## Tuesday, March 19, 2013

### ADVANCED RADIATION SYSTEMS MODEL QUESTION PAPER JUNE 2013 ANNA UNIV CHENNAI

M.E./M.Tech. DEGREE EXAMINATION, JUNE 2011.
M.E. – Communication Systems
First Semester
(Regulation 2010)
Time : Three hours Maximum : 100 marks
PART A — (10 ´ 2 = 20 marks)

1. State reciprocity theorem.
2. What are the disadvantages of loop direction finder?
3. Define directivity of an horn antenna.
4. List out the various feeding mechanisms of reflector type antenna.
5. List out the differences between end fire array and broad side array.
6. Define Half Power beam width of an antenna.
7. What are the various excitation techniques of the microstrip antenna?
8. What are the applications of microstrip array antenna?
9. Which antenna is called as frequency independent antenna and why?
10. Define characteristic impedance of the biconical antenna.

PART B — (5 ´ 16 = 80 marks)

11. (a) (i) Derive radiated power and radiation resistance of a half wave
dipole antenna. (12)
(ii) Calculate the effective length of an l 2 antenna. Given Rr = 73W,
( ) 2 Ae max = 0.13l and h = 120p . (4)
Or
(b) Derive reciprocity theorem for antennas. Show that the transmitting and
receiving radiation patterns of an antennas are equal.
12. (a) (i) Calculate the angular aperture for a paraboloid reflector antenna
for which aperture number is (1) 0.25 (2) 0.50 (3) 0.60. Given
diometer of reflector mouth is 10 m, calculate the position of the
focal point with reference to the reflection mouth in each case. (8)
(ii) Describe the methods of feeding a paraboloid reflector in which
primary antenna is located at focal point. (8)
Or
(b) Describe the construction and basic principle of operation of a slot
antenna with neat sketch. (16)
13. (a) (i) What is meant by dolph-chebyshev distribution for a linear array?
Show that such a distribution gives a minimum side lobe level for a
given beem width of major lobe? (8)
(ii) Explain the principle of pattern multiplication and find the array
factor of a two element array. (8)
Or
(b) (i) A broadside array operating at 100 cm wavelength consists of four
half wave dipole spaced 50 cm. Each element carries radio
frequency current in the same phase and of magnitude 0.5 amp.
Calculate (6)
(2) Half width of the major lobe.
(ii) Derive an expression for the far field pattern of an array of
n-identical isotropic point sources arranged in a line and spaced a
distance ‘d’ apart. (10)
antenna and also discuss about its excitation techniques. (16)
Or
(b) (i) Explain in detail about ring antenna construction, operation and
analyse radiation from cavity model with neat sketch. (8)
(ii) Derive input impedance of rectangular and circular patch antenna
with neat diagram. (8)
15. (a) What are the two types of antenna measurements, and explain
impedance measurement bridge method for low frequency and slotted
line method for high frequency. (16)
Or
(b) (i) Explain in detail about gain measurement by direct comparison
method. (8)
(ii) Explain in detail about antenna test range design. (8)

### APPLIED MATHEMATICS FOR COMMUNICATION ENGINEERS APRIL/MAY/JUNE QUESTION PAPER 2013

First Semester
Communication Systems
MA 9218 — APPLIED MATHEMATICS FOR COMMUNICATION
ENGINEERS
(Common to M.E Computer and Communication)
(Regulation 2009)

Subject : MA9218 APPLIED MATHEMATICS FOR COMMUNICATION ENGINEERS

Semester : I

Department : M.E. Computer and Communication/M.E. Communication Systems

Anna University Question Paper

### Optical Communication Networks Question Paper May/June Model 2013 Anna university chennai

M.E./M.Tech. DEGREE EXAMINATION, JUNE 2011.
M.E. – Communication Systems
First Semester
251102 — OPTICAL COMMUNICATION NETWORKS
(Regulation 2010)
Time : Three hours Maximum : 100 marks
PART A — (10 ´ 2 = 20 marks)

1. List the main loss mechanisms in optical fibres.
2. What are solitons? What is their advantage?
4. List the different topologies used in optical networks.
5. What is a optical add/drop multiplexer?
6. What are the services provided by the optical layer?
7. What are the functions of a routing node?
8. What is an interleaved optical multiplexer?
9. Define extinction ratio.
10. What are the goals of performance and fault management?

PART B — (5 ´ 16 = 80 marks)
11. (a) Discuss in detail, the main categories of nonlinear effects that occur in
optical communication systems. (16)
Or
(b) (i) Explain the advantages of optical amplifier over regenerators. (6)
(ii) Describe in detail, the principle of operation of an Erbium doped
fibre amplifier. (10)
12. (a) (i) Explain the advantages of SONET and SDH standards used in
optical networks. (4)
(ii) Describe the frame structure and network configurations defined
for SONET and SDH. (12)
Or
(b) (i) Discuss the main features and mode of operation of broadcast and
select networks. (10)
(ii) Explain briefly the test beds for Broadcast and select WDM
networks. (6)
13. (a) Discuss how by providing networking functions within the optical layer,
significant cost saving is achieved. (16)
Or
(b) (i) What problems are encountered in routing and wavelength
assignment? (8)
(ii) Explain how wavelength conversion can be used in fibre networks.
(8)
14. (a) (i) Explain synchronization in photonic packet switching network. (4)
(ii) Describe how synchronization is achieved using tunable delays and
optical phase lock loop. (12)
Or
(b) Describe in detail, the architecture and classification of different types of
fibre access networks. (16)
15. (a) (i) Describe the two forms of crosstalk that arise in WDM systems. (8)
(ii) Explain the approach used for crosstalk reduction. (8)
Or
(b) Discuss in detail equipment, connection and adaptation management
functions of configuration management. (16)

### Anna Univ May/June Model Questions High Performance Computer Networks Question Paper June 2011-2013

M.E./M.Tech. DEGREE EXAMINATION, JUNE 2011.
Common to M.E. – Applied Electronics/M.E. – Computer and Communication/
M.E.– Common System
First Semester
250102 — HIGH PERFORMANCE COMPUTER NETWORKS
(Regulation 2010)
Time : Three hours Maximum : 100 marks
PART A — (10 ´ 2 = 20 marks)

1. What is the difference between UNI and NNI in ATM?
2. What is the principle behind Bellman Ford routing algorithm?
3. Enlist the features of Reservation Protocol (RSVP).
4. How does the soft-state feature of RSVP allow it to adapt to failures in the
network.
5. State the principle of multiprotocol label switching (MPLS) operation.
6. What is meant by RED policy?
7. State Little’s theorem.
8. What is the need for data traffic modelling?
9. Define the term Kerberos. How does it offer authentication service over a
network?
10. List out any four MIB variables.
Question Paper Code : 31019

PART B — (5 ´ 16 = 80 marks)
11. (a) (i) Explain the layered architecture of TCP/IP. Compare with OSI
model. (10)
(ii) Describe the signaling system #7 architecture which supports.
ISDN network. (6)
Or
(b) (i) Write a brief note on variable length packet switches and Non-FIFO
input queued switches. (8)
(ii) What are the uses of DWDM in network configurations? (8)
12. (a) Discuss in detail about the various protocols available for real time
interactive multimedia applications. (16)
Or
(b) (i) What are the different scheduling services defined in multimedia
applications? Explain. (8)
(ii) Discuss the interplay between a QOS routing algorithm, RSVP and
integrated services IP. (8)
13. (a) (i) Describe the access method in VPN for remote users. (8)
(ii) What are the security issues with respect to tunneling in point to
point protocol? (8)
Or
(b) (i) Explain the difference between the leaky bucket traffic shaper and
the token bucket traffic shaper. (8)
(ii) In what way does the MPLS support for virtual private network
(VPN)? (8)
14. (a) (i) Briefly explain the buffered communication system with arriving
and departing packets. Give suitable examples. (10)
(ii) Consider a data communication system with three transmission
lines packets arrive at three different nodes with arrival rates
200 1 l = packets/sec, 300 2 l = packets/sec and 10 3 l = packets/sec
respectively. Assume that an average of 50000 same size packets
float in this system. Find the average delay/packets. (6)
Or
(b) (i) Mention the factors that make the Poisson model of data traffic a
failure in network. (4)
(ii) Describe the role of non Poisson model of data traffic in networks.
(12)
15. (a) (i) Explain the reference architecture of SNMP for managing devices
on IP network. (10)
(ii) When is IP security appropriate? When is SSC/TLS appropriate? (6)
Or
(b) (i) What is NTA and mention the role of NTA in firewall? (6)
(ii) Narrate the various types of firewalls and their features. (10)

### ANNA UNIVERSITY ME/MTECH 2013 EXAM MODEL MODERN DIGITAL COMMUNICATION TECHNIQUES JANUARY 2011

M.E./M.Tech. DEGREE EXAMINATION, JANUARY 2011.
First Semester
Computer and Communication
(Common to Communication Systems)
250101 — MODERN DIGITAL COMMUNICATION TECHNIQUES
(Regulation 2010)
Time : Three hours Maximum : 100 marks
PART A — (10 × 2 = 20 marks)
1. What is meant by coherent and non-coherent detection?
2. What are the advantages of MSK when compared to QPSK?
3. What are the disadvantages of multicarrier OFDM modulation system?
4. What is meant by guard time and cyclic extension in OFDM?
5. State Shannon’s channel coding theorem.
6. Define linear block code.
7. What is meant by systematic convolutional code?
8. What is meant by constraint length and free distance for convolutional code?
9. State Nyquist pulse shaping criterion for zero ISI.
10. What is meant by correlative coding?
Question Paper Code : 20098

PART B — (5 × 16 = 80 marks)

11. (a) (i) Explain the non-coherent detection of binary FSK signals with neat
block diagram. (9)
(ii) Explain about Gaussian MSK. (7)
Or
(b) Draw the block diagram of M-ary PSK transmitter and receiver and
explain in detail.
12. (a) Draw the block diagram of a multicarrier OFDM digital communication
system and explain function of each block in detail.
Or
(b) Explain in detail any two methods to reduce peak-to-average power ratio
in multicarrier OFDM system.
13. (a) (i) Explain orthogonal and bioorthogonal binary codes. (10)
(ii) Explain binary coded DPSK with infinite quantization. (6)
Or
(b) (i) Explain the error detecting and correcting capabilities of linear
block code. (6)
(ii) Write short notes on :
(1) BCH code and
(2) Read-Solomon Code. (5 + 5)
14. (a) A convolutional code is described by the following generator sequences :
(1 0 0) 1
g =
(1 0 1) 2
g =
(1 1 1) 3
g =
(i) Draw the encoder diagram for this code.
(ii) Draw the state and trellis diagrams for this code.
(iii) Find the code word corresponding to the message sequence 10101.
(4 + 8 + 4)
Or
(b) (i) Explain Viterbi decoding algorithm for convolutional code. (8)
(ii) Explain Turbo encoder with block diagram. (8)
15. (a) Explain duo-binary signalling scheme without and with precoder for
controlled ISI.
Or
(b) Draw the block diagram of adaptive linear equalization and explain with

### High Performance Computer Network ME Question Paper January 2013 Anna University Chennai

Subject Name : CP9212 High Performance Computer Network

Degree :ME

Semester : I

Department : ME., COMPUTER AND COMMUNICATION

### Electromagnetic Field Computation and Modeling ME Degree Question Paper Anna University Chennai January 2013

Subject Name :  PE9214 Electromagnetic Field Computation and Modeling

Degree : ME

Semester : I

Department : ME., Power Electronics and Drives

### MICROPROCESSOR AND MICROCONTROLLERS MAY/JUNE QUESTION PAPER 2013 ANNA UNIVERSITY CHENNAI

B.E/B.Tech DEGREE EXAMINATION,MAY/JUNE 2012.
FIFTH SEMESTER
ELECTRICAL AND ELECTRONICS ENGINEERING
MICROPROCESSOR AND MICROCONTROLLERS
(REGULATION 2008)
PART A-(10*2=20)
1.If the crystal oscillator freqrency is 5MHZ,calcrlate the time period to execute the instruction STA4200 in 8085 processor..
2.what is the function of PCHL instruction?
3.State the function of DSR and DTR pins in 8251?
4.what are the different operating modes of 8253 timer?
5.what physical address is represented by 4370H:5671H and 9A65H:0599H?
6.Illustrate the operation of the following instructions in 8086 processor.
(a) DAA.
(B) CBW.
7.list rhe addressing modes of 8051.
8.what is the function of PORT 3 In8051 microcontroller?
9.what is the resolution of 10 bit ASDC?
10.mention any two applications of stepper motor control.

PART A-(5*16=80 marks)

11.(a)(i) name and explain the different addressing modes used in 8085 with suotable examples.(8)
(ii) write an 8085 assembly language program to evaluate the expression w=x2+y2+z2.(8)
(OR)
(B)(i) Draw the timing diagram for the instruction IN82h of 8085 processor.(8)
(ii)explain the hardware interrupts of 8085 processor.(8)

12.(a)with neat functonal block diagram, explain the features of 8255 programmable peripheral
interface and its programming modes.(16)
(or)
(b) design a circuit to interface 8251 USART with 8085 processor to handle serial data transfer poerations.(16)

13.(a)(i) what are the flages available in 8086 processor? Explain their functions.(8)
(ii)explain the instructions supporting string operations in 8086 microprocessor. write an ALP to move a block of data starting from memory location X to memory location starting from Y.(8)
(or)
(b)(i)draw the pin diagram of 8086 CPU and explain the functions of the pins in minimum and maximum mode of operation of 8086. (10)
(ii)describe the circuit suitable for generation of multiple wait states for 8086 CPU module.(6)

14. (a)explain the architecture of 8051 microcontroller with neat block diagram.(16)
(or)
(b)(i)draw the circuit to interface 8K RAM with 8051 externally.explain the circuit.(8)
(ii)explain the timer operation in 8051 microcontroller with necessary diagrams.(8)

15. (a)An industrial monitoring system requires monitoring nine different parameters and actuating three different tasks, three parameters per task.use tnterrupt structyure.provide suitable input and output devices for accessing the system. design an 8051 microcontroller based system for this application and explain. (16)
Or
(b)draw the circuit to interface a DC motor to 8051 microcontroller.write an 8051 assembly language program to control the speed of the motor.explain the circuit and algorithm. (16)