Dr. A.P.J. Abdul Kalam University BE IV SEM (CS) Analog & Digital Communication [CS226T] June 2021 Question Paper

Dr. A.P.J. Abdul Kalam University

Bachelor of Engineering

Fourth Semester Main Examination, June-2021

Analog & Digital Communication [CS226T]

Branch-CS

Time: 3:00 Hrs Max Marks 70

Note : Attempt any five questions. All questions carry equal marks.

Q.1 (a) Write the various techniques for amplitude modulation and

demodulation of analog signals.

 (b) Write short note on SSB and VSB.

Q.2 (a) Write short note on Impulse periodic impulse sine and cosine wave.

(b) Explain Fourier Transform and its properties.

Q.3 (a) Explain modulation techniques and its applications.

(b) Describe Time domain and frequency domain representation of

signals.

Q.4 (a) Write Modulation equation and their relative phase.

 (b) Explain Balance/Chopper modulator

Q.5 (a) Write short note on NBFM and WBFM

 (b) Explain synchronous detection technique and errors in its.

Q.6 (a) Explain Bandwidth comparison of modulation techniques.

(b) Differentiate between Signal Sampling and Analog Pulse

Communication.

Q.7 (a) What do you mean by modulation index frequency spectrum ?

 (b) What do you mean by PPM and PDM? Explain?

Q.8 (a) Explain sampling theorem for low pass and Band pass signals?

(b) What do mean by Digital signal Quantization and what errors are

raised during Quantization?

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