Skip to content
InsemMar 20262019 patternSE E&TC

Principles of Communication Systems SPPU Insem Question Paper Mar 2026

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 2026
Max. marks
30
Time
1 Hour
Semester
IV
Paper code
APR-26/SE/Insem-253

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

Instructions to the candidates

  1. Answer Q.1 or Q.2 and Q.3 or Q.4.
  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 2025

      [5]
    2. b)

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

      Also asked:Mar 2025

      [5]
    3. c)

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

      Also asked:Mar 2025

      [5]

  2. Q2

    1. a)

      Explain the regenerative repeaters and the use of regenerative repeaters.

      [5]
    2. b)

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

      Also asked:Mar 2025

      [5]
    3. c)

      Classify the different types of signal used in communication system.

      Also asked:Mar 2025

      [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 2025

      [5]
    2. b)

      Draw the block diagram of low level AM transmitter.

      [5]
    3. c)

      Explain the generation of DSB-SC using nonlinear device.

      [5]

  4. Q4

    1. a)

      A modulating signal 20 sin (2 π ×10 3 t) is used to modulate a carrier signal 40 sin (2 π ×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 2025

      [5]
    2. b)

      Draw the spectrum of DSBFC, DSBSC and SSB.

      Also asked:Mar 2025

      [5]
    3. c)

      This part has equations that don’t show as text. Open the PDF to read it.

      [5]