Communication Systems - Study Mode

[#141] What is the modulation index of an FM signal having a carrier swing of 100 kHz and modulating frequency of 8 kHz?
Correct Answer

(C) 6.25

[#142] An AM signal has a total power of 48 Watts with 45% modulation. The power in the carrier and the sidebands are
Correct Answer

(C) 43.59 W, 2.205 W

[#143] The RF amplifier A is having 3 dB NF & 5 dB of gain, amplifier B is having 3.5 dB NF & 15 dB. For overall noise figure of the cascaded system, the correct statement is:
Correct Answer

(B) B as first stage & A as second stage minimum over all NF

[#144] For a symmetrical distribution the coefficient of skewness is
Correct Answer

(D) zero

[#145] A carrier of 10 kW is amplitude modulated to a depth of 100% by a sinusoid. Then the power of the transmitted AM wave is
Correct Answer

(C) 15 kW