CS6304 Analog & Digital Communication Question Bank : dmice.ac.in
Name of the College : DMI College OF Engineering
Subject : Analog and Digital Communication
Website : dmice.ac.in
Document type : Question Bank
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DMI Analog & Digital Communication Question Bank
ANALOG COMMUNICATION :
UNIT – I
Part – A :
** Define Noise. What are the sources of noise
** What is shot noise
** What is Thermal noise
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** Define Avalanche noise
** Define Amplitude modulation.
** Differentiate between Narrow band and Wide band FM signal.
** What is modulation index and percent modulation?
** Draw the FM and PM waveforms
** Draw the amplitude modulation wave forms with modulation Index m =1, m<1, m>1.
** Compare AM with DSB-SC and SSB-SC.
** Define Angle modulation.
** Name Different types of FM detectors.
** Define modulation index for FM and PM.
** Compare FM with AM.
** State Carson’ general rule for determining the bandwidth for an angle modulated wave.
** What is the need for modulation
** Draw the envelope of AM
** Define frequency deviation on FM?
** Define image frequency.
** Describe the relationship between the carrier and sideband powers in an AM-DSBFC wave.
Part – B :
Define Noise figure and explain how it can be calculated.
Explain the types of noise in detail
(i)Derive equations for AM voltage and power distribution.
(ii)Explain frequency analysis of angle modulation waves.
(i)Explain a note on frequency deviation of FM wave.
(ii) Describe the generation of FM.
Define FM. Derive the equation for FM wave.
Define AM. Derive the expression for AM wave.
(i) Distinguish between FM and PM by giving its mathematical analysis. (8)
(ii) Derive the relationship between the voltage amplitudes of the side band frequencies and the carrier and draw the frequency spectrum. (8)
(i) Compare the advantages and disadvantages of angle modulation with amplitude modulation.
(ii)In angle modulation, explain frequency deviation, percent modulation and phase deviation and modulation index with suitable example.
UNIT – II
DIGITAL COMMUNICATION :
Part – A :
** What do you meant by FSK?
** What is M-ary encoding?
** Define Shannon limit for information capacity.
** How are bit rate and baud rate related?
** Define coherent and coherent digital modulation methods
** Define Nyquist sampling theorem
** What is QAM
** Define Bandwidth efficiency.
** Define Duo binary encoding
** Give the principles of PPL.
** What is correlative coding?
** Compare bandwidth of M-ary PSK signal and M-ary FSK signal.
** What are the types of digital data format
** Define DPSK.
** Define modulation index of FSK.
** Differentiate QPSK and BPSK.
** Differentiate ASK and FSK
** Define minimum Shift keying.
** What are the advantages of QPSK?
** Define information capacity and bit rate.
Part – B :
1. With a neat schematic diagram, explain the balanced ring modulator of BPSK.
2. (i)Describe the two techniques of achieving carrier recovery circuit.
(ii)Explain in detail about 8QAM transmitter and receiver.
3. (i)Write a note on bandwidth consideration in FSK.
(ii)Explain the principle of operation of QPSK.
4. (i) Explain about binary phase shift keying.
(ii)Describe the principle of operation of FSK transmitter.
5. What is frequency shift keying? Explain in detail about FSK transmitter and receiver.
6. With neat schematic diagram, explain the balanced ring modulator of BPSK.
7. Briefly explain the BPSK transmitter and BPSK receiver.
8. Explain the operation of QPSK transmitter and receiver.
9. (i) Compare the various types of digital modulation techniques.
(ii)Explain the eye pattern in base band digital transmission with a neat diagram.
10. Explain in detail carrier recovery with a suitable block diagram.