STUPIDSID
Answer any four of the following :-
1 (a)
Explain why FM is immune to noise
5 M
1 (b)
Explain how PPM is generated from PWM
5 M
1 (c)
Explain Tracking in AM receiver
5 M
1 (d)
Why AGC (Control) is needed in receivers. Explain its working in brief
5 M
1 (e)
What is aliasing error and how can it be eliminated?
5 M
2 (a)
With neat block diagram and waveforms explain working of adaptive delta modulation. Explain its advantages
10 M
2 (b)
Explain with a neat block diagram and phasor diagram, working of phase discriminator
10 M
3 (a)
Explain high power AM-DSBFC modulator with schematic diagram
10 M
3 (b)
Derive expression for mathametical representation of FM and its modulation index
10 M
4 (a)
Draw block diagram and pulse code modulation technique and explain every block.
10 M
4 (b)
Derive expression for total trasmitted power, totalside band power and signal side band power for AM wave and draw frequency spectrum for DSBFC
10 M
5 (a)
Draw block diagram of superhet receiver. Write frequency component present at the output of each block if modulation frequency is 1 KHz, carrier frequency 535 KHz & IF 455 KHz also sketch waveforms of output & IF and derector stage
10 M
5 (b)
State and prove sampling theorem for low pass band limited signal
10 M
6 (a)
Draw following data wave forms for bit stream 110101101
(i) Bipolar RZ
(ii) Bipolar RZ AMI
(iii) Unipolar NRZ
(iv) Bipolar NRZ
(i) Bipolar RZ
(ii) Bipolar RZ AMI
(iii) Unipolar NRZ
(iv) Bipolar NRZ
8 M
6 (b)
Draw and explain Delta modulation transmitter and receiver. What is slop overload distortion?
12 M
Write short notes on any four :-
7 (a)
Preemphasis and deemphasis
5 M
7 (b)
Ratio Detector
5 M
7 (c)
μ Law and A law of Companding
5 M
7 (d)
FM noise triangle
5 M
7 (e)
Compare AM with FM
5 M
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