Electronics and Communication Engineering - Exam Questions Papers - Discussion

17. 

A 1000 kHz carrier wave modulated 40% at 4000 Hz is applied to a resonant circuit tuned to a carrier frequency and having Q = 140. What is the degree of modulation after passing the wave through this circuit?

[A]. 0.4
[B]. 0.2
[C]. 0.27
[D]. 0.554

Answer: Option C

Explanation:

Resulting depth of modulation is given by :

when δ =

fc = 1000 x 103 Hz

fm = 4 x 103 Hz

δ =

m0 =

= = 0.27 .


Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.