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Modulation and Demodulation-3 Starter Quiz

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Question 1

A narrow band FM signal approximately defined by S(t) ≈ Ac cos(2ϖfct) –BAc sin (2ϖfct) sin(2ϖfmt)

What is the ratio of the maximum to the minimum value of the envelop?

Question 2

Two carrier 40 MHz and 80 MHz respectively are frequency modulated by a signal of frequency 4 kHz, such that the band width of them FM signal in the two cases are the same. The deviation in the two case are in the ratio of

Question 3

A carrier is phase modulated (PM) with frequency deviation of 10 kHz by a single tone frequency of 5 kHz. If the signal tone frequency is increased to two times, assuming that phase deviation remains unchanged the bandwidth of PM signals is:

Question 4

The message signal m(t) shown in the figure below is applied to an FM modulator.

If the maximum frequency deviation of the resultant FM signal is 3 KHz, then the frequency sensitivity of the FM modulator will be ______. KHz/V

Question 5

The message signal m(t), which is shown in the figure below, is applied to a frequency modulator

If the frequency sensitivity of the modulator is 50 Hz/V, then the maximum phase deviation of the resultant FM signal will be

Question 6

Frequency modulated signal is applied to two frequency multipliers connected to cascade. The first multipliers triples the frequency while second multiplier has multiplication factor of four. The resultant frequency deviation is 120 kHz, while modulating signal frequency becomes 5 kHz after passing through multipliers. What would be the frequency separation of the adjacent side frequency of FM signal before entering is multipliers and what is initial modulation index?
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May 12ESE & GATE EC