JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD
JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD B.Tech III PRINCIPLES OF ELECTRONIC COMMUNICATIONS Previous Question Paper (August/September - 2024 - R16)
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
Give C band and S band frequency range.
Answer
The S band frequency range is 2 GHz to 4 GHz, and the C band frequency range is 4 GHz to 8 GHz.
Define modulation and mention different analog modulations.
Answer
Modulation is the process of varying one or more properties of a periodic waveform, called the carrier signal, with a modulating signal that contains information to be transmitted. The different types of analog modulation are Amplitude Modulation (AM), Frequency Modulation (FM), and Phase Modulation (PM).
Give the equation of AM system in time domain and frequency domain.
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Draw the PAM signal.
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Name different parts of telephone handset.
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Draw typical diagram of token ring LAN.
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Define Total Internal Reflection in optical fiber.
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What are the advantages and disadvantages in positioning satellite in lower orbit?
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Name different types of fading mechanisms in mobile radio environment.
Answer
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State the standard frequency bands allocated for mobile communications.
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Part B
Explain the advantages of modulation.
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What is mean by frequency translator? Discuss it.
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Give different bands of electromagnetic spectrum and their ranges.
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A two stage amplifier has gain of 150 for first stage and 100 for second stage. Express overall gain in dB.
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Explain the method of generation and detection of PAM signals with neat schematics.
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A band limited signal has a bandwidth equal to 4 KHZ. What sampling rate should be used to guarantee a guard band of 1200 Hz?
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Draw the constellation diagram for M-ary PSK System.
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Explain BPSK system transmitter and receiver with the help of diagrams.
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Explain the principles of Cross bar switching in Telecommunication.
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Given that MTBF=2000 Hrs and MTTR=4 Hrs. Calculate the unavailability for single and dual processor systems for 10 years and 20 years.
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Explain Routing Control in Packet Switching.
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What are the IEEELAN standards? List them.
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Explain the Frequency allocations for satellite services.
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Write short notes on: i) EIRP ii) Carrier to Noise Density Ratio.
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What are the losses occurred in optical fibers? Explain briefly.
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Describe with diagram optical receiver with light emitting diode.
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Explain the procedure of cell-splitting and advantages of cell sectorization.
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Describe the RFID communication and its advantages.
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Explain the following in a cellular environment. i) Hand-off mechanism ii) Cell splitting.
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Discuss the concept of Bluetooth networks.
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