Communication Systems - Study Mode
[#146] Select correct answer- A 400 W carrier is modulated to a depth of 75%. Calculate the total power in the modulated wave.
Correct Answer
(C) 512.5 W
[#147] The figure shows the block diagram of a frequency discriminator. What does the second block represent?
Correct Answer
(A) Envelope detector
[#148] Percentage modulation of an AM wave having a power content of 8 kW at carrier frequency and 2 kW in each of its side bands is
Correct Answer
(C) 100%
[#149] The outputs of two noise sources each producing uniformly distributed noise over the range -a to +a are added. What is the p.d.f. of the added noise?
Correct Answer
(B) Triangular over the range -2a to 2a
[#150] In a FM demodulator,
Correct Answer
(B) frequency deviations are converted into voltage variations