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VALLIAMMAI ENGINEERING COLLEGE

SRM Nagar, Kattankulathur – 603 203

DEPARTMENT OF

ELECTRONICS AND INSTRUMENTATION ENGINEERING

QUESTION BANK

VI SEMESTER

EC6651 – Communication Engineering

Regulation – 2013

Academic Year 2017 – 18

Prepared by

Dr. S.C. Prasanna, Assistant Professor/EIE

Ms. V.P. Sandhya, Assistant Professor/EIE

VALLIAMMAI ENGINEERING COLLEGE SRM Nagar, Kattankulathur – 603 203.

DEPARTMENT OF ELECTRONICS AND INSTRUMENTATION

ENGINEERING

QUESTION BANK SUBJECT : EC6651 Communication Engineering

SEM / YEAR: VI / III

UNIT I - ANALOG COMMUNICATION

SYLLABUS

AM – Frequency spectrum – vector representation – power relations – generation of AM – DSB, DSB/SC, SSB,

VSB AM Transmitter & Receiver; FM and PM – frequency spectrum – power relations: NBFM & WBFM,

Generation of FM and DM, Armstrong method & Reactance modulations : FM & PM frequency.

PART – A

Q.No Questions BT Level Competence

1. What is the need for modulation? BTL 1 Understand

2. Give the characteristics features of spectrum of AM Wave. BTL 2 Understand

3. Generalize the significance of modulation index. BTL 6 Create

4. Define modulation coefficient and percent modulation. BTL 1 Remember

5. A carrier signal with power of 40 watts is amplitude modulated by a

sinusoidal signal. Calculate the power of the modulated signal if the

modulation index is 0.7.

BTL 3 Apply

6. Define critical frequency. BTL 1 Remember

7. One input to a conventional AM modulator is a 500 kHz carrier with the

amplitude of 20 Vp. The second input is 10 kHz modulating signal that is

of sufficient amplitude to cause a change in the output wave of ± 7.5 Vp.

Evaluate: (a) Upper and lower side frequency, (b) Modulation efficiency.

BTL 5 Evaluate

8. For an AM DSBFC modulator with a carrier frequency fc = 100 kHz and a

maximum modulating signal frequency fm = 5 kHz, evaluate the frequency

limits for the upper and lower sidebands.

BTL 5 Evaluate

9. Give the disadvantages of single side band transmission BTL 2 Remember

10. Define depth of modulation in AM. BTL 1 Remember

11. What is image frequency? Analyze how it is rejected? BTL 4 Analyze

12. Explain, why is VSB preferred for TV video transmission? BTL 4 Analyze

13. What is the difference between VSB and SSB modulations? BTL 1 Understand

14. An AM transmitter is modulated by three source of audio with m1=0.5,

m2=0.7, m3=0.4. The unmodulated carrier power is 50 kw. Calculate the

modulated power output.

BTL 3 Apply

15. AM transmitter radiates 9 KW with the unmodulated carrier and 10.125

KW when carrier is sinusoidally modulated. Calculate the modulation

index.

BTL 3 Apply

16. Define modulation index of FM. BTL 1 Remember

17. Summarize the difference between amplitude modulation and frequency

modulation. BTL 2 Understand

18. Summarize the advantage of FM over AM. BTL 2 Understand

19. Compare NBFM and WBFM. BTL 4 Evaluate

20. Formulate the relationship between phase and frequency modulation. BTL 6 Create

PART – B

1. Solve the expression for the amplitude modulated wave and its power

relation and give the time and frequency domain representation of AM

wave. (13)

BTL 3 Apply

2. Explain with neat circuit, generation of AM wave. For an AM DSBFC

modulator with carrier frequency fc = 100 KHz and a maximum

modulating signal frequency fm = 5 KHz, evaluate bandwidth and sketch

the output frequency spectrum. (13)

BTL 5 Evaluate

3. (i) Explain the method of generating a single sideband signal using

balanced modulators. (7)

(ii) Discuss the principle of AM based radio frequency receiver with block

diagram. (6)

BTL 4

BTL 2

Analyze

Understand

4. Discuss in detail about the working of a SSB transmitter and receiver. (13)

BTL 2 Understand

5. Name the methods used for the suppression of unwanted side band in AM

transmission. Describe the working of any one of them. (13) BTL 1 Remember

6. List out the relative merits of high level modulation and low level

modulation in AM transmission. The anode dissipation of a class C power

amplifier is 944 watts when modulation depth is 60%, the efficiency of a

power amplifier is 60%, while that the modulator is 25%. Find.

(i) Carrier power and modulator tube dissipation

when modulation depth is 100%

(ii) AF output and rating of the modulation value to

affect 100% modulation.

(iii) Overall efficiency at 60% modulation depth. (13)

BTL 1

BTL 3

Remember

Apply

7. (i) Draw the block diagram for generation of VSB signal and explain the

principle of operation. (8)

(ii) With suitable sketch discuss about square law detector. (5) BTL 2 Understand

8. (i) Analyze how the phase-shift method efficiently suppresses the

unwanted side band? Explain with diagram. (9)

(ii) Explain any one AM demodulation method. (4)

BTL 4

BTL 2

Analyze

Understand

9. (i) Describe with neat diagram about the operation of a super heterodyne

receiver. Also tabulate the comparison of its performance with TRF

receiver. (10)

(ii) Tabulate the comparison about the features of FM with AM. (3)

BTL 1

Remember

10. Describe the working of direct and indirect method of generation of FM

signal. (13)

BTL 1 Remember

11. (i) Compare wide band and narrow band FM system. (3)

(ii) Discuss the Armstrong method of FM generation. (10) BTL 4

BTL 2

Analyze

Understand

12. (i) Derive the equation for the spectrum of FM signal (7)

(ii) List the merits of having RF amplifier in AM receivers. (6) BTL 6

BTL 4

Create

Analyze

13. (i) For a modulation coefficient m=0.2 and an unmodulated carrier power

Pc=1000W, calculate the total sideband power, upper and lower

sideband power, modulated carrier power and total transmitted power.

(7) (ii) With a neat block diagram explain the frequency division multiplexing

applied in AM broadcast. (6)

BTL 3

BTL 4

Apply

Analyze

14. (i) Explain the envelope detector circuit used for AM demodulation.

(8) (ii) What is meant by image frequency rejection? Calculate the image

frequency at 1000 kHz, for an AM receiver. (5)

BTL 4

BTL 1

Analyze

Remember

PART – C

1. A telephone transmitter using AM has unmodulated carrier output power of 20

kW and can be modulated to a maximum depth of 80% by a sinusoidal

modulating voltage without causing overloading. Evaluate the value to which

unmodulated carrier power may be increased without resulting in overloading

if the maximum permitted modulation index is restricted to 60%. (15)

BTL 5 Evaluate

2. For a receiver with IF and RF frequencies of 455 kHz and 900 kHz

respectively, compute local oscillator frequency, image frequency and

image frequency rejection ratio for Q of 80. (15)

BTL 6 Create

3. Explain the operation of Foster-seeley discriminator with the Schematic

diagram, Vector diagrams for 𝑓𝑖𝑛=𝑓𝑜 , 𝑓𝑖𝑛<𝑓𝑜 and 𝑓𝑖𝑛>𝑓𝑜 (15) BTL 5 Evaluate

4. A certain transmitter radiates 10.125kW with the unmodulated carrier of 9

kW,Calculate the modulation index and percent of modulation. If another

sine wave corresponding to 40% modulation is transmitted simultaneously

determine the total radiated power. (15)

BTL 6 Create

UNIT II - DIGITAL COMMUNICATION

SYLLABUS

Pulse modulations – concepts of sampling and sampling theorem, PAM, PWM, PPM, PTM,

quantization and coding: DCM, DM, slope overload error. ADM, DPCM, OOK systems – ASK, FSK,

PSK, BSK, QPSK, QAM, MSK, GMSK, applications of Data communication.

PART – A

Q.No Questions BT

Level Competence

1. What are the elements of digital communication system? BTL 1 Remember

2. Define sampling theorem. BTL 1 Remember

3. Discuss about aliasing. BTL 2 Understand

4. Why flat top PAM is preferred over natural PAM? BTL 3 Apply

5. List the four most common methods of pulse modulation. BTL 1 Remember

6. Summarize the advantages and disadvantages of digital modulation. BTL 5 Evaluate 7. Define quantization error. BTL 1 Remember

8. Mention any two advantages of MSK. BTL 2 Understand

9. Discuss about the slope overload distortion. BTL 2 Understand

10. Draw the block diagram of an adaptive modulator. BTL 1 Remember

11. Generalize the purpose of clock recovery circuit. BTL 6 Create

12. Analyze, why FSK is preferred over ASK? BTL 4 Analyze

13. Compare ASK, FSK and PSK. BTL 5 Evaluate

14. Draw the block diagram of binary PSK transmitter. BTL 1 Remember

15. Point out the four possible values of the phase of the carrier in a

QPSK wave. BTL 4 Analyze

16. Explain how does the phase of carrier vary for the message m(n) = {1,

0, 1, 1, 0, 1, ...}. BTL 4 Analyze

17. For an 8–PSK system operating with an information bit rate of

24kbps, Calculate baud and bandwidth efficiency. BTL 3 Apply

18. Relate MPSK and MFSK modulation techniques with respect to their

probability of error and bandwidth. BTL 3 Apply

19. Generalize the primary difference between standard FSK and MSK. BTL 6 Create

20. Give the two primary differences between MSK and QPSK. BTL 2 Understand

PART – B

1. (i) Discuss on the process, “Companding” and its characteristics.

(5) (ii) How does flat top sampling differ from natural sampling? Discuss

about the estimation of filtered output. (8)

BTL 2

Understand

2. With a neat block diagram explain the PAM modulation and

demodulation process and describe about the expression for PAM

wave and depth of modulation. (13)

BTL 1 Remember

3. (i) Discuss the generation method of PWM. Describe how you will

convert PWM to PPM with diagram. (5)

(ii) Describe the working of pulse code modulation system with its

block diagram. (8)

BTL 2

BTL 1

Understand

Remember

4. (i) What is meant by quantization and develop the expression for

quantization noise in PCM and DM systems. (7)

(ii) Describe the working of Delta modulation system. (6)

BTL 6

BTL 1

Create

Remember

5. With neat block diagram explain the delta Modulation Scheme.

Mention its disadvantages and method to overcome. (13)

BTL 3 Apply

6. How does ADM differ from AM? Support your answer with block

diagram and waveforms. (13) BTL 5 Evaluate

7. (i) Describe in detail DPCM communication system with neat block

diagram. (7)

(ii) For minimum line speed with an 8 bit PCM for speech signal

ranging upto 1 volt. Calculate the resolution and quantization

error. Also analyze about the coding efficiency for a resolution of

0.01 volt with the 8 bit PCM. (6)

BTL 1

BTL 4

Remember

Analyze

8. (i) Compare PCM and DPCM techniques. (4)

(ii) Discuss about the working principle of ASK modulator and

detector with neat diagram. (9)

BTL 4

BTL 2

Analyze

Understand

9. (i) Compare and contrast QPSK and QAM. (4)

(ii) Sketch slope overload error and explain how that error could be

minimised? (9)

BTL 4

Analyze

10. (i) Describe Frequency shift keying method with equations. (7)

(ii) Discuss the method of modulation and demodulation in MSK

with equations and block diagrams. (6)

BTL 1

BTL 2

Remember

Understand

11. Explain QPSK with a block diagram and discuss the phasor diagram

for sinusoids. Also analyze about the bandwidth considerations for

QPSK. (13)

BTL 4

Analyze

12. For a QPSK system and the given parameters C = 10-12

W, fb = 60

kbps, N = 1.2 x 10-14

W, B = 120 kHz, determine the carrier power,

noise power, noise power density, energy per bit, carrier-to-noise

power ratio and Eb/N0 ratio. (13)

BTL 3

Apply

13. (i) Derive the Bit Error Rate (BER) expression and bit error

Probability expression for QPSK modulation. (8)

(ii) Draw and discuss ASK, FSK and PSK signal to transmit the data

stream 1111000111. (5)

BTL 6

BTL 2

Create

Understand

14. List the advantages of data communication and describe GMSK and

QAM techniques with neat diagram. (13) BTL 1

Remember

PART – C

1. State and prove sampling theorem. Obtain the reconstructed Signal

and explain about aliasing? (15)

BTL 5 Evaluate

2. A PCM system has the following parameters: a maximum analog

input frequency of 4 KHz a maximum decoded voltage at the receiver

of ±2.55 V, and a minimum dynamic range of 46dB. Evaluate the

following:

(i) Minimum sample rate. (4)

(ii) Minimum number of bits used in the PCM code. (4)

(iii)Resolution. (4)

(iv) Quantization error. (3)

BTL 5 Evaluate

3. Draw the transmitter and receiver block diagram of Binary Phase Shift

Keying Scheme and compare its error performance with Binary

Frequency shift Keying Scheme. (15)

BTL 5 Evaluate

4. (i) Compare between ASK, BPSK, QPSK and FSK digital

modulation techniques. (8)

(ii) Represent QPSK signals in the signal space to find the distance

between the signal points. Give the spectrum of QPSK signal. (7)

BTL 6 Create

UNIT III - SOURCE CODES, LINE CODES & ERROR CONTROL

SYLLABUS

Primary communication – entropy, properties, BSC, BEC, source coding: Shanon Fano, Huffman

coding: noiseless coding theorem, BW – SNR trade off codes: NRZ, RZ, AMI, HDBP, ABQ,

MBnB codes : Efficiency of transmissions, error control codes and applications: convolutions &

block codes. PART – A

Q.No Questions BT

Level

Competence

1. What is information rate? BTL 1 Remember

2. An event has six possible outcomes with probabilities {1/2, ¼, 1/8,

1/16, 1/32, 1/32}. Calculate the entropy of the system. BTL 3 Apply

3. A source transmits messages Q1 to Q5 having probabilities ½, ¼,

1/8, 1/16, 1/16 respectively. Estimate the average information of the

source.

BTL 6 Create

4. An analog signal is band limited to B Hz, sampled at the Nyquist

rate, and the samples are quantized into 4 levels. The quantization

levels Q1, Q2, Q3 and Q4 are assumed to be independent and occur

with probabilities p1=p4=81 and p2=p3=8

3. Calculate the

information rate of the source.

BTL 3 Apply

5. What is BCC and BSC? BTL 1 Remember

6. Classify the types of characters used in data communication codes. BTL 4 Analyze

7. Evaluate the Hamming distance between the following code words

C1={1,0,0,0,1,1,1} and C2={0,0,0,1,0,1,1}. BTL 5 Evaluate

8. List the properties of Hamming distance. BTL 1 Remember

9. Discuss why the Huffman code called as minimum redundancy

coding. BTL 6 Create

10. Show how many errors can be detected and corrected by a (7, 4)

Hamming code? BTL 3 Apply

11. What is the significance of source coding? BTL 1 Remember

12. Analyze about the working rule of AMI code. BTL 4 Analyze

13. Give the significance of AMI code. BTL 2 Understand

14. Name the error control schemes used in Modems. BTL 1 Remember

15. Differentiate error detection from error correction. BTL 2 Understand

16. List the different error control methods. BTL 1 Remember

17. State channel capacity theorem. BTL 2 Understand

18. Discuss about the Redundancy in Error control. BTL 2 Understand

19. Point out the inferences of vertical redundancy checking. BTL 4 Analyze

20. Compare block and convolution codes. BTL 5 Evaluate

PART – B

1. Discuss the BSC and BEC with their channel diagram and transition

matrix. (13) BTL 2 Understand

2. (i) Brief the properties of entropy. (6)

(ii) Describe the concept of noiseless coding theorem and state its

significance. (7)

BTL 1 Remember

3. Given states S={S0,S1,S2,S3,S4} and their probabilities

P={0.4,0.2,0.2,0.1,0.1}. Find coding efficiency and entropy for

Huffman coding. (13)

BTL 4

Analyze

4. (i) Five symbols of the alphabet of discrete memory less source

and their probabilities are given below.

S = { S0, S1, S2, S3, S4}

P(S) = {0.4, 0.2, 0.2, 0.1, 0.1}

Obtain code symbols using Huffman coding. (10)

(ii) Discuss the Bandwidth-SNR trade off of a communication

system. (3)

BTL 6

BTL 2

Create

Understand

5. (i) State and prove Shannon noiseless coding theorem. (10)

(ii) Consider that a source is transmitting equiprobable 1/0 at the

rate of 103 b/s and the probability error of Pe = 1/16. Determine

the rate of transmission. (3)

BTL 1

BTL 3

Remember

Apply

6. Explain various digital data formats (line coding techniques) and

compare them. (13) BTL 2 Understand

7. (i) Apply the following coding technique and obtain the output

wave form for the bit stream 10011100 on NRZ, RZ, AMI,

HDBP, ABQ and MBnB. (10)

(ii) Draw the plots for the polar, unipolar, bipolar and Manchester

NRZ line code format for an information {1 0 1 1 0 0}. (3)

BTL 3

BTL 2

Apply

Remember

8. Describe in detail about error control codes and their applications.

(13) BTL 1 Remember

9. (i) Summarize Shannon’s Fano algorithm and Huffman coding

with a suitable example. (10)

(ii) What is a convolutional code?When is it used? (3)

BTL 6

BTL 1

Create

Remember

10. Describe about the viterbi algorithm by showing the possible path

through the trellis of a coder. Assume the state diagram of any

coder. (13)

BTL 1

Remember

11. Explain the concept of coding and decoding methods of block codes

with its mathematical framework and diagram. (13) BTL 4

Analyze

12. (i) Describe how cyclic redundancy checking is used for error

detection. (7)

(ii) Explain Bandwidth-SNR trade off in source coding. (6)

BTL 4

Analyze

13. Illustrate with suitable example, any one of the decoding methods of

convolutional coding precisely. (13) BTL 3

Apply

14. Evaluate the Block check sequence (BCS) for the following data and

cyclic redundancy check(CRC) generating polynomials: data G(x) =

x7+ x

5+ x

4+ x

2+ x

1+ x

0, CRC P(x) = x

5+ x

4+ x

1+ x

0. Also Explain

the Concept of block codes and coding efficiency. (13)

BTL 5

Evaluate

PART – C

1. (i) Give the procedure for Shannon Fano coding and use the

procedure to obtain the code for the source symbols S0, S1, S2,

S3, S4, S5 with their respective probabilities 1/2, 1/3, 1/12,

1/15,1/120,1/120. (8)

(ii) For the given 8 bit stream 11010100, plot the NRZ, RZ, AMI,

HDBP and Differential Manchester codes. (7)

BTL 5

Evaluate

2. The parity check matrix of a particular (7,4) linear block code is

given by, [𝐻]= 1110100

1101010

1011001

(i) Find the generator matrix (G). (4)

(ii) List all the code vectors. (4)

(iii) What is the minimum distance between code vectors? (4)

(iv) How many errors can be detected? How many errors can be

corrected? (3)

BTL 5

Evaluate

3. (i) Summarize about various error control codes with one example

for convolution code. (10)

(ii) Describe in detail about convolutional coder of constraint

length 6 and rate efficiency ½. (5)

BTL 6

Create

4. A rate 1/3 convolution encoder has generating vectors as g1=(1 0 0)

, g2=(1 1 1) and g3 = (1 0 1)

(i) Sketch the encoder configuration. (8)

(ii) Draw the code tree, state diagram and trellis diagram. (7)

BTL 6 Create

UNIT IV-MULTIPLE ACCESS TECHNIQUES

SS&MA techniques : FDMA, TDMA, CDMA, SDMA application in wire and wireless

communication:Advantages (merits)

PART - A

Q.No Questions BT

Level Competence

1. List any four primary applications of FDMA. BTL 1 Remember

2. Point out the features of CDMA.

BTL 4 Analyze

3. Define FDMA. BTL 1 Remember

4. List out the merits of TDMA system.

BTL 1 Remember

5. Generalize the significance of CDMA techniques. BTL 6 Create

6. Discuss the applications of CDMA system. BTL 2 Understand

7. Describe near –far problem. BTL 2 Understand 8. Illustrate the popular coding sequences of CDMA system. BTL 3 Apply

9. Define multiple access.

BTL 1 Remember

10. Demonstrate the working principle of SDMA. BTL 3 Apply

11. What is the role of modem in communication networks? BTL 1 Remember

12. Illustrate the frame structure of a T1 carrier system.

BTL 3 Apply

13. Compare SDMA with CDMA.

BTL 4 Analyze

14. Point out the most critical requirement of TDMA technique.

BTL 4 Analyze

15. What are the benefits of multiple access techniques in

communication engineering?

BTL 2 Understand

16. Summarize the significance of T1 carrier system in communication

networks with an illustration.

BTL 5 Evaluate

17. Compare time division multiplexing and frequency division

multiplexing.

BTL 5 Evaluate

18. Generalize the advantages of SDMA technique.

BTL 6 Create

19. List the applications of SDMA in wire and wireless communication.

BTL 1 Remember

20. Give the advantages of CDMA system.

BTL 2 Understand

PART - B

1. Draw the block diagram and explain in detail the model of spread

spectrum digital communication system. (13) BTL 6 Create

2. Describe briefly about the operation of a typical TDMA system

with the time pattern and compare with FDMA. (13)

BTL 1 Remember

3. Explain the principle of FDMA with neat diagram. (13) BTL 4 Analyze

4. Draw and explain the block diagram of transmitter and receiver of

CDMA. (13)

BTL 1 Remember

5. (i) Demonstrate the operation of a typical TDMA system with

neat block diagram. (8)

(ii) Distinguish TDMA with FDMA. (7)

BTL 2 Understand

6. (i) What is CDMA? Explain in detail. (8)

(ii) Assess the basic features of CDMA systems. Explain soft hand

over. (7)

BTL 5

Evaluate

7. Explain with a neat block diagram the SDMA technique. (13) BTL 4 Analyze

8. Illustrate how interference is avoided by using code division

multiplexing. (13) BTL 3 Apply

9. Describe briefly about wired and wireless communication systems.

(13)

BTL 2 Understand

10. Explain the principle of operation of FHSS with necessary diagrams.

(13) BTL 2 Understand

11. (i) With neat block diagram explain the Frequency Division

Multiple Access technique. (8)

(ii) Discuss the application of FDMA in communication. (7)

BTL 4

Analyze

12. Describe about the allocation of time slot in TDMA and time

frequency characteristics of synchronous TDMA. (13) BTL 1 Remember

13. Illustrate the concept of using CDMA scheme in FDD and TDD.

(13)

BTL 3 Apply

14. Describe the structure of Code Division Multiple Access. (13) BTL 1 Remember

PART – C

1. 500 users employ FDMA to transmit 1000-bit packets of data. The

channel band width is 100MHz and QPSK is used at each of the

5000 carrier frequencies employed

(i) What is the maximum bandwidth allocated to each user? (5)

(ii) What is the bit rate employed by each user? (5)

(iii) How long does it take to transmit a packet? (5)

BTL 6 Create

2. Summarize Spread Spectrum modulation technique based upon the

operating concept and compare about DSSS and FHSS. (15)

BTL 5 Evaluate

3. In the AMPS system the system bandwidth is 12.5 MHz, the channel

spacing is 30kHz, and the edge guard spacing is 10 kHz. The number

of channel allocated for control signaling is 21. Estimate the number of

channels available for message transmission and spectral efficiency of

FDMA. (15)

BTL 6 Create

4. Compare the performance of TDMA, FDMA and CDMA techniques.

(15)

BTL 5 Evaluate

UNIT V - SATELLITE, OPTICAL FIBER – POWERLINE, SCADA

Orbits : types of satellites : frequency used link establishment, MA techniques used in satellite

communication, earth station; aperture actuators used in satellite – Intelsat and Insat: fibers –

types:sources, detectors used, digital filters, optical link: power line carrier communications:

SCADA. PART –A

Q.No Questions BT

Level Competence

1. List the channels and their data rate used in optical fiber systems. BTL 1 Remember

2. Name the types of optical fiber mode structure. BTL 1

Remember

3. For an earth station transmitter with an antenna output power of 40

dBW(10,000),a back off loss of 3 dB, a total branching and feeder

loss of 3 dB and a transmit antenna gain of 40 dB, evaluate the

EIRP.

BTL 6

Create

4. Define numerical aperture. BTL 1 Remember

5. Among LED and LASER, which is more popularly used now?

Why? BTL 4 Analyze

6. Give the essential components of a satellite system. BTL 2 Understand

7. Summarize about near-far problem. BTL 5 Evaluate

8. What is optical link? BTL 2 Understand

9. What are the different types of optical fiber? Which type is more

preferred? BTL 2 Understand

10. Illustrate the primary advantages of optical fiber systems. BTL 3 Apply

11. Examine whether single mode propagation is impossible with

graded index fiber. BTL 3 Apply

12. Define Apogee, perigee and geocenter. BTL 1 Remember

13. Explain Snell’s law. BTL 4 Analyze

14. Classify the satellite orbital patterns. BTL 4 Analyze

15. Evaluate the carrier to noise density ratio for a receiver with -

7dBW input carrier power, an equivalent noise temperature of 180

degree K and a bandwidth of 20MHz.

BTL 6 Create

16. List the merits and demerits of geosynchronous satellite. BTL 1 Remember

17. Explain the communication satellites along with their band of

frequency allocation.

BTL 5 Evaluate

18. Discuss the aperture actuators used in satellite. BTL 2 Understand

19. Mention the uplink and downlink frequency range for satellite

communication. BTL 3 Apply

20. Define azimuth angle. BTL 1 Remember

PART - B

1. (i) Compare optical fiber with RF cable. (6)

(ii) What is the relationship among single mode step index,

multimode step index and multimode graded index optical

fibers. (7)

BTL 4

Analyze

2. Describe briefly and compare the three types of optical fiber

configurations. (13)

BTL 1 Remember

3. (i) Explain the block diagram of satellite link . (7)

(ii) Describe the concept of INSAT. (6) BTL 1 Remember

4. (i) Describe the principle of operation of power line carrier

communication. (7)

(ii) Draw the block diagram of optical fiber communication link

and explain. (6)

BTL 2 Understand

5. (i) Develop the concept of satellite link budget. (7)

(ii) Demonstrate the uplink and downlink model of satellite

communication system. (6)

BTL 3

Apply

6. Explain the frequency reuse concept of cellular network. Support

your answer with the required diagram. (13) BTL 4 Analyze

7. (i) Summarize the concept of satellite communication system and

its applications. (7)

(ii) Explain in detail about the operation of any one fibre optic

source and detector. (6)

BTL 5

Evaluate

8. Identify the various blocks and its functionalities of a fiber optic

communication system. (13)

BTL 4 Analyze

9. (i) Generalize the concept of Optical sources and detectors? (7)

(ii) Compose short notes on SCADA and Intelsat. (6)

BTL 6 Create

10. Discuss in detail about the frequency reuse concept of cellular

network. Support your answer with the required diagram. (13) BTL 2 Understand

11. Discuss broadly on the multiple access techniques used in satellite

communication. (13) BTL 2 Understand

12. Describe the following.

(i) Optical detectors and their types. (4)

(ii) Satellite types. (3)

(iii) Digital filters used in satellite systems. (3)

(iv) Optical link. (3)

BTL 1 Remember

13. (i) What are the modes of operation suggested in optical fibres?

How are optical fibres classified according to this? Discuss

elaborately. (9)

(ii) State the advantages of Fiber Optic Communication. (4)

BTL 1

Remember

14. Illustrate how Kepler’s and Newton’s laws are used to describe the

orbit of a satellite? (13)

BTL 3 Apply

PART – C

1. Elaborate the concept of geostationary satellite and also about

INTELSAT and INSAT. (15) BTL 5 Evaluate

2. (i) Prepare an index profile for the optical fibre and explain various

types of fibre (10)

(ii) Generalize the concept of optical fibre link budget. (5)

BTL 6 Create

3. A multimode step index fibre with a core refractive index of 1.4917,

core diameter of 60 um and normalized frequency =12 at wavelength

of 1.3um. Calculate NA, relative index difference, critical angle and

total number of guided modes. (15)

BTL 5 Evaluate

4. A Silica optical fiber with a core refractive index of 105 and a

cladding refractive index of 1.47. Determine the critical angle at the

core-cladding interface, the numerical aperture for the fiber, and the

acceptance angle in air for both fiber. (15)

BTL 5 Evaluate

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