Total No. of Questions: 05 Total No. of Printed Pages: 02 Time: 3 Hrs. Roll No.: _ BTEC 105 B.Tech. [CCE] I Year Examination, December 2017 Analog and Digital Communication Choice Based Credit System (CBCS) Maximum Marks : 60 Minimum Pass Marks: 24 Note: (1) All questions carry equal marks, out of which part 'A' and '8' carry 3 marks and part 'C' carries 6 marks. ~ (2) From each question, part 'A' and '8' are compulsory and part 'C' has internal choice. (3) Draw the neat diagram, wherever necessary. (4) Assume suitable data wherever necessary. Q.1.(A) (8) (C) ..•.....•.. l.2.(A) (8) (C) Define Signals. Briefly explain various types of signals. Find the Fourier transform of everlasting sinusoid sinwot. Also draw its spectrum. State and Prove the Parseval's theorem for power signal and also define power spectral density. OR State and Prove the time shifting and frequency shifting properties of Fourier transform . Define modulation and demodulation. Why modulation is needed? Briefly explain the block diagram of Communication System. Explain the working of Envelope Detector. ../ OR A carrier Accoswct. is amplitude modulated by a single tone modulating signal met) = Amcoswmt. derive the expression for Amplitude modulation. Also compute its spectrum, bandwidth and total power transmitted. Contd . 1 • 03 03 06 03 03 06