STUPIDSID
Solve any four:
1 (a)
What is modulation? Explain the need of modulation.
5 M
1 (b)
Explain Pre-emphasis and De-emphasis in FM.
5 M
1 (c)
Define sensitivity, selectivity, fidelity and image frequency in radio receiver.
5 M
1 (d)
What are the causes of fold over distortion or aliasing? How can it be prevented or removed.
5 M
1 (e)
Explain companding in detail.
5 M
2 (a)
Derive Friss formula for calculation of total noise figure, if two amplifiers are connected in cascade.
10 M
2 (b)
Draw the block diagram of phase cancellation SSB generator and explain how carrier and unwanted sidebands are suppressed?
10 M
3 (a)
With the help of a neat block diagram explain the principle and generation of indirect method of FM generation.
10 M
3 (b)
Draw and explain Adaptive delta modulation transmitter and receiver with its advantages.
10 M
4 (a)
An AM transmitter radiates 5 MHZ carrier with 80KW power, carrier is modulated by 600HZ and 2KHZ signals.
i) What will be the total modulation index if each signal modulates at 60% of modulation?
ii) Determine the transmitted power.
iii) Draw the frequency spectrum of modulated signal.
iv) What is % of power saving if one of the sidebands and carrier is suppressed?
i) What will be the total modulation index if each signal modulates at 60% of modulation?
ii) Determine the transmitted power.
iii) Draw the frequency spectrum of modulated signal.
iv) What is % of power saving if one of the sidebands and carrier is suppressed?
10 M
4 (b)
What is signal multiplexing? Explain FDM in detail.
10 M
5 (a)
Explain the operation of Foster Seeley discriminator with the help of circuit diagram and phasor diagram.
10 M
5 (b)
Explain with block diagram and waveform of AM Super - heterodyne radio receiver.
10 M
Write a short notes on (solve any four):
6 (a)
Aliasing error and aperture effect.
5 M
6 (b)
Applications of pulse communication.
5 M
6 (c)
Practical diode detector.
5 M
6 (d)
ISB receiver.
5 M
6 (e)
Wide band FM and Narrow band FM.
5 M
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