Sample Question Paper of Analog Communication And Modulation

Mar 24 • Engineering Sample Papers • 6279 Views • 4 Comments on Sample Question Paper of Analog Communication And Modulation

This blog hepls to provide in depth knowledge of various modulation techniques in analog communication systems with the help of various questions provided in the given sample paper.

Sample paper of B.Tech. 4TH semester.

TIME: 3 HOURS                                                                                                            MARKS:100              

Instructions:

1. All questions are compulsory.

2. Illustrate your answer with neat sketches wherever necessary.

3. Assume suitable data if necessary.

PART-A(5X4=20)

Q.1. What are the advantages and disadvantages of frequency modulation over amplitude modulation?

Q.2. What is cyclic code?

Q.3. Define bit rate and baud.

Q.4. What is the need for modulation?

Q.5. What do you understand by companding?

PART-B(5X16=80)

Q.6. (a.) (i) Explain the generation and detection of amplitude modulation signals using circuit

diagrams.                                                                                                                                  (12)

(ii) How is the transmitted power distributed over carrier and side bands in an AM signal?

Explain.                                                                                                                                       (4)

or

(b.) (i)Describe the stop and wait and the sliding window flow control scheme.                        (12)

(ii)Describe the Go back N and selective reject ARQ error control scheme.                              (4)

Q.7. Write notes on the following:                                                                                             (16)

(i) Different methods of carrier recovery.

(ii) Differential PSK modulator and PSK modulation.

Q.8.   (a.)Explain direct and indirect methods of FM transmission.                                             (16)

or

(b.) Explain Pulse Code Modulation(PCM) and differential Pulse Code Modulation(PCM) with the help of block diagrams.

Q.9.  (a.) (i)Define QPSK modulation and mention advantages of QPSK modulation.                  (10)

(ii)Explain with the help of block diagram, the operation of a QPSK transmitter & receiver.                                                                                                                                        (6)

or

(b.) (i)Explain with the help of block diagram the delta modulation. Compare it with differential

Pulse Code Modulation(PCM).                                                                                      (12)

(ii)Explain the various sources of noise in delta modulation technique.                                  (4)

Q.10.  (a.) (i)Explain with a neat diagram,frequency shift keying and obtain the relation for baud and minimum bandwidth.                                                                                                              (8)

(ii) Describe the operation of FSK transmitter and receiver.                                                         (8)

or

(b.)(i)Explain with the help of neat waveforms, the different pulse modulating schemes.               (8)

(ii)Distinguish between natural and flat top sampling and explain the operation of the sampling block in the Pulse Code Modulation(PCM) system.                                                             (8)

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