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

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

Meant for Anna University Coimbatore,trichy,trinelveli

Question Bank
(Regulation 2008/2010)
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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
Regulation: 2008 or 2010 or 2013
Post Type: Question Bank

QUESTION BANK

UNIT -I
PART- A (2 MARKS)

1. As related to AM, what is over modulation, under modulation and 100%
modulation?
2. Define modulation index of an AM signal
3. A transmitter radiates 9 kW without modulation and 10.125 kW after modulation.
Determine depth of modulation.
4. Define the transmission efficiency of AM signal.
5. Draw the phasor diagram of AM signal.
9. Distinguish between low level and high level modulator.
10. Give the parameters of receiver.
11. Define sensitivity and selectivity.
12. Define fidelity.
13. What is meant by image frequency?
14. Need for modulation.
15. Application of AM.
16. What is meant by diagonal clipping and negative peak clipping?
17. Define envelope.
18. Distinguish between linear and non linear modulator.
19. What are the limitations of AM
20. Draw the envelope of AM
21. Differentiate phase modulation and frequency modulation.
22. When a signal m(t) = 3 cos (2p x 103t ) modulates a carrier c(t) = 5 cos (p x 106t),
find the modulation index and transmission bandwidth if the modulationisAM.
23. What do you mean by narrowband and wideband FM?
24. Give the frequency spectrum of narrowband FM?
25 Define frequency deviation in FM?
26 state Carson’s rule of FM bandwidth?
27 Differentiate between narrow band and wideband FM.?
28 What are the advantages of FM.?
29 Define PM.
30 what is meant by indirect FM generation?
31 Draw the phasor diagram of narrow band FM.
32 Write the expression for the spectrum of a single tone FM signal.
33 Define modulation index of FM and PM.
34 Differentiate between phase and frequency modulation.
35 A carrier of frequency 100 MHz is frequency modulated by a signal x(t)=20sin
36 (200¶x103 t ). What is the bandwidth of the FM signal if the frequency sensitivity
of themodulator is 25 KHz per volt?
37 What is the bandwidth required for an FM wave in which the modulating
frequency signal is 2 KHz and the maximum frequency deviation is 12 KHz?
38 Determine and draw the instantaneous frequency of a wave having a total phase
angle given by ø(t)= 2000t +sin10t.
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UNIT I Question Bank