BTEC 105 B.Tech. [CCE] I Year Examination, December 2017 Analog and Digital Communication ·...
Transcript of BTEC 105 B.Tech. [CCE] I Year Examination, December 2017 Analog and Digital Communication ·...
Total No. of Questions: 05 Total No. of Printed Pages: 02
Time: 3 Hrs.
Roll No.: _
BTEC 105B.Tech. [CCE]
I Year Examination, December 2017
Analog and Digital CommunicationChoice Based Credit System (CBCS)
Maximum Marks : 60Minimum 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 .
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06
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Q.3.(A) Define Angle modulation. Explain how Phase Modulation (PM) can be obtained
from Frequency Modulation (FM). 03
(8) Briefly explain Phase Locked Loop (PLL) detector with block diagram. 03(C) Explain the generation of FM using Direct method. 06
OR
Derive an expression for frequency modulated wave. Also define frequency
deviation and modulation index of FM.
Q.4.(A)
(8)
(C)
Q.S.(A)
."
Define: Bit rate, Baud rate and Nyquist rate.
What is aliasing and how it can be reduced?
Explain Pulse code modulation with its block diagram?
OR
Derive the expression for flat top sampled signal and also obtain its spectrum.
(8)
Write mathematical expression of Binary frequency shift keying (BFSK). What is
the bandwidth of BFSK and M-ary FSK?
Define Binary Phase Shift Keying. Sketch the BPSK waveform for the input binary
sequence 1 1 0 1 0 0 1 0 1 1
Explain the generation of QPSK. Also draw its spectrum and find the bandwidth.
OR
Explain Quadrature amplitude modulation in detail.
(C)
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0303o , .
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