Anna University -Study Materials for all Departments # CS2204/CS36/EC1207/10144 CS 305/080230008- Analog and Digital Communication (ADC) UNIT I Part B Question Bank

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CS2204/CS36/EC1207/10144 CS 305/080230008- Analog and Digital Communication (ADC) UNIT I Part B Question Bank
Department of Computer science and Engineering

Meant for Anna University Coimbatore,trichy,trinelveli

Question Bank
(Regulation 2008/2010)
___________________________________________________________________________________
Details:
Year: second Year
Department: B.E Computer Science and Engineering
Semester:Three(III)
Content: CS2204/CS36/EC 1207/10144 CS 305/080230008- Analog and Digital Communication (ADC) UNIT I Part A Question Bank
Subject code: CS2204/CS36/EC1207/10144 CS 305/080230008
Subject Name: Analog and Digital Communication (ADC)
Unit Number: 1
Part: B
Regulation: 2008 or 2010 or 2013
Post Type: Question Bank

QUESTION BANK

UNIT -I
PART- B (2 MARKS)

1.(i) What is the principle of Amplitude modulation? Derive expression for the AM wave and
draw its spectrum. (8)
(ii) Describe the frequency analysis of Angle modulated waves. Explain their Bandwidth
requirements. (8)
2) (i) A modulating signal of 2 cos5000t is amplitude modulated over a carrier signal of
5cos20000t . Derive expressions for the modulation index, LSB and VSB frequencies,
Bandwidth and the ratio of Side Band Power in the Total Power of AM wave. (8)
(ii) Explain the principle of Angle Modulation. Derive and explain phase deviation, Modulation
index, frequency deviation and percent modulation. (8)
3) (i) Write short notes on :
(1) AM voltage distribution. (4)
(2) AM power distribution. (4)
(ii) An audio frequency signal 10 sin 2500t is used to amplitude modulate a carrier of
50 sin 5*3.14*10^5 t. Calculate
(1) Modulation index (2)
(2) Side band frequencies (2)
(3) BW required (2)
(4) Total power delivered to the load of 600 . (2)
4) (i) Compare FM and AM. (12)
(ii) The phase deviation constant in a phase modulation system is K = 0.01 rad/v. Calculate
the maximum phase deviation when a modulating signal of 10 V is applied? (4)
5) In angle modulation, explain frequency deviation, percent modulation, phase deviation and
modulation index with suitable example.
6) (i) Derive the expression for a Amplitude Modulated wave and draw its spectrum. (10)
(ii) Obtain a relationship between carrier and side band powers in an AM DSBFC wave and
explain how power distribution takes place in AM DSB FC system. (6)
7) (i) Define modulation index for FM and PM and obtain the relation between modulation
index and modulating signal for FM and PM.
modulation.
8) (i) Distinguish between FM and PM by giving its mathematical analysis. (8)
(ii) Derive the relationship between the voltage amplitudes of the side band frequencies and
the carrier and draw the frequency spectrum. (8)
9) In an AM modulator, 500 KHz carrier of amplitude 20 V is modulated by 10 KHz
modulating signal which causes a change in the output wave of 7.5 V . Determine :
(1) Upper and lower side band frequencies
(2) Modulation Index
(3) Peak amplitude of upper and lower side frequency
(4) Maximum and minimum amplitudes of envelope

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