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Previous Year Exam Questions for Communication Engineering - CE of 2017 - bput by Verified Writer

  • Communication Engineering - CE
  • 2017
  • PYQ
  • Biju Patnaik University of Technology Rourkela Odisha - BPUT
  • Electrical and Electronics Engineering
  • B.Tech
  • 145 Offline Downloads
  • Uploaded 1 year ago
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Q3 a) Explain the principle of Armstrong method of FM generation. How is the narrow band FM converted into wide band FM to achieve desired carrier frequency as well as deviation? b) An AM transmitter has an unmodulated carrier power of 10 KW. It can be modulated by a sinusoidal modulating voltage to a maximum depth of 40% without overloading. If the maximum modulation index is reduced to 30%, what is the extent up to which the unmodulated carrier power can be increased without overloading? (5) Q4 (10) A signal m(t), bandlimited to 3 KHz is sampled at a rate of % higher than Nyquist rate. The maximum acceptable error in the (5) sample amplitude is 0.5% of the peak amplitude mp. The quantized samples are binary coded. Find the minimum bandwidth of a channel required to transmit the encoded binary signal. If 24 such signals are time division multiplexed, find the minimum transmission bandwidth required to transmit multiplexed signals. Q5 a) A PCM system has an uniform quantizer followed by a n-bit encoder. Show that the r.m.s. signal to noise ratio is approximately given by (1.8 + 6n) dB. Assume a sinusoidal input. b) Draw and explain the Pre-emphasis and De-emphasis circuit. What are their uses? (5) Q6 a) What is Companding? Why is it needed in PCM systems? b) What is Quantization error? Show the mean-square quantization error of a quantized signal is s 2/12, where S is the step size and error is within ±S/2 (5) (5) Q7 a) Draw and explain in brief the Super Heterodyne Receiver. b) Draw and explain PAM demodulator using sample & hold circuit. (5) (5) (5 x 2) 2 a) b) c) d) Write short notes on any two: PLL Comparison between FDM and TDM. Capture Effect Noise in AM system. Page Q8 (5)

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