Give a comparison between AM and FM systems.
[3 marks]Define modulation. Describe needs of modulation process in detail.
[4 marks]Draw the general block diagram of a communication system and briefly explain the function of each block.
[7 marks]Define Following Terms: (1) Phase Modulation (2) Modulation Index (3) Distortion
[3 marks]Describe briefly shot noise and partition noise with all details.
[4 marks]Describe the Armstrong method for generating FM waves with help of neat diagram.
[7 marks]Explain the importance of pre-emphasis and de-emphasis circuits. Also describe functioning of pre-emphasis and de-emphasis circuits with necessary detail
[7 marks]Describe Vestigial Sideband (VSB) modulation technique.
[3 marks]Draw and explain parallel tuned circuits in detail.
[4 marks]Explain the process of an SSB-SC signal generation using phase shifting method
[7 marks]Draw the waveforms at input and output of envelop detector.
[3 marks]Draw and explain Series tuned circuits in detail.
[4 marks]Two resistors, 20 kΩ and 50 kΩ are at room temperature (290K) for a bandwidth of 100kHz. Calculate thermal noise for each resistor, if two resistors are in series and if two resistors are parallel.
[7 marks]What are the advantages of delayed AGC.
[3 marks]State and explain Carson’s rule for frequency modulation.
[4 marks]Draw the general block diagram of a super heterodyne receiver and briefly explain the function of each block.
[7 marks]Discuss drawbacks of direct method for FM generation.
[3 marks]Explain Phased Look Loop with all necessary details.
[4 marks]List out the main functions of the communication radio receiver circuits. Also define the following terms related to radio receiver: (1) Selectivity (2) Fidelity (3) Sensitivity.
[7 marks]Explain skin effect in detail.
[3 marks]Describe utilization of HAM radio in natural calamities.
[4 marks]Define noise factor and noise temperature. Derive the Friss’s formulae for noise factor when amplifiers are in cascade connection.1
[7 marks]State and Explain Parseval’s theorem.
[3 marks]Describe briefly about the HAM radio.
[4 marks]Define the terms. (i) Signal Bandwidth (ii) Power Spectral Density State and prove time shifting property of Fourier transform.
[7 marks]