Analog Communication - May 2016

Electronics & Telecomm. (Semester 5)

TOTAL MARKS: 80
TOTAL TIME: 3 HOURS (1) Question 1 is compulsory.
(2) Attempt any three from the remaining questions.
(3) Assume data if required.
(4) Figures to the right indicate full marks.

Solve any four of the following

1(a) Why IF is selected as 455 Khz in AM?(5 marks) 1(b) Distinguish between narrow band FM and wideband Fm.(5 marks) 1(c) What are the cause of fold over distortion? How it can be prevented?(5 marks) 1(d) Explain double spotting with reference to radio receiver.(5 marks) 1(e) Define noise figure and signal to noise ratio.(5 marks) 2(a) One input to AM modulation is 500 Khz carries with an amplitude to cause a change in o/p wave of &pm(10 marks) 2(b) Explain practical diode detector with delayed AGC.(10 marks) 3(a) Explain indirect method of FM generation.(10 marks) 3(b) Explain ratio detector in detail with suitable diagram.(10 marks) 4(a) Explain independent sideband technique in detail.(10 marks) 4(b) Explain Super heterodyne radio receiver in detail with block diagram.(10 marks) 5(a) Explain block diagram of adaptive delta modulator with waveforms.(10 marks) 5(b) State and prove sampling theorem for pass band signal.(10 marks)

Write short notes on any four of the following

6(a) PLL FM Demodulator(5 marks) 6(b) Wquadrature Amplitude Modulation(5 marks) 6(c) TDM and FDM(5 marks) 6(d) Companding(5 marks) 6(e) Aliasing Error and aperture effect.(5 marks)