# Electronics and Communication Engineering - Exam Questions Papers

46.
A magnetic field in air is measured to be

What current distribution leads to this field?
[Hint: The algebra is trivial in cylindrical coordinates.]
0
Explanation:
No answer description is available. Let's discuss.

47.
For a series R-L-C circuit, the characteristic equation is given as

If is denoted by a and by β, then under the condition of β2 > a2, the system will be
critically damped
underdamped
undamped
overdamped
Explanation:
No answer description is available. Let's discuss.

48.
In the epitaxial diffused method of fabricating integrating circuits the process involved are __________
1. Epitaxial growth
2. Diffusion
3. Silicon diode growth
4. Vacuum evaporation of aluminium
5. Photoetching
The correct order is
1 - 2 - 3 - 4 - 5
1 - 3 - 5 - 2 - 4
3 - 1 - 4 - 5 - 2
1 - 3 - 2 - 4 - 5
Explanation:
No answer description is available. Let's discuss.

49.
The switch in the circuit shown was on position a for a long time, and is moved to position b at time t = 0. The current i(t) for t > 0 is given by
0.2e-125tu(t) mA
20e-1250tu(t) mA
0.2e-1250tu(t) mA
20e-1000tu(t) mA