AP DSC 2012 Results Declared

Andhra Pradesh Commissioner and Director of School Education (DSC) has published AP DSC Results...



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EE2202 ELECTROMAGNETIC THEORY ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER NOV/DEC 2010 For EEE DEPARTMENT ...

EE2202 ELECTROMAGNETIC THEORY ANNA UNIVERSITY PREVIOUS YEAR QUESTION PAPER NOV/DEC 2010 For EEE DEPARTMENT

Posted by R.Anirudhan

B.E./B.Tech. DEGREE EXAMINATION, NOVEMBER/DECEMBER 2010.

Third Semester

Electrical and Electronics Engineering

EE 2202 — ELECTROMAGNETIC THEORY

(Regulation 2008)

Time : Three hours Maximum : 100 Marks

Answer ALL questions

PART A — (10 × 2 = 20 Marks)

1. State divergence theorem.

2. Show that the vector z y x a y x a z x a z y H 2 2 2 3 2 4 3 4 3 + + = − − is solenoidal.

3. Define electric dipole and electric dipole moment.

4. Write Poisson’s equation and Laplace equation for a simple medium.

5. State Biot-Savrat’s law.

6. What is the expression for inductance of a toroid?

7. State Faraday’s law of electromagnetic induction.

8. State Maxwell’s I and II equation.

9. State the Poynting theorem.

10. Mention any two properties of uniform plane wave.

PART B — (5 × 16 = 80 Marks)

11. (a) Transform the vector − − − − − = z y x a a a A 4 2 4 at ( ) 4 , 3 , 2 = + = + = z y x p to

spherical coordinate.

Or

(b) Write short notes on the following :

(i) Gradient (4)

(ii) Divergence (4)

(iii) Curl and (4)

(iv) Stokes theorem. (4)

12. (a) Find the potential at any point along the axis of a uniformly charged disc

of 2 c/m σ . The disc has radius of ‘a’ m.

Or

(b) Deduce an expression for the capacitance of a parallel plate capacitor

having two dielectric media.

13. (a) (i) Obtain an expression for the magnetic field intensity due to finite

length current carrying conductor.

(ii) Find the magnetic field intensity at any point on the axis of a

circular coil carrying current with a loop radius of ‘a’ m.

Or

(b) State and explain Ampere’s circuital law and show that the field strength

at the end of a long solenoid is one half of that at the centre.

14. (a) Obtain the expression for energy stored in the magnetic field and also

derive the expression for magnetic energy density.

Or

(b) Derive and explain Maxwell’s equation in point and integral form using

Ampere’s circuital law and Faraday’s law.

15. (a) Derive the relationship between electric field and magnetic field. Derive

the wave equation for magnetic field in phasor form.

Or

(b) Define Brewster angle and derive its expression.

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IBPS PO Results 2012 Declare - IBPS MT Result,Score Card Available

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Posted by R.Anirudhan

B.E./B.Tech. DEGREE EXAMINATION, April/May 2011

Fifth Semester

Electronics and Communication Engineering

EC 2301 DIGITAL COMMUNICATION

(Regulation 2008)

Time : Three hours Maximum : 100 Marks

Answer ALL questions

PART A (10*2 = 20 Marks)

1.Give an example each for time limited and time unlimited signals.

2.Give an advantage and a disadvantage of digital communication.

3.State sampling theorem.

4.What is quantization error?

5.Define hamming distance.

6.What is mean by transparency with respect to line codes?

7.What is a matched filter?

8.Give two applications for eye pattern.

9.Draw the PSK waveform for 011011.

10.What is a non-coherent detection system?



PART B (5*16 = 80 Marks)



11(a)Explain how PWM and PPM signals are generated.

or

11(b)(i)Classify channels.Explain the mathematical model of any two communication channels.(6)

(ii)Explain Binary symmetric channel and Gaussian channel with

their mathematical models. (Marks 10)



12(a)(i)Explain a non-uniform quantization process.

(ii)Write notes on temporal waveform coding.

or

12(b)(i)Explain a spectral waveform encoding porcess.

(ii)Compare various speeches encoding methods.



(13)(a)(i)Assume a (2,1) convolutional coder with constraint length 6.Draw the tree diagram,state diagram and trellis diagram for the assumed coder.

(ii)Find the (7,4) linear systematic block code word corresponding to 1101.Assume a suitable generator matrix.

or

13(b)Draw the power spectra of polar codes and on-off codes.Discuss their characteristics.



14(a)Derive the expression for bit error probability due to a matched filter.

or

(b)Disucss on signal design for ISI elimination.



15(a)Derive the bit error probability due to coherent ASK,PSK and FSK systems.Compare the performance of these systems.

or

15(b)(i)Disucss QPSK signalling

(b)(ii)Derive the bit error probability due to QPSK receiver.Compare the performance of QPSK receiver with that of PSK receiver.

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