STUPIDSID
Give brief answers to any four of the following :-
1 (a)
Explain ground wave propagation of electromagnetic radiations.
5 M
1 (b)
Draw the spectrum of an amplitude modulated wave and explain its components.
5 M
1 (c)
Give advantages and disadvantages of SSB over full carrier DSB amplitude modulated wave.
5 M
1 (d)
Discuss the factors that influence the modulation index of an FM wave.
5 M
1 (e)
How is adaptive delta modulation superior to delta modulation?
5 M
2 (a)
What is a DSBSC wave? Explain its generation using balanced modulator.
10 M
2 (b)
Discuss the factors that influence the choice of IF in superheterodyne receivers.
5 M
2 (c)
The maximum deviation allowed in a FM broadcast system is 75 kHz. If the modulation signal is a single tone sinusoidal of frequency 15kHz, find the bandwidth of the FM signal. How does the bandwidth change if the modulating frequency is doubled?
5 M
3 (a)
How can you use a varactor diode in the generator of FM wave? Explain in detail.
10 M
3 (b)
List out the advantages and disadvantages of FM over AM.
5 M
3 (c)
Calculate the thermal noise power available from any resistor at a temperature of 290 K for a bandwidth of 1 Mhz. Calculate also the corresponding noise voltage if the resistance, R=100 Ω
5 M
4 (a)
Draw the PAM, PWM and PPM waveforms in time domain assuming a sinusoidal modulating signal. Explain them in brief.
10 M
4 (b)
What do you understand by signal multiplexing? Explain in TDM and FDM with suitable examples.
10 M
5 (a)
Explain the working of superheterodyne receiver with the help of a neat block diagram. Show the waveforms at the output of each block.
10 M
5 (b)
Compare analog and digital transmission systems.
5 M
5 (c)
What is VSB? Mention its application.
5 M
6 (a)
Pre-emphasis and De-emphasis
5 M
6 (b)
Automatic gain control
5 M
6 (c)
Ratio detector
5 M
6 (d)
Electromagnetic spectrum
5 M
6 (e)
Noise figure.
5 M
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