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PRINCIPLES OF COMMUNICATION ENGINEERING QUESTION BANK
UNIT - I AMPLITUDE MODULATION PART- A (2 MARKS) 1. Define amplitude modulation? 2. What is AM envelope? 3. Write the bandwidth of AM? 4. What is the need of modulation index? 5. Which one is called as percent percent modulation? 6. Define low level modulation? 7. Define heterodyning? 8. Calculate the the BW of FM signal whose frequency frequency deviation is 75 KHZ and signal frequency is 2.5 KHZ? 9. What are the two major limitations of the standard form of amplitude modulation? 10. Define modulation index for AM?
PART- B 1. Draw the amplitude modulated wave equation and explains each term with the help of frequency spectrum
(16)
2. a) Define amplitude modulation. Derive an expression for the AM wave.
(8)
b) Explain in detail about am voltage distribution 3. a) Draw the block diagram high level AM transmitter and explain the function of each block.
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b) Derive the waveform of power relation between carrier power and total transmitter power of AM signal.
(8)
4. a) Draw the waveform AM signal for over modulation, under modulation and 100% modulation
(8)
b) With the help of neat block diagram explain functioning of a super heterodyne receiver list out signifance.
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5. a) State the advantage, disadvantage and applications of AM
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b) With the help of block diagram explain the operation of a low level AM transmitter 6. a) Explain the detection of AM signals using envelope detector. b) Mention the draw backs of a TRF Receiver.
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UNIT II ANGLE MODULATION PART- A (2 MARKS) 1. What is angle modulation? 2. Define phase modulation? 3. Illustrate the relation between frequency modulation and phase modulation? 4. What is phase deviation? 5. What is modulation index of PM? 6. Write the advantages and disadvantages of FM compared to AM? 7. State Carsons rule of FM bandwidth? 8. Write the advantage of angle modulation over amplitude modulation? 9. How the angle modulated wave forms are classified defends upon modulation index value? 10. Distinguish between narrow band FM and wide band FM?
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PART - B 1. a) Explain the direct method of producing FM with block diagram
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b) Draw the block diagram of an FM transmitter and FM wave form modulating signal of EM sin >t.
(8)
2. a) Distinguish between FM and AM
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b) Explain the pre-emphasis and de-emphasis used in FM Transmitter and receiver 3. a) Explain the process of demodulating FM signal using PLL. b) Discuss about FM and PM waveforms.
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4. Draw the block diagram of wideband FM transmitter based on Armstrong method of FM generation. Explain its operation.
(16)
5. Explain the following i) Narrow band and wideband of FM signal
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ii) Direct and indirect methods of FM generation
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6. Draw the block diagram of an FM receiver and explain the working of same. UNIT - III DIGITAL MODULATION PART- A (2 MARKS) 1. Bring out the difference between DPSK and BPSK? 2. Mention any four advantage of digital modulation over a nalog modulation? 3. Define peak frequency deviation for FSK? 4. What are the advantages of M-ary signaling scheme? 5. Define Deviation ratio? 6. What is meant by frequency shift keying? 7. What do you meant by M-ARY encoding?
(16)
8. Define FSK bite rate and baud? 9. What are all the types of FSK system and explain them? 10. Define DPSK? PART - B 1. Explain in detail about the generation and co-herent detection of QPSK signal with neat block diagram
(16)
4 2. Explain the process of generating and detecting DPSK signal with the help of block diagram and given binary data sequence assigning starting reference bit as one 0010010011.
(16)
3. Explain BPSK transmitter and receiver with the help of block diagrams. (16) 4. a) Illustrate the basic idea of correlative coding by considering the specific example of duo binary signaling
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b) Mention the major drawback of detective original binary sequence from the duo binary coder output and suggest a practical means of avoiding that drawback 5. Explain the generation and detection of DPSK signal.
(8)
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6. With block diagram explain M-ary PSK Receiver. Compare M-ARY Modulation schemes? (16) UNIT- IV BASEBAND DATA TRANSMISSION PART-A (2 MARKS) 1. State sampling theorem? 2. What is aliasing? 3. What is PAM?
4. Define source coding theorem? 5. What is Nyquist rate? 6. What is inter symbol interference? 7. What is the purpose of using eye pat tern? 8. Define adaptive delta modulation? 9. What are the types of sampling? 10. What ARE the properties of PAM SIGNALS?
PART B 1. a) Explain inter symbol interference and eye pattern . b) State and prove sampling theorem.
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2. a) Draw the eye diagram and explain its importance in data transmission. b) Explain adaptive delta modulation.
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3 . What are the drawbacks in delta modulation and how they are overcome in adaptive delta modulation? Explain with the help of neat diagram.
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4. a) Describe base band M-ary PAM system for the case of quaternary(M=4)system.
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b) Explain about the basic elements of base band binary PAM system with neat block diagram.
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5. Explain in detail the Nyquist criterion for distortion less transmission of base band PAM signal
(16)
UNIT - V SPREAD SPECTRUM AND MULTIPLE ACCESS TECHNIQUES PART- A (2 MARKS) 1. Define spread spectrum?
2. List out the various applications of spread spectrum communication? 3. List out various speech coding techniques? 4. Define processing gain? 5. List out the different types of frequency hopping? 6. Compare DS-SS AND FH-SS? 7. List out major multiple access technique? 8. List out any two features of TDMA? 9. Write the problems in CDMA? 10. Why speech coding is done by wireless technique? PRINCIPLES OF COMMUNICATION
PART - B 1. With the help of neat block diagram explain DS spectrum system with coherent binary PSK.
(16)
2. Draw the block diagram of simple PN sequence generator using shift register and obtain the output sequence. For this output sequence verify the properties of the PN sequence. (16) 3. What is frequency HOP spread spectrum? Explain the generation of slow frequency HOP spread M-ary FSK and fast frequency HOP spread M-ary FSK with appropriate diagrams. (16) 4. a) What is spread spectrum modulation? Describe the following features of spread spectrum modulation. i) Anti jamming ii) Ranging iii) Multiple accessing iv) Message security
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b) Compare FDMA, TDMA and CDMA.
(8)
5. Explain the working of multi pulse excited LPC and CODE excited LPC by suitable diagrams.
(16)
6. Explain CDMA system with its features. List out various problems available in CDMA system.
