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Communication Engineering important questionsMost repeated in SPPU papers

These 13 questions appeared in more than one SPPU Communication Engineering paper we have: 5 papers, from Mar 2024 to Mar 2026. The most-asked come first. Each one links to the papers it was asked in.

All Communication Engineering papers and notes

Repeated questions

Endsem questions (4)

  1. 2×asked

    Compare phase modulation with frequency modulation.

    Nov 2025 ·May 2025

  2. 2×asked

    Explain Time Division Multiplexing (TDM) scheme with the help of neat diagram.

    Nov 2025 ·May 2025

  3. 2×asked

    With the help of neat block diagram explain the working of Adaptive Delta modulator.

    Nov 2025 ·May 2025

  4. 2×asked

    With the help of neat block diagram explain the working of Pulse Code Modulation transmitter.

    Nov 2025 ·May 2025

Insem questions (9)

  1. 2×asked

    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.

    Mar 2026 ·Mar 2025

  2. 2×asked

    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

    Mar 2026 ·Mar 2025

  3. 2×asked

    Classify the different types of signal used in communication system.

    Mar 2026 ·Mar 2025

  4. 2×asked

    Differentiate between baseband signal and band pass signal.

    Mar 2026 ·Mar 2025

  5. 2×asked

    Draw the spectrum of DSBFC, DSBSC and SSB.

    Mar 2026 ·Mar 2025

  6. 2×asked

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

    Mar 2026 ·Mar 2025

  7. 2×asked

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

    Mar 2026 ·Mar 2025

  8. 2×asked

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

    Mar 2026 ·Mar 2025

  9. 2×asked

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

    Mar 2025 ·Mar 2024

Questions count as repeated when their wording matches closely across papers. Numericals that depend on a figure are left out, since the figure changes from paper to paper.