STUPIDSID
1 (a)
Compare AM and FM.
5 M
1 (b)
In a broadcast superheterodyne receiver having no RF amplifier, the loaded Q of the antenna coupling circuit is 150. If the IF is 455 Khz, calculate the image frequency and its rejection ratio at 1400 kHz.
5 M
1 (c)
Explain noise triangle in FM.
5 M
1 (d)
Explain the following terms:-
i) Signal-to-noise ratio
ii) Noise figure
iii) Noise factor
iv) Equivalent noise temperature
i) Signal-to-noise ratio
ii) Noise figure
iii) Noise factor
iv) Equivalent noise temperature
5 M
1 (e)
Explain ISB transmission
5 M
2 (a)
Explain Armstrong method of FM generation with the help of a neat block diagram and phasor diagrams.
10 M
2 (b)
Draw the block diagram of Delta modulation technique and explain each block.
10 M
3 (a)
State sampling theorem. Explain flat-top sampling. Draw its spectrum and explain aperture effect.
10 M
3 (b)
Explain generation and demodulation of PAM, PPM and PWM with waveforms.
10 M
4 (a)
Explain TDM and FDM
10 M
4 (b)
Explain the following with reference to ratio receivers:
i) Selectivity
ii) Fidelity
iii) Sensitivity
iv) Double spotting
i) Selectivity
ii) Fidelity
iii) Sensitivity
iv) Double spotting
10 M
5 (a)
Draw the schematic diagram of simplified medium-power transistor AM DSBFC modulator and explain the operation with the help of collector waveforms with no modulating signal and collector waveforms with a modulating signal.
10 M
5 (b)
Draw the block diagram of Super heterodyne radio receiver and explain the same.
10 M
Write short notes on.
6 (a)
ISB transmission
5 M
6 (b)
Pre-emphasis and De-emphasis
5 M
6 (c)
Companding
5 M
6 (d)
AGC
5 M
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