JNTU
JNTU B.Tech II PRINCIPLES OF COMMUNICATIONS Previous Question Paper (May - 2019 - R13)
Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks and may have a, b, c as sub questions.
Part A
What are the primary resources of any communication system?
Answer
The primary resources of any communication system are bandwidth and power. These two factors determine the capacity and efficiency of information transmission.
Explain White noise.
Answer
White noise is a type of random noise that has a constant power spectral density across all frequencies in the spectrum. It is analogous to white light, which contains all visible frequencies, and is often used as a model for thermal noise in electronic circuits.
What are the disadvantages of conventional (or) double side band full carrier system?
Answer
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What are the advantages of FM over AM?
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What sampling rate would be appropriate for a television video channel with a maximum bandwidth of 4 MHz?
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Explain Asynchronous Multiplexing.
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Define and explain the necessity of a compander.
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Write a short note on modems.
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Define information rate.
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What is mean by coding efficiency?
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Part B
With the help of block diagram explain the elements of Electrical Communication systems.
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Explain various sources of noise.
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Explain the calculation of noise in linear systems.
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Describe the relationship between the carrier and sideband powers in an AM wave.
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Draw the circuit and explain the generation of SSB-SC wave using phase shift method.
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Explain how FM can be generated from PM.
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Compute the bandwidth requirement for the transmission of FM signal having a frequency deviation 75 KHz and an audio bandwidth of 10KHz.
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With neat wave forms explain about:
Natural PAM sampling.
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Flat-top PAM sampling.
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With the help of waveform illustrations explain different types of pulse modulation systems.
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Explain with a neat block diagram the PCM system.
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Draw the block diagram of Adaptive Delta Modulation and explain its working.
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Describe in detail with block diagram the binary ASK, FSK schemes.
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Write short notes on the following:
Mutual Information.
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Self Information.
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Logarithmic measure for information.
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Write short notes on the following:
Linear block Codes.
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Convolution Codes.
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