Download MBBS VNSGU 3rd Year 2021 February RAN 3731 GENERAL SURGERY PAPER I Question Paper

Code: 13A05402

B.Tech II Year II Semester (R13) Regular Examinations May/June 2015

ELECTROMAGNETIC THEORY AND TRANSMISSION LINES

(Electronics and Communication Engineering)

Time: 3 hours Max. Marks: 70

--- Content provided by‌ FirstRanker.com ---

Answer all five units

UNIT – I

1. (a) State and explain Coulomb’s Law.
   (b) A charge Q_A = -20 µC is located at A(-6, 4, 7), and a charge Q_B = 50 µC is located at B(5, 8, -2) in free space. If distances are given in meters, find: (i) R_AB. (ii) The force exerted on Q_A by Q_B.
   (OR)
2. (a) Explain the concept of electric potential. Obtain the expression for potential due to a point charge.
   

   --- Content provided by⁠ FirstRanker.com ---

   (b) Determine the electric field intensity at P(-0.2, -3, 4) due to a point charge of 2nC at Q(0.2, 3, -1). All dimensions are in meters.

UNIT – II

1. (a) State and explain Ampere’s circuital law and write its applications.
   (b) A current sheet K = 10 a_y A/m is located at z = 2. (i) Find H at P(1, 1, 3). (ii) Find H at Q(0, -3, 10).
   (OR)
2. (a) Explain the concept of magnetic vector potential.
   

   --- Content provided by‌ FirstRanker.com ---

   (b) A conductor located at x = 0, y = 0 carries a current of 2A in the +z direction. Calculate the magnetic field intensity H at the point (1, 1, 0).

UNIT – III

1. (a) Derive Maxwell’s equations from Faraday’s and Ampere’s laws.
   (b) In a lossless dielectric medium for which ? = 300 ?, µ_r = 1, H = -0.5 cos (10⁸t - z) a_x A/m. Calculate e_r and E.
   (OR)
2. (a) Explain about instantaneous, average and complex Poynting vectors.
   

   --- Content provided by FirstRanker.com ---

   (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. Specify ß and H.

UNIT – IV

1. (a) Explain about reflection coefficient and transmission coefficient for normal incidence.
   (b) A plane wave in free space is normally incident on a large slab of material with e = 3.0 e₀ and µ = µ₀. Determine the fraction of the incident power that is reflected and transmitted.
   (OR)
2. (a) Explain about Brewster angle and critical angle.
   

   --- Content provided by‍ FirstRanker.com ---

   (b) A parallel polarized wave is incident from air onto a dielectric at the Brewster angle of 58°. Determine the relative permittivity of the dielectric.

UNIT – V

1. (a) Explain about primary and secondary constants of a transmission line.
   (b) A lossless transmission line with Z₀ = 50 ? is 30 m long and operates at 2 MHz. The line is terminated with a load Z_L = (60 + j40) ?. If v = 0.6c on the line, find: (i) Reflection coefficient G. (ii) Standing wave ratio s. (iii) Input impedance.
   (OR)
2. (a) Explain the applications of Smith chart.
   

   --- Content provided by​ FirstRanker.com ---

   (b) A lossless 50 ? transmission line is terminated in a load impedance Z_L = (25 + j50) ?. Use the Smith chart to find: (i) Voltage reflection coefficient. (ii) Voltage standing wave ratio. (iii) Input impedance at 0.3? from the load.

FirstRanker.com