JNTU
JNTU B.Tech II PRINCIPLES OF COMMUNICATIONS Previous Question Paper (December - 2017 - 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.
Part A
What frequencies are used in microwave communication?
Answer
Microwave communication typically utilizes frequencies in the range of 1 GHz to 300 GHz, corresponding to wavelengths between 30 cm and 1 mm.
Explain different types of signals.
Answer
Signals are primarily classified into two types:
- Analog Signals: Continuous-time signals that can take any value within a range, representing physical quantities like sound or temperature.
- Digital Signals: Discrete-time signals that represent data as a sequence of finite values, typically binary levels (0 and 1), providing higher noise immunity.
What are the advantages of single sideband transmission?
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What is the function of amplitude limiter in FM system?
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Specify the Nyquist rate and Nyquist interval for the signal
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Explain the difference between coherent and incoherent reception.
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A PCM system uses a uniform quantizer followed by a 7-bit binary encoder. The bit rate of the system is equal to 50×106. What is the maximum message bandwidth for which the system operates satisfactorily?
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Explain about MODEM.
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State Shannon Hartley theorem.
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Write a short note on Automatic-Repeat Request.
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Part B
Discuss the fundamental limitations of communication system.
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What are the advantages and disadvantages of Digital Communications over Analog Communications?
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Discuss about noise figure of an amplifier.
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Discuss various types and sources of noise.
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Describe the generation of AM signals using non linear devices.
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Explain a switching modulator. Draw the necessary circuit and waveform.
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Derive the expression band-width of FM.
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Explain about threshold effect in FM.
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Inter Symbol Interference.
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PPM.
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Natural sampling.
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With necessary block diagrams explain about PWM system.
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Explain Asynchronous Multiplexing.
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Draw the block diagram and explain the Delta modulation and demodulation system.
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Compare PCM and DPCM.
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Explain the generation, detection and signal space diagram of ASK system.
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Compare the performance of various coherent and non-coherent digital detection systems.
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Write short notes on: i) Mutual Information ii) Self Information iii) Logarithmic measure of Information.
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Explain the algorithm of Shannon-Fano Encoding technique.
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A source emits one of four symbols s0, s1, s2, and s3 with probabilities 1/3, 1/6, 1/4, and 1/4 respectively. The successive symbols emitted by the source are statistically independent. Calculate the entropy of the source.
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Explain about convolution codes.
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