VLSI Design - 7th ND09 EC1401

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B.E/B.Tech Degree Examination, November/December 2009.
Seventh Semester - 7th
Electronics and Communication Engineering
EC1401 - VLSI DESIGN
(Common to B.E.(Part-Time) Sixth Semester Regulation 2005)
(Regulation 2004)

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Part A-(10*2=20 marks)

1.What are the different MOS layers?
2.What are the two types of layout design rules?
3.Define rise time and fall time.
4.What is a pull down device?
5.What are the difference between task and function?
6.What is the difference between === and == ?
7.What is CBIC ?
8.Draw an assert high switch condition if input = 0 and input =1.
9.What do you mean by DFT?
10.Draw the boundary scan input logic diagram.





Part B - (5*16=80 marks)

11.a) Discuss the steps involved in IC fabrication process.(16)
Or
b) Describe n-well process in detail.(16)

12.a)i)Explain the DC characteristics of CMOS inverter with neat sketch.(8)
ii)Explain channel length modulation and body effect.(8)
Or
b)i)Explain the different regions of operation in a MOS transistor.(10)
ii)Write a note on MOS models.(6)

13.a)Explain in detail any five operators used in HDL .(16)
Or
b)i)Write the verilog code for 4 bit ripple carry full adder.(10)
ii)Give the structural description for priority encoder using verilog.(6)

14.a)Explain in detail the sequence of steps to design an ASIC.(16)
Or
b)Describe in detail the chip with programmable logic structures.(16)

15.a)Explain in detail Scan Based Test Techniques.(16)
Or
b)Discuss the three main design strategies for testability.(16)

Electronic Circuits I 3rd ND09 EC9202

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ANNA UNIVERSITY – CHENNAI
B.E.\B.TECH DEGREE EXAMINATION DECEMBER 2009
3rd - THIRD SEMESTER
ELECTRONICS and COMMUNICATIONS ENGINEERING.
EC9202 ELECTRONIC CIRCUITS - I

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PART A-(2*10=20)

1. Define stability factor.
2. Draw the fixed bias single stage transistor circuit.
3. Define CMRR.
4. Draw the small signal equivalent circuit of FET.
5. Two amplifiers having gain 20db and 40db are cascaded. Find the overall gain in db.
6. Define bandwidth.
7. What is theoretical maximum conversion efficiency of class A power amplifier.
8. What is distortion in power amplifiers.
9. Draw the full wave bridge rectifier circuit.
10. What are the advantages of SMPS over conventional regulators.





PART B-(5*16=80)

11. A) (i) For the transistor circuit in fig. find the Q-point. Vcc=15v, B=100, VBE=0.7V
(ii) Calculate the stability factor for a fixed bias circuit.
(Or)
B) Discuss the various techniques of stabilization of Q-point in a transistor.

12. A) For the CC transistor amplifier circuit, find the expressions for input impedance and voltage gain. Assume suitable model for transistor.
(Or)
B) (i) Discuss the working of a basic emitter coupled differential amplifier circuit (8)
(ii) Compare CB, CE and CC amplifiers. (8)

13. A) (i) Discuss the frequency response of multistage amplifiers. Calculate the overall upper and lower cutoff frequencies. (10)
(ii) Discuss the terms rise time and sag. (6) (Or)
B) Discuss the high frequency equivalent circuit of FET and hence derive gain bandwidth product for any one configuration.

14. A) (i) Derive the theoretical max conversion efficiency of class B power amplifier. (10)
(ii) Write short notes on power MOSFET amplifier. (6) (Or)
B) Describe the distortion in power amplifier and the methods to eliminate the same.

15. A) Explain the circuit of voltage regulator and also discuss the short circuit protection mechanism. (Or)
B) (i) Explain the power control method using SCR.
(ii) Design zener regulator for following specification Vin=8v to 12v; Vo=10v, RL=10kO. Assume that zener diode is ideal.

Control System - ND09 5th EC9254

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ANNA UNIVERSITY – COIMBATORE
B.E.\B.TECH DEGREE EXAMINATION DECEMBER 2009
FIFTH SEMESTER - 5th
ELECTRONICS and COMMUNICATION ENGG.
CONTROL SYSTEMS - EC9254

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PART A-(2*20=40)

1. What is the use of mason’s gain formula.
2. Give two examples for open loop and closed loop systems.
3. What do you meant by analogous systems.
4. What are the frequency domain specifications.
5. What are the advantages and disadvantages of feedback control systems.
6. How can we classify second order system based on damping ratio.
7. Define gain margin.
8. Define resonant frequency.
9. State Routh stability criterion.
10. Define Nyquist stability criterion.
11. What are the difference between state space analysis and Transfer function analysis.
12. What are root loci.
13. What is servomechanism.
14. What are the different types of controller.
15. What is synchro.
16. Name the test signals used in control systems.
17. What is polar plot.
18. Give examples for frequency response plot.
19. Write down state mode and output model of state space systems.
20. What do you mean by decomposition of transfer function.





PART B-(5*12=60)

21. A) A unity feedback system has an open loop transfer function G(s)=k/s(s+10). If the damping ratio is 0.5 determine (i) the value of k, (ii) peak overshoot, (iii) time to peak overshoot, (iv) settling time. (8) B) For a unity feedback whose G(s)=1/s(s+1) the input signal is r(t)= 4+6t+2t3. Find the generalized error coefficients. (4)

22. For the given block diagram find corresponding signal flow graph and evaluate closed loop transfer function relating to output and input.

23. Determine the value of k for a unity feedback control system have open loop transfer function G(s)H(s)=k/s(s+2)(s+4) such that (i)gain margin =20db (ii) phase margin =600.

24. Investigate the F(s) for stability using RH criterion (i) F(s) =s4+ks2+(k+1)s+2 (ii) F(s)=s4+s3+3s2+s+6 (iii) F(s)=s5+s4+2s3+2s2+6s+6

25. Obtain the state space model of the system with transfer function C(s)=s2+3s+2 in phase Variable form. R(s) s2+7s+12

26. A system characterized by the following state equation
Find (i) Transfer function of the system (ii) State transition matrix.

27. Sketch the root locus for the system with characteristic equation 1+G(s)H(s)=K(s+2)(s+3)(s+1)(s-1)

28. Find transfer function of field controlled DC servo motor.

Digital Signal Processing - ND09 5th EC9304

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ANNA UNIVERSITY – COIMBATORE
B.E.\B.TECH DEGREE EXAMINATION - DECEMBER 2009
FIFTH SEMESTER - 5th
ELECTRONICS and COMMUNICATION ENGG.
DIGITAL SIGNAL PROCESSING - EC9304

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PART A-(2*20=40)

1. Define twiddle factor of FFT.
2. The first five DFT coefficients of a sequence x(n) are X(0)=20, X(1)=5+j2, X(2)=0, X(3)=0.2+j0.4, X(4)=0. Determine the remaining DFT coefficients.
3. Calculate the number of multiplications needed in the calculation of DFT and FFT with 64-point sequence.
4. What is zero padding. What are its uses.
5. What are the desirable and undesirable features of FIR filters.
6. What is the necessary and sufficient condition for linear phase characteristics in FIR filter.
7. Define Gibb’s phenomenon.
8. Draw the direct form I structure for the second order system function
H(z)= b0+b1z-1+b2z-2
1+a1z-1+a2z-2
9. Find the digital filter transfer function H(z) by using impulse invariant method.
for the analog transfer function H(s)=1/(S+2).
10. Give any two properties of Butterworth filter.
11. What is warping effect. What is the effect on magnitude and phase responses.
12. Mention any two procedures for digitizing the transfer function of an analog filter.
13. What are the quantization errors due to finite word length registers in digital filters.
14. What is overflow oscillations. What are the methods to prevent it.
15. Define a Deadband of a filter.
16. The filter coefficient H=-0.673 is represented by sign magnitude fixed point arithmetic. If the word length is 6 bits, compute the quantization error due to truncation.
17. What are the addressing modes of TMS320C50.
18. What is the advantage of Harvard architecture of TMS320 series.
19. What is the different buses of TMS320C50.
20. What are the arithmetic instructions of C50.





PART B-(5*12=60)

21. A) Find the 8 point DFT of the given sequence x(n)={0,1,2,3,4,5,6,7} using Dif radix-2 FFT algorithm.(8)
B) Perform the circular convolution of the following two sequences using matrix method. X1(n)={2,1,2,1} , X2(n)={1,2,3,4} (4)

22. A) Design an idea Hilbert transformer having frequency response
H(ej?)=j for -p=?=0.
= - j for 0=?=p. Using rectangular window for N=11. (8)
B) Realize the following system function using minimum number of multipliers (4)
H(z)=1+1z-1+1z-2+1z-3+1z-4+z-5
3 4 4 3

23. Design a digital Butter-worth filter satisfying the constraints.
0.707=¦H(ej?)¦= for 0=?= p/2.
¦H(ej?)¦=0.2 for 3p/4=?= p.
With T=1 sec using bi-linear transformation.

24. A) The input to the system y(n)=0.999y(n-1)+x(n) is applied to an ADC. What is the power produced by the quantization noise at the output of the filter if the input is quantized to (i) 8 bits (ii) 16 bits. (8)
B) Compare fixed point and floating point arithmetic. (4)

25. A) With a neat block diagram explain in detail the architecture of TMS320C50. (8)
B) Write short notes on pipelining. (4)

26. Design a high pass filter with Hamming window with a cut-off frequency of 1.2 radians/sec and N=9.

27. Consider the transfer function H(z)=H1(z) where H1(z)=1/(1-a1z-1) and H2(z)=1/(1-a2z-1). Assume a1=0.5 and a2=0.6 and find the output round off noise power.

28. A) Calculate the DFT of the sequence X(n) = {1,1,-2,-2}. (6)
B) Find the output y(n) of a filter whose impulse response is h(n)= {1,1,1} and input signal x(n)={3,-1,0,1,3,2,0,1,2,1} using overlap save method.

Principles Of Management - ND09 5th MG1351

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ANNA UNIVERSITY – COIMBATORE
B.E\B.TECH DEGREE EXAMINATION DECEMBER 2009
FIFTH SEMESTER - 5th
ELECTRONICS and COMMUNICATION ENGG.
PRINCIPLES OF MANAGEMENT - MG1351


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PART A-(2*20=40)

1. What are the streams related to Neo-classical theory.
2. What is a system.
3. Who are all the major contributors to contingency approach of management.
4. What are the functions of management.
5. What are two views on strategy.
6. What are various types of plans based on time.
7. Define policy.
8. What is meant by good alternative.
9. What is meant by formal organization.
10. What are the benefits of staff authority.
11. What is meant by delegation of authority.
12. Define staffing.
13. Define leadership.
14. Define creativity.
15. What is meant by job enrichment.
16. What are the barriers of communication.
17. State few control techniques.
18. What are the types of managerial control.
19. Define productivity.
20. Define budget.






PART B-(5*12=60)

21. A) Explain the challenges that are faced by the management. (4)
B) Describe Henry Fayol’s principles of Management. (8)

22. A) Explain the various steps involved in planning. (8)
B) Explain the elements of most effective MBO systems.

23. A) Explain the common problems and difficulties faced in decision making process. (6)
B) Describe the four approaches of selection process. (6)

24. A) Describe the basis for departmentation. (8)
B) Explain the significance of selection process (4)

25. A) Explain the significance of staffing function. (6)
B) Describe various style of leadership. (6)

26. A) Explain the role of Non-Financial incentives in Motivation (8)
B) What are the advantages of job enrichment.

27. A) What are the characteristics features of controlling. Explain. (4)
B) Explain the process f communication.

28. A) Explain the essential elements of control system (4)
B) Describe the essential requirements for good control system. (8).

High Speed Networks - ND09 7th EC1008

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B.E/B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009
Seventh Semester - 7th
(Regulation 2004)
Electronics and Communication Engineering
EC 1008 – HIGH SPEED NETWORKS
(Common to B.E (Part Time) Sixth Semester – ECE – Regulation 2005) 


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PART A – (10 * 2 = 20 marks)

1.What does the term 'asynchronous' indicate ATM networks?
2.Mention the encoding techniques followed in Fast Ethernet.
3.Mention any four important parameters that are associated with a single server queue.
4.Write short notes on Committed Information Rate in Traffic Rate Management.
5.Write down the expression by which the RTT is computed in the original TCP implementation (i.e., without any refinements).
6.What is meant by silly window syndrome?
7.Define Quality of Service in a data network.
8.What is meant by Active Queue Management Scheme?
9.Is RTP an application layer protocol or transport layer protocol? Justify your answer.
10.What is meant by Forward Equivalence Class in MPLS networks?





PART B - ( 5 * 16 = 80 marks )

11. (a) (i) Explain the various cabling schemes and the encoding scheme followed in Gigabyte Ethernet. (8)
(ii) Discuss the relevance of CSMA/CD in Gigabyte Ethernet. (8)
OR
(b) (i) Explain the action that take place in the receiver upon receiving the HEC field in ATM networks. (8)
(ii) Explain how the GFC is used to provide the flow control at the UNI of ATM networks. (8)

12.(a) (i) An engineering firm provides each of its analyst with a personal computer, all of which are hooked up over a LAN to a database server. In addition, there is an expensive, standalone graphics workstation that is used for special purpose design tasks. During the course of a typical 8-hour day, 10 engineers will make the use of the workstation and spend an average of 30 minutes at a session. Manager is satisfied with this arrangement since the utilization factor of the work station is only 5 hours out of 8. The engineers complain that the wait time for using the work station is long, often an hour or more, and are asking for more workstations. Explain the queuing analysis that should be done by the engineers to convince the manager.(10)
(ii) Explain the choke packet congestion control mechanism. (6)
OR
(b) (i) Consider a LAN with 100 personal computers and a server that matintains a common database for a query application. The average time for the server to respond to a query is 0.6 seconds, and the standard deviation is estimated to equal the mean. At peak times, the query rate over the LAN reaches 20 queries per minute. Answer the following questions.
(1) What is the average response time ignoring line overhead? (2)
(2) If a 1.5 second response time is considered the maximum acceptable, what percent growth in message load can occur before the maximum is reached? (3)
(3) If 20% more utilization is experienced, will response time increase by more or less than 20%? (3)
(ii) Discuss the issues of fairness. Quality of Service and reservation in traffic management. (8)

13. (a) (i) Explain the various congestion control mechanisms followed in ATM networks. (8)
(ii) Discuss the ABR and GFR service categories in ATM networks. (8)
OR
(b) (i) Explain the Additive Increase Multiplicative Decrease behavior of TCP congestion control algorithm.(8)
(ii) Explain the basic TCP flow control mechanism in detail. (8)

14. (a) (i) Discuss the motivation and design goals of Random Early Detection scheduling policy.
(ii) Explain the Random Early Detection algorithm in terms of the estimation of queue size and determining packet discard.
OR
(b) (i) Describe the functional modules that should be present in ingress and egress routers of Differentiated Services Networks. (8)
(ii) Describe the components of a core router of Differentiated Services Network. (8)

15. (a) (i) Explain the soft state based receiver initiated reservation in RSVP. (8)
(ii) Discuss the flow specifications and filter specifications in RSVP. (8)
OR
(b) (i) Discuss the labeling and label switched path of MPLS networks. (8)
(ii) Explain the stacking rules followed in the label switched path of MPLS networks.(8)

Object Oriented Analysis and Design ND09 7th CS1402

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B.E/B.Tech.DEGREE EXAMINATION, NOVEMBER/DECEMBER 2009
Seventh Semester
Computer Science and Engineering
CS1402-OBJECT ORIENTED ANALYSIS AND DESIGN
(Common to B.E (Part-Time) Sixth Semester Regulation 2005)
(Regulation 2004)


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PART A- (10 x 2 =20 marks)

1. Give the characteristics of object oriented system.
2. What is an object? Give an example.
3. Give a note on patterns and its necessity.
4. Mention the models in Object Modelling Techniques in Rambaugh methodology and its role for describing the system.
5. List out the steps for finding the attributes of a class?
6. Give the hint to identify the attributes of a class?
7. Define axiom along with its types.
8. For the schema employee (emp-id, emp-name, street, city) give the class representation along with the attribute types.
9. Mention the purpose of view layer interface.
10. What are client/server computing? Give two applications which work on this basis?





PART B- (5 X 16 = 80 marks)

11. (a) Explain and develop the payroll system using the steps of Object oriented approach. [ Marks 16 ]
Or
(b) Explain the following
(i) Object Modeling Technique [ Marks 8 ]
(ii) Compare Aggregation and Composition with a suitable example. [ Marks 8]

12. (a) Explain the relationships that are possible among the classes in the UML representation with your example. [Marks 16 ]
Or
(b) What are the various diagrams that are used in analysis and design steps Of Booch Methodology? Explain with your own example. [Marks 16 ]

13. (a) Explain the method of identifying the classes using the common class approach with an example. [ Marks 16 ]
Or
(b) Consider the Hospital Management System application with the Following requirements
• System should handle the in-patient, out-patient information through receptionist.
• Doctors are allowed to view the patient history and give their prescription.
• There should be a information system to provide the required information.
Give the use case, class and object diagrams. [ Marks 4+8+4 ]

14.(a) With a suitable example explain how to design a class. Give all possible representation in a class (name, attribute, visibility, methods, responsibilities)[Marks 16 ]
OR
(b) Design the access layer for the Students information management which includes personal, fees and mark details. [ Marks 16 ]

15.(a) (i) Explain the various testing strategies. [ Marks 12 ]
(ii) Give the use cases that can be used to generate the test cases for the Bank ATM application. [ Marks 4]
or
(b) (i) How will you measure the user satisfaction? Describe. [ Marks 6 ]
(ii) Perform the satisfaction test for any client/server application. [ Marks 10]

Analog and Digital communications ND09 3rd CS2204

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B.E/B.Tech EXAMINATIONS,NOVEMBER/DECEMBER 2009
THIRD SEMESTER
COMPUTER SCIENCE AND ENGINEERING
CS 2204-ANALOG AND DIGITAL COMMUNICATIONS
(REGULATIONS 2008)


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PART A-(10X2=20 marks)

1.A carrier wave is represented by equation s(t)=12sinwt.Draw the wave form of an AM wave for depth of modulation of 0.5.
2.Compare FM with AM
3.What is coherent detection?
4.Why is binary ASK called on-off keying?
5.What are the errors in DM?
6.Define companding
7. What are the two methods of error detection and correction?
8.What do you mean by signaling rate?
9.Define processing gain
10.What is CDMA?

PART B-(5X16=80 marks)

11.(a)(i)The output voltage of a transmitter is given by 500(1+0.4sin3140t)cos6.28X10^7t
This voltage is fed to a load of 600 ohms.Determine
1.Carrier frequency
2.Modulating frequency
3.Carrier power (9)
(ii)Explain i detail about super heterodyne receiver(7)
Or
(b)(i)Carrier frequency modulated with a sinusoidal signal of 2kHz resulting in a maximum frequency deviation of 5kHz.Find
1.Modulating index
2.Bandwidth of modulated signal (4)
(ii)Explain the method of generating FM signal using indirect method(12)

12.(a)(i)Explain the coherent binary FSK system with a neat diagram of transmitter and receiver(12)
(ii)Enumerate the advantages and disadvantages of FSK over PSK system(4)
Or
(b)(i)Explain the generation and detection of coherent QPSK system in detail(12)
(ii)What is DPSK?Explain its bandwidth requirements.

13.(a)(i)Explain in detail about DPCM with suitable diagram(10)
(ii)1kHz signal is sampled by 8kHz sampling signal and the samples are encoded with 12 bit PCM system.Find
1.Required bandwidth for PCM system
2.Total number of bits in the digital output signal in 10 cycles(6)
Or
(b)(i)Write short notes on ISI(6)
(ii)What is eye pattern?Explain how is the performance of a base-band pulse transmission system measured with this?(10)

14(a)(i)Write short notes on error correcting codes
(ii)Find the generator polynomial of (7,4) cyclic code and find the codeword for the message 1001(12)
Or
(b)Explain in detail about the serial interface with its control signals and timing information(16)

15(a)(i)What are pseudo noise sequences?How are they generated?(6)
(ii)Explain direct sequence spread spectrum system in detail(10)
Or
(b)(i)Explain 2 types of FH spread spectrum systems with suitable diagrams(16)

Fundamental of computing and programming JF10 GE2112

B.E./B.TECH. DEGREE EXAMINATIONS, JANUARY 2010
REGULATIONS 2008
FIRST SEMESTER
COMMON TO ALL BRANCHES
GE2112 FUNDAMENTAL OF COMPUTING AND PROGRAMMING


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PART A-(10*2=20MARKS) 

1.Distinguish between Analog and Digital computer.
2.Convert 0.4375 decimal to binary system.
3.Distinguish between compiler and interpreters.
4.What is web server?
5.What is an algorithm?
6.Give the importance of a graphic packages.
7.Write a code segment using while statement to print numbers from 10 down to 1.
8.Write a c program for the following expressions.
(a)a=5 <= 8 && 6!=5
(b)a = b++ + ++b where b = 50
9.How strings are represented in c language?
10.What are the advantages of unions over structures?





PART B-(5*16=80 MARKS)

11.(a)(i)What are the characteristic of a computer? Discuss
(ii)Briefly explain the various generations of computers.
(iii)Convert the decimal number 59.8125 into binary and octal.
(OR)
11(b)Explain the different components of a computer system with block diagram.

12.(a)(i)Describe the different types of software with examples.
(ii)List the different software development steps and explain.
(OR)
12.(b)(i)Explain the common types of internet access.
(ii)Write short notes on web browser.
(iii)Explain a typical structure URL.

13. (a)Draw and explain the various symbols of flowchart and also draw the flowchar to add an array
of N elements
(OR)
13.(b)(i)Explain the features of Power Point package.
(ii)List and explain the features supported by spreadsheet package.
(iii)Briefly write about Desktop Publishing Software.

14.(a)(i)What are the different operators available in C? Explain with examples.
(ii)Differentiate between signed and unsigned integer.
(OR)
14.(b)(i)Explain the following conditional statements.
1.nested if-else statement
2.switch-case statement
(ii)Write a C program that reads a number and display whether the number is prime or not.

15.(a)(i)Write a C program to reverse a given string.
(ii)Differentiate pass by value and pass by address in c.
(OR)
15.(b)Write a C program that gets and display the report of n students with their personal
and academic details using structures.

Engineering Physics I - 1st JF10 PH2111

B.E./B.TECH. DEGREE EXAMINATION, JANUARY 2010
FIRST SEMESTER
PH 2111-ENGINEERING PHYSICS-I
(REGULATIONS 2008)


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PART A-(10*2=20MARKS)

1.What is cavitation?
2.What is sonogram?
3.What are different methods of achieving population inversion?
4.Distinguish between homo junction and hetero-junction semiconductor lasers.
5.A signal of 100 mW is injected into fiber. The out coming signal from the other end is 40 mW.
Find the loss in dB?
6.What is meant by splicing in fiber optics?
7.Calculate the equivalent wavelength of electrons moving with velocity of 3*10^7 m/s.
8.What is Compton effect?Write an expression for the Compton wavelength.
9.For a cubic crystal draw the planes with Miller indies(110) and(001).
10.What are Frenkly Schhottky imperfections?





PART-B--(5*16=80)MARKS

11.(a)(i)Explain how ultrasonic can be produced by using magnetostriction method.(12)
(ii)Write any four applications of ultrasonic waves (4)
(or)
(b)In ultrasonic NDT what are the three different scan displays in common use? Explain (10+6)

12.(a)For atomic transitions, derive Einstein relations and hence deduce the expression for the ratio of spontaneous emission rate to the stimulated emission rate.
(or)
(b)What is holography?Describe the construction and reconstruction methods of a hologram.(4+6+6)

13.(a)(i)How are fibers classified?Explain the classification in detail.(8)
(ii)Explain double crucible method of fiber manufacturing.(8)
(or)
(b)(i)Explain the construction and working of displacement and temperature fiber optic sensors (5+5)
(ii)Explain the construction and working of fiber-optic medical endoscope.(6)

14.(a)(i)Write a note on black body radiation.
(ii)Derive Planck's law radiation.
(or)
(b)(i)What is the principle of electron microscopy? Compare it wroth optical microscope. (4)
(ii)With schematic diagram explain the construction and working of scanning electron microscope. (12)

15.(a)(i)Explain the terms:atomic radius, coordination number and packing factor.(6)
(ii)Show that the packing factor for Face Centered Cubic and Hexagonal Closed Packed structures are equal . (10)
(or)
(b)(i)What are Miller in dices?Explain. (4)
(ii)Derive an expression for the inter planar spacing for(hkl) planes of a cubic structure.(10)
(iii)Calculate the inter planar for the spacing for(101) plane in a simple cubic crystal whose lattice constant is 0.42nm. (2)

Principles Of Communication ND09 IT2202

Anna University 2009
B.Tech Information Technology(IT)
IT 2202-Principles Of Communication
3rd Semester - Question Paper
Regulation 2008


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PART-A

1. Define amplitude modulation.
2. What is modulation index?
3. Why is ASK called as ON-OFF keying ?
4. What is the difference between QASK and QPSK ?
5. Define sampling rate.
6. What is ISI ?
7. Define Pseudo noise sequence.
8. What are the different types of multiple access techniques ?
9. Define Kepler's three laws of planetary motion.
10. What are the losses encountered by optical fiber ?






PART-B

11. (a) (i)Write short notes on
(1) AM voltage distribution. (4)
(2) AM power distribution. (4)
(ii) An audio frequency signal 10sin2p*500t is used to amplitude modulate a carrier of 50 sin2p*10^5t.Calculate.
(1) Modulation index. (2)
(2)Side band frequencies. (2)
(3)BW required. (2)
(4)Total power delivered to the load of 600O. (2)
(OR)
(b) (i)Compare FM and AM.(12)
(ii) The phase deviation constant in a phase modulation system is K=0.01rad/v.Calculate the maximum phase deviation when the modulating signal of 10V is applied. (4)

12. (a) (i)Explain the principle of FSK transmitter and receiver (10)
(ii)Write short note on spectrum and bandwidth of FSK. (6)
(OR)
(b) (i)Compare the various types of digital modulation techniques. (8)
(ii)Explain the eye pattern in base band digital transmission with neat diagram. (8)

13. (a) (i)Explain the elements of PCM system with a neat block diagram. (12)
(ii)What is companding ? (4)
(OR)
(b) (i)Find the signal amplitude for minimum quantization error in a delta modulation system if step size is 1 volt having repetition period 1 ms.The information signal operates at 100Hz. (4)
(ii) Describe the operations of DPCM system with relevant diagram. (12)

14. (a) (i)Write short notes on Frequency hop spread spectrum. (10)
(ii)Explain the applications of spread spectrum techniques. (6)
(OR)
(b) (i)Give a detailed account of multiple access techniques. (10)
(ii)Compare TDMA and CDMA. (6)

15. (a) (i)Discuss briefly the basic satellite communication system . (8)
(ii)Write short notes on LEO and GEO orbits. (8)
(OR)
(b) Enumerate the elements of an optical fiber transmission link. (16)