Engineering BE Computer Engineering Sem 3 May 2024 2024 Electronics Circuits And Communication Fundamentals Question Paper - Mumbai University | munotes

Questions asked in this paper

1. Q1 Solve any four 20 marks
   • (a) Draw and explain in brief the output characteristics of CE configuration
   • (b) Inthe Colpitts oscillator, and C2 If the frequency of the oscillator is 10kHz,find the value of the inductor and the required gain
   • (c) Draw and explain in brief: block diagram of typical OP-AMP
   • (d) Draw and explain in brief: block diagram of the SSB modulation system
   • (e) Draw and explain basic block diagram of the digital communication
2. Q2 (a) Discuss the principle of amplitude modulation .Draw and explain the block diagram of the A M transmitter 10 marks
   • (b) State necessity of biasing. Draw circuit and explain collector feedback 10
   • (a) Draw the equivalent op-amp circuit and draw and explain the transfer characteristics of Op-Amp 10
   • (b) In an inverting amplifier the input voltages are 5Vpp and 3Vpp with operating frequency of 3kHz draw the circuit diagram and output waveform for the given input voltages 10
3. Q4 (a) Explain Frequency demodulation using Foster—Seely discriminator. 10 marks
   • (b) Inalow level AM modulator with a modulation coefficient m=0.8 a quiescent gain Aq =100,an input carrier frequency fe=500kHz with amplitude and a 1000Hz modulating signal find the maximum and minimum voltage gains and the respective output voltage 10
   • (a) Determine the deviation ratio and worst-case bandwidth foran FM system with a maximum frequency deviation of 40kHz and a maximum
   • (b) Explain: Information (41) Entropy (iii) Information rate (iv) Channel 10
4. Q6 (a) Write Short notes (Any Four) 20 marks
   • (i) comparison of DM and ADM

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