Categories
question bank

EC6403 Question Bank Electromagnetic Fields Regulation 2013 Anna University

EC6403 Question Bank Electromagnetic Fields Regulation 2013 Anna University

EC6403 Question Bank Electromagnetic Fields

EC6403 Question Bank Electromagnetic Fields Regulation 2013 Anna University free download. Electromagnetic Fields Question Bank free download.

Sample EC6403 Question Bank:

1. Define Divergence. (May 2010)

2. State Coulomb’s law. (Nov 2009/May 2008)

3. Define electric field intensity at a point. (Dec 2011)

4. What is an equipotential surface? (May 2011)

5. State Gauss’s Law.(May 2008)

6. State the applications of Gauss’s law. (May 2007)

7. State Divergence Theorem.(Dec2010/May 2009)

8.State Stoke Theorem. (April/may 2004, Nov/Dec 2007, 2009, April
2010).Give the meaning of Stoke’s theorem. (Nov 2014)

9. Explain the term irrotational and solenoidal as applied to vector F.(Dec 2004)

10. Given two points in Cartesian coordinate system as A (3,-2, 1),B (-3,-3,5).find distance from B to A. (Dec 2010)

11. Give the principles of superposition (Dec 2002,2004)

12. Mention any two sources of electromagnetic field.(May 2008)

13. A uniform surface charge of s=2 μc/m2 is situated at z=2 plane, what is the value of electric field intensity at P(1,1,1)?(June 2011)

14. Why Gauss’s law cannot be applied to determine the electric field due to finite line charge?(Dec 2008)

15. Define potential (May 2004, 2010)

16. State the principle of superposition as applied to an electric potential of a point.(May 2004,2005)

17. State the nature of conservative field.(May 2005,Nov 2005)

18. Give the relation between electric field and potential.(May 2007,Dec 2007)

19. Define volume charge density.(May/June 2006)

20. What is the physical significance of the term “divergence of a vector field”?(May/June 2006)

21. Name 3 coordinate systems used in electromagnetic engineering?

22. How to represent a point in a Cartesian system?

23. What is separation of vector?

24. State Distance formula?

25. What are differential elements in Cartesian system?

26. What are the differential elements in cylindrical system?

Subject Name Electromagnetic Fields
Subject Code EC6403
Regulation 2013

EC6403 Question Bank click here to download

Electromagnetic Fields syllabus click here

EC6403 notes click here

EC6403 important questions click here

Categories
Important question

EC6403 Important questions Electromagnetic Fields Regulation 2013 Anna University

EC6403 Important questions Electromagnetic Fields Regulation 2013 Anna University

EC6403 Important questions Electromagnetic Fields

EC6403 Important questions Electromagnetic Fields Regulation 2013 Anna University free download. Electromagnetic Fields Important questions free download.

Sample EC6403 Important questions:

1. Define scalar and vector field? Give its two examples.

2. Define base (unit) vector? What is its function while representing a function?

3. Define rectangle, cylindrical & spherical coordinates.

4. Define line, surface & volume charge density.

5. Define Curl, Divergence & Gradient with mathematical expression.

6. State Stroke‟s theorem & Write mathematical expression for Stroke‟s theorem.

7. State Divergence theorem & Write mathematical expression for Divergence theorem.

8. Convert the point P(3, 4, 5) from the cartesian to spherical coordinates. Prove that curl grad Φ = 0.

9. Determine the gradient of the scalar filed F = 5r2+r Sinθ. Show that vector H = 3y4z2ax+4x3z2ay+3x2y2az is solenoidal.

10. State Coulomb‟s law (or) State Coulomb‟s law in vector form. What are the features of Coulomb‟s law?

11. In XY plane, Q1=100 μC at (2,3)m, experiences a repulsive force of 7.5 N because of Q2 at (10,6)m. Find Q2.

12. State the principle of superposition of fields. A uniform surface charge of σ=2μc/m2 is situated at z=2 plane. What is the value of D at P(1,1,1)m.

13. Define electric field intensity. Mention any two sources of electromagnetic field.

14. State Gauss law. What is the use of Gauss‟s law?

15. State Divergence theorem. Show that .E=0 in the case of a point charge.

16. Define electric flux and electric flux density? Write relation between E & D.

17. Define potential. Distinguish potential & potential difference.

18. Define electric scalar potential. Write down relation between potential & electric field.

19. What is an electric dipole? Write down the potential due to an electric dipole.

20. State nature of conservative field. A point charge +2 nC is located at origin. What is the value of potential at P(1,0,0)m.

Subject Name Electromagnetic Fields
Subject Code EC6403
Regulation 2013

EC6403 Important questions click here to download

Electromagnetic Fields syllabus click here

EC6403 notes click here

Electromagnetic Fields question bank click here

Categories
r2013 notes

EC6403 Notes Electromagnetic Fields Regulation 2013 Anna University

EC6403 Notes Electromagnetic Fields Regulation 2013 Anna University

EC6403 Notes Electromagnetic Fields

EC6403 Notes Electromagnetic Fields Regulation 2013 Anna University free download. Electromagnetic Fields Notes free download.

OBJECTIVES EC6403 Notes:

To impart knowledge on the basics of static electric and magnetic field and the associated laws.

Give insight into the propagation of EM waves and also to introduce the methods in computational electromagnetics.

To make students have depth understanding of antennas, electronic devices, Wave guides is possible.

OUTCOMES Electromagnetic Fields Notes:

Upon completion of the course, the students would be able to

Analyze field potentials due to static changes and static magnetic fields.

Explain how materials affect electric and magnetic fields.

Analyze the relation between the fields under time varying situations.

Discuss the principles of propagation of uniform plane waves.

TEXT BOOKS EC6403 Notes:

1. William H Hayt and Jr John A Buck, “Engineering Electromagnetics” , Tata Mc Graw-Hill Publishing Company Ltd, New Delhi, 2008.

2. Sadiku MH, “Principles of Electromagnetics”, Oxford University Press Inc, New Delhi, 2009.

REFERENCES Electromagnetic Fields Notes:

1. David K Cheng, “Field and Wave Electromagnetics”, Pearson Education Inc, Delhi, 2004.

2. John D Kraus and Daniel A Fleisch, “Electromagnetics with Applications”, Mc Graw Hill Book Co, 2005.

3. Karl E Longman and Sava V Savov, “Fundamentals of Electromagnetics”, Prentice Hall of India, New Delhi, 2006.

4. Ashutosh Pramanic, “Electromagnetism”, Prentice Hall of India , New Delhi, 2006.

Subject Name Electromagnetic Fields
Subject Code EC6403
Regulation 2013

EC6403 Notes click here to download

Electromagnetic Fields syllabus click here

Electromagnetic Fields question bank click here

EC6403 important questions click here

Categories
UG syllabus R 2013

EC6403 syllabus Electromagnetic Fields Regulation 2013 Anna University

EC6403 syllabus Electromagnetic Fields Regulation 2013 Anna University

EC6403 syllabus Electromagnetic Fields

EC6403 syllabus Electromagnetic Fields Regulation 2013 Anna University free download. Electromagnetic Fields Syllabus free download.

UNIT I STATIC ELECTRIC FIELD EC6403 syllabus

Vector Algebra, Coordinate Systems, Vector differential operator, Gradient, Divergence, Curl, Divergence theorem, Stokes theorem, Coulombs law, Electric field intensity, Point, Line, Surface and Volume charge distributions, Electric flux density, Gauss law and its applications, Gauss divergence theorem, Absolute Electric potential, Potential difference, Calculation of potential differences for different configurations. Electric dipole, Electrostatic Energy and Energy density.

UNIT II CONDUCTORS AND DIELECTRICS Electromagnetic Fields syllabus

Conductors and dielectrics in Static Electric Field, Current and current density, Continuity equation, Polarization, Boundary conditions, Method of images, Resistance of a conductor, Capacitance, Parallel plate, Coaxial and Spherical capacitors, Boundary conditions for perfect dielectric materials, Poisson‟s equation, Laplace‟s equation, Solution of Laplace equation, Application of Poisson‟s and Laplace‟s equations.

UNIT III STATIC MAGNETIC FIELDS EC6403 syllabus

Biot -Savart Law, Magnetic field Intensity, Estimation of Magnetic field Intensity for straight and circular conductors, Ampere‟s Circuital Law, Point form of Ampere‟s Circuital Law, Stokes theorem, Magnetic flux and magnetic flux density, The Scalar and Vector Magnetic potentials, Derivation of Steady magnetic field Laws.

UNIT IV MAGNETIC FORCES AND MATERIALS Electromagnetic Fields syllabus

Force on a moving charge, Force on a differential current element, Force between current elements, Force and torque on a closed circuit, The nature of magnetic materials, Magnetization and permeability, Magnetic boundary conditions involving magnetic fields, The magnetic circuit, Potential energy and forces on magnetic materials, Inductance, Basic expressions for self and mutual inductances, Inductance evaluation for solenoid, toroid, coaxial cables and transmission lines, Energy stored in Magnetic fields.

UNIT V TIME VARYING FIELDS AND MAXWELL’S EQUATIONS EC6403 syllabus

Fundamental relations for Electrostatic and Magnetostatic fields, Faraday‟s law for Electromagnetic induction, Transformers, Motional Electromotive forces, Differential form of Maxwell‟s equations, Integral form of Maxwell‟s equations, Potential functions, Electromagnetic boundary conditions, Wave equations and their solutions, Poynting‟s theorem, Time harmonic fields, Electromagnetic Spectrum.

Subject Name Electromagnetic Fields
Subject Code EC6403
Regulation 2013

EC6403 syllabus click here to download

EC6403 notes click here

Electromagnetic Fields question bank click here

EC6403 important questions click here

 

Categories
UG syllabus R 2013

EC6402 Syllabus Communication Theory Regulation 2013 Anna University

EC6402 Syllabus Communication Theory Regulation 2013 Anna University

EC6402 Syllabus Communication Theory

EC6402 Syllabus Communication Theory Regulation 2013 Anna University free download. Communication Theory Syllabus free download.

UNIT I AMPLITUDE MODULATION EC6402 Syllabus

Generation and detection of AM wave-spectra-DSBSC, Hilbert Transform, Pre-envelope & complex envelope – SSB and VSB –comparison -Superheterodyne Receiver.

UNIT II ANGLE MODULATION Communication Theory Syllabus

Phase and frequency modulation-Narrow Band and Wind band FM – Spectrum – FM modulation and demodulation – FM Discriminator- PLL as FM Demodulator – Transmission bandwidth.

UNIT III RANDOM PROCESS Communication Theory Syllabus

Random variables, Central limit Theorem, Random Process, Stationary Processes, Mean, Correlation & Covariance functions, Power Spectral Density, Ergodic Processes, Gaussian Process, Transmission of a Random Process Through a LTI filter.

UNIT IV NOISE CHARACTERIZATION Communication Theory Syllabus

Noise sources and types – Noise figure and noise temperature – Noise in cascaded systems. Narrow band noise – PSD of in-phase and quadrature noise –Noise performance in AM systems – Noise performance in FM systems – Pre-emphasis and de-emphasis – Capture effect, threshold effect.

UNIT V INFORMATION THEORY EC6402 Syllabus

Entropy – Discrete Memoryless channels – Channel Capacity -Hartley – Shannon law – Source coding theorem – Huffman & Shannon – Fano codes.

Subject Name Communication Theory
Subject Code EC6402
Regulation 2013

EC6402 Syllabus click here to download

Communication Theory notes click here

EC6402 Important questions click here

Communication Theory Question Bank click here

Categories
question bank

EC6402 Question Bank Communication Theory Regulation 2013 Anna University

EC6402 Question Bank Communication Theory Regulation 2013 Anna University

EC6402 Question Bank Communication Theory

EC6402 Question Bank Communication Theory Regulation 2013 Anna University free download. Communication Theory Question Bank free download.

Sample Question Bank:

1. Compare AM, DSB-SC, SSB and VSB wave?

2. Define modulation index of AM signal..

3. Compare Frequency and Phase modulation.

4. Convert NBFM to WBFM?

5. Define noise figure.

6. Define Thermal noise.

7. Define Figure of merit.

8. Define pre-emphasis and de-emphasis

9. What is channel redundancy?

10. State Shannon‘s theorem

11. ((i) Explain Frequency Translation. (8)
(ii) Derive the equation of an AM wave. Also draw the modulated AM wave for various modulation index. (8)
OR
(b(i) Explain the generation of SSB signal. (10)
(ii) Show that an AM can be recovered, irrespective of value of % modulation by using synchronous detection technique. (6)

12 (a) (Draw the circuit diagram of Foster-Seeley discriminator and explain its working. (16)
OR
(b) (i) Explain the Armstrong method for generation of FM signal with block diagram. (10)
(ii) A modulating signal 5cos (2π15*1000t) angle modulates a carrier Acosωt. Find the modulation index & bandwidth for FM system & determine the change in bandwidth & modulation index for FM if fm is reduced by 5 KHz. (6)

13. (a) Derive the effective noise temperature of a cascade amplifier. Explain how the various noises are generated and the method of representing them. (16)
OR
(b) Discuss the following:
i) noise equivalent bandwidth (4)
ii) narrow band noise (4)
iii) noise temperature (4)
iv) noise spectral density (4)

14. (a) Explain the working of AM & FM Superheterodyne receivers with its parameters. (16)
OR
(b) Derive the expression for output signal to noise for a DSB-SC receiver using coherent detection. (16)

 

Subject Name Communication Theory
Subject Code EC6402
Regulation 2013

EC6402 Question Bank click here to download

EC6402 Syllabus click here

Communication Theory notes click here

EC6402 Important questions click here

 

Categories
Important question

EC6402 Important questions Communication Theory Regulation 2013 Anna University

EC6402 Important questions Communication Theory Regulation 2013 Anna University

EC6402 Important questions Communication Theory

EC6402 Important questions Communication Theory Regulation 2013 Anna University free download. Communication Theory Important questions free download.

Sample EC6402 Important questions:

1. What do you understand by narrowband FM?

When the modulation index is less than 1, the angle modulated systems are called low index. The bandwidth requirement of low index systems is approximately twice of the modulating.

2. Define frequency modulation.

Frequency modulation is defined as the process by which the frequency of the carrier wave is varied in accordance with the instantaneous amplitude of the modulating or message signal.

3. Define modulation index of frequency modulation.

It is defined as the ratio of maximum frequency deviation to the modulating
β = δ f f m

4. What do you meant by multitone modulation?

Modulation done for the message signal with more than one frequency component is called multitone modulation.

5. Define phase modulation.

Phase modulation is defined as the process of changing the phase of the carrier signal in
accordance with the instantaneous amplitude of the message signal.

6. What are the types of Frequency Modulation?

Based on the modulation index FM can be divided into types. They are Narrow band FM and Wide band FM. If the modulation index is greater than one then it is wide band FM and if the modulation index is less than one then it is Narrow band FM

7. What is the basic difference between an AM signal and a narrowband FM signal?

In the case of sinusoidal modulation, the basic difference between an AM signal and a narrowband FM signal is that the algebraic sign of the lower side frequency in the narrow band FM is reversed.

Subject Name Communication Theory
Subject Code EC6402
Regulation 2013

EC6402 Important Questions click here to download

EC6402 Syllabus click here

Communication Theory notes click here

Communication Theory Question Bank click here

Categories
r2013 notes

EC6402 Notes Communication Theory Regulation 2013 Anna University

EC6402 Notes Communication Theory Regulation 2013 Anna University

EC6402 Notes Communication Theory

EC6402 Notes Communication Theory Regulation 2013 Anna University free download. Communication Theory Notes free download.

OBJECTIVES EC6402 Notes:

Introduce the concepts of various analog modulations and their spectral characteristics.

To understand the properties of random process.

Know the effect of noise on communication systems.

To study the limits set by Information Theory.

OUTCOMES Communication Theory Notes:

At the end of the course, the students would.

Design AM communication systems.

Design Angle modulated communication systems.

Apply the concepts of Random Process to the design of Communication systems.

Analyze the noise performance of AM and FM systems.

TEXT BOOKS Communication Theory Notes:

1. J.G.Proakis, M.Salehi, “Fundamentals of Communication Systems”, Pearson Education 2006.

2. S. Haykin, “Digital Communications”, John Wiley, 2005.

REFERENCES Communication Theory Notes:

1. B.P.Lathi, “Modern Digital and Analog Communication Systems”, 3rd Edition, Oxford University Press, 2007.

2. B.Sklar, “Digital Communications Fundamentals and Applications”, 2nd Edition Pearson Education 2007.

3. H P Hsu, Schaum Outline Series – “Analog and Digital Communications” TMH 2006.

4. Couch.L., “Modern Communication Systems”, Pearson, 2001.

 

Subject Name Communication Theory
Subject Code EC6402
Regulation 2013

EC6402 Notes click here to download

EC6402 Syllabus click here

Communication Theory Important questions click here

Communication Theory Question Bank click here

Categories
question bank

EC6401 Question Bank Electronic Circuits 2 Regulation 2013 Anna University

EC6401 Question Bank Electronic Circuits 2 Regulation 2013 Anna University

EC6401 Question Bank Electronic Circuits 2

EC6401 Question Bank Electronic Circuits 2 Regulation 2013 Anna University free download. Electronic Circuits 2 Question Bank free download.

Sample EC6401 Question Bank:

1. What are the advantages and disadvantages of RC phase shift oscillators?[ APR/MAY 2008]

Advantages:

i. It is best suited for generating fixed frequency signals in the audio frequency range.
ii. It requires no transformer or inductor, hence less bulky.
iii. Simple Circuit.
*Pure sine wave output is possible.

Disadvantages:

i) It requires a high β transistor to overcome losses in the network.
ii) These oscillators are not suitable for high frequency operation.
iii) Frequency of oscillation can not be changed easily. To change the frequency of oscillation, the three capacitor or resistors should be changed simultaneously. This is inconvenient.

2. What is the necessary condition for a Wien bridge oscillator circuit to have sustained oscillations? [MAY/JUNE 2013]

Then for oscillations to occur in a Wien Bridge Oscillator circuit the following conditions must apply.

  • With no input signal the Wien Bridge Oscillator produces output oscillations.
  • The Wien Bridge Oscillator can produce a large range of frequencies.
  • Voltage gain of the amplifier must be at least 3.
  • The network can be used with a Non-inverting amplifier.
  • Input resistance of the amplifier must be high compared to R so that the RC network is not overloaded and alter the required conditions.
  • The output resistance of the amplifier must be low so that the effect of external loading is minimised.

3. Define piezoelectric effect.[MAY/JUNE 2006]

The piezo electric Crystals exhibit a property that if a mechanical stress is applied across one face the electric potential is developed across opposite face and viceversa. This phenomenon is called piezo electric effect.

4. What is the principle behind operation of a crystal oscillator?[NOV/DEC 2007]

The principle behind the operation of crystal is piezoelectric effect. According to this effect, if a mechanical stress is applied across one face the electric potential is developed across opposite face and viceversa.

Subject Name Electronic Circuits 2
Subject Code EC6401
Regulation 2013

EC6401 Question Bank click here to download

Electronic Circuits 2 Notes click here

EC6401 Syllabus click here

Electronic Circuits 2 important questions click here

 

Categories
Important question

EC6401 Important Questions Electronic Circuits 2 Regulation 2013 Anna University

EC6401 Important Questions Electronic Circuits 2 Regulation 2013 Anna University

EC6401 Important Questions Electronic Circuits 2

EC6401 Important Questions Electronic Circuits 2 Regulation 2013 Anna University free download. Electronic Circuits 2 Important Questions free download.

Sample EC6401 Important Questions:

1. List the four basic feedback topologies.

  • Current series feedback.
  • Current shunt feedback.
  • Voltage series feedback
  • Voltage shunt feedback

2. List the characteristics of an amplifier which are modified by negative feedback.

  • It reduces the gain of an amplifier
  • Increases the stability of an amplifier.
  • It increases the bandwidth
  • Decreases noise and distortion

3. What is Feedback Amplifier? & draw the diagram.

An amplifier with feedback network is known as feedback amplifier. With the help of feedback network, ‘a portion of the output signal is feedback to the input & combined with the input signal to produce the desired outputs’

4. What happens to the input resistance based on the type of feedback in an amplifier?[MAY/JUNE 2009]

If the feedback signal is added to the input in series with the applied voltage, it increases the input resistance.

If the feedback signal is added to the input in shunt with the applied voltage, it decreases the input resistance.

5. Why an LC tank circuit does not produce sustained oscillations. How can this can be overcome?[NOV/DEC 2008]

We know that the inductor coil has some resistance and dielectric material of the capacitor has some leakage.so small part of the originally imparted energy is used to overcome these losses. As a result, the amplitude of oscillating current goes on decreasing and becomes zero when all energy is
consumed as losses. So a LC tank circuit does not produce sustained oscillations. To maintain sustained oscillations, energy must be supplied to the circuit at the same rate at which it is dissipated. In an oscillator, the function of transistor and power supply source is to feed energy to the circuit to overcome the losses at right time.

 

Subject Name Electronic Circuits 2
Subject Code EC6401
Regulation 2013

EC6401 Important Questions click here to download

Electronic Circuits 2 Notes click here

EC6401 Syllabus click here

EC6401 Question Bank click here