1. Increases with H
  2. Decreases with H
  3. Decreases with temp for constant H
Which of the statement given above is/are correct?
1
2
2, 3
1 and 3
Answer: Option
Explanation:
No answer description is available. Let's discuss.
8.
Ferrites have
low copper loss
low eddy current loss
low resistivity
higher specific gravity compared to iron
Answer: Option
Explanation:
No answer description is available. Let's discuss.
9.
Eg is the band gap, A is pre-factor, k is Boltzmann constant? Which one of the following is the remaining grade of paper used in paper capacitor, besides the other two grade of paper-low and extra low loss?
Strong dielectric
Regular
Rough
High loss
Answer: Option
Explanation:
No answer description is available. Let's discuss.
10.
Barkhausen criterion of oscillation is
Aβ > 1
Aβ = 1
Aβ = < 1
Aβ ≤ 1
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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