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Exam Questions Papers - Engineering

Q1:

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

ANS:C - 0.27

Resulting depth of modulation is given by : when δ = fc = 1000 x 103 Hz fm = 4 x 103 Hz δ = m0 = = = 0.27 .