Download AKTU B-Tech 8th Sem 2015-16 EME 801 Power Plant Engineering Question Paper

Code: 13A05302

R13

JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

B. Tech II Year I Semester Examinations, November/December - 2016

ELECTROMAGNETIC THEORY AND TRANSMISSION LINES

(Electronics and Communication Engineering)

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Time: 3 Hours Max. Marks: 75

Note: This question paper contains two parts A and B.

Part A is compulsory which carries 25 marks. Answer all questions in Part A. Part B consists of 5 Units. Answer any one full question from each unit. Each question carries 10 marks.

PART – A (25 Marks)

1. 1. State Coulomb's Law. (2 Marks)
   2. Define Electric Potential. (3 Marks)

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   3. State Ampere's Circuital Law. (2 Marks)
   4. Define Magnetic Dipole Moment. (3 Marks)
   5. Write Maxwell's equation in integral form. (2 Marks)
   6. Define Loss tangent. (3 Marks)
   7. Define Intrinsic Impedance. (2 Marks)

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   8. Define Skin depth. (3 Marks)
   9. Define Reflection Coefficient. (2 Marks)
   10. What are the applications of Smith chart? (3 Marks)

PART – B (50 Marks)

1. (a) Derive the expression for electric field due to a uniformly charged line.

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   (b) A point charge of 10 nC is located at P(0, 0, 3) m. Find the potential at Q(2, 0, 5) m.

   OR

   2. (a) Using Gauss's law, derive the expression for electric field intensity due to an infinite sheet of charge.
   (b) Given the potential V = 10 sin ? cos f / r², find the electric flux density at (2, p/2, 0).

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2. 3. (a) Derive the expression for magnetic field intensity on the axis of a circular loop carrying current I.

   (b) A long straight wire carries a current of 5 A along the z-axis. Calculate the magnetic field intensity in Cartesian coordinates at point P(2, 3, 0).

   OR

   4. (a) State and explain Biot-Savart's Law.
   (b) Determine the force per meter length between two parallel wires carrying currents of 10 A and 20 A in the same direction, separated by a distance of 5 cm.

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3. 5. (a) Derive Maxwell's equations in both point and integral form.

   (b) Explain the concept of displacement current.

   OR

   6. Discuss about the comparison between circuit theory and field theory.

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4. 7. (a) Explain about the wave propagation in good conductors.

   (b) A plane wave propagating through a medium with e_r = 8, µ_r = 2 has E = 0.5 sin(10⁸t - ßz) a_x V/m. Determine:

   1. ß
   2. The loss tangent

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   3. Wave impedance
   4. H

   OR

   8. (a) Derive the expression for the attenuation constant and phase constant for electromagnetic wave propagation in a conducting medium.
   (b) Define and explain Poynting theorem.

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5. 9. (a) Derive the expression for reflection coefficient and transmission coefficient when a wave is incident normally on a dielectric-dielectric boundary.

   (b) A 50 O lossless transmission line is terminated in a load impedance of (30 + j40) O. Calculate reflection coefficient and SWR.

   OR

   10. Explain about Single stub matching with suitable diagrams.

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