JNTU
JNTU B.Tech III ANALOG COMMUNICATIONS Previous Question Paper (August/September - 2024 - R13)
Note: i) Question paper consists of Part A, Part B. ii) Part A is compulsory, which carries 25 marks. In Part A, Answer all questions. iii) In Part B, Answer any one question from each unit. Each question carries 10 marks and may have a, b as sub questions.
Part A
What is Frequency division multiplexing?
Answer
Frequency Division Multiplexing (FDM) is a technique where the total available bandwidth of a communication channel is divided into a series of non-overlapping frequency sub-bands, each of which is used to carry a separate signal simultaneously.
Explain the need of modulation in communication system.
Answer
Modulation is essential for several reasons:
- Antenna Size Reduction: Efficient radiation requires antenna dimensions comparable to the signal wavelength; modulation shifts low-frequency baseband signals to high frequencies, significantly reducing antenna size.
- Multiplexing: It allows multiple signals to share the same transmission medium by assigning them different carrier frequencies.
- Improved Signal-to-Noise Ratio: It helps in minimizing interference and allows for easier signal processing and amplification.
What are the advantages of SSB-SC over DSB-SC?
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What are the advantages of VSB and mention its applications?
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What is the Transmission bandwidth of FM Wave?
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Compare FM and AM.
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What are Arbitrary Noise Sources?
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What are the sources of shot noise?
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List the characteristics of RF section.
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What is Amplitude limiting?
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Part B
Write the time domain and frequency domain equation of amplitude modulated signal. Describe its generation using Switching modulator.
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What is the effect of frequency and phase error in demodulation of DSB-SC wave using synchronous detector.
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Draw the block diagram of the frequency discrimination method of generating SSB waves and explain its working.
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What is the need of VSB modulation and explain the Generation VSB signal with necessary expressions and spectral representation.
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Explain Armstrong method of generating FM signals with a neat block schematic diagram.
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What is meant by threshold effect in FM?
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Discuss the process of Detection of FM Waves by Phase locked loop.
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Discuss about Noise Triangle in Angle Modulation System.
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Explain about Average Noise Figure of cascaded networks.
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Discuss the In phase and quadrature phase components and their Properties.
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Derive the expression for figure of merit of AM systems.
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With a neat sketch, explain Time Divison multiplexing.
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Draw the block diagram of superhetrodyne FM receiver and explain the function of each block.
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