## Antennas and Wave Propagation EC2353 AM2015 6th Semester Question Paper

Anna University Question Paper Code :71463
B.E./B.Tech. DEGREE EXAMINATION, APRIIJMAY 2015.
Sixth Semester
Electronics and Communication Engineering
EC 2353/EC 63/10144 EC 604 - ANTENNAS AND WAVE PROPAGATION
(Regulation 2008/2010)
(Common to PTEC 2353 – Antennas and Wave Propagation for B.E. (Part-Time)
Fifth Semester – Electronics and Communication Engineering – Regulation 2009)

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PART A — (10 x 2= 20 marks)

1. Write the importance of radiation resistance of an antenna.
2.What is the significance of aperture of the antenna?
3.What are the applications of loop antenna?
4.Define Pattern Multiplication
5.State Huygen's Principle.
6.What are the features of pyramidal horn antenna?
7.What are the applications of microstrip antenna?
8. Differentiate near and far field.
9.Define optimum working frequency.
10. What is meant Faraday rotation?

PART B — (5 x 16 = 80 marks)

11. (a) Derive the Electric and magnetic field components of a Hertzian dipole.
Or
(b) (i) Two spacecrafts are separated by 3 Km. Each has an antenna with directivity D 200 operating at 2 GHz. If craft A's receives 20 db
power what is the transmitted power by craft B? (7)
(ii) Explain the following terms with respect to antenna:
(1) Polarization
(2) Effective aperture
(3) Directivity.(9)

12. (a) Derive the field quantities and draw radiation pattern for a half wavelength dipole.
Or
(b) Two identical radiators are spaced d = 3V4 meters apart and fed with currents of equal magnitude but with 1800 phase difference. Evaluate the resultant radiation identify the direction of maximum and minimum radiation.

13. (a) Explain the radiation mechanism of horn antenna with diagram. Draw the different types of horn structures.
Or
(b) Explain the principle of Reflector antenna and discuss on different types of feed used with neat. diagram.

14. (a) What are the importance of Helical antenna? Explain the construction and operation of Helical antenna with neat sketch.
Or
(b) explain the principle of operation of Log periodic antenna with neat schematic diagram.

15. (a) (1)Draw the structure of ionosphere and explain the mechanism of ionosphere propagation.(10)
(ii) Explain the effects of magnetic fields on EM wave propagation. (6)
Or
(b) (i)Explain the terms:
(1) MUF
(2) Virtual height
(3) Duct propagation
(4) Skip distance
(ii) Explain the mechanism of tropospheric propagation.(6)

## EC2202 MJ2014 DS and OOPs 3rd Semester Question Paper - Reg2008

Anna University
Question Paper Code : 51394
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Third Semester
Electronics and Communication Engineering
EC 2202/EC 33/080290009/10144 EC 303 DATA STRUCTURES AND OBJECT - ORIENTED PROGRAMMING IN C++
(Regulation 2008/2010)

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PART A — (10 x 2 = 20 marks)

1. How to create symbolic constants in C++?
2. Define destructor with syntax.
3. List out Various forms of inheritance.
4. Write syntax for re-throwing an exception.
5. Convert the given notation from infix to postfix.
6. Define hashing.
7. How to calculate shortest paths in unweighed graph?
8. What is NP completeness?
9. What is K-way merge?
10. Write the template for depth-first search.

PART B — (5 x 16 = 80 marks)

11. (a) (i) Explain call•by reference and return.by reference with syn6.x: (8)
(ii) Brief about manipulation of strings using operators. (8)
Or
(b) (i) Explain with syntax .multiple constructors in a class. (8)
(ii) What is Constructor with default Arguments? (8)

## EC2201 MJ2014 Electrical Engineering 3rd Semester Question Paper - Reg2008

Anna University
Question Paper Code :51393
B.E./B.Tech - DEGREE EXAMINATION, MAY/JUNE 2014.
Third Semester
Electronics and Communication Engineering
EC 2201/EC 32/EE 1204/080290008/10144 EC 302 — ELECTRICAL ENGINEERING
(Regulation 2008/2010)

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PART A (10 x 2 = 29 marks)

1. Write the necessary conditions to be satisfied for the self excited DC generator to build up emf.
2. Give the reason for high starting current in a DC motor.,
3. List out any four general application of Transformers.
4. Define voltage regulation of a Transformer.
5. Distinguish between squirrel cage and slip-ring induction motor.
6. Name any four types of single phase induction motors based on method of starting.
7. Find the speed at 'which a 6-pole Alternator is to be driven to obtain the. Frequency of emf induced to be 50 Hz.
8. On what factors does the back emf induced on windings of Brushless DC motor . depends?.
9. State the advantages and limitation of high transmission voltage.
10. Write the desirable properties of transmission line insulators.

PART B — (5 x 16 = 80 marks)

11. (a) (i) Briefly explain the load characteristics of different types of compound generators. (8)
Explain of speed control of DC series motor applying flux control technique. (8)
Or.
(b) (i) Derive from the first principle an expression for the torque developed in a motor. (8)
A 400 V DC shunt motor takes 5 A on no-load at its rated speed. The armature resistance including that of brushes is 0.2 n and the normal field current is 2 A. Determine the efficiency of the machine., as generator delivering load current of 30 A. (8)

## EC2203 MJ2014 Digital Electronics 3rd Semester Question Paper - Reg2008

Anna University
Question Paper Code :51395
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Third Semester
Electronics and Communication Engineering
EC 2203/EC 34/080290010/10144 EC 304 — DIGITAL ELECTRONICS
(Regulation 2008/2010)
(Common to PTEC 2203 Digital Electronics for B.E. (Part-Time) Third Semester –Electronics and Communication Engineering Regulation 2009)

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PART A — (10 x 2 = 20 marks}

1. Apply De-Morgan's theorem to [(A + B) + C]
2. Convert 0.35 to equivalent hexadecimal number.
3. Draw the logic, circuit of a 2 bitcomparator.
4. What is priority encoder?
5. Compare the logics of synchronous counter and ripple counter.
6. Sketch the logic 'diagram of a clocked SR flip flop.
7. Draw the structure of a static RAM cell.
8. List the advantages of PLDs.
9. What is a state diagram? Give an example.
10. Write the VHDL code for a half adder.

## EC2204 MJ2014 Signal and System 3rd Semester Question Paper - Reg2008

Anna University
B.E./B.Tech. DEGREE EXAMINATION, MAY / JUNE 2014
Third Semester
Electronics and Communication Engineering
EC2204 - SIGNALS AND SYSTEMS
(Regulation 2008)

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## EC2205 MJ2014 Electonics Circuits I 3rd Semester Question Paper - Reg2008

Anna University
Question Paper Code : 5.1397
B.E/B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Third Semester
Electronics and Communication Engineering
EC 2205/EC 36/080290011— ELECTRONIC CIRCUITS
(Common to Medical Electronics Engineering)
(Regulation 2008)

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PART-A — (10 x 2 = 20 marks)

1. What do you mean by punch through?
2. What is thermal runaway?
3. What is Darling-ton connection?
4. Write about the characteristics of common emitter amplifier
5: What do you mean by rise time?
6. State miller's theorem.
7. What do you mean by harmonics?
8. What is conversion efficiency?
9. Draw the basic building block of linear mode power supply.
10. What is CLC filter?

PART B — (5 x 16= 80 marks)

11. (a) (i) Briefly describe about any two bia's compensation techniques of BJT (6)
(ii) With neat circuit diagram and needed expressions, explain, the working principle of self bias of Transistor.(10)
Or
(b) (i) What is stability? What is the need for load line and quiescent point calculation? . . (6)
(ii) Calculate the operating point of the self biased JFET haying the supply Voltage VDD =' 20V, maximum value of drain current IDSS = 10mA and VGS = –3V at ID= 4mA. Also. determine the values of resistors RD and Rs to obtain-the bias condition. (10)

## EC2252 MJ2014 Communication Theory 4th Semester Question Paper - Reg2008

Anna University
Question Paper Code :51399
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Fourth Semester
Electronics and Communication Engineering
EC 2252/EC 42/EC 1252/080290020 -- COMMUNICATION THEORY
(Regulation 2008)
(Common to PTEC 2252 Communication Theory for B.E. (Part-Time) Third Semester ECE – Regulation 2009)

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PART A — (10 X, 2 = 20 marks)

1. State the differences between single side band and vestigial side band transmission systems.
2. For an AM system, the instantaneous values of carrier and modulating signal. are 60 sin wct and 40 sin wnt respectively. Determine the modulation index.
3. Define white noise.
4. If the maximum phase deviation in a phase modulation the when a modulating signal of 10 V is applied is 0.1 radian, determine the value of phase deviation constant.
5. State the Shannon's theorem.
6. State the need for pre-emphasis and de-emphasis circuits in the field of communication.
7. Derive an equation for the modulated signal of an AM system.
8. Why is frequency modulation preferable for voice transmission?
9. Define noise figure.
10. Define the sensitivity characteristics of a radio receiver.

## EC2301 MJ2014 Digital Communication 5th Semester Question Papers - Reg2008

Anna University
Question Paper Code 51403
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Fifth Semester.
Electronics and Communication Engineering
EC 2301/EC 51 DIGITAL COMMUNICATION
(Regulation 2008)
(Common to PTEC 2301 – Digital Communication for B.E. (Part-Time) Fourth Semester Electronics and Communication Engineering Regulation 2009)

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PART A — (10 x 2 = 20 marks)

1. Classify communication channels.
2. State the demerit of digital communication.
3. What is the need for non uniform quantization?
4. . List any four speech encoding procedures.
5. Define hamming distance and hamming weight.
6. What are the requirements of a line code?
7. What is ISI?
8. What is a matched filter?
9. What are the advantages of QPSK over PSK?
10. Draw the signal space diagram for QAM signal for M = 8.

## EC2304 MJ2014 Microprocessor And Microcontrollers 5th Semester Question Paper - Reg2008

Anna University
Question Paper Code :51406
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Fifth Semester
Electronics and Communication. Engineering
EC 2304/EC 54 — MICROPROCESSORS AND MICROCONTROLLERS
(Regulation 2008)
(Common to ?TEC 2304 — Microprocessors and Micro controllers for B.E. (Part-Time) 'Fifth Semester Electronics and Communication Engineering —Regulation 2009)

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PART A — (10 x 2 = 20. mark)

1. State the different data transfer schemes.
2. What are the advantages of memory-mapped I/O over I/O-mapped I/O?
3. List the flags in 8086 and state its functions.
4. Identify the addressing modes in the following.instructions. AND AL, EL SUB AL, 24H - MOV AL, (B13) moy CX, 1245H.
5. What is key debouncing? What are the methods to detect the debouncing?
6. State the signals that govern the operation of the printer.
7. How does the processor 8051 knows whether on-chip ROM or external program memory is used?
8. -What is the difference between AJMP and LJMP instruction?
9. Write about the design steps involved in using microcontroller for Stepper motor.
10. State the significance of using microprocessors in interfacing traffic limit control.

## EC2302 MJ2014 DSP 5th Semester Question Paper - Reg2008

Anna University
Question Paper Code : 51404
B.E./B.Tech. DEGREE EXAMINATION, MAY/JUNE 2014.
Fifth Semester
Electronics and Communication Engineering
EC 2302/EC 52 — DIGITAL SIGNAL PROCESSING
(Regulation .2008)
(Common to PTEC 2302 –Digital Signal Processing for B.E. (Part-Time) Fourth Sethester, Electronics and Communication Engineering – Regulation 2009)

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PART A (10 X 2 = 20 marks

1. State the difference•between DFT and DTFT.
2. What is Bit Reversal?
3. Sketch the frequency response of an odd and an even order Chebyshev low pass filters.
4. What is bilinear transformation?
5. What is the main. advantages and disadvantages of this technique? State the effect of having abrupt discontinuity in frequency response of FIR
filters.
6. State Gibb's phenomenon
7. State the need for "scaling in filter implementation.
8. What is product round-off noise?
9. Write the need for. decimation.
10. What is meant by multirate signal processing?

PART B 7- (5.x 16 = 80 marks)

11. (a) Explain in detail about overlap add method and overlap save method for filtering of long data sequences using DFT. _ (16) Or