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RVUNL EE Communication Systems Quiz 1

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Question 1

The figure shown below is

Question 2

A carrier signal when frequency modulated by a certain sinusoidal signal of 1 KHz produces a modulated signal with a bandwidth of 20 KHz. If the same carried signal is frequency modulated by another modulating signal whose peak amplitude is three times that of previous signal and frequency is one half of the previous signal, then the bandwidth of the new modulated signal is

Question 3

The intermediate frequency of a super-heterodyne receiver is 450 KHz. If it is tuned to 1200 KHz, the image frequency will be

Question 4

In a telecommunication trans-receive system the transmitting antenna with antenna aperture of lm is fed with 1W of power at 10GHz. The receive antenna with antenna aperture of 0.5m located at 1km away receives x mW of power. If the transmitting frequency changes to 20GHz, what will happen to receive power?

Question 5

The modulating signal m(t) = [2cos(4000π)t+5cos(6000π)t] is multiplied by the carrier c(t) =100 cos (100000)t.

The spectral components present in the spectrum of the modulated signal have amplitudes of -------&--------?

Question 6

A message signal given by m(t)= (1/2)cos(W₁t) - (1/2)sin(W₂t) is amplitude modulated with a carrier of frequency

to generate

What is the power efficiency achieved by this modulation scheme?

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AE & JE Exams

May 7AE & JE Exams