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InsemMar 20252019 patternSE E&TC

Principles of Communication Systems SPPU Insem Question Paper Mar 2025

This 2019-pattern Principles of Communication Systems paper is listed under Communication Engineering. All 4 questions are below, as printed.

Open the PDFMost repeated Communication Engineering questions
Subject code
204193
Pattern
2019 pattern
Exam
Insem
Session
Mar 2025
Max. marks
30
Time
1 Hour
Semester
IV
Paper code
[6409]-213

Printed for: S.E. (Electronics / E & TC / Electronics & Computer Engg.) /

Instructions to the candidates

  1. Answer Q1 or Q2, Q3 or Q4.
  2. Neat diagrams must be drawn wherever necessary.
  3. Figures to the right indicate full marks.
  4. Assume suitable data if necessary.

Questions

  1. Q1

    1. a)

      Differentiate between baseband signal and band pass signal.

      Also asked:Mar 2026

      [5]
    2. b)

      Obtain the Fourier Transform of rectangular pulse with time duration T and amplitude A.

      Also asked:Mar 2026

      [5]
    3. c)

      What is modulation? Explain the need of modulation in communication systems.

      Also asked:Mar 2026

      [5]

  2. Q2

    1. a)

      Explain the regenerative repeaters and the use of regenerative repeaters.

      [5]
    2. b)

      State and explain the following properties of Fourier transform i) Frequency Shifting ii) Time Shifting

      Also asked:Mar 2026

      [5]
    3. c)

      Classify the different types of signal used in communication system.

      Also asked:Mar 2026

      [5]

  3. Q3

    1. a)

      A 12 kW carrier wave is amplitude modulated at 80% depth of modulation by a sinusoidal modulating signal. Calculate the sideband power, total power and the transmission efficiency of the AM wave.

      Also asked:Mar 2026

      [5]
    2. b)

      Explain the phase shift method for generating SSB-SC using block diagram.

      [5]
    3. c)

      Explain the generation of DSB-SC using balanced modulator.

      [5]

  4. Q4

    1. a)

      A modulating signal 20 sin(2  × 10 3 t) is used to modulate a carrier signal 40 sin(2  × 10 4 t) calculate: i) Modulation Index ii) Efficiency iii) Sideband frequencies and their amplitudes iv) Bandwidth of AM wave v) Draw the frequency spectrum

      Also asked:Mar 2026

      [5]
    2. b)

      Draw the spectrum of DSBFC, DSBSC and SSB.

      Also asked:Mar 2026

      [5]
    3. c)

      Draw & Explain the block diagram of AM super heterodyne receiver. 

      Also asked:Mar 2024

      [5]