FEE Unit 5 Notes AKTU (BEC101)

AKTU · BTECH · Semester 1, 2 · Fundamentals of Electronics Engineering · Unit 5 · Notes

AKTU Fundamentals of Electronics Engineering (BEC101) Unit 5 notes for B.Tech Semester 1/2 – Fundamentals of Communication Engineering. Topics: Signal…

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Unit 5: Fundamentals of Communication Engineering – AKTU syllabus topics

  • Signal Representation and Analysis: Electromagnetic Spectrum, Elements of Communication System
  • Amplitude Modulation: Need and Applications of Modulation, AM Modulation and Demodulation
  • Wireless Communication Overview: Cellular Communication Generations
  • Satellite and Radar Communication: Satellite Communication Fundamentals, Radar Communication Fundamentals

Most asked AKTU PYQ questions from Unit 5

  1. Q7b. An Audio frequency signal 10Sin(6π×400t) is used to amplitude modulate a carrier of 25sin(4π×10⁵t). Calculate: (i) Modulation Index (ii) Amplitude of each side band (iii) Total power delivered to the load of 2KΩ (iv) Bandwidth (v) Transmission efficiency (10 marks, 2021-22)
  2. Q2d. Describe AM modulation and Demodulation technique with adequate diagram. (10 marks, 2021-22)
  3. Q6b. An audio frequency signal 5Sin(2π×500t) is used to amplitude modulate a carrier of 25Sin(2π×10⁵t). Calculate: (i) Modulation index (ii) Amplitude of each side band (iii) Total power (iv) Bandwidth (v) Transmission efficiency (10 marks, 2021-22)
  4. Q2e. Explain Amplitude modulation. Derive the expression for the total power radiated by the modulated signal. Also calculate modulation efficiency. (10 marks, 2021-22)
  5. Q2e. An AM wave is represented by the expression: V = 5 (1 + 0.6 cos 6280 t) sin 211 × 10⁴ t volts (i) What are the minimum and maximum amplitudes of the AM wave? (ii) What frequency components are contained in the modulated wave and what is the amplitude of each component? (7 marks, 2024-25)
  6. Q7a. A sinusoidal carrier voltage of frequency 1 MHz and amplitude 100 volts is amplitude modulated by the sinusoidal voltage of frequency 5 kHz producing 50% modulation. Calculate the frequency and amplitude of lower and upper sideband terms. (7 marks, 2024-25)
  7. Q7a. In an amplitude-modulated wave, derive the expression for (i) Amplitude of sidebands (ii) Sideband frequencies (iii) Modulation Index (iv) Modulation Efficiency (7 marks, 2023-24)
  8. Q7a. An audio frequency signal 10Sin2π × 500t is used to amplitude modulate a carrier of 50Sin 2π × 10⁵t. Calculate: (i) Modulation index (ii) Amplitude of Each side band (iii) Total power delivered to the load of 2KΩ (iv) Bandwidth (7 marks, 2022-23)
  9. Q6a. (i) Describe briefly Satellite Communication. (ii) Explain Positive and Negative Clamper using suitable circuit diagram and input/output waveform. (10 marks, 2021-22)
  10. Q7a. Why do we need modulation? The antenna current of an AM transmitter is 8A when only the carrier is sent, but it increases to 8.93A, when the carrier is modulated by a single sine wave. Find percentage modulation. Determine the antenna current when the percent of modulation changes to 0.8. (10 marks, 2021-22)

AKTU paper codes: BEC101, BEC201, KEC101, KEC201

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