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
