STUPIDSID
Answer the following (any four):
1 (a)
Classify and explain the various types of noises affecting communication.
5 M
1 (b)
Differentiate between narrowband and wideband FM.
5 M
1 (c)
In AM why IF is selected 455 Khz?
5 M
1 (d)
What is aliasing? How it can be prevented?
5 M
1 (e)
Why AGC is required in radio receivers? Explain diode detector circuit with simple AGC.
5 M
2 (a)
The antenna current of AM broadcast transmitter modulated to depth of modulation index 40% by an audio wae is 11A. Increase to 12A as a result of simultaneous modulation by another audio sine wave. What is modulation index due to this second wave?
5 M
2 (b)
Compare FM and PM.
5 M
2 (c)
Explain with neat block diagram the phase shift method for suppression of unwanted sideband.
10 M
3 (a)
State and Prove sampling theorem for low pass band limited signals.
10 M
3 (b)
Explain the principle and generation of indirect method of FM generation.
10 M
4 (a)
What are the drawbacks of delta modulation? Explain with neat block diagram working of Adaptive delta modulator.
5 M
4 (b)
Explain how PPM is generated from PWM?
5 M
4 (c)
Explain VSB transmission.
10 M
5 (a)
Explain the operation of Foster seely discriminator with the help of circuit diagram and phasor diagram.
10 M
5 (b)
Draw a neat block diagram of super heterodyne radio receiver and explain function of each block with waveforms.
10 M
Write short notes on (any four):
6 (a)
Independent sideband system.
5 M
6 (b)
FM noise triangle.
5 M
6 (c)
μ-law and A-law companding
5 M
6 (c)
TDM and FDM.
5 M
6 (d)
Double spotting.
5 M
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